:root {
    /* UPBoardBook day theme — https://upboardbook.com/upb_v2/public/ */
    color-scheme: light;
    --paper: #f3f6fb;
    --ink: #12233f;
    --heading: #0b2244;
    --navy: #0b2244;
    --navy-dark: #07101c;
    --muted: #3a4d63;
    --line: #c5d0e0;
    --brand: #0b2244;
    --brand-bright: #1a73e8;
    --brand-bright-hover: #1558c0;
    --link: #0b57d0;
    --link-hover: #0842a0;
    --mark: #c4451c;
    --mark-fill: #c4451c;
    --white: #ffffff;
    --on-accent: #ffffff;
    --pass: #0a6e62;
    --pass-fill: #0a6e62;
    --pass-dark: #08574e;
    --pass-bg: #e7f7f4;
    --fail-bg: #fff0eb;
    --hover: #eaf2ff;
    --hover-border: #9ec2f5;
    --hero-1: #f7fbff;
    --hero-2: #eef4ff;
    --lilac: #f1edff;
    --lilac-border: #d4c9f0;
    --card-bg: #ffffff;
    --card-border: #d9e2ee;
    --header: #0b2244;
    --header-ink: #0b2244;
    --header-bg: rgb(255 255 255 / 0.94);
    --header-border: #e4eaf3;
    --cta-bg: #0b2244;
    --footer-bg: #0b2244;
    --footer-text: #f3f6fb;
    --footer-link: #ffffff;
    --footer-copy: #d7e2f0;
    --footer-social-bg: #1a73e8;
    --site-gutter: 1rem;
    --content-gutter: 2rem;
    --flash-bg: #fff6ee;
    --flash-line: #c48a12;
    --flash-ink: #6b4500;
    --gold-text: #6b4500;
    --neutral-bar: #dce3ef;
    --neutral-muted: #3a4d63;
    --neutral-border: #b7c4d6;
    --tap: 48px;
    --radius-lg: 1.375rem;
    --radius-md: 0.875rem;
    --shadow-sm: 0 8px 24px rgb(11 34 68 / 0.06);
    --shadow: 0 18px 50px rgb(11 34 68 / 0.08);
    --ub-navy: #0b2244;
    --ub-ink: #12233f;
    --ub-blue: #1a73e8;
    --ub-teal: #0a6e62;
    --ub-muted: #3a4d63;
    --ub-line: #c5d0e0;
    --ub-bg: #f3f6fb;
    --ub-white: #ffffff;
    --ub-card: #ffffff;
    --ub-nav-bg: rgb(255 255 255 / 0.94);
    --ub-sky: #eaf2ff;
    --ub-cta-bg: #0b2244;
    --ub-footer-bg: #0b2244;
    --ub-footer-text: #f3f6fb;
    --ub-footer-heading: #ffffff;
    --ub-footer-link: #ffffff;
    --ub-footer-social-bg: #1a73e8;
    --ub-shadow: 0 18px 50px rgb(11 34 68 / 0.08);
    --class-box-bg: #0b2244;
    --class-box-ink: #ffffff;
    --class-box-border: #0b2244;
    --class-box-hover-bg: #123056;
    --class-box-hover-border: #123056;
    --class-box-on-bg: #0842a0;
    --class-box-on-border: #ffffff;
    --class-box-on-ink: #ffffff;
    --subject-mock-bg: linear-gradient(135deg, #0b2244 0%, #1558c0 58%, #1a73e8 100%);
    --subject-mock-bg-hover: linear-gradient(135deg, #123056 0%, #1a73e8 62%, #3d8bff 100%);
    --subject-mock-ink: #ffffff;
    --subject-mock-muted: #d7e2f0;
    --subject-mock-border: #1558c0;
    --subject-mock-chip-bg: rgb(255 255 255 / 0.14);
    --subject-mock-chip-line: rgb(255 255 255 / 0.3);
    --tone-accent: #1a73e8;
    --tone-tint: #eef5ff;
    --tone-tint-hover: #e3eeff;
    --tone-line: #c5daf8;
    --start-bg: #ea580c;
    --start-hover: #c2410c;
    --start-shadow: 0 6px 14px rgb(234 88 12 / 0.35);
}

html[data-ub-theme="night"] {
    color-scheme: dark;
    --paper: #0b1220;
    --ink: #eaf0fa;
    --heading: #ffffff;
    --navy: #eaf0fa;
    --navy-dark: #07101c;
    --muted: #b8c7dc;
    --line: #4a6280;
    --brand: #7db3ff;
    --brand-bright: #7db3ff;
    --brand-bright-hover: #9cc4ff;
    --link: #8ab4ff;
    --link-hover: #c2d6ff;
    --mark: #ffb199;
    --mark-fill: #c4451c;
    --pass: #4ad4c0;
    --pass-fill: #0a6e62;
    --pass-dark: #08574e;
    --pass-bg: #12332e;
    --fail-bg: #3a2018;
    --hover: #1a2d4a;
    --hover-border: #7db3ff;
    --hero-1: #0e1829;
    --hero-2: #102038;
    --lilac: #241e3a;
    --lilac-border: #4c3d78;
    --card-bg: #121c2e;
    --card-border: #3a5068;
    --header: #ffffff;
    --header-ink: #eaf0fa;
    --header-bg: rgb(11 18 32 / 0.94);
    --header-border: #2c3f5c;
    --cta-bg: #1a73e8;
    --footer-bg: #07101c;
    --footer-text: #e8eef8;
    --footer-link: #d5e4ff;
    --footer-copy: #c5d4ea;
    --footer-social-bg: #1560c4;
    --flash-bg: #2d2418;
    --flash-line: #f5b942;
    --flash-ink: #ffe08a;
    --gold-text: #ffe08a;
    --neutral-bar: #24364f;
    --neutral-muted: #b8c7dc;
    --neutral-border: #4a6280;
    --shadow-sm: 0 8px 24px rgb(0 0 0 / 0.28);
    --shadow: 0 18px 50px rgb(0 0 0 / 0.4);
    --ub-navy: #eaf0fa;
    --ub-ink: #f4f7fc;
    --ub-blue: #7db3ff;
    --ub-teal: #4ad4c0;
    --ub-muted: #b8c7dc;
    --ub-line: #4a6280;
    --ub-bg: #0b1220;
    --ub-white: #121c2e;
    --ub-card: #121c2e;
    --ub-nav-bg: rgb(11 18 32 / 0.94);
    --ub-sky: #1a2d4a;
    --ub-cta-bg: #1a73e8;
    --ub-footer-bg: #07101c;
    --ub-footer-text: #e8eef8;
    --ub-footer-heading: #ffffff;
    --ub-footer-link: #d5e4ff;
    --ub-footer-social-bg: #1560c4;
    --ub-shadow: 0 18px 50px rgb(0 0 0 / 0.4);
    --class-box-bg: #7db3ff;
    --class-box-ink: #07101c;
    --class-box-border: #9cc4ff;
    --class-box-hover-bg: #9cc4ff;
    --class-box-hover-border: #c2d6ff;
    --class-box-on-bg: #c2d6ff;
    --class-box-on-border: #eaf0fa;
    --class-box-on-ink: #07101c;
    --subject-mock-bg: linear-gradient(135deg, #0e3a78 0%, #1560c4 55%, #4ad4c0 140%);
    --subject-mock-bg-hover: linear-gradient(135deg, #1558c0 0%, #1a73e8 60%, #4ad4c0 140%);
    --subject-mock-ink: #ffffff;
    --subject-mock-muted: #d7e2f0;
    --subject-mock-border: #7db3ff;
    --subject-mock-chip-bg: rgb(255 255 255 / 0.12);
    --subject-mock-chip-line: rgb(255 255 255 / 0.28);
    --tone-accent: #3d8bff;
    --tone-tint: #15263d;
    --tone-tint-hover: #1b3252;
    --tone-line: #3d5a82;
    --start-bg: #ea580c;
    --start-hover: #fb923c;
    --start-shadow: 0 6px 14px rgb(251 146 60 / 0.4);
}

* { box-sizing: border-box; }
html {
    scroll-behavior: smooth;
    font-size: 100%;
    background: var(--paper);
}
body {
    margin: 0;
    min-height: 100vh;
    font-family: "Plus Jakarta Sans", "Noto Sans Devanagari", system-ui, "Segoe UI", sans-serif;
    background: var(--paper);
    color: var(--ink);
    -webkit-font-smoothing: antialiased;
}
body.ub-nav-open,
body.modal-open {
    overflow: hidden;
}
a { color: inherit; text-decoration: none; }
.link,
.login-back {
    color: var(--link);
    text-underline-offset: 0.18em;
}
.link:hover,
.login-back:hover {
    color: var(--link-hover);
    text-decoration: underline;
}
button, input, select { font: inherit; }
:focus-visible {
    outline: 3px solid var(--brand-bright);
    outline-offset: 2px;
}
h1, h2, h3, p, dl, dd, dt, ul { margin: 0; }
h1, h2, h3 { color: var(--heading); }
input[type="radio"],
input[type="checkbox"] { accent-color: var(--brand-bright); }

.site { min-height: 100vh; display: flex; flex-direction: column; background: var(--paper); }
.wrap { width: min(1152px, calc(100% - (var(--site-gutter) * 2))); margin-inline: auto; }
.wrap-narrow { width: min(768px, calc(100% - (var(--site-gutter) * 2))); margin-inline: auto; }
.dashboard-band .wrap,
.main .wrap {
    width: min(1152px, calc(100% - (var(--content-gutter) * 2)));
}
.main .wrap-narrow {
    width: min(768px, calc(100% - (var(--content-gutter) * 2)));
}
.main { flex: 1; background: var(--paper); }
.page { padding: 1.25rem 0; }

.ub-skip {
    position: absolute;
    left: -999px;
    top: 0;
    background: var(--cta-bg);
    color: var(--on-accent);
    padding: 8px 12px;
    z-index: 100;
}
.ub-skip:focus { left: 12px; top: 12px; }
.ub-nav {
    position: sticky;
    top: 0;
    z-index: 50;
    width: 100%;
    background: var(--ub-nav-bg);
    border-bottom: 1px solid var(--ub-line);
    color: var(--ub-navy);
    backdrop-filter: blur(12px);
    padding-top: env(safe-area-inset-top, 0);
}
.ub-nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    min-height: 64px;
    width: 100%;
    padding: 0 20px;
    flex-wrap: nowrap;
}
.ub-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none !important;
    color: var(--ub-navy) !important;
    font-weight: 800;
    font-size: 1rem;
    letter-spacing: -0.03em;
    flex-shrink: 0;
}
.ub-brand img {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    object-fit: contain;
    background: var(--ub-card);
}
.ub-nav-links {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    justify-content: flex-end;
    gap: 0;
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1 1 auto;
    min-width: 0;
}
.ub-nav-links li { flex-shrink: 0; }
.ub-nav-links a {
    display: flex;
    align-items: center;
    min-height: 40px;
    padding: 8px 10px;
    border-radius: 999px;
    text-decoration: none !important;
    color: var(--ub-muted) !important;
    font-size: 0.88rem;
    font-weight: 700;
    white-space: nowrap;
}
.ub-nav-links a:hover,
.ub-nav-links a.is-active {
    background: var(--ub-sky);
    color: var(--ub-blue) !important;
}
.ub-nav-cta,
.ub-nav-login {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: var(--tap);
    padding: 8px 16px;
    background: var(--ub-cta-bg);
    color: var(--on-accent) !important;
    text-decoration: none !important;
    font-weight: 700;
    font-size: 0.9rem;
    border: 0;
    border-radius: 999px;
    white-space: nowrap;
    flex-shrink: 0;
    cursor: pointer;
    box-shadow: 0 8px 20px rgb(11 34 68 / 0.22);
}
.ub-nav-cta:hover,
.ub-nav-login:hover {
    filter: brightness(1.08);
    color: var(--on-accent) !important;
    text-decoration: none !important;
}
.ub-play-badge {
    display: inline-flex;
    align-items: center;
    line-height: 0;
    flex-shrink: 0;
    background: transparent !important;
    box-shadow: none;
    border-radius: 0;
    padding: 0;
    min-height: 0;
    color: inherit !important;
}
.ub-play-badge img {
    display: block;
    height: 40px;
    width: auto;
    transition: transform 0.15s ease, filter 0.15s ease;
}
.ub-play-badge:hover,
.ub-play-badge:focus-visible {
    background: transparent !important;
    filter: none;
}
.ub-play-badge:hover img,
.ub-play-badge:focus-visible img {
    transform: translateY(-1px);
    filter: drop-shadow(0 6px 12px rgb(11 34 68 / 0.18));
}
.ub-nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}
.ub-theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: var(--tap);
    min-width: var(--tap);
    border: 2px solid var(--ub-line);
    background: var(--ub-card);
    color: var(--ub-navy);
    font-family: inherit;
    font-size: 0.88rem;
    font-weight: 800;
    padding: 8px 14px;
    border-radius: 999px;
    cursor: pointer;
    white-space: nowrap;
}
.ub-theme-toggle:hover {
    border-color: var(--ub-blue);
    background: var(--ub-sky);
    color: var(--ub-blue);
}
.ub-theme-ico::before {
    content: "☾";
    font-size: 1.05rem;
    line-height: 1;
}
html[data-ub-theme="night"] .ub-theme-ico::before { content: "☀"; }
.ub-nav-toggle {
    display: none;
    place-items: center;
    flex-shrink: 0;
    border: 2px solid var(--ub-line);
    background: var(--ub-card);
    width: var(--tap);
    height: var(--tap);
    min-width: var(--tap);
    min-height: var(--tap);
    border-radius: 12px;
    cursor: pointer;
    color: var(--ub-navy);
}
.ub-burger,
.ub-burger::before,
.ub-burger::after {
    display: block;
    width: 18px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
}
.ub-burger { position: relative; }
.ub-burger::before,
.ub-burger::after {
    content: "";
    position: absolute;
    left: 0;
}
.ub-burger::before { top: -6px; }
.ub-burger::after { top: 6px; }
.ub-nav-mobile-item { display: none; }
.mobile-bottom-nav { display: none; }
.ub-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    width: fit-content;
    background: var(--card-bg);
    border: 1px solid var(--line);
    color: var(--pass);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 6px 12px;
    border-radius: 999px;
    margin: 0 0 12px;
}
.ub-kicker span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--pass-fill);
    box-shadow: 0 0 0 4px rgb(10 110 98 / 0.16);
}
.hero-title {
    font-size: clamp(1.55rem, 3.4vw, 2.35rem);
    line-height: 1.18;
    letter-spacing: -0.04em;
    color: var(--heading);
    font-weight: 800;
    margin: 0 0 8px;
}
.hero-lead { max-width: 42rem; margin-bottom: 1rem; }
.seo-band {
    border-top: 1px solid var(--line);
    background: var(--paper);
    padding: 1.5rem 0 2.25rem;
}
.seo-copy {
    max-width: none;
}
.seo-copy .section-title {
    margin-top: 2rem;
    margin-bottom: 0.35rem;
}
.seo-copy .section-title:first-child {
    margin-top: 0;
}
.seo-copy p,
.seo-copy li {
    margin-top: 0.5rem;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--muted);
    max-width: none;
}
.seo-subject-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin: 0 0 1.35rem;
    padding: 0;
    list-style: none;
}
.seo-subject-pills li {
    margin: 0;
    padding: 0.3rem 0.75rem;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: var(--card-bg);
    color: var(--navy);
    font-size: 0.82rem;
    font-weight: 700;
}
.class-followup {
    padding-top: 0.35rem;
}
.class-followup .seo-subject-pills {
    margin-bottom: 0.5rem;
}
.seo-h3,
.seo-faq h3 {
    margin: 1.35rem 0 0;
    font-size: 1.12rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.35;
    color: var(--heading);
}
.seo-h4 {
    margin: 1rem 0 0;
    font-size: 1.02rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.35;
    color: var(--heading);
}
.seo-h5 {
    margin: 0.85rem 0 0;
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.35;
    color: var(--navy);
}
.seo-h6 {
    margin: 0.75rem 0 0;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--pass);
}
.seo-list {
    margin: 0.75rem 0 0;
    padding: 0.85rem 1rem 0.85rem 1.6rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--card-bg);
    color: var(--ink);
}
.seo-list li {
    margin-top: 0.4rem;
    color: var(--ink);
}
.seo-list li:first-child {
    margin-top: 0;
}
.seo-faq {
    margin-top: 0.5rem;
}
.seo-faq-card {
    margin-top: 1rem;
    padding: 1rem 1.15rem 1.15rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--card-bg);
    box-shadow: var(--shadow-sm);
}
.seo-faq-card h3 {
    margin-top: 0;
}
.ub-footer {
    background: var(--ub-footer-bg);
    color: var(--ub-footer-text);
    padding-top: 0;
    margin-top: 16px;
    padding-bottom: env(safe-area-inset-bottom, 0);
}
.ub-footer-social {
    background: var(--ub-footer-social-bg);
    color: var(--on-accent);
    padding: 16px 0;
}
.ub-footer-social-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.ub-footer-social a {
    color: var(--on-accent) !important;
    margin-right: 16px;
    font-size: 1.35rem;
    text-decoration: none !important;
}
.ub-footer-grid {
    display: grid;
    align-items: start;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 28px;
    padding-top: 48px;
}
.ub-footer p,
.ub-footer li {
    margin: 0 0 8px;
    font-size: 0.95rem;
    line-height: 1.55;
}
.ub-footer ul { list-style: none; padding: 0; margin: 0; }
.ub-footer h6 {
    color: var(--ub-footer-heading);
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    font-size: 0.82rem;
    margin: 0 0 14px;
}
.ub-footer a {
    color: var(--ub-footer-link) !important;
    text-decoration: none !important;
    font-weight: 600;
}
.ub-footer a:hover {
    color: var(--ub-footer-heading) !important;
    text-decoration: underline !important;
}
.ub-footer-copy {
    border-top: 1px solid rgb(255 255 255 / 0.16);
    margin-top: 28px;
    padding: 16px 0;
    font-size: 0.9rem;
    color: var(--ub-footer-text);
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 30;
    border-bottom: 1px solid var(--header-border);
    background: var(--header-bg);
    color: var(--header-ink);
    backdrop-filter: blur(12px);
}
.header-inner, .footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    min-height: 4rem;
    flex-wrap: wrap;
}
.header-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 0;
}
.header-logo {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    object-fit: contain;
    flex-shrink: 0;
    background: var(--card-bg);
}
.header-app-title {
    font-size: clamp(0.95rem, 2.5vw, 1.05rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--header-ink);
    white-space: nowrap;
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    margin-left: auto;
    flex-wrap: wrap;
    justify-content: flex-end;
}
.nav-student {
    color: var(--header-ink);
    font-weight: 700;
    font-size: 0.9rem;
    max-width: 12rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.header-user {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    max-width: 14rem;
    min-width: 0;
}
.header-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
    border: 1px solid var(--line);
}
.header-account {
    position: relative;
    flex-shrink: 0;
}
.header-account-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: var(--tap);
    min-height: var(--tap);
    padding: 0.25rem;
    border: 2px solid var(--ub-line);
    border-radius: 50%;
    background: var(--ub-card);
    color: var(--header-ink);
    cursor: pointer;
    list-style: none;
}
.header-account-toggle::-webkit-details-marker { display: none; }
.header-account-toggle:hover,
.header-account[open] .header-account-toggle {
    border-color: var(--ub-blue);
    background: var(--ub-sky);
}
.header-account-toggle:focus-visible {
    outline: 3px solid rgb(37 99 235 / 0.28);
    outline-offset: 2px;
}
.header-avatar-fallback {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background:
        radial-gradient(circle at 50% 35%, var(--ub-muted) 0 20%, transparent 21%),
        radial-gradient(circle at 50% 105%, var(--ub-muted) 0 43%, transparent 44%);
}
.header-account-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    z-index: 80;
    min-width: 10rem;
    padding: 0.4rem;
    border: 1px solid var(--ub-line);
    border-radius: 12px;
    background: var(--ub-card);
    box-shadow: var(--ub-shadow);
    display: grid;
    gap: 0.25rem;
}
.header-account-name {
    display: flex;
    align-items: center;
    min-height: var(--tap);
    max-width: 14rem;
    padding: 0.6rem 0.75rem;
    overflow: hidden;
    color: var(--header-ink);
    font-size: 0.9rem;
    font-weight: 800;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.header-account-dashboard,
.header-account-logout {
    display: flex;
    align-items: center;
    width: 100%;
    min-height: var(--tap);
    padding: 0.6rem 0.75rem;
    border: 0;
    border-radius: 8px;
    background: transparent;
    color: var(--header-ink);
    font: inherit;
    font-weight: 700;
    text-align: left;
    cursor: pointer;
    text-decoration: none;
}
.header-account-dashboard:hover,
.header-account-dashboard:focus-visible,
.header-account-logout:hover,
.header-account-logout:focus-visible {
    background: var(--ub-sky);
    color: var(--ub-blue);
}
.header-logout-form {
    display: block;
    margin: 0;
}
.header-logout,
.header-login {
    border: 0;
    border-radius: 999px;
    min-height: var(--tap);
    padding: 0.55rem 1rem;
    background: var(--cta-bg);
    color: var(--on-accent);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 20px rgb(11 34 68 / 0.22);
}
.header-logout:hover,
.header-login:hover {
    filter: brightness(1.08);
    color: var(--on-accent);
}
.header-theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 0.4rem 0.7rem;
    background: var(--card-bg);
    color: var(--header-ink);
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
    transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.header-theme-toggle:hover {
    border-color: var(--brand-bright);
    background: var(--hover);
    color: var(--brand-bright);
}
.header-theme-icon::before {
    content: "🌙";
    font-size: 0.95rem;
    line-height: 1;
}
html[data-ub-theme="night"] .header-theme-icon::before {
    content: "☀️";
}
.header-class-picker select {
    min-width: 6.5rem;
    min-height: var(--tap);
    border: 2px solid var(--line);
    border-radius: 999px;
    padding: 0.55rem 1.4rem 0.55rem 0.85rem;
    background: var(--card-bg);
    color: var(--header-ink);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%230b2244' d='M1.41 0 6 4.58 10.59 0 12 1.41l-6 6-6-6z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.55rem center;
    background-size: 0.7rem auto;
}
html[data-ub-theme="night"] .header-class-picker select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23dce6f5' d='M1.41 0 6 4.58 10.59 0 12 1.41l-6 6-6-6z'/%3E%3C/svg%3E");
}
.header-class-picker select:focus {
    outline: 2px solid rgb(26 115 232 / 0.45);
    outline-offset: 1px;
    border-color: var(--brand-bright);
}
.header-class-picker select option {
    color: var(--ink);
    background: var(--card-bg);
}
.header-class-label {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 0.4rem 0.75rem;
    color: var(--header-ink);
    font-size: 0.85rem;
    font-weight: 700;
    white-space: nowrap;
    background: var(--card-bg);
}
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}
.brand { display: flex; align-items: center; }
.brand-logo {
    display: block;
    width: auto;
    max-width: 140px;
    height: 36px;
    object-fit: contain;
}
.nav { display: none; gap: 1.25rem; font-size: 0.92rem; font-weight: 600; }
.nav a { color: var(--muted); }
.nav a:hover,
.nav a.is-active { color: var(--brand-bright); }
.header-actions { display: flex; align-items: center; gap: 0.35rem; }
.site-footer {
    border-top: 1px solid rgb(255 255 255 / 0.08);
    background: var(--footer-bg);
    color: var(--white);
    font-size: 0.9rem;
}
.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1.5rem;
    padding: 2rem 0 1.25rem;
}
.footer-col { display: grid; gap: 0.45rem; align-content: start; }
.footer-name { font-weight: 800; font-size: 0.95rem; color: var(--white); margin: 0; }
.footer-heading { font-weight: 700; color: var(--white); margin: 0 0 0.15rem; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; }
.footer-text { margin: 0; line-height: 1.55; color: var(--footer-text); }
.footer-col a { color: var(--footer-link); font-size: 0.88rem; }
.footer-col a:hover { color: var(--white); }
.footer-copy {
    border-top: 1px solid rgb(255 255 255 / 0.12);
    padding: 0.85rem 0 1.1rem;
    text-align: center;
    font-size: 0.82rem;
    color: var(--footer-copy);
}
.footer-copy p { margin: 0; }

.flash {
    border-bottom: 1px solid var(--flash-line);
    background: var(--flash-bg);
    color: var(--flash-ink);
    text-align: center;
    padding: 0.75rem var(--content-gutter);
    font-size: 0.9rem;
    font-weight: 500;
}

.dashboard-band {
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    padding: 0.55rem 0 0.65rem;
}
.mocktest-page-head {
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    padding: 1.15rem 0 0.85rem;
}
.mocktest-page-title {
    margin: 0;
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 800;
    color: var(--heading);
    letter-spacing: -0.03em;
}
.page-intro {
    padding: 1.25rem 0 0.5rem;
    background: linear-gradient(180deg, var(--hero-1) 0%, var(--paper) 100%);
}
.dashboard-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 0.35rem;
}
.dashboard-title {
    font-size: 1.1rem;
    font-weight: 800;
}
.dashboard-kicker { margin: 0; font-size: 0.85rem; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: var(--radius-md);
    min-height: var(--tap);
    padding: 0.75rem 1.25rem;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    background: transparent;
    color: var(--ink);
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary {
    background: #1a73e8;
    color: var(--on-accent);
    box-shadow: 0 10px 24px rgb(26 115 232 / 0.28);
}
.btn-primary:hover {
    background: #1558c0;
    color: var(--on-accent);
    transform: translateY(-1px);
}
.btn-ink { background: var(--cta-bg); color: var(--on-accent); }
.btn-ink:hover { filter: brightness(1.08); color: var(--on-accent); }
.btn-mark { background: var(--mark-fill); color: var(--on-accent); }
.btn-mark:hover { filter: brightness(0.95); color: var(--on-accent); }
.palette .btn-mark { width: 100%; }
.btn-ghost { color: var(--ink); }
.btn-ghost:hover { color: var(--heading); background: var(--hover); }
.btn-outline {
    border: 2px solid var(--line);
    background: var(--card-bg);
    color: var(--ink);
}
.btn-back-subjects {
    gap: 0.45rem;
    background: var(--navy);
    color: var(--class-box-ink);
    box-shadow: 0 8px 20px rgb(11 34 68 / 0.2);
}
.btn-back-subjects:hover {
    background: #123056;
    color: #ffffff;
    transform: translateY(-1px);
    box-shadow: 0 10px 24px rgb(11 34 68 / 0.28);
}
.btn-back-subjects-icon {
    width: 1.15rem;
    height: 1.15rem;
    flex-shrink: 0;
}
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1rem; }
.class-grid {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    grid-auto-rows: 1fr;
    gap: 0.4rem;
    width: 100%;
    max-width: none;
    margin-top: 0.85rem;
}
.class-box {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    height: 100%;
    min-width: 0;
    width: 100%;
    min-height: 5.5rem;
    padding: 0;
    border: 2px solid var(--class-box-border);
    background: var(--class-box-bg);
    color: var(--class-box-ink);
    border-radius: 0.75rem;
    text-align: center;
    box-shadow: none;
    overflow: hidden;
    transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
}
.class-box-visual {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.22rem;
    padding: 0.45rem 0.2rem 0.4rem;
}
.class-box-book {
    display: block;
    width: auto;
    height: auto;
    flex: 1 1 auto;
    max-width: 2.15rem;
    max-height: 2.5rem;
    color: inherit;
    opacity: 1;
    filter: none;
    transition: transform 0.18s ease;
}
.class-box-label {
    position: static;
    transform: none;
    font-size: clamp(0.58rem, 0.72vw, 0.72rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: inherit;
    text-align: center;
    white-space: nowrap;
    pointer-events: none;
    text-shadow: none;
}
.class-box:hover .class-box-book {
    transform: scale(1.02);
}
.class-box:hover {
    border-color: var(--class-box-hover-border);
    background: var(--class-box-hover-bg);
    color: var(--class-box-ink);
    box-shadow: none;
    transform: translateY(-1px);
}
.class-box.is-on {
    border-color: var(--class-box-on-border);
    background: var(--class-box-on-bg);
    color: var(--class-box-on-ink);
    box-shadow: none;
    transform: none;
}
.class-box.is-on .class-box-book,
.class-box.is-on .class-box-label {
    color: inherit;
}

.kicker {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--pass);
}
.kicker-muted { color: var(--muted); }
.subject-kicker {
    text-transform: none;
    letter-spacing: 0.02em;
    font-size: 0.82rem;
}
.page-title { font-size: 1.2rem; font-weight: 800; letter-spacing: -0.03em; color: var(--heading); }
.subject-page .page-title {
    font-size: clamp(1.28rem, 2.3vw, 1.85rem);
    line-height: 1.25;
    max-width: 48rem;
}
.section-title { font-size: 1.3rem; font-weight: 800; letter-spacing: -0.03em; color: var(--heading); }
.lead { margin-top: 0.4rem; font-size: 0.95rem; line-height: 1.5; color: var(--muted); max-width: 40rem; }
.muted { color: var(--muted); }
.subtle { margin-top: 0.5rem; color: var(--muted); }
.link { font-weight: 600; color: var(--brand-bright); }

.hero {
    padding: 1.25rem 0 1.5rem;
    background:
        radial-gradient(circle at 12% 18%, rgb(26 115 232 / 0.22), transparent 32%),
        radial-gradient(circle at 88% 0%, rgb(74 212 192 / 0.14), transparent 28%),
        linear-gradient(180deg, var(--hero-1) 0%, var(--hero-2) 48%, var(--paper) 100%);
}
.hero-grid {
    display: grid;
    gap: 0.35rem;
    padding: 0.25rem 0 0.5rem;
}
.hero h1 { font-size: clamp(1.65rem, 4vw, 2.5rem); font-weight: 800; letter-spacing: -0.04em; line-height: 1.1; }
.hero .lead { font-size: 1rem; }
.hero.is-compact { padding-bottom: 0.75rem; }
.hero .actions { margin-top: 0.65rem; }
.meta dt { font-size: 0.7rem; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.meta dd { margin-top: 0.25rem; font-size: 1.25rem; font-weight: 800; }

.option-list { list-style: none; padding: 0; margin: 1.25rem 0 0; display: grid; gap: 0.5rem; }
.option-list li, .choice {
    border: 2px solid var(--line);
    border-radius: var(--radius-md);
    padding: 0.9rem 1rem;
    min-height: var(--tap);
    background: var(--card-bg);
    color: var(--ink);
}

.grid-2 { display: grid; gap: 0.85rem; margin-top: 1rem; }
.card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border: 1px solid var(--line);
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 0.9rem 1.1rem;
    box-shadow: var(--shadow-sm);
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.card:hover {
    border-color: var(--hover-border);
    background: var(--hover);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}
.card h2 { margin-top: 0.5rem; font-size: 1rem; color: var(--heading); }
.card p { margin-top: 0.5rem; font-size: 0.85rem; line-height: 1.55; color: var(--muted); }
.card-foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.75rem; align-items: center; margin-top: 1.25rem; }

.filters { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 2rem 0; }
.chip {
    border-radius: 999px;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    border: 1px solid var(--line);
    background: var(--card-bg);
    color: var(--muted);
}
.chip.is-on, .chip:hover { background: #1a73e8; color: var(--on-accent); border-color: #1a73e8; }
.empty { border: 1px dashed var(--line); background: var(--card-bg); border-radius: 1rem; padding: 1.25rem 1rem; text-align: center; color: var(--muted); }
.empty.is-loading { color: var(--brand-bright); font-weight: 600; }
.subject-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-rows: 1fr;
    gap: 0.85rem;
    margin-top: 0.85rem;
}
.subject-grid .subject-card,
.chapter-grid .chapter-card:not(.card-disabled) {
    position: relative;
    overflow: hidden;
    isolation: isolate;
    background: var(--tone-tint);
    border: 1px solid var(--tone-line);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.subject-grid .subject-card::before,
.chapter-grid .chapter-card:not(.card-disabled)::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--tone-accent);
    z-index: 1;
}
.subject-grid .subject-card::after,
.chapter-grid .chapter-card:not(.card-disabled)::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(120% 90% at 100% 0%, color-mix(in srgb, var(--tone-accent) 16%, transparent), transparent 58%);
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
    z-index: 0;
}
.subject-grid .card {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-lg);
}
.subject-grid .card .kicker {
    color: var(--tone-accent);
    opacity: 1;
}
.subject-grid .card h2 {
    color: var(--ink);
}
.subject-grid .card p {
    color: var(--muted);
}
.subject-grid .subject-card > * {
    position: relative;
    z-index: 1;
}
.subject-grid .card:hover,
.subject-grid .card.is-on {
    border-color: var(--tone-accent);
    background: var(--tone-tint-hover);
    box-shadow: 0 16px 36px color-mix(in srgb, var(--tone-accent) 22%, transparent);
}
.subject-grid .card:hover::after,
.subject-grid .card.is-on::after {
    opacity: 1;
}
.subject-card-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-top: 0.5rem;
}
.subject-card-title h2 {
    margin-top: 0;
    flex: 1;
    min-width: 0;
}
.subject-explore-btn {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.2rem;
    position: relative;
    z-index: 2;
    min-height: 2.1rem;
    padding: 0.28rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 800;
    color: var(--on-accent);
    background: var(--start-bg);
    border-radius: 0.4rem;
    white-space: nowrap;
    cursor: pointer;
    transition: background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
}
.subject-explore-arrow {
    color: var(--white);
    font-size: 1.25em;
    font-weight: 900;
    line-height: 1;
    -webkit-text-stroke: 0.75px var(--white);
    text-shadow: 0 0 0 var(--white);
}
.subject-explore-btn:hover,
.subject-explore-btn:focus-visible {
    background: var(--start-hover);
    color: var(--on-accent);
    box-shadow: var(--start-shadow);
    transform: translateY(-2px) scale(1.06);
    filter: brightness(1.08);
}
.subjects-band {
    border-top: 1px solid var(--line);
    background: var(--paper);
    padding: 1rem 0 1.15rem;
}
.subjects-band + .subjects-band {
    padding-top: 0.75rem;
}
.subjects-band.is-hidden { display: none; }
.subjects-mock-panel {
    width: 100%;
}
.subjects-mock-wrap {
    margin-top: 2.5rem;
}
.recent-activity-title {
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}
.subjects-mock-wrap .mock-history-grid {
    margin-top: 0;
}
.dashboard-take-test {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    margin-top: 0.85rem;
    min-height: var(--tap);
    padding: 1rem 1.2rem;
    border: 1px solid var(--subject-mock-border);
    border-radius: var(--radius-lg);
    background: var(--subject-mock-bg);
    color: var(--subject-mock-ink);
    font-weight: 800;
    text-decoration: none;
    box-shadow: var(--shadow-sm);
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.dashboard-take-test-icon {
    flex-shrink: 0;
    display: grid;
    place-items: center;
    width: 3rem;
    height: 3rem;
    border-radius: 0.9rem;
    background: var(--subject-mock-chip-bg);
    color: var(--subject-mock-ink);
}
.dashboard-take-test-icon svg {
    display: block;
    width: 1.45rem;
    height: 1.45rem;
}
.dashboard-take-test-main {
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.22rem;
    min-width: 0;
    text-align: left;
}
.dashboard-take-test-heading {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.dashboard-take-test-title {
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.2;
    color: var(--subject-mock-ink);
}
.dashboard-take-test-free {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 0.12rem 0.5rem;
    background: var(--pass-fill);
    color: var(--on-accent);
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    line-height: 1.2;
}
.dashboard-take-test-copy {
    font-size: 0.88rem;
    font-weight: 600;
    line-height: 1.45;
    color: var(--subject-mock-muted);
}
.dashboard-take-test-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: 0.28rem;
}
.dashboard-take-test-meta > span {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--subject-mock-chip-line);
    border-radius: 999px;
    padding: 0.22rem 0.6rem;
    background: var(--subject-mock-chip-bg);
    color: var(--subject-mock-ink);
    font-size: 0.72rem;
    font-weight: 700;
    line-height: 1.2;
}
.dashboard-take-test-go {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.2rem;
    min-height: 2.1rem;
    padding: 0.28rem 0.75rem;
    border-radius: 0.45rem;
    background: var(--start-bg);
    color: var(--on-accent);
    font-size: 0.8rem;
    font-weight: 800;
    white-space: nowrap;
    cursor: pointer;
    transition: background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease, filter 0.15s ease;
}
.dashboard-take-test:hover,
.dashboard-take-test:focus-visible {
    background: var(--subject-mock-bg-hover);
    color: var(--subject-mock-ink);
    box-shadow: var(--shadow);
}
.dashboard-take-test-go:hover,
.dashboard-take-test-go:focus-visible {
    background: var(--start-hover);
    color: var(--on-accent);
    box-shadow: var(--start-shadow);
    transform: translateY(-2px) scale(1.06);
    filter: brightness(1.08);
}
.mock-history-empty {
    flex: 1 1 100%;
    grid-column: 1 / -1;
    border-radius: 1rem;
}
.dashboard-band.is-hidden { display: none; }
.chapters-panel {
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 1px solid var(--line);
}
.chapters-panel.is-hidden { display: none; }
.chapter-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    grid-auto-rows: 1fr;
    gap: 0.85rem;
    margin-top: 0.85rem;
    width: 100%;
}
.chapter-grid .card {
    width: 100%;
    height: 100%;
    min-height: 7.5rem;
    border-radius: var(--radius-lg);
}
.chapter-grid .chapter-card {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 0.75rem;
}
.chapter-card-main {
    flex: 1;
    min-width: 0;
    position: relative;
    z-index: 1;
}
.chapter-card-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    margin-top: 0.5rem;
}
.chapter-card-stats span {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--tone-line);
    border-radius: 999px;
    padding: 0.18rem 0.5rem;
    background: var(--card-bg);
    color: var(--ink);
    font-size: 0.72rem;
    font-weight: 700;
    line-height: 1.2;
}
.chapter-card-action {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1;
}
.chapter-card-unavailable {
    margin-top: 0.35rem;
    margin-bottom: 0;
    font-size: 0.78rem;
    color: var(--muted);
}
.chapter-grid .chapter-card-start-btn {
    padding: 0.22rem 0.65rem;
    font-size: 0.76rem;
    border-radius: 0.35rem;
    min-width: 3.35rem;
    min-height: 2rem;
    justify-content: center;
    background: var(--start-bg);
    color: var(--on-accent);
}
.chapter-grid a.chapter-card:hover {
    border-color: var(--tone-accent);
    background: var(--tone-tint-hover);
    box-shadow: 0 16px 36px color-mix(in srgb, var(--tone-accent) 22%, transparent);
}
.chapter-grid a.chapter-card:hover::after {
    opacity: 1;
}
.chapter-grid .card .kicker {
    color: var(--tone-accent);
    opacity: 1;
}
.chapter-grid .card h2 {
    font-size: 1rem;
    line-height: 1.35;
    overflow-wrap: anywhere;
    word-break: normal;
    margin-top: 0;
    color: var(--ink);
}
.chapter-grid .card p {
    color: var(--muted);
}
.chapter-card-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-top: auto;
    padding-top: 0.5rem;
    min-height: 2rem;
}
.chapter-card-foot p {
    margin-top: 0;
    flex: 1;
    min-width: 0;
}
.chapter-start-btn {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;
    min-height: 2rem;
    min-width: 3.5rem;
    padding: 0.22rem 0.7rem;
    font-size: 0.78rem;
    font-weight: 800;
    border-radius: 0.4rem;
    background: var(--start-bg);
    color: var(--on-accent);
    line-height: 1.2;
    cursor: pointer;
    transition: background 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease, filter 0.15s ease;
}
.chapter-start-btn:not(.is-disabled):hover,
.chapter-start-btn:not(.is-disabled):focus-visible {
    background: var(--start-hover);
    color: var(--on-accent);
    box-shadow: var(--start-shadow);
    transform: translateY(-2px) scale(1.06);
    filter: brightness(1.08);
}
.chapter-start-btn.is-disabled {
    background: var(--neutral-bar);
    color: var(--muted);
    opacity: 1;
}
.chapter-grid .card-disabled {
    background: var(--paper);
    border-color: var(--line);
    box-shadow: none;
    opacity: 1;
    cursor: not-allowed;
}
.chapter-grid .card-disabled:hover {
    transform: none;
    border-color: var(--line);
    background: var(--paper);
    box-shadow: none;
}
.chapter-grid .card-disabled::before,
.chapter-grid .card-disabled::after {
    display: none;
}
.subject-mock-card {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 1.35rem;
    width: 40%;
    max-width: none;
    margin-bottom: 1.25rem;
    padding: 1.35rem 1.5rem;
    border: 1px solid var(--subject-mock-border);
    border-radius: var(--radius-lg);
    background: var(--subject-mock-bg);
    color: var(--subject-mock-ink);
    box-shadow: var(--shadow-sm);
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}
.subject-mock-main {
    flex: 1;
    min-width: 0;
}
.subject-mock-action {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: center;
}
.subject-mock-start-btn {
    padding: 0.28rem 0.8rem;
    font-size: 0.8rem;
    border-radius: 0.4rem;
    min-width: 3.6rem;
    min-height: 2.1rem;
    justify-content: center;
    background: var(--start-bg);
    color: var(--on-accent);
}
.subject-mock-start-btn:hover,
.subject-mock-start-btn:focus-visible {
    background: var(--start-hover);
    color: var(--on-accent);
    box-shadow: var(--start-shadow);
    transform: translateY(-2px) scale(1.06);
    filter: brightness(1.08);
}
.subject-mock-card:hover {
    background: var(--subject-mock-bg-hover);
    border-color: var(--subject-mock-border);
    box-shadow: var(--shadow);
}
.subject-mock-card .kicker {
    color: var(--subject-mock-muted);
}
.subject-mock-card h2 {
    margin-top: 0.45rem;
    font-size: 1.25rem;
    line-height: 1.35;
    color: var(--subject-mock-ink);
}
.subject-mock-copy {
    margin-top: 0.45rem;
    color: var(--subject-mock-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}
.subject-mock-card p {
    color: var(--subject-mock-muted);
}
.subject-mock-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin-top: 0.75rem;
}
.subject-mock-stats span {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--subject-mock-chip-line);
    border-radius: 999px;
    padding: 0.28rem 0.65rem;
    background: var(--subject-mock-chip-bg);
    color: var(--subject-mock-ink);
    font-size: 0.75rem;
    font-weight: 700;
}
.subject-mock-note {
    margin-top: 0.75rem;
    margin-bottom: 0;
    color: var(--subject-mock-muted);
    font-size: 0.85rem;
}
.subject-chapters-title {
    margin-bottom: 0.85rem;
}
.card-disabled {
    opacity: 0.72;
    cursor: not-allowed;
}
.desk-overview {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.25rem;
    margin-top: 0.25rem;
    align-items: stretch;
}
.desk-overview.is-hidden { display: none; }
.desk-overview-split {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.25rem;
    min-width: 0;
}
.desk-mock-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.4rem;
    width: 100%;
    padding: 0.55rem 0.65rem;
    border: 1px solid var(--line);
    border-radius: 0.75rem;
    background: var(--card-bg);
    cursor: pointer;
    text-align: left;
    color: inherit;
    text-decoration: none;
}
.desk-mock-panel .desk-mock-stat {
    flex: 1;
    min-width: 0;
}
.desk-mock-arrow {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.65rem;
    height: 1.65rem;
    border-radius: 999px;
    background: var(--hover);
    border: 1px solid var(--line);
    font-size: 1.15rem;
    font-weight: 800;
    line-height: 1;
    color: var(--heading);
    transition: transform 0.2s ease, background 0.2s ease;
}
.desk-mock-panel:hover .desk-mock-arrow {
    background: var(--hover-border);
    transform: translateX(2px);
}
.desk-mock-panel.is-on .desk-mock-arrow,
.desk-mock-panel.is-on:hover .desk-mock-arrow {
    transform: rotate(90deg);
}
.desk-mock-panel[data-tone="previous"] {
    background: var(--hover);
    border-color: var(--brand-bright);
}
.desk-mock-panel.is-on {
    box-shadow: 0 0 0 2px rgb(26 115 232 / 0.35);
    filter: brightness(1.03);
}
.desk-panel-inline {
    margin-top: 0;
    padding: 0.55rem 0.65rem;
    border-radius: 0.75rem;
}
.desk-nav {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.6rem;
    margin-top: 0.5rem;
}
.desk-nav-single {
    grid-template-columns: minmax(0, 1fr);
    max-width: 20rem;
}
.desk-tab {
    border: 1px solid transparent;
    border-radius: 0.9rem;
    padding: 0.65rem 0.5rem;
    font-weight: 700;
    cursor: pointer;
    color: var(--white);
}
.desk-tab[data-desk="score"] {
    background: var(--pass);
    border-color: var(--pass);
}
.desk-tab[data-desk="ranking"] {
    background: var(--brand-bright);
    border-color: var(--brand-bright);
}
.desk-tab[data-desk="previous"] {
    background: var(--navy);
    border-color: var(--navy);
}
.desk-tab:hover,
.desk-tab.is-on {
    color: var(--white);
    filter: brightness(1.12);
    box-shadow: 0 0 0 2px rgb(26 115 232 / 0.35);
}
.desk-panel {
    margin-top: 1rem;
    border: 1px solid var(--line);
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 1.15rem 1.25rem;
}
.desk-panel[data-tone="score"] {
    background: var(--pass-bg);
    border-color: var(--pass);
}
.desk-panel[data-tone="ranking"] {
    background: var(--hover);
    border-color: var(--brand-bright);
}
.desk-panel[data-tone="previous"] {
    background: var(--lilac);
    border-color: var(--lilac-border);
}
.desk-mock-panel[data-tone="previous"] {
    background: var(--hover);
    border-color: var(--brand-bright);
}
.desk-panel.is-hidden { display: none; }
.desk-panel h3 { font-size: 1rem; }
.desk-panel-title { margin-bottom: 0.65rem; font-size: 1rem; font-weight: 800; }
.desk-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    align-items: start;
}
.desk-stat {
    min-width: 0;
    text-align: center;
    padding: 0.15rem 0.45rem;
}
.desk-stat + .desk-stat {
    border-left: 1px solid rgb(15 157 138 / 0.28);
}
.desk-panel-label {
    display: block;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 0.25rem;
}
.desk-empty-note { margin-top: 0.5rem; font-size: 0.88rem; }
.desk-stat span { display: block; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.desk-stat strong { display: block; margin-top: 0.1rem; font-size: 1rem; }
.desk-rank { margin-top: 0; }
.desk-rank li.is-you { background: var(--hover); font-weight: 700; }
.mock-history-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-auto-rows: 1fr;
    gap: 0.85rem;
    margin-top: 0.85rem;
}
.mock-history-card {
    position: relative;
    overflow: hidden;
    isolation: isolate;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
    border: 1px solid var(--line);
    border-radius: 1rem;
    background: var(--card-bg);
    padding: 1rem 1.05rem 0.95rem;
    color: inherit;
    text-decoration: none;
    box-shadow: var(--shadow-sm);
    transition: background 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.mock-history-card::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    z-index: 1;
}
.mock-history-card > * {
    position: relative;
    z-index: 1;
}
.mock-history-card.is-pass {
    background: linear-gradient(180deg, var(--pass-bg) 0%, var(--card-bg) 62%);
    border-color: rgb(10 110 98 / 0.22);
}
.mock-history-card.is-pass::before { background: var(--pass); }
.mock-history-card.is-fail {
    background: linear-gradient(180deg, var(--fail-bg) 0%, var(--card-bg) 62%);
    border-color: rgb(196 69 28 / 0.22);
}
.mock-history-card.is-fail::before { background: var(--mark-fill); }
.mock-history-card.is-progress {
    background: linear-gradient(180deg, var(--hover) 0%, var(--card-bg) 62%);
    border-color: var(--hover-border);
}
.mock-history-card.is-progress::before { background: var(--brand-bright); }
.mock-history-card:hover {
    box-shadow: var(--shadow);
}
.mock-history-card.is-pass:hover { border-color: var(--pass); }
.mock-history-card.is-fail:hover { border-color: var(--mark-fill); }
.mock-history-card.is-progress:hover { border-color: var(--brand-bright); }
.mock-history-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}
.mock-history-head .kicker {
    margin: 0;
}
.mock-history-card.is-pass .kicker { color: var(--pass); }
.mock-history-card.is-fail .kicker { color: var(--mark); }
.mock-history-card.is-progress .kicker { color: var(--brand-bright); }
.mock-history-card h4,
.mock-history-card h2 {
    margin: 0;
    font-size: 1.02rem;
    line-height: 1.35;
    letter-spacing: -0.02em;
    color: var(--heading);
    overflow-wrap: anywhere;
}
.mock-history-meta {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    margin: auto 0 0;
    padding-top: 0.2rem;
    font-size: 0.82rem;
    line-height: 1.45;
    color: var(--muted);
}
.mock-history-details {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}
.mock-history-details > span {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 0.18rem 0.5rem;
    background: var(--card-bg);
    color: var(--ink);
    font-size: 0.72rem;
    font-weight: 700;
    line-height: 1.2;
}
.mock-history-action-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    width: 100%;
}
.mock-history-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.2rem;
    min-height: 1.85rem;
    padding: 0.2rem 0.7rem;
    border-radius: 999px;
    background: var(--brand-bright);
    color: var(--on-accent);
    font-size: 0.72rem;
    font-weight: 800;
    white-space: nowrap;
    transition: background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.mock-history-card.is-progress .mock-history-cta {
    background: var(--start-bg);
}
.mock-history-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgb(26 115 232 / 0.28);
    filter: brightness(1.08);
}
.mock-history-card.is-progress .mock-history-cta:hover {
    background: var(--start-hover);
    box-shadow: var(--start-shadow);
}
.mock-history-status {
    flex-shrink: 0;
    border-radius: 999px;
    padding: 0.2rem 0.55rem;
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.02em;
}
.mock-history-status.is-progress {
    background: var(--hover);
    color: var(--brand-bright);
}
.mock-history-status.is-completed {
    background: var(--pass-bg);
    color: var(--pass);
}
.mock-history-card.is-fail .mock-history-status.is-completed {
    background: var(--fail-bg);
    color: var(--mark);
}
.mock-history-score {
    flex-shrink: 0;
    min-width: 2.7rem;
    padding: 0.22rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    text-align: center;
    color: var(--on-accent);
}
.mock-history-score.is-pass { background: var(--pass-fill); }
.mock-history-score.is-fail { background: var(--mark-fill); }
.mock-history-score.is-progress {
    background: var(--brand-bright);
    color: var(--on-accent);
}
.previous-list { display: grid; gap: 0.85rem; margin-top: 0.85rem; }
.previous-card {
    border: 1px solid var(--line);
    border-radius: 0.9rem;
    background: var(--pass-bg);
    padding: 0.9rem 1rem;
}
.previous-top {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    align-items: flex-start;
}
.previous-stats { margin-top: 0.45rem; font-size: 0.9rem; font-weight: 600; }
.previous-questions {
    margin: 0.75rem 0 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 0.35rem;
    max-height: 14rem;
    overflow: auto;
}
.previous-questions li {
    display: grid;
    grid-template-columns: 1.1rem minmax(0, 1fr);
    gap: 0.45rem;
    font-size: 0.82rem;
    line-height: 1.4;
    color: var(--muted);
}
.previous-mark { font-weight: 800; }
.previous-questions li.is-correct .previous-mark,
.previous-questions li.is-correct { color: var(--pass); }
.previous-questions li.is-wrong .previous-mark,
.previous-questions li.is-wrong { color: var(--mark); }

.meta.box { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.85rem; margin-top: 1rem; padding: 1rem; }
.rules { margin-top: 1rem; }
.rules h2 { font-size: 1rem; }
.rules ul { margin: 0.75rem 0 0; padding-left: 1.25rem; color: var(--muted); font-size: 0.9rem; line-height: 1.6; }

.exam-ready-page { padding-bottom: 2rem; }
.exam-brief {
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--card-bg);
    box-shadow: var(--shadow-sm);
    padding: 1.25rem 1.35rem 1.35rem;
}
.exam-brief-title {
    margin-top: 0;
    font-size: clamp(1.05rem, 2.4vw, 1.4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.3;
    color: var(--heading);
}
.exam-brief-head { margin-bottom: 1.15rem; }
.exam-brief-meta {
    margin-top: 0.45rem;
    color: var(--muted);
    font-size: 0.95rem;
    font-weight: 600;
}
.exam-brief-stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.75rem;
}
.exam-stat {
    display: grid;
    gap: 0.2rem;
    justify-items: center;
    text-align: center;
    border: 1px solid var(--line);
    border-radius: 0.85rem;
    padding: 0.85rem 0.55rem;
    background: var(--card-bg);
}
.exam-stat-icon {
    display: grid;
    place-items: center;
    width: 2.1rem;
    height: 2.1rem;
    border-radius: 999px;
    margin-bottom: 0.15rem;
}
.exam-stat-icon svg { width: 1.15rem; height: 1.15rem; }
.exam-stat[data-tone="duration"] .exam-stat-icon { background: var(--pass-bg); color: var(--pass); }
.exam-stat[data-tone="questions"] .exam-stat-icon { background: var(--hover); color: var(--brand-bright); }
.exam-stat[data-tone="marks"] .exam-stat-icon { background: var(--lilac); color: var(--heading); }
.exam-stat[data-tone="cost"] .exam-stat-icon { background: var(--pass-bg); color: var(--pass); }
.exam-stat strong {
    font-size: 0.95rem;
    font-weight: 800;
    line-height: 1.25;
    color: var(--ink);
}
.exam-stat > span:last-child {
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
}
.exam-brief-subjects,
.exam-brief-instructions {
    margin-top: 1.15rem;
}
.exam-brief-label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin: 0 0 0.65rem;
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--ink);
}
.exam-brief-label-icon { font-size: 1rem; line-height: 1; }
.exam-brief-chips { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.exam-chip {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 0.45rem 0.85rem;
    background: var(--hover);
    border: 1px solid var(--line);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--ink);
}
.exam-brief-instructions {
    border-radius: 0.85rem;
    background: var(--paper);
    border: 1px solid var(--line);
    padding: 1rem 1.1rem;
}
.exam-brief-instructions ul {
    margin: 0;
    padding-left: 1.15rem;
    color: var(--muted);
    font-size: 0.92rem;
    line-height: 1.65;
}
.exam-brief-instructions li + li { margin-top: 0.45rem; }
.exam-brief-instructions strong { color: var(--ink); font-weight: 700; }
.exam-brief-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.15rem;
    align-items: center;
}
.exam-brief-actions form { margin: 0; }
.btn-start-exam {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    border: 0;
    border-radius: 0.5rem;
    min-height: 2.4rem;
    padding: 0.45rem 0.95rem;
    background: var(--start-bg);
    color: var(--on-accent);
    font-size: 0.9rem;
    font-weight: 800;
    cursor: pointer;
    transition: background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
.btn-start-exam:hover {
    background: var(--start-hover);
    color: var(--on-accent);
    box-shadow: var(--start-shadow);
    transform: translateY(-2px) scale(1.04);
    filter: brightness(1.08);
}
.btn-start-arrow {
    font-size: 0.95rem;
    font-weight: 900;
    line-height: 1;
}
.exam-brief-back {
    min-height: 2.4rem;
    width: auto;
    padding-inline: 0.75rem;
    white-space: nowrap;
}
.exam-features {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}
.exam-feature {
    border: 1px solid var(--line);
    border-radius: 1rem;
    background: var(--card-bg);
    padding: 1.35rem 1.1rem 1.2rem;
    text-align: center;
    box-shadow: var(--shadow-sm);
}
.exam-feature-icon {
    display: grid;
    place-items: center;
    width: 3.25rem;
    height: 3.25rem;
    margin: 0 auto 0.85rem;
    border-radius: 999px;
    color: var(--white);
}
.exam-feature-icon svg {
    width: 1.45rem;
    height: 1.45rem;
}
.exam-feature[data-tone="pattern"] .exam-feature-icon { background: var(--mark); }
.exam-feature[data-tone="timed"] .exam-feature-icon { background: var(--pass); }
.exam-feature[data-tone="results"] .exam-feature-icon { background: var(--brand-bright); }
.exam-feature h3 {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--heading);
}
.exam-feature p {
    margin: 0.55rem 0 0;
    font-size: 0.82rem;
    line-height: 1.55;
    color: var(--muted);
}
.exam-signup-card { margin-top: 1.15rem; }
.exam-signup-card .btn-start-exam { width: 100%; justify-content: center; margin-top: 0.5rem; }
.signup-modal .signup-card {
    position: relative;
    width: min(36rem, 100%);
    max-height: calc(100dvh - 2rem);
    overflow: auto;
}
.signup-modal .student-fields {
    grid-template-columns: 1fr;
    margin-top: 1rem;
}
.signup-modal .signup-submit {
    width: 100%;
    justify-content: center;
    margin-top: 0.85rem;
}
.signup-close {
    position: absolute;
    top: 0.85rem;
    right: 0.85rem;
    border: 0;
    background: transparent;
    color: var(--muted);
    font-size: 1.75rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.15rem 0.35rem;
}
.signup-close:hover { color: var(--ink); }
.list { list-style: none; padding: 0; margin: 0.75rem 0 0; border: 1px solid var(--line); border-radius: 1rem; background: var(--card-bg); overflow: hidden; }
.list li { display: flex; justify-content: space-between; gap: 0.75rem; padding: 0.85rem 1.25rem; border-top: 1px solid var(--line); }
.list li:first-child { border-top: 0; }

.exam-bar, .exam-paper, .palette {
    border: 1px solid var(--line);
    background: var(--card-bg);
    border-radius: 1rem;
}
.exam-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
}
.exam-layout { display: grid; gap: 1.5rem; }
.exam-paper { position: relative; padding: 1.5rem; }
.question .kicker {
    min-height: 1.85rem;
    padding-right: 4.25rem;
    display: flex;
    align-items: center;
}
.exam-paper:has(#hint-btn.is-hidden) .question .kicker {
    padding-right: 0;
    min-height: 0;
    display: block;
}
.question.is-hidden { display: none; }
.question h2 { margin-top: 0.75rem; font-size: 1.1rem; }
.choice-list { display: grid; gap: 0.5rem; margin-top: 1.5rem; }
.choice { display: flex; align-items: flex-start; gap: 0.75rem; cursor: pointer; background: var(--card-bg); }
.choice:has(input:checked) { border-color: var(--brand-bright); background: var(--hover); }
.question-hint {
    margin-top: 1.25rem;
    padding: 0.85rem 1rem;
    border: 1px solid var(--flash-line);
    border-radius: 0.75rem;
    background: var(--flash-bg);
    color: var(--flash-ink);
}
.question-hint.is-hidden { display: none; }
.question-hint .kicker { margin-bottom: 0.35rem; }
.exam-nav { display: flex; justify-content: space-between; align-items: center; gap: 0.75rem; margin-top: 2rem; }
.exam-nav .btn { min-width: 7.5rem; }
#hint-btn:not(.is-hidden) {
    position: absolute;
    top: 1.25rem;
    right: 1.25rem;
    z-index: 2;
}
#hint-btn {
    min-width: 0;
    min-height: 1.85rem;
    padding: 0.18rem 0.58rem;
    border-radius: 999px;
    border: 1px solid rgb(196 138 18 / 0.5);
    background: var(--flash-bg);
    color: var(--flash-ink);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.03em;
    line-height: 1.2;
    box-shadow: none;
}
#hint-btn:hover,
#hint-btn:focus-visible {
    background: #ffe3b8;
    border-color: var(--flash-line);
    color: var(--flash-ink);
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgb(196 138 18 / 0.22);
}
#hint-btn.is-on {
    border-color: var(--flash-line);
    background: #f5b942;
    color: #6b4500;
}
.palette {
    padding: 0.85rem;
    height: fit-content;
    display: grid;
    gap: 0.75rem;
}
.palette-head { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; }
.palette-q-meta {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    flex-wrap: wrap;
}
.palette-q-meta strong {
    font-size: 1rem;
    font-weight: 800;
    color: var(--ink);
}
.palette-badge {
    display: inline-flex;
    align-items: center;
    border-radius: 0.3rem;
    padding: 0.12rem 0.45rem;
    background: rgb(26 115 232 / 0.12);
    color: var(--brand-bright);
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.palette-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.45rem;
}
.palette-action-btn {
    border-radius: 999px;
    min-height: 1.85rem;
    padding: 0.18rem 0.55rem;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    line-height: 1.2;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}
#mark-review-btn {
    border: 1px solid rgb(26 115 232 / 0.4);
    background: var(--hover);
    color: var(--brand-bright);
}
#mark-review-btn:hover,
#mark-review-btn:focus-visible {
    background: #d6e8ff;
    border-color: var(--brand-bright);
    color: var(--brand-bright);
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgb(26 115 232 / 0.22);
}
#mark-review-btn.is-on {
    background: var(--brand-bright);
    border-color: var(--brand-bright);
    color: var(--on-accent);
}
#clear-answer-btn {
    border: 1px solid rgb(196 69 28 / 0.4);
    background: var(--fail-bg);
    color: var(--mark);
}
#clear-answer-btn:hover,
#clear-answer-btn:focus-visible {
    background: #ffd8cc;
    border-color: var(--mark);
    color: var(--mark);
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgb(196 69 28 / 0.22);
}
.palette-stats {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    flex-wrap: wrap;
    padding: 0.55rem 0.65rem;
    border: 1px solid var(--line);
    border-radius: 0.55rem;
    background: var(--paper);
}
.palette-stat {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.18rem 0.45rem;
    border-radius: 0.35rem;
    font-size: 0.78rem;
    font-weight: 800;
    line-height: 1.2;
}
.palette-stat.is-answered { color: var(--white); background: var(--pass); }
.palette-stat.is-marked { color: var(--white); background: var(--brand-bright); }
.palette-stat.is-unanswered { color: var(--white); background: var(--mark); }
.palette-progress {
    margin-left: auto;
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--muted);
    white-space: nowrap;
}
.palette-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.4rem;
}
.palette-btn {
    min-height: var(--tap);
    min-width: 44px;
    border: 2px solid var(--neutral-border);
    border-radius: 0.5rem;
    background: var(--card-bg);
    color: var(--ink);
    font-weight: 800;
    font-size: 0.9rem;
    cursor: pointer;
    transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}
.palette-btn.is-unvisited { background: var(--card-bg); border-color: var(--neutral-border); color: var(--ink); }
.palette-btn.is-unanswered { background: var(--mark); border-color: var(--mark); color: var(--white); }
.palette-btn.is-answered { background: var(--pass); border-color: var(--pass); color: var(--white); }
.palette-btn.is-marked { background: var(--brand-bright); border-color: var(--brand-bright); color: var(--white); }
.palette-btn.is-marked-answered { background: var(--brand-bright-hover); border-color: var(--brand-bright-hover); color: var(--white); }
.palette-btn.is-current {
    background: var(--muted);
    border-color: var(--muted);
    color: var(--white);
    box-shadow: none;
}
.palette-btn:hover { transform: translateY(-1px); }
.palette-legend {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.35rem 0.55rem;
}
.palette-legend li {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.68rem;
    color: var(--muted);
    line-height: 1.25;
}
.palette-legend-box {
    width: 0.85rem;
    height: 0.85rem;
    border-radius: 0.2rem;
    flex-shrink: 0;
    border: 1px solid var(--neutral-border);
    background: var(--card-bg);
}
.palette-legend-box.is-unanswered { background: var(--mark); border-color: var(--mark); }
.palette-legend-box.is-answered { background: var(--pass); border-color: var(--pass); }
.palette-legend-box.is-marked { background: var(--brand-bright); border-color: var(--brand-bright); }
.palette-legend-box.is-marked-answered { background: var(--brand-bright-hover); border-color: var(--brand-bright-hover); }
.palette-legend-box.is-current { background: var(--muted); border-color: var(--muted); }
.palette-legend-review { grid-column: 2; }
.btn-submit-exam {
    width: 100%;
    border: 0;
    border-radius: 0.75rem;
    min-height: var(--tap);
    padding: 0.85rem 1rem;
    background: var(--mark-fill);
    color: var(--on-accent);
    font-size: 1rem;
    font-weight: 800;
    cursor: pointer;
    transition: filter 0.15s ease, transform 0.15s ease;
}
.btn-submit-exam:hover {
    filter: brightness(0.95);
    transform: translateY(-1px);
}
.submit-modal {
    position: fixed;
    inset: 0;
    z-index: 80;
    display: grid;
    place-items: center;
    padding: 1rem;
    background: rgb(7 16 28 / 0.58);
    backdrop-filter: blur(6px);
}
.submit-modal.is-hidden { display: none; }
.submit-card {
    position: relative;
    width: min(26.5rem, 100%);
    overflow: hidden;
    border: 1px solid var(--card-border);
    border-radius: 1.25rem;
    background: var(--card-bg);
    padding: 1.45rem 1.35rem 1.3rem;
    box-shadow: 0 24px 64px rgb(11 34 68 / 0.28);
    animation: exam-dialog-in 0.22s ease;
}
.submit-card h2 {
    margin-top: 0.2rem;
    font-size: 1.35rem;
    letter-spacing: -0.03em;
    color: var(--heading);
}
.submit-card .lead {
    margin-top: 0.4rem;
    font-size: 0.92rem;
    line-height: 1.55;
}
.exam-dialog {
    background:
        radial-gradient(circle at 100% 0%, rgb(26 115 232 / 0.1), transparent 42%),
        var(--card-bg);
}
.exam-dialog::before {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 5px;
    background: linear-gradient(90deg, var(--start-bg), #f97316 70%, #fb923c);
}
.exam-dialog--leave {
    background:
        radial-gradient(circle at 0% 0%, rgb(26 115 232 / 0.14), transparent 44%),
        var(--card-bg);
}
.exam-dialog--leave::before {
    background: linear-gradient(90deg, var(--brand-bright), #60a5fa 72%, #93c5fd);
}
.exam-dialog-icon {
    display: grid;
    place-items: center;
    width: 3rem;
    height: 3rem;
    margin-bottom: 0.85rem;
    border-radius: 0.95rem;
    box-shadow: 0 8px 18px rgb(11 34 68 / 0.1);
}
.exam-dialog-icon svg {
    width: 1.45rem;
    height: 1.45rem;
}
.exam-dialog--submit .exam-dialog-icon {
    background: var(--fail-bg);
    color: var(--mark-fill);
}
.exam-dialog--leave .exam-dialog-icon {
    background: var(--hover);
    color: var(--brand-bright);
}
.exam-dialog--submit .exam-dialog-kicker { color: var(--mark); }
.exam-dialog--leave .exam-dialog-kicker { color: var(--brand-bright); }
.exam-dialog-note {
    display: inline-flex;
    align-items: center;
    margin: 0.9rem 0 0;
    padding: 0.32rem 0.7rem;
    border-radius: 999px;
    background: var(--pass-bg);
    color: var(--pass);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.01em;
}
.submit-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.7rem;
    margin-top: 1.15rem;
}
.submit-stat {
    border: 1px solid transparent;
    border-radius: 0.95rem;
    padding: 0.8rem 0.85rem;
}
.submit-stat.is-answered {
    background: var(--pass-bg);
    border-color: rgb(10 110 98 / 0.2);
}
.submit-stat.is-unanswered {
    background: var(--fail-bg);
    border-color: rgb(196 69 28 / 0.2);
}
.submit-stats dt {
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}
.submit-stat.is-answered dt { color: var(--pass); }
.submit-stat.is-unanswered dt { color: var(--mark); }
.submit-stats dd {
    margin: 0.28rem 0 0;
    font-size: 1.55rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.04em;
}
.submit-stat.is-answered dd { color: var(--pass-fill); }
.submit-stat.is-unanswered dd { color: var(--mark-fill); }
.submit-actions {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
    margin-top: 1.2rem;
}
.submit-actions .btn {
    width: 100%;
    flex: 1 1 auto;
    border-radius: 999px;
    font-weight: 800;
}
.exam-dialog-secondary.btn-outline {
    border-color: var(--hover-border);
    background: var(--card-bg);
    color: var(--brand-bright);
}
.exam-dialog-secondary.btn-outline:hover {
    background: var(--hover);
    border-color: var(--brand-bright);
    color: var(--brand-bright);
}
.exam-dialog-primary.btn-mark {
    background: var(--start-bg);
    box-shadow: var(--start-shadow);
}
.exam-dialog-primary.btn-mark:hover {
    background: var(--start-hover);
    filter: none;
    transform: translateY(-1px);
}
@keyframes exam-dialog-in {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: none;
    }
}
#timer {
    border-radius: 999px;
    background: var(--brand-bright);
    color: var(--white);
    padding: 0.35rem 1rem;
    font-family: ui-monospace, Consolas, monospace;
    font-weight: 700;
    font-size: 0.9rem;
}
#timer.is-urgent { background: var(--mark); }

.score-grid { display: grid; gap: 1rem; margin-top: 1rem; align-items: stretch; }
.score-ring {
    display: grid;
    place-items: center;
    aspect-ratio: 1;
    border: 1px solid var(--line);
    background: var(--card-bg);
    border-radius: 1.5rem;
    min-height: 10rem;
    text-align: center;
}
.score-ring.score-breakdown {
    aspect-ratio: unset;
    min-height: 10rem;
    padding: 1.35rem 1rem;
}
.score-breakdown-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem 0.75rem;
    width: 100%;
    margin: 0;
}
.score-breakdown-grid > div:nth-child(4) {
    grid-column: 1;
}
.score-breakdown-grid > div:nth-child(5) {
    grid-column: 3;
}
.score-breakdown-grid dt {
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
}
.score-breakdown-grid dd {
    margin: 0.25rem 0 0;
    font-size: 1.35rem;
    font-weight: 800;
    line-height: 1.2;
}
.score-ring strong { font-size: 2.5rem; font-weight: 800; }

.result-summary-card {
    margin-top: 1.25rem;
    border: 1px solid var(--line);
    border-radius: 1rem;
    background: var(--card-bg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}
.result-summary-card::before {
    content: '';
    display: block;
    height: 3px;
    background: var(--pass);
}
.result-summary-grid {
    display: grid;
    gap: 1.35rem;
    padding: 1.35rem 1.15rem;
}
.result-summary-score {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.55rem;
}
.result-donut {
    --score-pct: 0;
    --donut-color: var(--pass);
    position: relative;
    width: 9.25rem;
    height: 9.25rem;
    border-radius: 50%;
    background: conic-gradient(
        var(--donut-color) 0 calc(var(--score-pct) * 1%),
        var(--neutral-bar) calc(var(--score-pct) * 1%) 100%
    );
}
.result-donut-hole {
    position: absolute;
    inset: 0.8rem;
    display: grid;
    place-content: center;
    gap: 0.15rem;
    border-radius: 50%;
    background: var(--card-bg);
    text-align: center;
}
.result-donut-hole strong {
    font-size: 1.35rem;
    font-weight: 800;
    line-height: 1.15;
    color: var(--ink);
}
.result-donut-hole span {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--muted);
}
.result-net-score {
    margin: 0;
    font-size: 0.78rem;
    color: var(--muted);
}
.result-cutoff {
    margin: 0;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--gold-text);
}
.result-summary-accuracy {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0.75rem;
    min-width: 0;
}
.result-accuracy-head {
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.45rem;
    line-height: 1.35;
}
.result-accuracy-head strong {
    font-size: 2rem;
    font-weight: 800;
    color: var(--ink);
}
.result-accuracy-head span {
    font-size: 0.82rem;
    color: var(--muted);
}
.result-accuracy-bar {
    display: flex;
    width: 100%;
    height: 0.45rem;
    overflow: hidden;
    border-radius: 999px;
    background: var(--neutral-bar);
}
.result-accuracy-bar > span {
    display: block;
    height: 100%;
}
.result-accuracy-bar .is-correct { background: var(--pass); }
.result-accuracy-bar .is-wrong { background: var(--mark); }
.result-accuracy-bar .is-skipped { background: var(--mark); }
.result-accuracy-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem 1.1rem;
    margin: 0;
    padding: 0;
    list-style: none;
    font-size: 0.78rem;
    color: var(--muted);
}
.result-accuracy-legend li {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}
.result-accuracy-legend .dot {
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    flex-shrink: 0;
}
.result-accuracy-legend .dot.is-correct { background: var(--pass); }
.result-accuracy-legend .dot.is-wrong { background: var(--mark); }
.result-accuracy-legend .dot.is-skipped { background: var(--mark); }
.result-summary-rank {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    min-width: 0;
}
.result-rank-box {
    border-radius: 0.75rem;
    padding: 0.95rem 1rem;
    background: linear-gradient(180deg, var(--hero-1) 0%, var(--paper) 100%);
    border: 1px solid var(--card-border);
}
.result-rank-box--muted {
    background: var(--card-bg);
}
.result-rank-kicker {
    display: block;
    font-size: 0.62rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--pass);
}
.result-rank-line {
    margin: 0.45rem 0 0;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.45rem 0.65rem;
}
.result-rank-line strong {
    font-size: 1.65rem;
    font-weight: 800;
    line-height: 1.1;
    color: var(--heading);
}
.result-rank-line span {
    font-size: 0.82rem;
    color: var(--muted);
}
.result-rank-meta {
    margin: 0.4rem 0 0;
    font-size: 0.78rem;
    color: var(--muted);
    line-height: 1.45;
}
.result-review-skipped,
.result-review-all {
    width: 100%;
    justify-content: center;
    text-align: center;
    font-size: 0.88rem;
}
.pass { color: var(--pass); }
.fail { color: var(--mark); }
.badge { border-radius: 999px; padding: 0.2rem 0.65rem; font-size: 0.7rem; font-weight: 700; white-space: nowrap; }
.badge-ok { background: var(--pass-bg); color: var(--pass); }
.badge-no { background: var(--fail-bg); color: var(--mark); }
.key-block { margin-top: 1.25rem; }
.review-jump {
    display: grid;
    grid-template-columns: repeat(10, minmax(0, 1fr));
    gap: 0.5rem;
    margin-top: 0.85rem;
}
.review-jump-btn {
    display: grid;
    place-items: center;
    min-height: 2.25rem;
    border: 1px solid var(--line);
    border-radius: 0.5rem;
    background: var(--paper);
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--ink);
    text-decoration: none;
}
.review-jump-btn:hover { border-color: var(--brand); background: var(--hover); }
.review-jump-btn.is-correct { background: var(--pass-bg); border-color: var(--pass); color: var(--pass); }
.review-jump-btn.is-wrong { background: var(--fail-bg); border-color: var(--mark); color: var(--mark); }
.review-jump-btn.is-skipped { background: var(--fail-bg); border-color: var(--mark); color: var(--mark); }

.key-item { margin-top: 1rem; scroll-margin-top: 5rem; }
.key-head { display: flex; justify-content: space-between; gap: 0.75rem; align-items: flex-start; }
.key-option { border-radius: 0.5rem; padding: 0.5rem 0.75rem; font-size: 0.9rem; color: var(--muted); }
.key-option.is-key { background: var(--pass-bg); color: var(--pass); font-weight: 500; }
.key-option.is-pick { background: var(--fail-bg); color: var(--mark); }

@media (min-width: 900px) {
    .result-summary-grid {
        grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.25fr) minmax(0, 1fr);
        align-items: center;
        gap: 1.75rem;
        padding: 1.5rem 1.75rem;
    }
}
.result-review-band {
    margin-top: 1.25rem;
    border-top: 1px solid var(--line);
    background: var(--paper);
    padding: 1rem 0 1.5rem;
}
.result-review { margin-top: 0; }
.result-review-head {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.85rem;
    margin-bottom: 1rem;
}
.result-review-head .section-title { margin: 0; }
.result-review-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.45rem;
    margin-left: auto;
}
.result-more-tests {
    white-space: nowrap;
    border-radius: 999px;
    min-height: 44px;
    padding: 0.5rem 1rem;
    font-size: 0.88rem;
    font-weight: 800;
}
.result-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
}
.result-filter {
    border: 2px solid var(--line);
    border-radius: 999px;
    min-height: 44px;
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    color: var(--ink);
    font-size: 0.88rem;
    font-weight: 800;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.result-filter:hover,
.result-filter.is-on[data-filter="all"] {
    border-color: var(--brand-bright);
    background: var(--hover);
    color: var(--brand-bright);
}
.result-filter.is-on[data-filter="correct"],
.result-filter[data-filter="correct"]:hover {
    border-color: var(--pass);
    background: var(--pass-bg);
    color: var(--pass);
}
.result-filter.is-on[data-filter="wrong"],
.result-filter[data-filter="wrong"]:hover {
    border-color: var(--mark);
    background: var(--fail-bg);
    color: var(--mark);
}
.result-filter.is-on[data-filter="skipped"],
.result-filter[data-filter="skipped"]:hover {
    border-color: var(--muted);
    background: var(--paper);
    color: var(--muted);
}
.result-layout { margin-top: 0.25rem; }
.result-paper { min-height: 24rem; }
.result-question.is-hidden { display: none; }
.result-q-top {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 1rem;
}
.result-q-label {
    margin: 0;
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--ink);
}
.result-q-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.55rem;
}
.result-subject-tag {
    display: inline-flex;
    align-items: center;
    border-radius: 0.35rem;
    padding: 0.22rem 0.55rem;
    background: var(--pass-bg);
    color: var(--pass);
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.result-status {
    font-size: 0.82rem;
    font-weight: 800;
}
.result-status.is-correct { color: var(--pass); }
.result-status.is-wrong { color: var(--mark); }
.result-status.is-skipped { color: var(--muted); }
.result-q-text {
    margin-top: 0;
    font-size: 1.05rem;
    line-height: 1.55;
}
.result-options {
    list-style: none;
    margin: 1.25rem 0 0;
    padding: 0;
    display: grid;
    gap: 0.65rem;
}
.result-option {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    padding: 0.9rem 1rem;
    border: 1px solid var(--line);
    border-radius: 0.75rem;
    background: var(--card-bg);
    color: var(--ink);
    font-size: 0.95rem;
    line-height: 1.45;
}
.result-option-letter {
    flex-shrink: 0;
    display: grid;
    place-items: center;
    width: 1.85rem;
    height: 1.85rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 800;
    color: var(--muted);
    background: var(--card-bg);
}
.result-option.is-correct {
    border-color: rgb(15 157 138 / 0.45);
    background: var(--pass-bg);
}
.result-option.is-correct .result-option-letter {
    border-color: var(--pass);
    background: var(--pass);
    color: var(--white);
}
.result-option.is-wrong {
    border-color: rgb(255 106 61 / 0.45);
    background: var(--fail-bg);
}
.result-option.is-wrong .result-option-letter {
    border-color: var(--mark);
    background: var(--mark);
    color: var(--white);
}
.result-explanation { margin-top: 1.25rem; }
.result-explanation-label {
    margin: 0 0 0.5rem;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--brand-bright);
}
.result-explanation-body {
    padding: 0.9rem 1rem;
    border: 1px solid var(--line);
    border-radius: 0.75rem;
    background: var(--paper);
    color: var(--ink);
    font-size: 0.92rem;
    line-height: 1.55;
}
.result-explanation-body p { margin: 0; }
.result-nav { margin-top: 1.75rem; }
.result-palette { position: sticky; top: calc(4rem + env(safe-area-inset-top, 0)); }
.result-jump-label {
    margin: 0;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
}
.result-jump-btn {
    min-height: var(--tap);
    border: 2px solid var(--neutral-border);
    border-radius: 0.5rem;
    background: var(--card-bg);
    color: var(--ink);
    font-weight: 800;
    font-size: 0.9rem;
    cursor: pointer;
    transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
}
.result-jump-btn:hover:not(:disabled):not(.is-filtered-out) { transform: translateY(-1px); }
.result-jump-btn[data-status="correct"],
.result-jump-btn.is-correct {
    background: var(--pass);
    border-color: var(--pass);
    color: var(--white);
}
.result-jump-btn[data-status="wrong"],
.result-jump-btn.is-wrong {
    background: var(--mark);
    border-color: var(--mark);
    color: var(--white);
}
.result-jump-btn[data-status="skipped"],
.result-jump-btn.is-skipped {
    background: var(--muted);
    border-color: var(--muted);
    color: var(--white);
}
.result-jump-btn.is-current {
    box-shadow: inset 0 0 0 2px var(--white), 0 0 0 2px var(--brand-bright);
}
.result-jump-btn.is-current[data-status="correct"],
.result-jump-btn.is-current.is-correct {
    background: var(--pass);
    border-color: var(--pass);
    color: var(--white);
}
.result-jump-btn.is-current[data-status="wrong"],
.result-jump-btn.is-current.is-wrong {
    background: var(--mark);
    border-color: var(--mark);
    color: var(--white);
}
.result-jump-btn.is-current[data-status="skipped"],
.result-jump-btn.is-current.is-skipped {
    background: var(--muted);
    border-color: var(--muted);
    color: var(--white);
}
.result-jump-btn.is-filtered-out {
    opacity: 0.35;
    cursor: not-allowed;
}
.palette-legend-box.is-correct { background: var(--pass); border-color: var(--pass); }
.palette-legend-box.is-wrong { background: var(--mark); border-color: var(--mark); }
.palette-legend-box.is-skipped { background: var(--muted); border-color: var(--muted); }
.palette-legend.result-legend {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.55rem 0.75rem;
}
.result-legend li {
    white-space: nowrap;
}
.result-legend {
    margin-top: 0.15rem;
}
.tag { margin-left: 0.5rem; font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; }
.meta .note { grid-column: 1 / -1; }
.correct-line {
    margin-top: 0.75rem;
    padding: 0.65rem 0.8rem;
    border-radius: 0.65rem;
    background: var(--pass-bg);
    color: var(--pass);
    font-size: 0.92rem;
}

.student-gate { margin-top: 1rem; }
.student-gate > p { margin-top: 0.5rem; color: var(--muted); }
.student-gate form { margin-top: 0; }
.btn-google {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    margin-top: 0.75rem;
    border: 1px solid var(--line);
    background: var(--card-bg);
    color: var(--ink);
    font-weight: 700;
}
.btn-google:hover { background: var(--hover); border-color: var(--brand); }

.google-sign-in-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    min-height: var(--tap);
    padding: 0 1rem;
    border: 2px solid #5f6368;
    border-radius: 0.5rem;
    background: #ffffff;
    color: #1f1f1f;
    font-family: 'Roboto', 'Plus Jakarta Sans', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    line-height: 1;
    text-decoration: none;
    cursor: pointer;
    transition: background 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease, transform 0.18s ease;
    box-shadow: 0 1px 2px rgb(60 64 67 / 0.08);
}

.google-sign-in-btn:hover {
    background: #f7f8f8;
    border-color: #747775;
    box-shadow: 0 1px 3px rgb(60 64 67 / 0.15);
}

.google-sign-in-btn--block {
    width: 100%;
    min-height: 52px;
}

.google-sign-in-btn__icon {
    display: inline-flex;
    width: 1.125rem;
    height: 1.125rem;
    flex-shrink: 0;
}

.google-sign-in-btn__icon svg {
    display: block;
    width: 100%;
    height: 100%;
}

html[data-ub-theme="night"] .google-sign-in-btn {
    background: #131314;
    border-color: #8e918f;
    color: #e3e3e3;
    box-shadow: none;
}

html[data-ub-theme="night"] .google-sign-in-btn:hover {
    background: #1f1f1f;
    border-color: #8e918f;
}

.login-page .ub-footer,
.login-page .site-footer {
    display: none;
}

.login-page .login-screen {
    min-height: calc(100vh - 5rem);
}

.login-page .main {
    position: relative;
    overflow: hidden;
}

.login-page .main::before,
.login-page .main::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
    filter: blur(0.5px);
}

.login-page .main::before {
    top: -8rem;
    right: -6rem;
    width: 22rem;
    height: 22rem;
    background: radial-gradient(circle, rgb(26 115 232 / 0.14), transparent 68%);
}

.login-page .main::after {
    bottom: -10rem;
    left: -8rem;
    width: 26rem;
    height: 26rem;
    background: radial-gradient(circle, rgb(15 157 138 / 0.12), transparent 70%);
}

html[data-ub-theme="night"] .login-page .main::before {
    background: radial-gradient(circle, rgb(26 115 232 / 0.22), transparent 68%);
}

html[data-ub-theme="night"] .login-page .main::after {
    background: radial-gradient(circle, rgb(74 212 192 / 0.14), transparent 70%);
}

.login-screen--polished {
    position: relative;
    z-index: 1;
    gap: 1.35rem;
    min-height: calc(100vh - 6.5rem);
    padding: 2.5rem 0 3rem;
}

.login-card--signin {
    width: min(100%, 28rem);
    box-shadow: 0 24px 60px rgb(11 34 68 / 0.1);
}

html[data-ub-theme="night"] .login-card--signin {
    box-shadow: 0 28px 70px rgb(0 0 0 / 0.38);
    border-color: var(--card-border);
}

.login-card-body--signin {
    padding: 1.5rem 1.75rem 0.25rem;
}

.google-sign-in-btn--prominent {
    min-height: 3rem;
    border-radius: var(--radius-md);
    font-size: 0.92rem;
    box-shadow: 0 4px 14px rgb(60 64 67 / 0.12);
}

.google-sign-in-btn--prominent:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 22px rgb(60 64 67 / 0.16);
}

html[data-ub-theme="night"] .google-sign-in-btn--prominent {
    box-shadow: 0 6px 18px rgb(0 0 0 / 0.28);
}

html[data-ub-theme="night"] .google-sign-in-btn--prominent:hover {
    box-shadow: 0 10px 26px rgb(0 0 0 / 0.36);
}

.login-screen--google {
    gap: 1rem;
}

.login-card--google {
    width: min(100%, 24rem);
    padding: 2rem 2rem 1.75rem;
    text-align: center;
    border-radius: 0.5rem;
    border: 1px solid #dadce0;
    box-shadow: 0 1px 3px rgb(60 64 67 / 0.12), 0 4px 8px rgb(60 64 67 / 0.06);
    background: var(--card-bg);
}

.login-google-head {
    margin-bottom: 1.35rem;
}

.login-google-logo {
    margin: 0 auto 1rem;
    border-radius: 50%;
}

.login-google-title {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: -0.01em;
    color: var(--heading);
}

.login-google-subtitle {
    margin: 0.35rem 0 0;
    font-size: 0.95rem;
    color: var(--muted);
}

.login-google-subtitle strong {
    color: var(--heading);
    font-weight: 600;
}

.login-google-status {
    margin: 0 0 1rem;
    font-size: 0.85rem;
    line-height: 1.45;
    color: var(--mark);
}

.login-google-note {
    margin: 1.15rem 0 0;
    font-size: 0.78rem;
    line-height: 1.5;
    color: var(--muted);
}

.signup-card--google {
    text-align: center;
}

.signup-card--google .lead {
    margin-bottom: 1.25rem;
}

.login-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    min-height: calc(100vh - 12rem);
    padding: 2rem 0 3rem;
}

.login-card {
    width: min(100%, 26rem);
    border: 1px solid var(--line);
    border-radius: calc(var(--radius-lg) + 0.25rem);
    background:
        linear-gradient(180deg, rgb(255 255 255 / 0.04), transparent 40%),
        var(--card-bg);
    box-shadow: var(--shadow);
    overflow: hidden;
}

html[data-ub-theme="night"] .login-card {
    background:
        linear-gradient(180deg, rgb(255 255 255 / 0.03), transparent 42%),
        var(--card-bg);
}

.login-card-top {
    padding: 2rem 1.75rem 1.25rem;
    text-align: center;
    background: linear-gradient(180deg, var(--hero-1), transparent);
    border-bottom: 1px solid var(--line);
}

.login-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    margin-bottom: 1.35rem;
}

.login-brand-logo {
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 0.85rem;
    box-shadow: 0 8px 20px rgb(11 34 68 / 0.12);
}

.login-brand-name {
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--heading);
}

.login-title {
    font-size: clamp(1.45rem, 4vw, 1.75rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.15;
}

.login-lead {
    margin-top: 0.65rem;
    font-size: 0.92rem;
    line-height: 1.6;
    color: var(--muted);
}

.login-class-chip {
    display: inline-flex;
    margin-top: 0.85rem;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    background: var(--hover);
    border: 1px solid var(--hover-border);
    color: var(--brand-bright);
    font-size: 0.78rem;
    font-weight: 700;
}

.login-card-body {
    padding: 1.35rem 1.75rem 0.5rem;
}

.login-google-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: 100%;
    min-height: 3.1rem;
    padding: 0.75rem 1rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--card-bg);
    color: var(--heading);
    font-size: 0.95rem;
    font-weight: 700;
    box-shadow: 0 2px 8px rgb(11 34 68 / 0.06);
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.login-google-btn:hover {
    transform: translateY(-1px);
    border-color: var(--hover-border);
    background: var(--hover);
    box-shadow: 0 10px 24px rgb(11 34 68 / 0.1);
}

html[data-ub-theme="night"] .login-google-btn {
    box-shadow: 0 2px 10px rgb(0 0 0 / 0.22);
}

html[data-ub-theme="night"] .login-google-btn:hover {
    box-shadow: 0 12px 28px rgb(0 0 0 / 0.32);
}

.login-google-icon {
    display: inline-flex;
    flex-shrink: 0;
    width: 1.25rem;
    height: 1.25rem;
}

.login-google-icon svg {
    display: block;
    width: 100%;
    height: 100%;
}

.login-perks {
    display: grid;
    gap: 0.75rem;
    margin: 1.35rem 0 0;
    padding: 0;
    list-style: none;
}

.login-perks li {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    font-size: 0.84rem;
    line-height: 1.45;
    color: var(--muted);
}

.login-perk-icon {
    display: inline-flex;
    flex-shrink: 0;
    align-items: center;
    justify-content: center;
    width: 1.35rem;
    height: 1.35rem;
    margin-top: 0.05rem;
    border-radius: 999px;
    background: var(--pass-bg);
    color: var(--pass);
}

.login-perk-icon svg {
    width: 0.75rem;
    height: 0.75rem;
}

.login-footnote {
    margin: 0;
    padding: 1rem 1.75rem 1.35rem;
    border-top: 1px solid var(--line);
    font-size: 0.78rem;
    line-height: 1.5;
    text-align: center;
    color: var(--muted);
}

.onboarding-screen {
    min-height: calc(100vh - 10rem);
}

.onboarding-card {
    width: min(100%, 32rem);
}

.onboarding-profile {
    display: grid;
    gap: 0.65rem;
    margin: 0;
    padding: 1.1rem 1.75rem;
    border-bottom: 1px solid var(--line);
    background: var(--hero-1);
}

.onboarding-profile-row {
    display: grid;
    gap: 0.15rem;
}

.onboarding-label {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--muted);
}

.onboarding-profile-row strong {
    font-size: 0.95rem;
    color: var(--heading);
    word-break: break-word;
}

.onboarding-form {
    padding: 1.25rem 1.75rem 1.5rem;
    display: grid;
    gap: 1.1rem;
}

.onboarding-field {
    margin: 0;
}

.onboarding-class-fieldset {
    margin: 0;
    padding: 0;
    border: 0;
}

.onboarding-class-legend {
    margin-bottom: 0.85rem;
    font-size: 0.92rem;
    font-weight: 800;
    color: var(--heading);
}

.onboarding-class-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.55rem;
}

.onboarding-class-option {
    position: relative;
    cursor: pointer;
}

.onboarding-class-option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.onboarding-class-option span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: var(--tap);
    padding: 0.55rem 0.35rem;
    border: 2px solid var(--line);
    border-radius: 0.75rem;
    background: var(--card-bg);
    color: var(--ink);
    font-size: 0.88rem;
    font-weight: 700;
    transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease;
}

.onboarding-class-option input:focus-visible + span {
    outline: 2px solid var(--brand-bright);
    outline-offset: 2px;
}

.onboarding-class-option input:checked + span {
    border-color: var(--brand-bright);
    background: var(--hover);
    color: var(--brand-bright);
    box-shadow: 0 8px 20px rgb(26 115 232 / 0.16);
}

.onboarding-class-option:hover span {
    border-color: var(--hover-border);
    background: var(--hover);
}

.onboarding-submit {
    margin-top: 1.15rem;
    min-height: var(--tap);
    border-color: #1a73e8;
    background: #1a73e8;
    color: var(--on-accent);
    box-shadow: 0 10px 24px rgb(26 115 232 / 0.28);
}

.onboarding-submit:hover {
    background: var(--brand-bright-hover);
    border-color: var(--brand-bright-hover);
    color: var(--white);
}

.onboarding-error {
    margin-top: 0.75rem;
}

.login-back {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    min-height: var(--tap);
    padding: 0.55rem 1rem;
    border-radius: 999px;
    color: var(--link);
    font-size: 0.95rem;
    font-weight: 700;
    transition: color 0.18s ease, background 0.18s ease;
}

.login-back:hover {
    color: var(--ink);
    background: var(--hover);
}

.or-line {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin: 0.75rem 0;
    color: var(--muted);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
.or-line::before,
.or-line::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--line);
}
.student-fields { display: grid; gap: 1rem; }
.field { display: grid; gap: 0.4rem; font-size: 0.85rem; font-weight: 600; color: var(--ink); }
.field input,
.field select {
    width: 100%;
    min-height: var(--tap);
    border: 2px solid var(--line);
    border-radius: 0.75rem;
    padding: 0.75rem 0.9rem;
    background: var(--card-bg);
    color: var(--ink);
}
.field input:focus,
.field select:focus {
    outline: 2px solid var(--brand-bright);
    outline-offset: 1px;
}
.field-error { color: var(--mark); font-weight: 600; }
.student-gate .btn-primary { width: 100%; margin-top: 0.5rem; }

@media (min-width: 1024px) {
    .class-grid { gap: 0.5rem; }
    .class-box { min-height: 5.85rem; }
    .class-box-visual { padding: 0.5rem 0.25rem 0.45rem; gap: 0.25rem; }
    .class-box-label { font-size: 0.74rem; }
    .class-box-book { max-width: 2.35rem; max-height: 2.75rem; }
}

@media (max-width: 960px) {
    .exam-layout { grid-template-columns: 1fr; }
    .subject-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .chapter-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .mock-history-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .subject-mock-card { width: 100%; }
}

@media (max-width: 920px) {
    .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem; }
    .desk-stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .score-grid { grid-template-columns: 1fr; }
    .class-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 0.5rem;
        overflow: visible;
    }
    .class-box { min-height: 5.25rem; flex-shrink: 0; }
    .class-box-book { max-width: 1.85rem; max-height: 2.15rem; }
    .exam-brief-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 920px) {
    :root {
        --site-gutter: 0.75rem;
        --content-gutter: 1.25rem;
    }

    .site {
        overflow-x: clip;
        padding-bottom: calc(4.6rem + env(safe-area-inset-bottom, 0));
    }
    body { overflow-x: clip; }

    .mobile-bottom-nav {
        position: fixed;
        right: 0;
        bottom: 0;
        left: 0;
        z-index: 90;
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        min-height: 4.6rem;
        padding: 0.35rem max(0.5rem, env(safe-area-inset-right, 0))
            calc(0.35rem + env(safe-area-inset-bottom, 0))
            max(0.5rem, env(safe-area-inset-left, 0));
        border-top: 1px solid var(--ub-line);
        background: var(--ub-card);
        box-shadow: 0 -8px 24px rgb(15 23 42 / 0.1);
    }
    .mobile-bottom-nav-link {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 0.15rem;
        min-width: 0;
        min-height: 3.75rem;
        padding: 0.3rem 0.4rem;
        border: 0;
        border-radius: 0.75rem;
        background: transparent;
        color: var(--muted);
        font-size: 0.72rem;
        font-weight: 800;
        line-height: 1.1;
        text-align: center;
        cursor: pointer;
        list-style: none;
    }
    .mobile-bottom-nav-link.is-active {
        background: var(--ub-sky);
        color: var(--ub-blue);
    }
    .mobile-bottom-nav-icon {
        font-size: 1.7rem;
        line-height: 1;
    }
    .mobile-bottom-account {
        position: relative;
        min-width: 0;
    }
    .mobile-bottom-account > summary {
        width: 100%;
        height: 100%;
    }
    .mobile-bottom-account > summary::-webkit-details-marker { display: none; }
    .mobile-bottom-avatar {
        width: 1.75rem;
        height: 1.75rem;
        border-radius: 50%;
        object-fit: cover;
    }
    .mobile-bottom-account-menu {
        position: absolute;
        right: 0.25rem;
        bottom: calc(100% + 0.75rem);
        z-index: 95;
        display: grid;
        gap: 0.25rem;
        width: min(17rem, calc(100vw - 1.5rem));
        padding: 0.4rem;
        border: 1px solid var(--ub-line);
        border-radius: 0.8rem;
        background: var(--ub-card);
        box-shadow: var(--ub-shadow);
    }
    .submit-modal { z-index: 120; }
    .ub-nav-actions > .header-account,
    .ub-nav-actions > .header-login {
        display: none;
    }

    .login-screen {
        min-height: calc(100vh - 10rem);
        padding: 1.25rem var(--site-gutter) 2rem;
    }

    .login-card-top,
    .login-card-body {
        padding-inline: 1.25rem;
    }

    .login-footnote {
        padding-inline: 1.25rem;
    }

    .onboarding-profile,
    .onboarding-form {
        padding-inline: 1.25rem;
    }

    .onboarding-class-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .ub-nav-inner { padding: 0 12px; gap: 6px; }
    .ub-nav-actions { gap: 6px; }
    .nav-student { max-width: 7rem; font-size: 0.85rem; }
    .ub-channels-slot:not(.is-mobile-home-page),
    .ub-quick--after:not(.is-mobile-home-page),
    .ub-footer:not(.is-mobile-home-page) { display: none; }
    .ub-footer { padding-bottom: env(safe-area-inset-bottom, 0); }

    .header-user {
        max-width: 7.5rem;
    }

    .header-avatar {
        width: 24px;
        height: 24px;
    }

    .header-logout,
    .header-login {
        padding: 0.32rem 0.55rem;
        font-size: 0.72rem;
    }

    .header-theme-toggle {
        padding: 0.32rem 0.55rem;
        font-size: 0.72rem;
        gap: 0.28rem;
    }

    .header-class-picker select {
        min-width: 5.75rem;
        max-width: 7.5rem;
        min-height: var(--tap);
        font-size: 0.88rem;
    }

    .flash {
        padding: 0.65rem 0.75rem;
        font-size: 0.9rem;
    }

    .dashboard-band { padding: 0.65rem 0 0.75rem; }
    .dashboard-head { gap: 0.35rem; margin-bottom: 0.45rem; }
    .dashboard-title { font-size: 1.05rem; }
    .dashboard-take-test {
        display: flex;
        width: 100%;
        gap: 0.7rem;
        padding: 0.85rem 0.9rem;
        align-items: flex-start;
    }
    .dashboard-take-test-icon {
        width: 2.45rem;
        height: 2.45rem;
        border-radius: 0.75rem;
    }
    .dashboard-take-test-icon svg {
        width: 1.2rem;
        height: 1.2rem;
    }
    .dashboard-take-test-title { font-size: 1.02rem; }
    .dashboard-take-test-free {
        font-size: 0.6rem;
        padding: 0.1rem 0.42rem;
    }
    .dashboard-take-test-copy {
        font-size: 0.8rem;
        line-height: 1.4;
    }
    .dashboard-take-test-meta { gap: 0.28rem; }
    .dashboard-take-test-meta > span {
        padding: 0.18rem 0.48rem;
        font-size: 0.66rem;
    }
    .dashboard-take-test-go {
        align-self: center;
        min-height: 2rem;
        padding: 0.22rem 0.6rem;
        font-size: 0.74rem;
    }
    .dashboard-band.is-mobile-recent-only .dashboard-head,
    .dashboard-band.is-mobile-recent-only .desk-overview,
    .dashboard-band.is-mobile-recent-only .dashboard-take-test {
        display: none;
    }
    .dashboard-band.is-mobile-recent-only .subjects-mock-wrap,
    .dashboard-band.is-mobile-recent-only .recent-activity-title {
        margin-top: 0;
    }

    .hero { padding: 0.85rem 0 1rem; }
    .hero-grid { padding: 0.2rem 0 0.35rem; }
    .seo-band { padding: 1.1rem 0 1.4rem; }
    .seo-copy .section-title { margin-top: 1.35rem; }
    .seo-faq h3 { font-size: 1rem; }
    .section-title { font-size: 1.2rem; line-height: 1.25; }

    .class-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 0.45rem;
    }
    .class-box { min-height: 5.5rem; }
    .class-box-visual {
        padding: 0.45rem 0.2rem 0.4rem;
        gap: 0.2rem;
    }
    .class-box-label {
        font-size: clamp(0.72rem, 3vw, 0.85rem);
        line-height: 1.1;
        white-space: normal;
    }
    .class-box-book { max-width: 1.9rem; max-height: 2.2rem; }

    .subjects-band { padding: 0.75rem 0 0.9rem; }
    .subject-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.6rem; margin-top: 0.65rem; }
    .subject-card-title { flex-direction: row; align-items: center; gap: 0.4rem; }
    .subject-card-title h2 { overflow-wrap: anywhere; font-size: 1rem; }
    .subject-explore-btn {
        width: auto;
        margin-left: 0;
        min-height: 1.75rem;
        padding: 0.16rem 0.5rem;
        font-size: 0.7rem;
        justify-content: center;
        align-self: center;
    }

    .chapter-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.6rem; }
    .chapter-grid .card { width: 100%; min-height: 0; }
    .chapter-grid .chapter-card {
        flex-direction: row;
        align-items: center;
        gap: 0.45rem;
    }
    .chapter-card-action { align-self: center; }
    .chapter-grid .chapter-card-start-btn {
        width: auto;
        min-width: 3.1rem;
        min-height: 1.9rem;
        padding: 0.18rem 0.55rem;
        font-size: 0.72rem;
    }
    .chapter-card-stats {
        gap: 0.28rem;
        margin-top: 0.4rem;
    }
    .chapter-card-stats span {
        padding: 0.14rem 0.4rem;
        font-size: 0.66rem;
    }
    .chapter-card-foot { flex-wrap: wrap; gap: 0.35rem; }
    .subject-kicker,
    .exam-brief-title,
    .mock-history-card h2,
    .result-q-text,
    .result-option span,
    .desk-stat strong {
        max-width: 100%;
        overflow-wrap: anywhere;
        word-break: normal;
    }

    .subject-mock-card {
        flex-direction: row;
        align-items: center;
        gap: 0.75rem;
        max-width: none;
        padding: 1.15rem 1.1rem;
    }
    .subject-mock-action {
        align-self: center;
        margin-top: 0;
    }

    .desk-overview { grid-template-columns: 1fr; gap: 0.35rem; }
    .desk-overview-split { grid-template-columns: 1fr 1fr; gap: 0.35rem; }
    .desk-stats {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 0;
    }
    .desk-stat span {
        font-size: 0.62rem;
        letter-spacing: 0.04em;
    }
    .desk-stat strong {
        font-size: 0.92rem;
        overflow-wrap: break-word;
        word-break: normal;
        line-height: 1.25;
    }
    .desk-panel-inline { padding: 0.65rem 0.75rem; }
    .desk-mock-panel { padding: 0.65rem 0.75rem; }
    .mock-history-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0.55rem;
    }
    .mock-history-card {
        width: 100%;
        padding: 0.8rem 0.8rem 0.75rem;
        gap: 0.35rem;
        border-radius: 0.9rem;
    }
    .mock-history-card h2 {
        font-size: 0.9rem;
        line-height: 1.3;
    }
    .mock-history-meta { font-size: 0.74rem; gap: 0.45rem; }
    .mock-history-details { gap: 0.28rem; }
    .mock-history-details > span {
        padding: 0.14rem 0.42rem;
        font-size: 0.66rem;
    }
    .mock-history-action-row {
        flex-wrap: wrap;
        gap: 0.3rem 0.4rem;
    }
    .mock-history-cta {
        min-height: 1.7rem;
        padding: 0.16rem 0.55rem;
        font-size: 0.68rem;
    }
    .mock-history-status { font-size: 0.64rem; padding: 0.16rem 0.45rem; }
    .mock-history-score { font-size: 0.7rem; min-width: 2.4rem; }

    .page { padding: 0.75rem 0 1rem; }
    .page-title { font-size: 1.15rem; line-height: 1.3; }
    .lead { font-size: 0.92rem; line-height: 1.45; }

    .card { padding: 0.85rem 0.95rem; }
    .btn {
        min-height: var(--tap);
        padding: 0.75rem 1.15rem;
        font-size: 1rem;
    }
    .actions {
        flex-direction: column;
        gap: 0.5rem;
    }
    .actions .btn,
    .actions form,
    .actions form .btn {
        width: 100%;
    }

    .exam-brief { padding: 1rem; }
    .exam-brief-actions {
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        justify-content: flex-start;
        gap: 0.45rem;
    }
    .exam-brief-actions form,
    .exam-brief-actions > .btn {
        flex: 0 0 auto;
        width: auto;
        min-width: 0;
    }
    .exam-brief-actions form { display: inline-flex; }
    .exam-brief-actions form .btn,
    .exam-brief-actions > .btn {
        width: auto;
        flex: 0 0 auto;
        min-height: 2.25rem;
        justify-content: center;
        padding: 0.32rem 0.7rem;
        font-size: 0.82rem;
        white-space: nowrap;
    }
    .btn-start-exam {
        justify-content: center;
        min-height: 2.25rem;
        padding: 0.32rem 0.8rem;
        font-size: 0.84rem;
    }
    .exam-brief-back {
        min-height: 2.25rem;
        padding-inline: 0.65rem;
    }
    .exam-features { grid-template-columns: 1fr; gap: 0.75rem; }

    .student-fields { grid-template-columns: 1fr !important; gap: 0.85rem; }
    .field input,
    .field select { padding: 0.7rem 0.85rem; font-size: 1rem; }

    .meta.box { grid-template-columns: 1fr 1fr; gap: 0.6rem; padding: 0.85rem; }
    .meta.box .note { grid-column: 1 / -1; }

    .exam-bar {
        flex-direction: column;
        align-items: stretch;
        padding: 0.85rem;
        margin-bottom: 0.85rem;
        gap: 0.65rem;
    }
    .exam-bar h1 {
        font-size: 1.05rem;
        line-height: 1.35;
        word-break: break-word;
    }
    .exam-bar .header-actions {
        width: 100%;
        margin-left: 0;
        justify-content: space-between;
        flex-wrap: wrap;
    }

    .exam-paper { padding: 0.85rem; }
    .question .kicker {
        min-height: 1.85rem;
        padding-right: 3.6rem;
        display: flex;
        align-items: center;
    }
    .exam-paper:has(#hint-btn.is-hidden) .question .kicker {
        padding-right: 0;
        min-height: 0;
        display: block;
    }
    .question h2 {
        font-size: 1.05rem;
        line-height: 1.45;
        overflow-wrap: anywhere;
        word-break: normal;
    }
    .choice {
        padding: 0.85rem 0.9rem;
        min-height: var(--tap);
    }
    .choice span { line-height: 1.4; overflow-wrap: anywhere; word-break: normal; }

    .exam-nav {
        flex-direction: row;
        align-items: stretch;
        gap: 0.5rem;
        margin-top: 1.25rem;
    }
    .exam-nav .btn { width: 100%; min-height: var(--tap); min-width: 0; }
    #prev-btn,
    #next-btn { flex: 1 1 0; }
    #hint-btn:not(.is-hidden) {
        top: 0.75rem;
        right: 0.75rem;
        width: auto;
        min-width: 0;
        min-height: 1.65rem;
        padding: 0.14rem 0.48rem;
        font-size: 0.68rem;
    }
    #prev-btn {
        background: var(--brand-bright);
        border-color: var(--brand-bright);
        color: var(--on-accent);
    }
    .btn-submit-exam {
        width: auto;
        min-width: 9.5rem;
        max-width: 12.5rem;
        margin-inline: auto;
        padding-inline: 1.15rem;
        justify-self: center;
    }

    .palette {
        order: 0;
        padding: 0.85rem;
        position: static;
        z-index: 5;
    }
    .palette-grid {
        grid-template-columns: repeat(5, minmax(0, 1fr));
        gap: 0.35rem;
        max-height: 14rem;
        overflow-y: auto;
        overscroll-behavior: contain;
    }
    .palette-btn { min-height: var(--tap); font-size: 0.88rem; }
    .palette-progress {
        flex: 1 1 100%;
        margin-left: 0;
        text-align: center;
        white-space: normal;
    }
    .palette-legend { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .palette-legend-review { grid-column: 1; }
    .palette-legend.result-legend {
        flex-wrap: wrap;
        gap: 0.45rem 0.55rem;
    }
    .result-legend li { font-size: 0.68rem; white-space: normal; }

    .submit-card {
        padding: 1.15rem 1.05rem 1rem;
        max-height: calc(100dvh - 2rem);
        overflow: auto;
    }
    .submit-card h2 { font-size: 1.2rem; }
    .exam-dialog-icon {
        width: 2.65rem;
        height: 2.65rem;
        margin-bottom: 0.7rem;
    }
    .submit-stats { grid-template-columns: 1fr 1fr; }
    .submit-stats dd { font-size: 1.4rem; }
    .submit-actions { flex-direction: column; }
    .submit-actions .btn { width: 100%; flex: 1 1 auto; }

    .score-grid { gap: 0.75rem; }
    .score-ring { min-height: 8rem; border-radius: 1rem; }
    .score-ring.score-breakdown { padding: 1rem 0.85rem; }
    .score-breakdown-grid { gap: 0.75rem 0.5rem; }
    .score-breakdown-grid dd { font-size: 1.15rem; }
    .result-accuracy-head strong { font-size: 1.65rem; }
    .result-donut { width: 8rem; height: 8rem; }
    .result-donut-hole strong { font-size: 1.15rem; }
    .result-rank-line strong { font-size: 1.4rem; }

    .result-review-head {
        flex-direction: column;
        align-items: stretch;
    }

    .result-review-toolbar {
        flex-wrap: nowrap;
        align-items: stretch;
        width: 100%;
        margin-left: 0;
        gap: 0.35rem;
        overflow-x: auto;
        overscroll-behavior-x: contain;
    }

    .result-more-tests {
        flex: 0 1 auto;
        width: auto;
        min-width: 0;
        padding-inline: 0.55rem;
        font-size: 0.7rem;
        justify-content: center;
    }

    .result-filters {
        display: flex;
        flex: 1 1 auto;
        flex-wrap: nowrap;
        min-width: 0;
        gap: 0.3rem;
    }

    .result-filter {
        flex: 1 1 0;
        width: auto;
        min-width: 0;
        min-height: var(--tap);
        padding-inline: 0.3rem;
        font-size: 0.68rem;
        text-align: center;
        white-space: nowrap;
    }

    .result-palette {
        position: static;
        order: -1;
    }

    .result-jump-grid {
        grid-template-columns: repeat(5, minmax(0, 1fr));
        max-height: 14rem;
        overflow-y: auto;
        overscroll-behavior: contain;
    }

    .result-nav {
        flex-direction: row;
        flex-wrap: nowrap;
        align-items: stretch;
        gap: 0.5rem;
    }

    .result-nav .btn {
        flex: 1 1 0;
        width: auto;
        min-width: 0;
        justify-content: center;
        padding-inline: 0.65rem;
        font-size: 0.92rem;
        white-space: nowrap;
    }

    .review-jump { grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0.4rem; }
    .review-jump-btn { min-height: var(--tap); font-size: 0.85rem; }

    .key-head { flex-direction: column; align-items: flex-start; gap: 0.35rem; }
    .key-item { scroll-margin-top: 4.5rem; }

    .list li {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
        padding: 0.75rem 1rem;
    }

    .previous-top { flex-direction: column; gap: 0.35rem; }
    .previous-questions { max-height: 10rem; }

    .footer-grid { grid-template-columns: 1fr; gap: 1.1rem; padding: 1.5rem 0 1rem; }
    .footer-copy { padding: 0.75rem 0 calc(0.85rem + env(safe-area-inset-bottom, 0)); }
}

@media (max-width: 1100px) {
    .ub-nav-toggle {
        display: grid;
    }
    .ub-nav-desktop-only { display: none !important; }
    .ub-theme-label { display: none; }
    .ub-theme-toggle { padding: 8px; }
    .ub-nav-cta { display: none; }
    .ub-play-badge--nav { display: none; }
    .ub-nav-links {
        display: none;
    }
    .ub-nav.is-open .ub-nav-links {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        position: absolute;
        left: 0;
        right: 0;
        top: calc(64px + env(safe-area-inset-top, 0px));
        background: var(--ub-card);
        padding: 12px 16px 18px;
        border-bottom: 1px solid var(--ub-line);
        box-shadow: var(--ub-shadow);
        z-index: 60;
        max-height: calc(100dvh - 64px - env(safe-area-inset-top, 0px));
        overflow-y: auto;
        overscroll-behavior: contain;
        -webkit-overflow-scrolling: touch;
    }
    .ub-nav.is-open .ub-nav-links a {
        min-height: var(--tap);
        padding: 12px 14px;
        font-size: 1rem;
        border-radius: 12px;
    }
    .ub-nav.is-open .ub-nav-links a.ub-play-badge {
        min-height: 0;
        padding: 6px 0;
        border-radius: 0;
        justify-content: flex-start;
    }
    .ub-nav.is-open .ub-nav-links a.ub-play-badge:hover,
    .ub-nav.is-open .ub-nav-links a.ub-play-badge.is-active {
        background: transparent !important;
    }
    .ub-nav.is-open .ub-nav-links .ub-play-badge img {
        height: 44px;
    }
    .ub-nav.is-open .ub-nav-links .ub-nav-mobile-bottom-link {
        display: none;
    }
    .ub-nav-mobile-item {
        display: flex;
        align-items: center;
        min-height: 0;
        padding: 4px 14px;
    }
    .ub-footer-grid {
        grid-template-columns: 1fr 1fr;
        padding-top: 32px;
    }
}

@media (max-width: 480px) {
    .ub-nav-inner { padding-inline: 8px; gap: 4px; }
    .ub-brand { gap: 0; font-size: 0; }
    .ub-brand img { font-size: initial; }
    .ub-nav-actions { gap: 4px; }
    .ub-nav-cta { padding: 8px 12px; font-size: 0.82rem; }
    .ub-nav-login.header-login { padding: 8px 10px; font-size: 0.78rem; }
    .header-class-picker select {
        width: 4.9rem;
        min-width: 4.9rem;
        max-width: 4.9rem;
        padding-inline: 0.55rem 1.25rem;
        font-size: 0.78rem;
    }
    .class-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 0.45rem;
    }
    .class-box { min-height: 5.75rem; }
    .class-box-label { font-size: 0.82rem; }
    .login-perks li { font-size: 0.9rem; line-height: 1.5; }
    .seo-copy p,
    .seo-copy li { font-size: 0.94rem; line-height: 1.65; }
    .seo-faq-card { padding: 0.85rem 0.9rem; }
    .ub-footer-social-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    .ub-footer-grid { grid-template-columns: 1fr; }
}

@media (max-width: 400px) {
    .class-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 0.4rem;
    }
    .class-box { min-height: 5.5rem; }
    .meta.box { grid-template-columns: 1fr; }
    .desk-overview-split { grid-template-columns: 1fr; }
    .submit-stats { grid-template-columns: 1fr; }
    .review-jump { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 641px) {
    .student-fields { grid-template-columns: 1fr 8rem 10rem; }
}

@media (min-width: 640px) {
    .grid-2 { grid-template-columns: 1fr 1fr; }
    .footer-inner { flex-direction: row; align-items: center; }
    .score-grid { grid-template-columns: 1fr 1fr; }
    .score-grid .score-ring { aspect-ratio: unset; height: 100%; }
    .score-breakdown-grid > div:nth-child(4),
    .score-breakdown-grid > div:nth-child(5) {
        grid-column: auto;
    }
}

@media (min-width: 768px) {
    .nav { display: flex; }
}

@media (min-width: 960px) {
    .exam-layout { grid-template-columns: minmax(0, 1fr) minmax(240px, 280px); }
    .palette { position: static; }
}

html[data-ub-theme="night"] .btn-ghost {
    color: var(--ink);
}
html[data-ub-theme="night"] .btn-back-subjects {
    background: var(--brand-bright);
    color: #07101c;
}
html[data-ub-theme="night"] .btn-back-subjects:hover {
    background: #9cc4ff;
    color: #07101c;
}
html[data-ub-theme="night"] .btn-outline {
    border-color: var(--hover-border);
    color: var(--ink);
    background: var(--card-bg);
}
@media (max-width: 920px) {
    html[data-ub-theme="night"] #prev-btn {
        background: var(--brand-bright);
        border-color: var(--brand-bright);
        color: var(--on-accent);
    }
}
html[data-ub-theme="night"] .link,
html[data-ub-theme="night"] .login-back {
    color: var(--link);
}
html[data-ub-theme="night"] a.ub-nav-cta,
html[data-ub-theme="night"] .ub-nav-login,
html[data-ub-theme="night"] .header-login,
html[data-ub-theme="night"] .header-logout,
html[data-ub-theme="night"] .btn-primary,
html[data-ub-theme="night"] .btn-ink,
html[data-ub-theme="night"] .btn-mark,
html[data-ub-theme="night"] .btn-start-exam,
html[data-ub-theme="night"] .btn-submit-exam,
html[data-ub-theme="night"] .chapter-start-btn:not(.is-disabled),
html[data-ub-theme="night"] .subject-explore-btn,
html[data-ub-theme="night"] .mock-history-cta,
html[data-ub-theme="night"] .mock-history-score,
html[data-ub-theme="night"] .app-open-btn-primary,
html[data-ub-theme="night"] .onboarding-submit {
    color: var(--on-accent) !important;
}
html[data-ub-theme="night"] #hint-btn:hover,
html[data-ub-theme="night"] #hint-btn:focus-visible {
    background: #3a2e18;
    border-color: var(--flash-line);
    color: var(--flash-ink);
}
html[data-ub-theme="night"] #hint-btn.is-on {
    background: #f5b942;
    color: #07101c;
}
html[data-ub-theme="night"] #mark-review-btn {
    background: #1a2d4a;
    border-color: rgb(125 179 255 / 0.45);
    color: var(--brand-bright);
}
html[data-ub-theme="night"] #mark-review-btn:hover,
html[data-ub-theme="night"] #mark-review-btn:focus-visible {
    background: #243a5c;
    color: var(--brand-bright);
}
html[data-ub-theme="night"] #mark-review-btn.is-on {
    background: var(--brand-bright);
    border-color: var(--brand-bright);
    color: #07101c;
}
html[data-ub-theme="night"] #clear-answer-btn {
    background: #3a2018;
    border-color: rgb(255 177 153 / 0.45);
    color: var(--mark);
}
html[data-ub-theme="night"] #clear-answer-btn:hover,
html[data-ub-theme="night"] #clear-answer-btn:focus-visible {
    background: #4a2a20;
    color: var(--mark);
}
html[data-ub-theme="night"] .exam-dialog {
    background:
        radial-gradient(circle at 100% 0%, rgb(125 179 255 / 0.16), transparent 42%),
        var(--card-bg);
    box-shadow: 0 24px 64px rgb(0 0 0 / 0.5);
}
html[data-ub-theme="night"] .exam-dialog--leave {
    background:
        radial-gradient(circle at 0% 0%, rgb(125 179 255 / 0.2), transparent 44%),
        var(--card-bg);
}
html[data-ub-theme="night"] .exam-dialog--submit .exam-dialog-icon {
    color: var(--mark);
}
html[data-ub-theme="night"] .submit-stat.is-answered dd { color: var(--pass); }
html[data-ub-theme="night"] .submit-stat.is-unanswered dd { color: var(--mark); }
html[data-ub-theme="night"] .exam-dialog-secondary.btn-outline {
    background: transparent;
    color: var(--brand-bright);
}
html[data-ub-theme="night"] .exam-dialog-primary.btn-mark {
    background: var(--start-bg);
    color: var(--on-accent);
}
html[data-ub-theme="night"] .exam-dialog-primary.btn-mark:hover {
    background: var(--start-hover);
    color: #07101c;
}

.ub-channels-slot {
    padding: 1rem 0 0.35rem;
}

.ub-social-grid {
    display: grid;
    gap: 0.75rem;
}

.ub-social-grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.ub-social {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    border-radius: 1rem;
    padding: 0.85rem 1rem;
    text-decoration: none !important;
    border: 1px solid var(--line);
    color: var(--ink);
    transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.ub-social:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.ub-social span {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    color: var(--heading);
}

.ub-social span svg {
    flex-shrink: 0;
    display: block;
}

.ub-social--wa span svg { color: #25d366; }
.ub-social--tg span svg { color: #229ed9; }
.ub-social--fb span svg { color: #0866ff; }

.ub-social em {
    font-style: normal;
    font-size: 0.82rem;
    font-weight: 700;
    background: var(--navy);
    color: #fff;
    padding: 0.45rem 0.75rem;
    border-radius: 999px;
    white-space: nowrap;
}

.ub-social--wa { background: #f1fff6; }
.ub-social--tg { background: #eef7ff; }
.ub-social--fb { background: #eef3ff; }

html[data-ub-theme="night"] .ub-social--wa {
    background: #143126;
    border-color: #1f4a38;
}

html[data-ub-theme="night"] .ub-social--tg {
    background: #12283c;
    border-color: #1c3d5c;
}

html[data-ub-theme="night"] .ub-social--fb {
    background: #152238;
    border-color: #27406a;
}

html[data-ub-theme="night"] .ub-social span {
    color: #eaf0fa;
}

html[data-ub-theme="night"] .ub-social em {
    background: #1a73e8;
    color: #ffffff;
}

.ub-quick--after {
    padding: 0.65rem 0 1.5rem;
}

.hero + .ub-channels-slot,
.subjects-band + .ub-channels-slot,
.dashboard-band + .ub-channels-slot {
    padding-top: 0.35rem;
}

.subject-page .ub-channels-slot {
    padding: 1.25rem 0 0.35rem;
}

.subject-page .ub-quick--after {
    padding: 0.5rem 0 1.25rem;
}

.exam-ready-page .ub-channels-slot {
    padding: 1.25rem 0 0.35rem;
}

.exam-ready-page .ub-quick--after {
    padding: 0.5rem 0 1.35rem;
}

.ub-quick-kicker {
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 0.75rem;
}

.ub-quick-grid {
    display: grid;
    grid-template-columns: repeat(9, minmax(0, 1fr));
    gap: 0.5rem;
}

.ub-quick-card {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 0.75rem 0.4rem 0.65rem;
    text-align: center;
    text-decoration: none !important;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--card-border);
    color: inherit;
    min-width: 0;
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.ub-quick-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
    border-color: var(--hover-border);
}

.ub-quick-card .ub-qicon {
    width: 2.6rem;
    height: 2.6rem;
    margin: 0 auto 0.45rem;
    border-radius: 0.75rem;
    display: grid;
    place-items: center;
    color: #fff;
}

.ub-quick-card .ub-qicon svg {
    display: block;
    width: 1.15rem;
    height: 1.15rem;
}

.ub-quick-card h3 {
    font-size: 0.72rem;
    font-weight: 800;
    color: var(--heading);
    margin: 0 0 0.15rem;
    line-height: 1.2;
}

.ub-quick-card p {
    margin: 0;
    font-size: 0.62rem;
    line-height: 1.25;
    color: var(--muted);
}

.ub-c-blue { background: linear-gradient(180deg, #3b8cff, #1a73e8); }
.ub-c-teal { background: linear-gradient(180deg, #22c3af, #0f9d8a); }
.ub-c-coral { background: linear-gradient(180deg, #ff8a62, #ff6a3d); }
.ub-c-gold { background: linear-gradient(180deg, #ffd36a, #f0b429); }
.ub-c-purple { background: linear-gradient(180deg, #8b7cff, #635bff); }
.ub-c-navy { background: linear-gradient(180deg, #2b4d7a, #0b2244); }
.ub-c-mint { background: linear-gradient(180deg, #34d399, #059669); }
.ub-c-pink { background: linear-gradient(180deg, #fb7185, #e11d48); }
.ub-c-indigo { background: linear-gradient(180deg, #818cf8, #4f46e5); }

@media (max-width: 920px) {
    .ub-quick-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 0.65rem;
    }
    .ub-quick-card {
        padding: 0.95rem 0.7rem 0.85rem;
    }
    .ub-quick-card .ub-qicon {
        width: 3.25rem;
        height: 3.25rem;
        margin-bottom: 0.6rem;
        border-radius: 0.9rem;
    }
    .ub-quick-card .ub-qicon svg {
        width: 1.4rem;
        height: 1.4rem;
    }
    .ub-quick-card h3 {
        font-size: 0.88rem;
    }
    .ub-quick-card p {
        font-size: 0.72rem;
    }
}

body.app-open-sheet-lock {
    overflow: hidden;
}
.app-open-sheet {
    display: none;
}
.app-open-sheet.is-open {
    position: fixed;
    inset: 0;
    z-index: 140;
    display: flex;
    align-items: flex-end;
    justify-content: center;
}
.app-open-backdrop {
    position: absolute;
    inset: 0;
    border: 0;
    padding: 0;
    background: rgb(7 16 28 / 0.48);
    cursor: pointer;
}
.app-open-card {
    position: relative;
    width: min(28rem, 100%);
    border-radius: 1.35rem 1.35rem 0 0;
    background: var(--card-bg);
    padding: 1.15rem 1.2rem calc(1.2rem + env(safe-area-inset-bottom, 0px));
    box-shadow: 0 -12px 40px rgb(11 34 68 / 0.18);
    animation: app-open-up 0.22s ease;
}
.app-open-heading {
    margin: 0 0 1rem;
    text-align: center;
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--heading);
}
.app-open-row {
    display: grid;
    grid-template-columns: 2.75rem minmax(0, 1fr) auto;
    align-items: center;
    gap: 0.85rem;
    min-height: 3.5rem;
}
.app-open-row + .app-open-row {
    margin-top: 0.35rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--line);
}
.app-open-icon {
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 0.7rem;
    object-fit: cover;
    background: var(--card-bg);
}
.app-open-browser-icon {
    display: grid;
    place-items: center;
    border-radius: 999px;
    overflow: hidden;
    box-shadow: 0 0 0 1px var(--line);
}
.app-open-browser-icon svg {
    width: 2.75rem;
    height: 2.75rem;
}
.app-open-name {
    font-size: 1.02rem;
    font-weight: 800;
    color: var(--heading);
}
.app-open-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 5.6rem;
    min-height: 2.35rem;
    padding: 0.4rem 1.05rem;
    border: 0;
    border-radius: 999px;
    font-size: 0.92rem;
    font-weight: 800;
    text-decoration: none;
    cursor: pointer;
}
.app-open-btn-primary {
    background: #1a73e8;
    color: var(--on-accent);
    box-shadow: 0 8px 18px rgb(26 115 232 / 0.28);
}
.app-open-btn-primary:hover {
    background: #1558c0;
    color: var(--on-accent);
}
.app-open-btn-muted {
    background: #e8edf4;
    color: #3a4d63;
}
.app-open-btn-muted:hover {
    background: #dce3ef;
}
@keyframes app-open-up {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: none;
    }
}
@media (min-width: 921px) {
    .app-open-sheet.is-open { display: none; }
}
html[data-ub-theme="night"] .app-open-btn-primary {
    color: var(--on-accent);
}
html[data-ub-theme="night"] .app-open-btn-muted {
    background: #24364f;
    color: var(--ink);
}