/* ============================================================
   英语听力训练平台 - 成熟版设计系统
   参考：学而思 / 猿辅导 / 新东方在线 / Coursera
   设计：层次丰富 / 信息密度高 / 专业可信 / 细节考究
   ============================================================ */

@import url('https://fonts.font.im/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;600;700&display=swap');

:root {
    /* 主色 - 深蓝（沉稳、教育、信赖感）*/
    --color-primary: #1a56c4;
    --color-primary-hover: #1549a3;
    --color-primary-active: #0f3a82;
    --color-primary-light: #e8f0fe;
    --color-primary-lighter: #f3f7ff;
    --color-primary-lightest: #f8fafe;
    --color-primary-border: #b8d0f5;
    --color-primary-50: #f0f5ff;
    --color-primary-100: #dbe8fc;

    /* 辅助色 - 用于强调与区分 */
    --color-accent: #0ea5e9;
    --color-accent-light: #e0f2fe;
    --color-teal: #0d9488;
    --color-teal-light: #ccfbf1;

    /* 语义色 */
    --color-success: #16a34a;
    --color-success-hover: #15803d;
    --color-success-light: #dcfce7;
    --color-success-bg: #f0fdf4;
    --color-success-border: #86efac;
    --color-warning: #d97706;
    --color-warning-hover: #b45309;
    --color-warning-light: #fef3c7;
    --color-warning-bg: #fffbeb;
    --color-warning-border: #fcd34d;
    --color-error: #dc2626;
    --color-error-hover: #b91c1c;
    --color-error-light: #fee2e2;
    --color-error-bg: #fef2f2;
    --color-error-border: #fca5a5;
    --color-info: #2563eb;
    --color-info-light: #dbeafe;
    --color-info-bg: #eff6ff;
    --color-info-border: #93c5fd;

    /* 中性色 - 灰阶系统 */
    --color-text: #0f172a;
    --color-text-soft: #334155;
    --color-text-muted: #64748b;
    --color-text-light: #94a3b8;
    --color-text-disabled: #cbd5e1;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-border-medium: #cbd5e1;
    --color-border-dark: #94a3b8;
    --color-bg: #f1f5f9;
    --color-bg-soft: #e2e8f0;
    --color-bg-card: #ffffff;
    --color-bg-hover: #f8fafc;
    --color-bg-inset: #f1f5f9;
    --color-bg-dark: #0f172a;
    --color-overlay: rgba(15, 23, 42, 0.5);

    /* 渐变 - 极淡、用于细节 */
    --gradient-subtle: linear-gradient(180deg, #fafbff 0%, #f1f5f9 100%);
    --gradient-primary: linear-gradient(135deg, #1a56c4 0%, #2563eb 100%);
    --gradient-hero: linear-gradient(135deg, #0f3a82 0%, #1a56c4 50%, #2563eb 100%);

    /* 字号 */
    --text-xs: 12px;
    --text-sm: 13px;
    --text-base: 14px;
    --text-md: 15px;
    --text-lg: 16px;
    --text-xl: 18px;
    --text-2xl: 20px;
    --text-3xl: 24px;
    --text-4xl: 30px;
    --text-5xl: 36px;

    /* 字重 */
    --fw-normal: 400;
    --fw-medium: 500;
    --fw-semibold: 600;
    --fw-bold: 700;

    /* 间距 - 4px 基准 */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;

    /* 圆角 */
    --radius-xs: 2px;
    --radius-sm: 4px;
    --radius: 6px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-xl: 12px;
    --radius-2xl: 16px;
    --radius-full: 9999px;

    /* 阴影 - 层次化 */
    --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.07), 0 2px 4px -1px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -2px rgba(15, 23, 42, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 10px 10px -5px rgba(15, 23, 42, 0.04);
    --shadow-inner: inset 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-focus: 0 0 0 3px rgba(26, 86, 196, 0.15);

    /* 动效 */
    --transition-fast: 120ms ease-out;
    --transition: 180ms ease-out;
    --transition-slow: 280ms ease-out;

    /* 布局 */
    --container: 1240px;
    --container-narrow: 960px;
    --header-h: 60px;

    /* z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-overlay: 300;
    --z-modal: 400;
    --z-toast: 500;
}

/* ============= 2026 K12 learning workspace ============= */
.site-header__inner {
    display: grid;
    grid-template-columns: minmax(190px, auto) auto minmax(180px, 1fr) auto;
    gap: var(--space-4);
}
.site-header__nav { min-width: 330px; justify-content: center; }
.site-header__nav a { min-height: 38px; white-space: nowrap; }
.site-header__search { justify-self: stretch; max-width: 340px; width: 100%; }
.site-header__user { justify-self: end; }
.header-stage-switch select { height: 34px; min-width: 92px; padding: 4px 26px 4px 8px; border: 1px solid var(--color-border-medium); border-radius: var(--radius-sm); background: #fff; color: var(--color-text-soft); font-size: var(--text-xs); }
.header-basket { position: relative; display: inline-flex; align-items: center; min-height: 34px; }
.header-basket span { position: absolute; top: -5px; right: -7px; min-width: 16px; padding: 1px 4px; border-radius: 9px; background: var(--color-error); color: #fff; font-size: 10px; text-align: center; }
.input-with-action { display: flex; gap: 8px; align-items: stretch; }
.input-with-action input { min-width: 0; flex: 1; }
.home-focus-strip { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(260px, .8fr); gap: var(--space-4); margin: var(--space-5) 0; padding: var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; }
.home-focus-strip__continue { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); padding-right: var(--space-4); border-right: 1px solid var(--color-border-light); }
.home-focus-strip__continue h2 { margin: 3px 0; font-size: var(--text-lg); }
.home-focus-strip__continue p { margin: 0; color: var(--color-text-muted); font-size: var(--text-sm); }
.home-focus-strip__stats { display: grid; grid-template-columns: repeat(3, 1fr); align-items: center; gap: var(--space-3); text-align: center; }
.home-focus-strip__stats div { display: grid; gap: 3px; }
.home-focus-strip__stats strong { color: var(--color-primary-active); font-size: var(--text-xl); font-variant-numeric: tabular-nums; }
.home-focus-strip__stats span, .eyebrow { color: var(--color-text-muted); font-size: var(--text-xs); }
.question-card--listening .question-card__footer { flex-wrap: wrap; }
@media (max-width: 760px) { .home-focus-strip { grid-template-columns: 1fr; } .home-focus-strip__continue { padding-right: 0; padding-bottom: var(--space-3); border-right: 0; border-bottom: 1px solid var(--color-border-light); } .header-stage-switch select { min-width: 88px; } }
.site-header__brand .logo, .mobile-tabbar__fab { background: var(--color-primary); }
.site-footer__col h4, .admin-page-head h1 { letter-spacing: 0; text-transform: none; }
.site-footer__copy { justify-content: flex-start; gap: var(--space-4); }

.home-command {
    position: relative;
    overflow: hidden;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: var(--space-6);
    align-items: stretch;
    margin-bottom: var(--space-5);
    padding: var(--space-7);
    background: linear-gradient(135deg, var(--color-primary-lighter) 0%, var(--color-bg-card) 68%);
    border: 1px solid var(--color-primary-100);
    border-top: 0;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}
.home-command::before { content: ''; position: absolute; width: 260px; height: 260px; top: -150px; right: 300px; border-radius: 50%; background: rgba(37, 99, 235, .06); pointer-events: none; }
.home-command > * { position: relative; z-index: 1; }
.home-command__eyebrow-row { display: flex; align-items: center; flex-wrap: wrap; gap: var(--space-3); }
.home-command__eyebrow { color: var(--color-primary); font-size: var(--text-xs); font-weight: var(--fw-semibold); }
.home-command__eyebrow-note { display: inline-flex; align-items: center; gap: 4px; padding: 4px 8px; border: 1px solid var(--color-primary-border); border-radius: var(--radius-full); background: rgba(255,255,255,.72); color: var(--color-primary-active); font-size: var(--text-xs); }
.home-command h1 { max-width: 620px; margin: 7px 0 var(--space-2); font-size: clamp(24px, 3vw, 32px); line-height: 1.3; letter-spacing: 0; }
.home-command__lead { max-width: 620px; margin: 0 0 var(--space-5); color: var(--color-text-muted); font-size: var(--text-md); line-height: 1.7; }
.home-command__stages { display: inline-flex; gap: var(--space-2); margin-bottom: var(--space-4); }
.home-command__stages a { display: flex; flex-direction: column; align-items: center; justify-content: center; min-width: 108px; padding: 10px 16px; border: 1px solid var(--color-border); border-radius: var(--radius); background: #fff; color: var(--color-text); text-align: center; box-shadow: var(--shadow-xs, 0 1px 3px rgba(20,40,90,.05)); transition: all 150ms ease; }
.home-command__stages a strong { font-size: var(--text-md); font-weight: var(--fw-bold); color: var(--color-text); }
.home-command__stages a small { margin-top: 2px; color: var(--color-text-muted); font-size: 11px; }
.home-command__stages a:hover { border-color: var(--color-primary); background: var(--color-primary-lightest); text-decoration: none; }
.home-command__stages a:hover strong { color: var(--color-primary); }
.home-command__actions { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.home-command__summary { display: flex; flex-direction: column; justify-content: center; min-height: 268px; padding: var(--space-5); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: rgba(255,255,255,.92); box-shadow: var(--shadow-sm); }
.home-command__summary-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); }
.home-command__summary-head > div { min-width: 0; }
.home-command__summary-head > div > span { color: var(--color-primary); font-size: var(--text-xs); font-weight: var(--fw-semibold); }
.home-command__summary-head h2 { margin: 3px 0 0; color: var(--color-text); font-size: var(--text-lg); line-height: 1.3; }
.home-command__summary-head a { color: var(--color-primary); font-size: var(--text-xs); font-weight: var(--fw-semibold); }
.home-command__summary-head a:hover { color: var(--color-primary-active); text-decoration: none; }
.home-command__metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-2); margin: var(--space-5) 0; }
.home-command__metric { display: grid; gap: 2px; min-width: 0; padding: 10px 8px; border: 1px solid var(--color-border-light); border-radius: var(--radius); background: var(--color-bg-hover); }
.home-command__metric-icon { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; margin-bottom: 3px; border-radius: 8px; }
.home-command__metric-icon--blue { background: var(--color-info-light); color: var(--color-info); }
.home-command__metric-icon--green { background: var(--color-success-light); color: var(--color-success); }
.home-command__metric-icon--orange { background: var(--color-warning-light); color: var(--color-warning); }
.home-command__metric strong { font-size: var(--text-xl); line-height: 1.2; font-variant-numeric: tabular-nums; }
.home-command__metric small { color: var(--color-text-muted); font-size: 11px; white-space: nowrap; }
.home-command__summary > strong { margin: var(--space-4) 0 8px; font-size: var(--text-2xl); line-height: 1.2; }
.home-command__summary p { color: var(--color-text-muted); font-size: var(--text-sm); }
.home-command__unfinished { display: grid; gap: 8px; margin-top: auto; padding-top: var(--space-4); border-top: 1px solid var(--color-border); }
.home-command__unfinished-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); }
.home-command__unfinished-head > div { display: grid; gap: 2px; }
.home-command__unfinished-head > div > span { color: var(--color-text-muted); font-size: var(--text-xs); }
.home-command__unfinished-head strong { font-size: var(--text-sm); }
.home-command__status { display: inline-flex; align-items: center; padding: 3px 7px; border-radius: var(--radius-full); font-size: 11px; font-weight: var(--fw-semibold); }
.home-command__status.is-progress { background: var(--color-warning-light); color: var(--color-warning-hover); }
.home-command__status.is-ready { background: var(--color-info-light); color: var(--color-info); }
.home-command__progress { height: 7px; overflow: hidden; border-radius: var(--radius-full); background: var(--color-bg-soft); }
.home-command__progress span { display: block; height: 100%; border-radius: inherit; background: var(--gradient-primary); transition: width 250ms ease; }
.home-command__progress-meta { display: flex; justify-content: space-between; gap: var(--space-2); }
.home-command__progress-meta small, .home-command__unfinished-empty { color: var(--color-text-muted); font-size: var(--text-xs); line-height: 1.5; }
.home-command__continue { display: inline-flex; align-items: center; justify-content: center; gap: 5px; width: fit-content; margin-top: 2px; font-weight: var(--fw-semibold); }
.home-command__guest-icon { display: inline-flex; align-items: center; justify-content: center; width: 46px; height: 46px; margin-top: var(--space-5); border-radius: 14px; background: var(--color-info-light); color: var(--color-info); }
.home-action-count { display: inline-flex; align-items: center; justify-content: center; min-width: 20px; height: 20px; margin-left: 4px; padding: 0 5px; border-radius: var(--radius-full); background: var(--color-error); color: #fff; font-size: var(--text-xs); line-height: 1; }
.home-banner.home-banner--compact { height: 190px; min-height: 190px; margin-bottom: var(--space-5); box-shadow: var(--shadow-sm); }
.home-banner--compact .home-banner__link img { height: 190px; }
.home-banner--compact .home-banner__caption strong { font-size: var(--text-xl); letter-spacing: 0; }
.home-workspace { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: var(--space-5); align-items: start; }
.home-question-section { margin-top: 0; }
.home-question-section + .home-question-section { margin-top: var(--space-6); }
.home-question-section .section__header > div p { color: var(--color-text-muted); font-size: var(--text-xs); margin-top: 2px; }
.home-question-list { border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; overflow: hidden; }
.home-question-row { display: flex; gap: var(--space-4); align-items: center; min-height: 116px; padding: var(--space-4); border-bottom: 1px solid var(--color-border-light); }
.home-question-row:last-child { border-bottom: 0; }
.home-question-row:hover { background: var(--color-bg-hover); }
.home-question-row__body { min-width: 0; flex: 1; }
.home-question-row h3 { margin: 6px 0; color: var(--color-text); font-size: var(--text-sm); font-weight: var(--fw-medium); line-height: 1.55; }
.home-question-row__meta { display: flex; flex-wrap: wrap; gap: 5px var(--space-3); color: var(--color-text-muted); font-size: var(--text-xs); }
.home-question-row__meta span { display: inline-flex; align-items: center; gap: 4px; }
.home-side { position: sticky; top: calc(var(--header-h) + var(--space-4)); display: grid; gap: var(--space-4); }
.home-notices, .home-shortcuts { border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; }
.home-notices { padding: var(--space-4); }
.home-notices .section__header { margin-bottom: 4px; }
.home-notices ol { list-style: none; }
.home-notices li a { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: var(--space-2); padding: 10px 0; border-bottom: 1px solid var(--color-border-light); color: var(--color-text-soft); }
.home-notices li:last-child a { border-bottom: 0; }
.home-notices li a:hover { color: var(--color-primary); text-decoration: none; }
.home-notices li span { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.home-notices time { color: var(--color-text-light); font-size: var(--text-xs); }
.notice-pin { margin-right: 5px; color: var(--color-warning-hover); font-size: 11px; }
.home-shortcuts { overflow: hidden; }
.home-shortcuts > a { display: grid; grid-template-columns: 28px minmax(0, 1fr) 14px; gap: var(--space-3); align-items: center; min-height: 68px; padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--color-border-light); color: var(--color-text); }
.home-shortcuts > a:last-child { border-bottom: 0; }
.home-shortcuts > a:hover { background: var(--color-bg-hover); color: var(--color-primary); text-decoration: none; }
.home-shortcuts > a > svg { color: var(--color-primary); }
.home-shortcuts span { display: grid; }
.home-shortcuts strong { font-size: var(--text-sm); }
.home-shortcuts small { color: var(--color-text-muted); font-size: var(--text-xs); }
.home-friend-links { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-6); padding-top: var(--space-4); border-top: 1px solid var(--color-border); font-size: var(--text-sm); }
.home-friend-links > span { color: var(--color-text-muted); font-weight: var(--fw-semibold); }

.question-card--done { background: #f7fcf9; border-color: #bbdfc7; }
.question-card--done:hover { border-color: var(--color-success); }
.question-done-tag { margin-left: auto; background: var(--color-success-light); border-color: var(--color-success-border); color: var(--color-success-hover); }
.question-done-tag.is-wrong { background: var(--color-error-light); border-color: var(--color-error-border); color: var(--color-error-hover); }
.btn--done { background: #fff; border: 1px solid var(--color-success); color: var(--color-success-hover); }
.btn--done:hover { background: var(--color-success-bg); color: var(--color-success-hover); }
.practice__audio, .question-detail__audio { margin-top: var(--space-3); border-left: 3px solid var(--color-primary); }

.member-center__head { position: relative; align-items: center; }
.member-center__settings { margin-left: auto; }
.member-membership { display: flex; flex-wrap: wrap; align-items: center; gap: 6px var(--space-3); margin: 4px 0; color: var(--color-text-muted); font-size: var(--text-xs); }
.member-membership a { display: inline-flex; align-items: center; gap: 4px; font-weight: var(--fw-semibold); }
.member-membership__warning { color: var(--color-error); font-weight: var(--fw-semibold); }
.learning-summary { display: grid; grid-template-columns: repeat(4, 1fr); margin: var(--space-4) 0; border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; }
.learning-summary > div { display: grid; gap: 2px; padding: var(--space-4); border-right: 1px solid var(--color-border-light); }
.learning-summary > div:last-child { border-right: 0; }
.learning-summary span { color: var(--color-text-muted); font-size: var(--text-xs); }
.learning-summary strong { font-size: var(--text-xl); }
.checkin-strip { display: grid; grid-template-columns: 180px minmax(0, 1fr) auto; gap: var(--space-4); align-items: center; margin-bottom: var(--space-5); padding: var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; }
.checkin-strip h2 { display: flex; align-items: center; gap: 6px; font-size: var(--text-md); }
.checkin-strip p { color: var(--color-text-muted); font-size: var(--text-xs); }
.checkin-streak { display: grid; grid-template-columns: repeat(7, minmax(38px, 1fr)); gap: 6px; }
.checkin-day { display: inline-flex; align-items: center; justify-content: center; min-height: 36px; padding: 4px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); color: var(--color-text-muted); font-size: 11px; }
.checkin-day--done { background: var(--color-success-bg); border-color: var(--color-success-border); color: var(--color-success-hover); }
.checkin-day--today { outline: 2px solid var(--color-primary-border); outline-offset: 1px; }
.member-tools { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); margin-bottom: var(--space-5); }
.member-tools > a { display: grid; grid-template-columns: 30px minmax(0, 1fr) 14px; gap: var(--space-3); align-items: center; min-height: 84px; padding: var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; color: var(--color-text); }
.member-tools > a:hover { border-color: var(--color-primary-border); box-shadow: var(--shadow-sm); color: var(--color-primary); text-decoration: none; }
.member-tools > a > svg { color: var(--color-primary); }
.member-tools span { display: grid; }
.member-tools strong { font-size: var(--text-sm); }
.member-tools small { color: var(--color-text-muted); font-size: var(--text-xs); }

.learning-stats-head, .leaderboard-head { display: flex; justify-content: space-between; align-items: flex-end; gap: var(--space-4); margin-bottom: var(--space-4); }
.learning-stats-head h1, .leaderboard-head h1 { display: flex; align-items: center; gap: var(--space-2); font-size: var(--text-2xl); }
.learning-stats-head p, .leaderboard-head p { color: var(--color-text-muted); font-size: var(--text-sm); }
.trend-change { padding: 6px 10px; border-radius: var(--radius); background: var(--color-bg-inset); color: var(--color-text-soft); font-size: var(--text-sm); font-weight: var(--fw-semibold); }
.trend-change.is-up { background: var(--color-success-light); color: var(--color-success-hover); }
.trend-change.is-down { background: var(--color-error-light); color: var(--color-error-hover); }
.learning-kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-3); margin-bottom: var(--space-5); }
.learning-kpis > div { display: grid; min-height: 120px; padding: var(--space-4); border: 1px solid var(--color-border); border-top: 3px solid var(--color-primary); border-radius: var(--radius-md); background: #fff; }
.learning-kpis > div.is-success { border-top-color: var(--color-success); }
.learning-kpis > div.is-danger { border-top-color: var(--color-error); }
.learning-kpis span, .learning-kpis small { color: var(--color-text-muted); font-size: var(--text-xs); }
.learning-kpis strong { align-self: center; font-size: var(--text-3xl); }
.period-performance, .learning-trend, .learning-insights > section, .learning-breakdown { margin-bottom: var(--space-5); padding: var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; }
.period-performance h2, .learning-insights h2, .learning-breakdown h2 { margin-bottom: var(--space-3); font-size: var(--text-md); }
.period-performance > div { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-3); }
.period-performance article { display: grid; padding: var(--space-3); background: var(--color-bg-hover); border-radius: var(--radius); }
.period-performance span, .period-performance small { color: var(--color-text-muted); font-size: var(--text-xs); }
.period-performance strong { font-size: var(--text-xl); }
.learning-trend__chart { display: flex; align-items: end; gap: 5px; height: 210px; padding-top: 30px; overflow-x: auto; }
.learning-trend__day { display: grid; grid-template-rows: 18px minmax(20px, 1fr) 18px; align-items: end; justify-items: center; flex: 1 0 28px; height: 100%; }
.learning-trend__day span, .learning-trend__day small { color: var(--color-text-muted); font-size: 10px; white-space: nowrap; }
.learning-trend__day i { display: block; width: 14px; min-height: 8px; max-height: 100%; border-radius: 3px 3px 0 0; background: var(--color-primary); }
.learning-insights { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.learning-insights h2 { display: flex; align-items: center; gap: 6px; }
.learning-insights section > a { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2px var(--space-3); padding: 9px 0; border-bottom: 1px solid var(--color-border-light); color: var(--color-text); }
.learning-insights section > a:hover { color: var(--color-primary); text-decoration: none; }
.learning-insights section > a span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.learning-insights section > a small { grid-column: 1 / -1; color: var(--color-text-muted); }
.learning-breakdowns { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.learning-breakdown { margin: 0; min-width: 0; }
.rate-meter { display: inline-block; width: 86px; height: 7px; margin-right: 6px; overflow: hidden; border-radius: var(--radius-full); background: var(--color-bg-soft); vertical-align: middle; }
.rate-meter i { display: block; height: 100%; background: var(--color-success); }
.text-success, .point-amount.is-credit { color: var(--color-success-hover); }
.point-amount.is-debit { color: var(--color-error); }

.segmented-control { display: inline-flex; gap: 2px; padding: 3px; border: 1px solid var(--color-border); border-radius: var(--radius); background: #fff; }
.segmented-control a { min-width: 58px; padding: 6px 10px; border-radius: var(--radius-sm); color: var(--color-text-soft); text-align: center; font-size: var(--text-sm); }
.segmented-control a:hover, .segmented-control a.is-active { background: var(--color-primary-light); color: var(--color-primary); text-decoration: none; }
.my-rank { display: flex; align-items: center; gap: var(--space-4); margin-bottom: var(--space-4); padding: var(--space-3) var(--space-4); border: 1px solid var(--color-primary-border); border-radius: var(--radius); background: var(--color-primary-lightest); }
.my-rank strong { color: var(--color-primary); font-size: var(--text-lg); }
.leaderboard-table { border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; }
.leaderboard-table tr.is-me { background: var(--color-primary-lightest); }
.rank-number { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; border-radius: 50%; background: var(--color-bg-inset); font-weight: var(--fw-semibold); }
.rank-number.is-top { background: var(--color-warning-light); color: var(--color-warning-hover); }
.leader-user { display: flex; align-items: center; gap: var(--space-2); }
.leader-user > span { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 50%; background: var(--color-primary-light); color: var(--color-primary); font-weight: var(--fw-semibold); }
.leader-user small { padding: 1px 5px; border-radius: var(--radius-sm); background: var(--color-primary); color: #fff; }
.leader-level { display: inline-flex; align-items: center; gap: 4px; padding: 2px 8px; border-radius: var(--radius-full); font-size: var(--text-xs); font-weight: var(--fw-semibold); white-space: nowrap; }
.leader-level--novice { background: var(--color-bg-inset); color: var(--color-text-muted); }
.leader-level--bronze { background: #f3e2d0; color: #9c5b21; }
.leader-level--silver { background: #e8eef4; color: #5b7186; }
.leader-level--gold { background: #fbf0d3; color: #9c7a14; }
.leader-level--platinum { background: #e4eef2; color: #3d7e96; }
.leader-level--diamond { background: #e3e9fb; color: #3b56a8; }
.leader-level--master { background: linear-gradient(135deg, #fdf0d8, #f5d9a8); color: #8a5a12; }

/* ============= 练习记录列表 ============= */
.history-list { display: grid; gap: var(--space-3); }
.history-item { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-3) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; }
.history-item__status { flex: 0 0 auto; }
.history-badge { display: inline-flex; align-items: center; justify-content: center; min-width: 52px; padding: 3px 8px; border-radius: var(--radius-full); font-size: var(--text-xs); font-weight: var(--fw-semibold); }
.history-badge--correct { background: var(--color-success-soft); color: var(--color-success); }
.history-badge--wrong { background: var(--color-error-soft); color: var(--color-error); }
.history-badge--pending { background: var(--color-warning-light); color: var(--color-warning-hover); }
.history-item__body { flex: 1; min-width: 0; }
.history-item__body h3 { margin: 0 0 6px; font-size: var(--text-sm); font-weight: var(--fw-semibold); overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.history-item__meta { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; font-size: var(--text-xs); }
.history-item__meta time { margin-left: auto; color: var(--color-text-muted); white-space: nowrap; }
.history-item__actions { flex: 0 0 auto; display: flex; gap: var(--space-2); }
.member-center__trophy { position: absolute; right: -4px; bottom: -4px; display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px; border-radius: 50%; background: var(--color-warning); color: #fff; border: 2px solid #fff; }
.tag--level-novice { background: var(--color-bg-inset); color: var(--color-text-muted); }
.tag--level-bronze { background: #f3e2d0; color: #9c5b21; }
.tag--level-silver { background: #e8eef4; color: #5b7186; }
.tag--level-gold { background: #fbf0d3; color: #9c7a14; }
.tag--level-platinum { background: #e4eef2; color: #3d7e96; }
.tag--level-diamond { background: #e3e9fb; color: #3b56a8; }
.tag--level-master { background: linear-gradient(135deg, #fdf0d8, #f5d9a8); color: #8a5a12; }
.member-recent-records { margin-bottom: var(--space-4); }
.table .is-empty-day td { color: var(--color-text-muted); }
@media (max-width: 640px) {
    .history-item { flex-direction: column; align-items: flex-start; }
    .history-item__actions { width: 100%; }
    .history-item__actions .btn { flex: 1; }
}

.content-page { max-width: 900px; margin: 0 auto; padding: var(--space-6); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: #fff; }
.content-page__head { margin: var(--space-4) 0 var(--space-6); padding-bottom: var(--space-4); border-bottom: 1px solid var(--color-border); }
.content-page__head h1 { font-size: var(--text-2xl); letter-spacing: 0; }
.content-page__head span { display: inline-flex; align-items: center; gap: 4px; margin-top: 5px; color: var(--color-text-muted); font-size: var(--text-xs); }
.content-page__body { line-height: 1.85; }
.content-page__body h2, .content-page__body h3 { margin: 1.6em 0 .65em; letter-spacing: 0; }
.content-page__body p, .content-page__body ul, .content-page__body ol { margin: .7em 0; }
.content-page__body ul, .content-page__body ol { padding-left: 1.6em; }

.input-static { min-height: 40px; display: flex; align-items: center; gap: var(--space-3); padding: 8px 12px; border: 1px solid var(--color-border); border-radius: var(--radius); background: var(--color-bg-hover); }

@media (max-width: 1100px) {
    .site-header__inner { grid-template-columns: auto auto 1fr; }
    .site-header__search { display: none; }
    .home-workspace { grid-template-columns: minmax(0, 1fr) 270px; }
    .member-tools { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .home-command { grid-template-columns: 1fr; padding: var(--space-5) var(--space-4); }
    .home-command h1 { font-size: var(--text-xl); }
    .home-command__lead { font-size: var(--text-sm); }
    .home-command__actions { display: grid; grid-template-columns: 1fr 1fr; }
    .home-command__actions .btn:first-child { grid-column: 1 / -1; }
    .home-command__summary { min-height: 0; padding: var(--space-4); }
    .basket-page-head { align-items:stretch; flex-direction:column; padding:var(--space-4); }
    .basket-page-head__actions { flex-wrap:wrap; }
    .basket-page-head__actions form { flex:1; }
    .basket-page-head__actions form .btn { width:100%; }
    .basket-overview { grid-template-columns:1fr 1fr; }
    .basket-overview__hint { grid-column:1 / -1; }
    .wrong-book-page .page-head { align-items:stretch; }
    .wrong-book-grid { grid-template-columns:1fr; }
    .practice-session__head { align-items:flex-start; flex-direction:column; }
    .practice-session__result-summary { grid-template-columns:1fr; gap:var(--space-2); }
    .practice-session__review-grid { grid-template-columns:1fr; }
    .home-workspace { grid-template-columns: 1fr; }
    .home-side { position: static; }
    .home-question-row { align-items: flex-end; min-height: 0; padding: var(--space-3); }
    .home-question-row h3 { max-height: 44px; overflow: hidden; }
    .home-banner--compact { min-height: 150px; }
    .home-banner--compact .home-banner__link img { height: 150px; }
    .learning-summary { grid-template-columns: 1fr 1fr; }
    .learning-summary > div:nth-child(2) { border-right: 0; }
    .learning-summary > div:nth-child(-n+2) { border-bottom: 1px solid var(--color-border-light); }
    .checkin-strip { grid-template-columns: 1fr; }
    .member-tools { grid-template-columns: 1fr; }
    .member-center__settings { position: absolute; top: 10px; right: 10px; }
    .learning-kpis { grid-template-columns: 1fr 1fr; }
    .learning-kpis > div { min-height: 100px; }
    .period-performance > div, .learning-insights, .learning-breakdowns { grid-template-columns: 1fr; }
    .learning-stats-head, .leaderboard-head { align-items: stretch; flex-direction: column; }
    .segmented-control { width: 100%; overflow-x: auto; }
    .segmented-control a { flex: 1 0 auto; }
    .content-page { padding: var(--space-4); }
}

/* ============= Reset ============= */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: "cv02", "cv03", "cv04", "cv11";
}
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary-hover); text-decoration: underline; }
img, svg { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea, button { font-size: inherit; }
::selection { background: var(--color-primary-light); color: var(--color-primary-active); }

/* SVG 图标 */
.icon, .icon-sm, .icon-lg, .icon-xs {
    display: inline-block;
    vertical-align: middle;
    flex-shrink: 0;
}
.icon { width: 18px; height: 18px; }
.icon-sm { width: 14px; height: 14px; }
.icon-xs { width: 12px; height: 12px; }
.icon-lg { width: 22px; height: 22px; }

.muted { color: var(--color-text-muted); }
.center { text-align: center; }
.required { color: var(--color-error); }
.link { color: var(--color-primary); }
.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.font-bold { font-weight: var(--fw-bold); }
.font-semibold { font-weight: var(--fw-semibold); }
.text-primary { color: var(--color-primary); }
.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.flex { display: flex; }
.items-center { align-items: center; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.mt-4 { margin-top: var(--space-4); }
.mb-4 { margin-bottom: var(--space-4); }
.w-full { width: 100%; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--space-5); }
.container--narrow { max-width: var(--container-narrow); }

/* ============= 按钮 ============= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 7px 16px;
    border: 1px solid transparent;
    border-radius: var(--radius);
    background: #fff;
    color: var(--color-text-soft);
    font-size: var(--text-sm);
    font-weight: var(--fw-medium);
    line-height: 1.4;
    cursor: pointer;
    text-decoration: none;
    white-space: nowrap;
    transition: all var(--transition-fast);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    position: relative;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(0); }
.btn:focus-visible { outline: none; box-shadow: var(--shadow-focus); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }

.btn--primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); box-shadow: var(--shadow-xs); }
.btn--primary:hover { background: var(--color-primary-hover); color: #fff; border-color: var(--color-primary-hover); box-shadow: var(--shadow-sm); }
.btn--primary:active { background: var(--color-primary-active); }

.btn--ghost { background: #fff; border-color: var(--color-border-medium); color: var(--color-text-soft); }
.btn--ghost:hover { background: var(--color-bg-hover); border-color: var(--color-border-dark); color: var(--color-text); }

.btn--danger { background: var(--color-error); color: #fff; border-color: var(--color-error); }
.btn--danger:hover { background: var(--color-error-hover); color: #fff; border-color: var(--color-error-hover); }

.btn--link { background: transparent; border-color: transparent; color: var(--color-primary); padding: 7px 8px; }
.btn--link:hover { background: var(--color-primary-light); text-decoration: none; }

.btn--lg { padding: 11px 28px; font-size: var(--text-md); border-radius: var(--radius-md); }
.btn--sm { padding: 4px 10px; font-size: var(--text-xs); border-radius: var(--radius-sm); }
.btn--icon { width: 34px; height: 34px; padding: 0; border-radius: var(--radius); }
.btn--block { display: flex; width: 100%; }
.btn--loading { color: transparent !important; pointer-events: none; }
.btn--loading::after {
    content: '';
    position: absolute;
    top: 50%; left: 50%;
    width: 14px; height: 14px;
    margin: -7px 0 0 -7px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============= 表单 ============= */
.input, input[type="text"], input[type="email"], input[type="password"],
input[type="number"], input[type="tel"], input[type="date"], input[type="search"],
input[type="url"], select, textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius);
    font-size: var(--text-base);
    font-family: inherit;
    background: #fff;
    color: var(--color-text);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    line-height: 1.5;
}
textarea { resize: vertical; min-height: 80px; line-height: 1.6; }
input:focus, select:focus, textarea:focus, .input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus);
}
input::placeholder, textarea::placeholder { color: var(--color-text-light); }
input:disabled, select:disabled, textarea:disabled { background: var(--color-bg-inset); cursor: not-allowed; opacity: 0.7; }

select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3e%3cpath d='m6 9 6 6 6-6'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 16px;
    padding-right: 32px;
}

.form-group { margin-bottom: var(--space-4); }
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: var(--fw-medium);
    color: var(--color-text-soft);
    font-size: var(--text-sm);
}
.form-group--inline { display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; }
.form-group--inline label { display: inline-flex; align-items: center; gap: 6px; margin: 0; font-weight: var(--fw-normal); }
.form-group--inline input[type="checkbox"], .form-group--inline input[type="radio"] { width: auto; accent-color: var(--color-primary); }
.form-group--full { grid-column: 1 / -1; }
.form-help { margin-top: 6px; font-size: var(--text-xs); color: var(--color-text-muted); }
.form-help select { display: inline-block; width: auto; min-width: 120px; }
.form { max-width: 720px; }
.form--two { display: grid; grid-template-columns: 1fr 1fr; gap: 0 var(--space-4); max-width: 100%; }
.form--inline { display: flex; gap: var(--space-2); align-items: center; flex-wrap: wrap; padding: var(--space-3); background: #fff; border-radius: var(--radius-md); margin-bottom: var(--space-4); border: 1px solid var(--color-border); box-shadow: var(--shadow-xs); }
.form--inline input, .form--inline select { width: auto; min-width: 120px; }

/* ============= Alert ============= */
.alert {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    margin: var(--space-3) 0;
    border: 1px solid transparent;
    font-size: var(--text-sm);
    border-left: 3px solid;
}
.alert--success { background: var(--color-success-bg); color: var(--color-success-hover); border-color: var(--color-success-border); }
.alert--error { background: var(--color-error-bg); color: var(--color-error-hover); border-color: var(--color-error-border); }
.alert ul { margin: 2px 0 0 18px; }
.alert .alert__icon { flex-shrink: 0; margin-top: 1px; }

/* ============= 标签 Badge ============= */
.tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: var(--radius-xs);
    background: var(--color-bg-inset);
    color: var(--color-text-soft);
    font-size: var(--text-xs);
    font-weight: var(--fw-medium);
    line-height: 1.5;
    margin-right: 4px;
    margin-bottom: 2px;
    border: 1px solid transparent;
    white-space: nowrap;
}
.tag--primary { background: var(--color-primary-light); color: var(--color-primary-active); border-color: var(--color-primary-border); }
.tag--success { background: var(--color-success-light); color: var(--color-success-hover); border-color: var(--color-success-border); }
.tag--error { background: var(--color-error-light); color: var(--color-error-hover); border-color: var(--color-error-border); }
.tag--warning { background: var(--color-warning-light); color: var(--color-warning-hover); border-color: var(--color-warning-border); }
.tag--info { background: var(--color-info-light); color: var(--color-info); border-color: var(--color-info-border); }
.tag--muted { background: var(--color-bg-inset); color: var(--color-text-muted); border-color: var(--color-border); }

/* 难度标识 - 特殊样式 */
.tag--difficulty-easy { background: #dcfce7; color: #15803d; border-color: #86efac; }
.tag--difficulty-normal { background: #fef3c7; color: #b45309; border-color: #fcd34d; }
.tag--difficulty-hard { background: #fee2e2; color: #b91c1c; border-color: #fca5a5; }

/* ============= 栅格 ============= */
.grid { display: grid; gap: var(--space-4); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--sidebar { display: grid; grid-template-columns: 240px 1fr; gap: var(--space-5); align-items: start; }
@media (max-width: 1024px) { .grid--4 { grid-template-columns: repeat(2, 1fr); } .grid--sidebar { grid-template-columns: 1fr; } }
@media (max-width: 768px) {
    .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
    .form--two { grid-template-columns: 1fr; }
}

/* ============= 站点头部 ============= */
.site-header {
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
}
.site-header__inner {
    display: flex;
    align-items: center;
    height: var(--header-h);
    gap: var(--space-3);
}
.site-header__brand {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text);
    font-weight: var(--fw-bold);
    font-size: var(--text-md);
    flex-shrink: 0;
}
.site-header__brand:hover { text-decoration: none; color: var(--color-text); }
.site-header__brand .logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px; height: 32px;
    background: var(--gradient-primary);
    border-radius: var(--radius);
    color: #fff;
    font-size: var(--text-base);
    font-weight: var(--fw-bold);
    box-shadow: var(--shadow-sm);
}
.site-header__brand .name { letter-spacing: 0; }
.site-header__brand .slogan {
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-weight: var(--fw-normal);
    margin-left: 4px;
    padding-left: 8px;
    border-left: 1px solid var(--color-border);
}
.site-header__search {
    flex: 1 1 180px;
    min-width: 150px;
    max-width: 280px;
    position: relative;
}
.site-header__search input {
    width: 100%;
    padding: 7px 12px 7px 34px;
    background: var(--color-bg-inset);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}
.site-header__search input:focus {
    outline: none;
    background: #fff;
    border-color: var(--color-primary-border);
    box-shadow: var(--shadow-sm);
}
.site-header__search .search-icon {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-light);
    pointer-events: none;
}
.site-header__stage {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    flex-shrink: 0;
    color: var(--color-text-muted);
    font-size: var(--text-xs);
}
.site-header__stage a {
    padding: 4px 7px;
    border-radius: var(--radius-sm);
    color: var(--color-text-soft);
    text-decoration: none;
}
.site-header__stage a:hover,
.site-header__stage a.is-active { background: var(--color-primary-light); color: var(--color-primary); }
.site-header__nav { display: flex; gap: 2px; align-items: center; }
.site-header__nav a {
    color: var(--color-text-soft);
    padding: 7px 12px;
    border-radius: var(--radius);
    font-weight: var(--fw-medium);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.site-header__nav a:hover { color: var(--color-primary); text-decoration: none; background: var(--color-primary-light); }
.site-header__nav a.active { color: var(--color-primary); background: var(--color-primary-light); }
.site-header__nav .site-header__vip { color: #a16207; }
.site-header__user { display: flex; align-items: center; gap: var(--space-2); flex-shrink: 0; }
.site-header__user .muted-link { color: var(--color-text-muted); font-size: var(--text-sm); padding: 6px 8px; border-radius: var(--radius); }
.site-header__user .muted-link:hover { color: var(--color-primary); text-decoration: none; background: var(--color-primary-light); }
.site-header__toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
    color: var(--color-text);
}
.site-header__search-btn { display: none; align-items: center; justify-content: center; width: 36px; height: 36px; border: 1px solid var(--color-border); border-radius: var(--radius-full); background: #fff; color: var(--color-text-soft); cursor: pointer; }
.site-header__mobile-search { display: none; }
@media (max-width: 1024px) {
    .site-header__search { display: none; }
    .site-header__brand .slogan { display: none; }
}
@media (max-width: 768px) {
    .site-header__inner { flex-wrap: wrap; height: auto; padding: var(--space-2) 0; gap: var(--space-3); }
    .site-header__toggle { display: block; }
    .site-header__nav, .site-header__user {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        padding-top: var(--space-2);
    }
    body.nav-open .site-header__nav,
    body.nav-open .site-header__user { display: flex; }
    .site-header__search { display: block; max-width: 100%; order: 3; }
    .site-header__stage { display: none; }
}

.site-main { padding: var(--space-6) 0 var(--space-12); min-height: calc(100vh - var(--header-h) - 240px); }

/* ============= 页脚 - 多列布局 ============= */
.site-footer {
    background: var(--color-bg-dark);
    color: #cbd5e1;
    padding: var(--space-10) 0 var(--space-5);
    margin-top: var(--space-12);
}
.site-footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-8);
    padding-bottom: var(--space-6);
    border-bottom: 1px solid #1e293b;
}
@media (max-width: 768px) {
    .site-footer__grid { grid-template-columns: 1fr 1fr; gap: var(--space-6); }
}
.site-footer__brand strong { display: block; color: #fff; font-size: var(--text-md); margin-bottom: 6px; }
.site-footer__brand p { color: #94a3b8; font-size: var(--text-sm); line-height: 1.7; max-width: 280px; }
.site-footer__col h4 { color: #fff; font-size: var(--text-sm); font-weight: var(--fw-semibold); margin-bottom: var(--space-3); text-transform: uppercase; letter-spacing: 0.05em; }
.site-footer__col ul { list-style: none; padding: 0; }
.site-footer__col ul li { margin-bottom: 8px; }
.site-footer__col ul li a { color: #94a3b8; font-size: var(--text-sm); }
.site-footer__col ul li a:hover { color: #fff; text-decoration: none; }
.site-footer__copy {
    color: #64748b;
    font-size: var(--text-xs);
    margin-top: var(--space-4);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
}
.site-footer__copy a { color: #64748b; }
.site-footer__copy a:hover { color: #cbd5e1; }

/* ============= 首页轮播与入口 ============= */
.home-banner { position: relative; min-height: 278px; margin-bottom: var(--space-6); overflow: hidden; border-radius: var(--radius-md); background: #174ea6; box-shadow: var(--shadow-md); }
.home-banner__viewport, .home-banner__slide, .home-banner__link { display: block; width: 100%; height: 100%; }
.home-banner__slide { position: absolute; inset: 0; opacity: 0; pointer-events: none; transition: opacity 220ms ease; }
.home-banner__slide.is-active { position: relative; opacity: 1; pointer-events: auto; }
.home-banner__link { position: relative; color: #fff; }
.home-banner__link:hover { color: #fff; text-decoration: none; }
.home-banner__link img { display: block; width: 100%; height: 278px; object-fit: cover; }
.home-banner__shade { position: absolute; inset: 0; background: rgba(15, 23, 42, 0.34); }
.home-banner__caption { position: absolute; left: var(--space-6); bottom: var(--space-5); display: grid; gap: 5px; max-width: min(68%, 580px); }
.home-banner__caption strong { font-size: var(--text-2xl); line-height: 1.3; }
.home-banner__caption small { font-size: var(--text-sm); opacity: .94; }
.home-banner__control { position: absolute; top: 50%; display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; transform: translateY(-50%); border: 0; border-radius: 50%; background: rgba(15, 23, 42, .56); color: #fff; cursor: pointer; }
.home-banner__control:hover { background: rgba(15, 23, 42, .78); }
.home-banner__control--prev { left: var(--space-3); }
.home-banner__control--next { right: var(--space-3); }
.home-banner__dots { position: absolute; right: var(--space-4); bottom: var(--space-3); display: flex; gap: 7px; }
.home-banner__dots button { width: 8px; height: 8px; padding: 0; border: 0; border-radius: 50%; background: rgba(255,255,255,.55); cursor: pointer; }
.home-banner__dots button.is-active { width: 22px; border-radius: 8px; background: #fff; }
.hero {
    background: #174ea6;
    color: #fff;
    border-radius: var(--radius-md);
    padding: var(--space-10) var(--space-8);
    margin-bottom: var(--space-6);
    position: relative;
    overflow: hidden;
}
.hero > * { position: relative; z-index: 1; }
.hero h1 { font-size: var(--text-4xl); font-weight: var(--fw-bold); letter-spacing: 0; margin-bottom: var(--space-2); }
.hero__slogan { font-size: var(--text-md); opacity: 0.9; margin-bottom: var(--space-6); font-weight: var(--fw-normal); }
.hero__stats {
    display: flex;
    gap: var(--space-8);
    margin-bottom: var(--space-6);
    flex-wrap: wrap;
}
.hero__stat { display: flex; flex-direction: column; gap: 2px; }
.hero__stat .num { font-size: var(--text-3xl); font-weight: var(--fw-bold); font-variant-numeric: tabular-nums; line-height: 1.1; }
.hero__stat .label { font-size: var(--text-xs); opacity: 0.8; text-transform: uppercase; letter-spacing: 0.05em; }
.hero__actions { display: flex; gap: var(--space-3); flex-wrap: wrap; }
.hero .btn--ghost { background: rgba(255, 255, 255, 0.12); color: #fff; border-color: rgba(255, 255, 255, 0.25); }
.hero .btn--ghost:hover { background: rgba(255, 255, 255, 0.2); border-color: rgba(255, 255, 255, 0.4); }

@media (max-width: 768px) {
    .hero { padding: var(--space-8) var(--space-4); }
    .hero h1 { font-size: var(--text-3xl); }
    .hero__stats { gap: var(--space-5); }
    .hero__stat .num { font-size: var(--text-2xl); }
}

/* ============= Section ============= */
.section { margin: var(--space-8) 0; }
.section__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-2);
    border-bottom: 2px solid var(--color-primary);
}
.section__header h2 {
    font-size: var(--text-lg);
    color: var(--color-text);
    font-weight: var(--fw-bold);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}
.section__header h2 .icon { color: var(--color-primary); }
.section__more {
    color: var(--color-primary);
    font-size: var(--text-sm);
    font-weight: var(--fw-medium);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.section__more:hover { color: var(--color-primary-hover); text-decoration: none; }

.page-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin: var(--space-4) 0 var(--space-6);
    flex-wrap: wrap;
    gap: var(--space-4);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border);
}
.page-head__title h1 { font-size: var(--text-2xl); font-weight: var(--fw-bold); letter-spacing: -0.01em; }
.page-head__title p { margin-top: 4px; color: var(--color-text-muted); font-size: var(--text-sm); }
.page-head__actions { display: flex; gap: var(--space-2); }

.page-title {
    font-size: var(--text-2xl);
    font-weight: var(--fw-bold);
    margin-bottom: var(--space-3);
    padding-bottom: var(--space-2);
    border-bottom: 2px solid var(--color-primary);
    letter-spacing: -0.01em;
}

/* ============= 面包屑 ============= */
.breadcrumb {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    margin-bottom: var(--space-3);
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}
.breadcrumb a { color: var(--color-text-muted); display: inline-flex; align-items: center; gap: 4px; }
.breadcrumb a:hover { color: var(--color-primary); text-decoration: none; }
.breadcrumb .sep { color: var(--color-text-disabled); }

/* ============= 快速入口卡片 ============= */
.entry-card {
    display: block;
    background: #fff;
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    color: var(--color-text);
    transition: all var(--transition);
    height: 100%;
}
.entry-card:hover { text-decoration: none; color: var(--color-text); background: var(--color-primary-lightest); border-left-color: var(--color-primary-active); box-shadow: var(--shadow-md); transform: translateX(2px); }
.entry-card__title { font-weight: var(--fw-semibold); margin-bottom: 4px; font-size: var(--text-md); color: var(--color-primary); }
.entry-card__sub { font-size: var(--text-xs); color: var(--color-text-muted); line-height: 1.6; }
.entry-card__meta { margin-top: var(--space-2); font-size: var(--text-xs); color: var(--color-text-light); display: flex; align-items: center; gap: 4px; }

/* ============= 试卷卡片 ============= */
.paper-card {
    display: block;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    color: var(--color-text);
    transition: all var(--transition);
    height: 100%;
    position: relative;
}
.paper-card:hover { text-decoration: none; color: var(--color-text); border-color: var(--color-primary-border); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.paper-card__head { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: var(--space-2); align-items: center; }
.paper-card__head .tag--recommended { background: #fef3c7; color: #92400e; border-color: #fcd34d; font-weight: var(--fw-semibold); }
.paper-card__title { font-weight: var(--fw-semibold); font-size: var(--text-md); line-height: 1.5; margin-bottom: var(--space-2); min-height: 45px; color: var(--color-text); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.paper-card__meta {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
    align-items: center;
    padding-top: var(--space-2);
    border-top: 1px solid var(--color-border-light);
}
.paper-card__meta .meta-item { display: inline-flex; align-items: center; gap: 4px; }
.paper-card__note { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: var(--space-2); padding-top: var(--space-2); border-top: 1px dashed var(--color-border); }

/* ============= 题目卡片 ============= */
.question-card {
    display: block;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    color: var(--color-text);
    transition: all var(--transition);
    height: 100%;
}
.question-card:hover { text-decoration: none; color: var(--color-text); border-color: var(--color-primary-border); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.question-card__head { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: var(--space-2); align-items: center; }
.question-card__stem { font-size: var(--text-sm); line-height: 1.6; margin-bottom: var(--space-2); min-height: 40px; color: var(--color-text-soft); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.question-card__meta { font-size: var(--text-xs); color: var(--color-text-muted); display: flex; gap: var(--space-2); flex-wrap: wrap; align-items: center; padding-top: var(--space-2); border-top: 1px solid var(--color-border-light); }
.question-card__meta .meta-item { display: inline-flex; align-items: center; gap: 4px; }
.question-card__footer { display: flex; gap: var(--space-2); margin-top: var(--space-2); padding-top: var(--space-2); border-top: 1px dashed var(--color-border); }
.question-card--resolved { opacity: 0.75; }

/* ============= 筛选栏 ============= */
.filter-bar {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
    overflow: hidden;
    box-shadow: var(--shadow-xs);
}
.filter-bar__row {
    display: flex;
    gap: var(--space-3);
    padding: 10px var(--space-4);
    border-bottom: 1px solid var(--color-border-light);
    align-items: flex-start;
}
.filter-bar__row:last-child { border-bottom: none; }
.filter-bar__label {
    width: 72px;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    flex-shrink: 0;
    padding-top: 5px;
    font-weight: var(--fw-medium);
    display: flex;
    align-items: center;
    gap: 4px;
}
.filter-bar__values { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; flex: 1; }
.filter-bar__values input[type="text"], .filter-bar__values select { width: auto; min-width: 120px; padding: 5px 10px; font-size: var(--text-sm); }

.chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--color-text-soft);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid var(--color-border);
    user-select: none;
    white-space: nowrap;
}
.chip:hover { border-color: var(--color-primary-border); color: var(--color-primary); background: var(--color-primary-lightest); }
.chip--active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.chip--active:hover { background: var(--color-primary-hover); color: #fff; border-color: var(--color-primary-hover); }
.chip input { display: none; }

/* ============= 分页 ============= */
.pagination { margin: var(--space-6) 0; display: flex; justify-content: center; }
.pagination ul { display: inline-flex; gap: 4px; list-style: none; }
.pagination li a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 34px;
    padding: 0 10px;
    background: #fff;
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-sm);
    color: var(--color-text-soft);
    font-weight: var(--fw-medium);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}
.pagination li a:hover { background: var(--color-primary-light); color: var(--color-primary); text-decoration: none; border-color: var(--color-primary-border); }
.pagination li.active a { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.pagination li.disabled a { color: var(--color-text-disabled); pointer-events: none; background: var(--color-bg-inset); }

/* ============= 空状态 ============= */
.empty-state {
    text-align: center;
    padding: var(--space-12) var(--space-4);
    color: var(--color-text-muted);
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}
.empty-state__icon {
    width: 56px; height: 56px;
    margin: 0 auto var(--space-3);
    color: var(--color-text-disabled);
}
.empty-state h3 { color: var(--color-text); margin-bottom: 6px; font-size: var(--text-md); font-weight: var(--fw-semibold); }
.empty-state p { font-size: var(--text-sm); margin-bottom: var(--space-3); }

/* ============= 题目详情 / 练习 ============= */
.question-detail, .practice {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-6);
    margin-bottom: var(--space-4);
    box-shadow: var(--shadow-xs);
}
.question-detail__head { margin-bottom: var(--space-4); padding-bottom: var(--space-4); border-bottom: 1px solid var(--color-border); }
.question-detail__title { font-size: var(--text-xl); margin-bottom: var(--space-2); font-weight: var(--fw-bold); letter-spacing: -0.01em; }
.question-detail__tags { display: flex; gap: 4px; flex-wrap: wrap; }
.question-detail__stem { font-size: var(--text-md); line-height: 1.8; margin-bottom: var(--space-4); color: var(--color-text); }
.question-detail__audio, .practice__audio {
    margin: var(--space-4) 0;
    padding: var(--space-4);
    background: var(--color-primary-lightest);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-primary-100);
}
.question-detail__audio h3, .practice__audio h3 {
    margin-bottom: var(--space-3);
    color: var(--color-primary-active);
    font-size: var(--text-md);
    font-weight: var(--fw-semibold);
    display: flex;
    align-items: center;
    gap: 6px;
}
.question-detail__options, .practice__options { margin: var(--space-4) 0; }
.question-detail__options h3, .practice__options h3 { margin-bottom: var(--space-2); font-size: var(--text-md); font-weight: var(--fw-semibold); display: flex; align-items: center; gap: 6px; }
.question-detail__actions, .practice__actions { display: flex; gap: var(--space-2); margin-top: var(--space-4); flex-wrap: wrap; }
.question-detail__attrs { margin: var(--space-4) 0; }
.question-detail__attrs h3 { margin-bottom: var(--space-2); font-size: var(--text-md); font-weight: var(--fw-semibold); }

.attr-table { width: 100%; border-collapse: collapse; font-size: var(--text-sm); border: 1px solid var(--color-border); border-radius: var(--radius-sm); overflow: hidden; }
.attr-table th, .attr-table td { padding: 8px 12px; border: 1px solid var(--color-border); text-align: left; }
.attr-table th { background: var(--color-bg-inset); color: var(--color-text-muted); font-weight: var(--fw-medium); width: 100px; }
.attr-table td { color: var(--color-text-soft); }
.attr-table tr:nth-child(even) td { background: var(--color-bg-hover); }

.option-list { list-style: none; padding: 0; }
.option-list li { padding: 10px 12px; border: 1px solid var(--color-border); border-radius: var(--radius); margin-bottom: 8px; background: #fff; transition: all var(--transition-fast); }
.option-list li:hover { border-color: var(--color-primary-border); background: var(--color-primary-lightest); }
.option-list--interactive li { cursor: default; }
.option-item { display: flex; align-items: flex-start; gap: var(--space-2); cursor: pointer; }
.option-item input[type="radio"], .option-item input[type="checkbox"] { margin-top: 4px; width: auto; accent-color: var(--color-primary); }
.option-item__label { font-weight: var(--fw-semibold); color: var(--color-primary); min-width: 20px; }
.option-item__content { flex: 1; color: var(--color-text-soft); }

.answer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); margin-top: var(--space-2); }
.answer-grid__full { grid-column: 1 / -1; }
.answer-grid > div { background: var(--color-bg-inset); padding: var(--space-3); border-radius: var(--radius); border: 1px solid var(--color-border); }
.answer-grid strong { display: block; margin-bottom: 4px; color: var(--color-primary); font-weight: var(--fw-semibold); font-size: var(--text-sm); }

.transcript {
    background: var(--color-bg-dark);
    color: #e2e8f0;
    padding: var(--space-4);
    border-radius: var(--radius);
    white-space: pre-wrap;
    font-family: "SF Mono", "JetBrains Mono", "Consolas", "Courier New", monospace;
    font-size: var(--text-sm);
    line-height: 1.8;
    max-height: 400px;
    overflow-y: auto;
}
.transcript--full { max-height: none; }

.related { margin-top: var(--space-8); }
.related h3 { margin-bottom: var(--space-3); font-size: var(--text-lg); font-weight: var(--fw-bold); display: flex; align-items: center; gap: 6px; }

.prose { line-height: 1.8; color: var(--color-text-soft); }
.prose h2 { font-size: var(--text-lg); margin: var(--space-4) 0 var(--space-2); font-weight: var(--fw-bold); color: var(--color-text); }
.prose h3 { font-size: var(--text-md); margin: var(--space-3) 0 var(--space-2); font-weight: var(--fw-semibold); color: var(--color-text); }
.prose p { margin-bottom: var(--space-2); }
.prose ul { padding-left: var(--space-6); margin: var(--space-2) 0; }
.prose li { margin-bottom: 6px; }
.prose a { color: var(--color-primary); }

/* ============= 练习页 ============= */
.practice__head { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-4); flex-wrap: wrap; gap: var(--space-2); padding-bottom: var(--space-3); border-bottom: 1px solid var(--color-border); }
.practice__group { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); margin-bottom: var(--space-3); padding: 10px var(--space-3); border: 1px solid var(--color-primary-100); border-radius: var(--radius); background: var(--color-primary-lightest); }
.practice__group > div { display: grid; gap: 3px; min-width: 0; }
.practice__group strong { color: var(--color-primary-active); font-size: var(--text-sm); }
.practice__group span { color: var(--color-text-muted); font-size: var(--text-xs); }
.practice__group ol { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 6px; margin: 0; padding: 0; list-style: none; }
.practice__group li a { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; border: 1px solid var(--color-primary-border); border-radius: 50%; color: var(--color-primary); font-size: var(--text-sm); font-weight: var(--fw-semibold); }
.practice__group li.is-current a { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.practice__stem { font-size: var(--text-md); line-height: 1.8; margin-bottom: var(--space-4); color: var(--color-text); }
.practice__form { margin: var(--space-4) 0; }
.practice__result { margin: var(--space-4) 0; padding: var(--space-4); background: var(--color-primary-lightest); border-radius: var(--radius-md); border: 1px solid var(--color-primary-100); }
.practice-session { max-width: 980px; margin: 0 auto; }
.practice-session__head { display:flex; justify-content:space-between; align-items:flex-end; gap:var(--space-4); margin-bottom:var(--space-4); padding-bottom:var(--space-3); border-bottom:1px solid var(--color-border); }
.practice-session__head h1 { margin:.45rem 0 .2rem; }
.practice-session__summary { display:flex; align-items:center; gap:6px; white-space:nowrap; color:var(--color-text-muted); }
.practice-session__summary strong { font-size:var(--text-xl); color:var(--color-primary-active); }
.practice-session__progress-card { display:grid; gap:10px; margin:var(--space-4) 0; padding:var(--space-4); border:1px solid var(--color-primary-100); border-radius:var(--radius-md); background:linear-gradient(135deg,var(--color-primary-lightest),#fff); }
.practice-session__progress-copy { display:flex; align-items:center; justify-content:space-between; gap:var(--space-3); }
.practice-session__progress-copy span { color:var(--color-text-muted); font-size:var(--text-sm); }
.practice-session__progress-copy strong { color:var(--color-primary-active); font-size:var(--text-md); font-variant-numeric:tabular-nums; }
.practice-session__progress-track { height:9px; overflow:hidden; border-radius:var(--radius-full); background:var(--color-bg-soft); }
.practice-session__progress-track span { display:block; height:100%; border-radius:inherit; background:var(--gradient-primary); transition:width 250ms ease; }
.practice-session__progress-card > small { color:var(--color-text-muted); font-size:var(--text-xs); }
.practice-session__result-summary { display:grid; grid-template-columns:repeat(3,1fr); gap:var(--space-3); margin:var(--space-4) 0; }
.practice-session__result-summary > div { display:flex; align-items:baseline; gap:6px; padding:var(--space-3); border:1px solid var(--color-border); border-radius:var(--radius); background:#fff; }
.practice-session__result-summary span { color:var(--color-text-muted); font-size:var(--text-xs); }
.practice-session__result-summary strong { color:var(--color-primary-active); font-size:var(--text-xl); font-variant-numeric:tabular-nums; }
.practice-session__result-summary small { color:var(--color-text-muted); font-size:var(--text-xs); }
.practice-session__group { margin:var(--space-4) 0; padding:var(--space-4); border:1px solid var(--color-border); border-radius:var(--radius-md); background:#fff; }
.practice-session__group-head { display:flex; justify-content:space-between; align-items:center; gap:var(--space-3); margin-bottom:var(--space-3); padding-bottom:var(--space-3); border-bottom:1px solid var(--color-border); }
.practice-session__group-head h2 { margin:.25rem 0 0; font-size:var(--text-lg); }
.session-audio { width:min(100%, 440px); }
.practice-session__questions { margin:0; padding-left:1.6rem; }
.practice-session__question { padding:var(--space-3) 0 var(--space-4); border-bottom:1px solid var(--color-border-light); }
.practice-session__question:last-child { border-bottom:0; }
.practice-session__question-head { display:flex; align-items:center; gap:6px; margin-bottom:var(--space-2); }
.practice-session__stem { line-height:1.75; margin-bottom:var(--space-3); max-width:100%; overflow-wrap:anywhere; }
.practice-session__stem table { width:100% !important; max-width:100%; table-layout:fixed; border-collapse:collapse; }
.practice-session__stem th, .practice-session__stem td { width:auto !important; min-width:0; max-width:100%; overflow:hidden; overflow-wrap:anywhere; word-break:break-word; white-space:normal; }
.practice-session__review-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:var(--space-3); margin-top:var(--space-3); }
.practice-session__result { padding:var(--space-3); border-left:3px solid var(--color-primary); background:var(--color-primary-soft); }
.practice-session__result strong { display:block; margin-bottom:var(--space-1); color:var(--color-primary-active); }
.practice-session__review-link { margin-top: var(--space-2); }
.practice-session__actions { display:flex; justify-content:flex-end; gap:var(--space-2); margin-top:var(--space-4); position:sticky; bottom:0; padding:var(--space-3); background:rgba(255,255,255,.96); border-top:1px solid var(--color-border); z-index:2; }
.practice-session__abandon { text-align:right; margin-top:var(--space-2); }
.practice__result .result-correct { color: var(--color-success); font-weight: var(--fw-bold); font-size: var(--text-lg); }
.practice__result .result-wrong { color: var(--color-error); font-weight: var(--fw-bold); font-size: var(--text-lg); }

/* ============= 逐题作答模式 ============= */
.practice-session__player { position:relative; }
.practice-session__question-card { padding:var(--space-4); border:1px solid var(--color-border); border-radius:var(--radius-md); background:#fff; }
.practice-session__question-card .option-list { margin-bottom:var(--space-3); }
.practice-session__question-card .practice-session__stem { margin-top:var(--space-3); }
.practice-session__audio { margin:var(--space-3) 0; }
.practice-session__audio h3 { display:flex; align-items:center; gap:6px; color:var(--color-text-muted); font-size:var(--text-sm); margin-bottom:var(--space-2); }
.practice-session__audio audio { width:100%; }
.practice-session__actions { display:flex; justify-content:flex-end; gap:var(--space-2); margin-top:var(--space-4); }
.practice-session__grade-result { padding:var(--space-4); border:1px solid var(--color-primary-100); border-radius:var(--radius-md); background:linear-gradient(135deg,var(--color-primary-lightest),#fff); }
.practice-session__grade-title { margin-bottom:var(--space-3); }
.practice-session__grade-title .result-correct { color:var(--color-success); font-weight:var(--fw-bold); font-size:var(--text-xl); }
.practice-session__grade-title .result-wrong { color:var(--color-error); font-weight:var(--fw-bold); font-size:var(--text-xl); }
.practice-session__grade-body { display:grid; gap:var(--space-2); }
.practice-session__grade-next { display:flex; align-items:center; justify-content:flex-end; gap:var(--space-3); margin-top:var(--space-4); color:var(--color-text-muted); font-size:var(--text-sm); }
.practice-session__dock { position:sticky; bottom:0; z-index:5; margin-top:var(--space-4); padding:var(--space-3) var(--space-4); border:1px solid var(--color-border); border-radius:var(--radius-md) var(--radius-md) 0 0; background:rgba(255,255,255,.97); box-shadow:0 -4px 16px rgba(20,40,90,.08); }
.practice-session__dock-progress { display:flex; align-items:center; gap:var(--space-3); margin-bottom:var(--space-2); }
.practice-session__dock-label { color:var(--color-text-muted); font-size:var(--text-xs); white-space:nowrap; }
.practice-session__dock-progress .practice-session__progress-track { flex:1; }
.practice-session__dock-progress strong { font-variant-numeric:tabular-nums; color:var(--color-primary-active); font-size:var(--text-sm); white-space:nowrap; }
.practice-session__dock-numbers { display:flex; flex-wrap:wrap; gap:6px; }
.practice-session__dock-numbers button { width:34px; height:34px; display:inline-flex; align-items:center; justify-content:center; border:1px solid var(--color-border); border-radius:var(--radius-full); background:#fff; color:var(--color-text-muted); font-size:var(--text-sm); cursor:pointer; transition:all 150ms ease; }
.practice-session__dock-numbers button:hover { border-color:var(--color-primary); color:var(--color-primary-active); }
.practice-session__dock-numbers button.is-current { border-color:var(--color-primary); background:var(--color-primary); color:#fff; font-weight:var(--fw-semibold); }
.practice-session__dock-numbers button.is-answered { border-color:var(--color-success); color:var(--color-success); }
.practice-session__dock-numbers button.is-correct { background:var(--color-success); border-color:var(--color-success); color:#fff; }
.practice-session__dock-numbers button.is-wrong { background:var(--color-error); border-color:var(--color-error); color:#fff; }
.practice-session__dock-actions { display:flex; justify-content:flex-end; gap:var(--space-2); margin-top:var(--space-3); padding-top:var(--space-3); border-top:1px solid var(--color-border-light); }
.practice-session__review { display:grid; gap:var(--space-4); margin-top:var(--space-3); }
.practice-session__review-question { padding:var(--space-4); border:1px solid var(--color-border); border-radius:var(--radius-md); background:#fff; }
.practice-session__review-question.is-correct { border-color:var(--color-success-border); }
.practice-session__review-question.is-wrong { border:2px solid var(--color-error); background:var(--color-error-light); }
.practice-session__review-question.is-unanswered { border-color:var(--color-warning-border); }
.practice-session__result--user { background:var(--color-bg-inset); }
.practice-session__result--correct { border:1px solid var(--color-success-border); background:var(--color-success-light); }
.practice-session__result-actions { grid-column:1/-1; display:flex; justify-content:flex-end; }
@media (max-width:640px) {
    .practice-session__dock { padding:var(--space-2) var(--space-3); }
    .practice-session__dock-numbers button { width:30px; height:30px; }
    .practice-session__dock-actions { display:grid; grid-template-columns:1fr 1fr; }
    .practice-session__dock-actions .btn { width:100%; }
    .practice-session__grade-next { flex-direction:column; align-items:stretch; }
    .practice-session__grade-next .btn { width:100%; }
}

/* ============= 听写填空分空输入 ============= */
/* 题库卡片右上角试题篮 icon 按钮 */
.question-card__basket-btn { display: inline-flex; align-items: center; justify-content: center; width: 30px; height: 30px; margin-left: auto; border: 1px solid var(--color-border); border-radius: var(--radius-full); background: #fff; color: var(--color-text-muted); cursor: pointer; transition: all 150ms ease; }
.question-card__basket-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.question-card__basket-btn.is-added { border-color: var(--color-primary); background: var(--color-primary); color: #fff; }
/* 逐题答案折叠 */
.practice-session__answer-toggle { margin: var(--space-2) 0; }
.practice-session__answer-toggle .btn { width: 100%; }
.fill-blank-grid { display: grid; gap: var(--space-2); margin: var(--space-3) 0; }
.fill-blank-item { display: flex; align-items: center; gap: var(--space-2); }
.fill-blank-item label { min-width: 22px; font-weight: var(--fw-semibold); color: var(--color-primary-active); }
.fill-blank-input { flex: 1; }
/* ============= 会员等级环/进度 ============= */
.member-center__avatar { position: relative; }
.member-center__avatar--level-novice { box-shadow: 0 0 0 3px var(--color-bg-inset); }
.member-center__avatar--level-bronze { box-shadow: 0 0 0 3px #c07a3a; }
.member-center__avatar--level-silver { box-shadow: 0 0 0 3px #8ea2b6; }
.member-center__avatar--level-gold { box-shadow: 0 0 0 3px #d9a528; }
.member-center__avatar--level-platinum { box-shadow: 0 0 0 3px #4d97ad; }
.member-center__avatar--level-diamond { box-shadow: 0 0 0 3px #4f6fd4; }
.member-center__avatar--level-master { box-shadow: 0 0 0 3px #b8860b; }
.member-center__level-progress { display: flex; align-items: center; gap: 8px; margin-top: 6px; font-size: var(--text-xs); color: var(--color-text-muted); }
.member-center__level-progress .progress { flex-shrink: 0; }
/* ============= 计时器暂停 ============= */
.timer-pause { margin-left: auto; }
.question-detail__attrs { margin-top: var(--space-4); }
.question-detail__attrs summary { cursor: pointer; font-weight: var(--fw-semibold); padding: var(--space-2) 0; color: var(--color-primary); }
.toast-container { position: fixed; top: 16px; left: 50%; transform: translateX(-50%); z-index: 9999; display: flex; flex-direction: column; align-items: center; gap: 8px; pointer-events: none; max-width: 92vw; }
.toast { padding: 10px 18px; border-radius: var(--radius-full); background: rgba(30,41,59,.92); color: #fff; font-size: var(--text-sm); box-shadow: var(--shadow-md); animation: toast-in 200ms ease; opacity: 1; transition: opacity 300ms ease; }
.toast--success { background: rgba(16,122,87,.95); }
.toast--error { background: rgba(190,46,46,.95); }
.toast--warning { background: rgba(180,120,10,.95); }
.toast.is-leaving { opacity: 0; }
@keyframes toast-in { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
.audio-player {
    background: #fff;
    padding: var(--space-3);
    border-radius: var(--radius);
    margin: 6px 0;
    border: 1px solid var(--color-border);
}
.audio-player audio { width: 100%; }
.audio-player--lg { padding: var(--space-4); }
.audio-player--inline { padding: 8px; margin: 6px 0; }
.audio-player__controls {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-3);
    flex-wrap: wrap;
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border-light);
}
.audio-player__time { font-family: "SF Mono", "JetBrains Mono", "Consolas", monospace; font-size: var(--text-sm); color: var(--color-text-muted); font-variant-numeric: tabular-nums; }
.audio-player__progress { flex: 1; min-width: 200px; accent-color: var(--color-primary); height: 4px; }
.audio-player__rate, .audio-player__loop, .audio-player__ab { font-size: var(--text-sm); display: inline-flex; align-items: center; gap: 6px; color: var(--color-text-soft); }
.audio-player__rate-label { white-space: nowrap; }
.audio-player__rate-options { display: inline-flex; flex-wrap: wrap; gap: 4px; }
.audio-rate-btn { min-width: 42px; min-height: 32px; padding: 4px 7px; border: 1px solid var(--color-border-medium); border-radius: var(--radius-sm); background: #fff; color: var(--color-text-soft); font-size: var(--text-xs); line-height: 1; cursor: pointer; transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast); }
.audio-rate-btn:hover { border-color: var(--color-primary-border); color: var(--color-primary); background: var(--color-primary-lightest); }
.audio-rate-btn.is-active { border-color: var(--color-primary); background: var(--color-primary); color: #fff; font-weight: var(--fw-semibold); }
.audio-rate-btn:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.audio-player__tracks { margin-top: var(--space-2); display: flex; gap: 4px; flex-wrap: wrap; }

/* ============= 试题篮与错题本 ============= */
.basket-page-head { display:flex; align-items:flex-end; justify-content:space-between; gap:var(--space-5); margin:var(--space-4) 0 var(--space-5); padding:var(--space-5); border:1px solid var(--color-primary-100); border-top:3px solid var(--color-primary); border-radius:var(--radius-md); background:linear-gradient(135deg,var(--color-primary-lightest),#fff 72%); box-shadow:var(--shadow-sm); }
.basket-page-head h1, .wrong-book-page .page-head h1 { display:flex; align-items:center; gap:8px; margin:4px 0; }
.basket-page-head p, .wrong-book-page .page-head p { margin:0; color:var(--color-text-muted); font-size:var(--text-sm); }
.basket-page-head__actions { display:flex; align-items:center; gap:var(--space-2); flex-shrink:0; }
.basket-overview { display:grid; grid-template-columns:140px 140px minmax(0,1fr); gap:var(--space-3); margin-bottom:var(--space-4); }
.basket-overview > div { display:flex; flex-direction:column; justify-content:center; min-height:76px; padding:var(--space-3); border:1px solid var(--color-border); border-radius:var(--radius); background:#fff; }
.basket-overview strong { color:var(--color-primary-active); font-size:var(--text-2xl); font-variant-numeric:tabular-nums; }
.basket-overview span { color:var(--color-text-muted); font-size:var(--text-xs); }
.basket-overview__hint { flex-direction:row !important; align-items:center; gap:8px; background:var(--color-info-bg) !important; border-color:var(--color-info-border) !important; color:var(--color-info); }
.basket-overview__hint span { color:var(--color-info); line-height:1.5; }
.basket-question-list { align-items:stretch; }
.basket-question-card { min-height:220px; }
.basket-question-card h2, .wrong-book-card h2 { font-size:var(--text-md); line-height:1.65; }
.basket-empty__icon, .wrong-book-empty__icon { display:inline-flex; align-items:center; justify-content:center; width:52px; height:52px; margin-bottom:var(--space-3); border-radius:16px; background:var(--color-info-light); color:var(--color-info); }
.wrong-book-page .page-head { align-items:flex-end; }
.wrong-book-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:var(--space-4); }
.wrong-book-card { min-height:220px; }
.wrong-book-empty .wrong-book-empty__icon { background:var(--color-success-light); color:var(--color-success); }

/* ============= Auth ============= */
.auth { display: flex; justify-content: center; align-items: flex-start; padding: var(--space-10) 0; background: var(--gradient-subtle); min-height: calc(100vh - var(--header-h) - 100px); }
.auth__card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-8);
    max-width: 440px;
    width: 100%;
}
.auth__title { font-size: var(--text-xl); margin-bottom: 4px; font-weight: var(--fw-bold); letter-spacing: -0.01em; }
.auth__sub { color: var(--color-text-muted); margin-bottom: var(--space-6); font-size: var(--text-sm); }
.auth__form .form-group { margin-bottom: var(--space-4); }
.auth__alt { margin-top: var(--space-4); text-align: center; color: var(--color-text-muted); font-size: var(--text-sm); padding-top: var(--space-4); border-top: 1px solid var(--color-border-light); }

/* ============= 会员中心 ============= */
.member-center__head {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    background: #fff;
    padding: var(--space-5);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-5);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-xs);
}
.member-center__avatar {
    width: 56px; height: 56px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-2xl);
    font-weight: var(--fw-bold);
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
}
.member-center__info h1 { font-size: var(--text-lg); margin-bottom: 4px; font-weight: var(--fw-bold); }
.member-center__info p { color: var(--color-text-muted); font-size: var(--text-sm); }
.member-center__actions { margin-top: var(--space-5); display: flex; gap: var(--space-2); flex-wrap: wrap; }

/* 统计卡片 */
.stat-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.stat-card:hover { border-color: var(--color-primary-border); box-shadow: var(--shadow-md); }
.stat-card__head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-2); }
.stat-card__icon {
    width: 36px; height: 36px;
    border-radius: var(--radius);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-light);
    color: var(--color-primary);
}
.stat-card__icon--success { background: var(--color-success-light); color: var(--color-success); }
.stat-card__icon--warning { background: var(--color-warning-light); color: var(--color-warning); }
.stat-card__icon--info { background: var(--color-info-light); color: var(--color-info); }
.stat-card__num { font-size: var(--text-2xl); font-weight: var(--fw-bold); color: var(--color-text); font-variant-numeric: tabular-nums; line-height: 1.2; }
.stat-card__label { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.03em; }
.stat-card__extra { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: var(--space-2); padding-top: var(--space-2); border-top: 1px solid var(--color-border-light); }
.stat-card--lg { padding: var(--space-5); }
.stat-card--lg .stat-card__num { font-size: var(--text-3xl); }

/* ============= 表格 ============= */
.table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    font-size: var(--text-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-xs);
}
.table th, .table td {
    padding: 11px 14px;
    text-align: left;
    border-bottom: 1px solid var(--color-border-light);
}
.table th {
    background: var(--color-bg-inset);
    font-weight: var(--fw-semibold);
    color: var(--color-text-soft);
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 1px solid var(--color-border);
}
.table tbody tr { transition: background var(--transition-fast); }
.table tbody tr:hover { background: var(--color-primary-lightest); }
.table tbody tr:last-child td { border-bottom: none; }
.table--hover tbody tr { cursor: default; }

/* ============= 答题结果 ============= */
.result-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-8);
    text-align: center;
    margin-bottom: var(--space-4);
    box-shadow: var(--shadow-sm);
}
.result-card__title { font-size: var(--text-xl); margin-bottom: var(--space-4); font-weight: var(--fw-bold); }
.result-card__stats { display: flex; justify-content: center; gap: var(--space-8); margin: var(--space-4) 0; flex-wrap: wrap; }
.result-card__stat { text-align: center; }
.result-card__stat .num { display: block; font-size: var(--text-4xl); font-weight: var(--fw-bold); color: var(--color-primary); font-variant-numeric: tabular-nums; line-height: 1.1; }
.result-card__stat .label { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.03em; }
.result-card__actions { margin-top: var(--space-4); display: flex; justify-content: center; gap: var(--space-2); flex-wrap: wrap; }

.result-question {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    margin-bottom: var(--space-3);
    transition: box-shadow var(--transition-fast);
}
.result-question:hover { box-shadow: var(--shadow-sm); }
.result-question__head { display: flex; gap: var(--space-2); align-items: center; margin-bottom: var(--space-2); flex-wrap: wrap; }
.result-question__no { font-weight: var(--fw-bold); margin-right: 4px; color: var(--color-text-muted); }
.result-question__stem { line-height: 1.8; margin-bottom: var(--space-2); color: var(--color-text); }
.result-question__answer { background: var(--color-bg-inset); padding: var(--space-3); border-radius: var(--radius); font-size: var(--text-sm); line-height: 1.8; border: 1px solid var(--color-border); }
.result-question__answer div { margin-bottom: 6px; }
.result-question__answer strong { color: var(--color-text-soft); }

/* ============= 错误页 ============= */
.error-page {
    text-align: center;
    padding: var(--space-16) var(--space-4);
}
.error-page__code { font-size: 80px; font-weight: var(--fw-bold); color: var(--color-primary); line-height: 1; letter-spacing: -0.04em; }
.error-page__title { font-size: var(--text-xl); margin: var(--space-3) 0 6px; font-weight: var(--fw-bold); }
.error-page__message { color: var(--color-text-muted); margin-bottom: var(--space-4); }

/* ============= 试卷详情 ============= */
.paper-detail__head { margin-bottom: var(--space-4); padding-bottom: var(--space-4); border-bottom: 1px solid var(--color-border); }
.paper-detail__title { font-size: var(--text-xl); margin-bottom: var(--space-3); font-weight: var(--fw-bold); letter-spacing: -0.01em; }
.paper-detail__tags { display: flex; gap: 4px; flex-wrap: wrap; }
.paper-detail__note { margin-top: var(--space-3); padding: var(--space-3); background: var(--color-bg-inset); border-radius: var(--radius); border: 1px solid var(--color-border); font-size: var(--text-sm); color: var(--color-text-soft); }
.paper-detail__actions { margin: var(--space-4) 0; display: flex; gap: var(--space-2); flex-wrap: wrap; }
.paper-detail__questions h3 { margin-bottom: var(--space-3); font-weight: var(--fw-bold); display: flex; align-items: center; gap: 6px; }
.paper-question-list { list-style: none; padding: 0; counter-reset: q-counter; }
.paper-question-list li { padding: var(--space-3) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius); margin-bottom: 8px; counter-increment: q-counter; background: #fff; transition: border-color var(--transition-fast); }
.paper-question-list li:hover { border-color: var(--color-primary-border); }
.paper-question-list li::before { content: counter(q-counter); display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; background: var(--color-primary-light); color: var(--color-primary-active); border-radius: var(--radius-full); font-size: var(--text-xs); font-weight: var(--fw-semibold); margin-right: var(--space-2); }
.paper-question-list__head { display: flex; justify-content: space-between; align-items: center; gap: var(--space-2); flex-wrap: wrap; }
.paper-question-list__stem { color: var(--color-text); flex: 1; }
.paper-question-list__tags { display: flex; gap: 4px; flex-shrink: 0; }
.paper-detail__answer-area h3 { margin: var(--space-4) 0 var(--space-3); font-weight: var(--fw-bold); display: flex; align-items: center; gap: 6px; }
.paper-question-form { background: var(--color-bg-inset); padding: var(--space-4); border-radius: var(--radius-md); margin-bottom: var(--space-3); border: 1px solid var(--color-border); }
.paper-question-form__stem { font-size: var(--text-md); line-height: 1.7; margin-bottom: var(--space-2); color: var(--color-text); }

/* ============= Toast ============= */
.toast {
    position: fixed;
    top: var(--space-5);
    right: var(--space-5);
    z-index: var(--z-toast);
    background: #fff;
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    box-shadow: var(--shadow-lg);
    max-width: 360px;
    font-size: var(--text-sm);
    display: flex;
    align-items: center;
    gap: 8px;
}
.toast--success { border-left-color: var(--color-success); }
.toast--error { border-left-color: var(--color-error); }

/* ============= 进度条 ============= */
.progress {
    width: 100%;
    height: 6px;
    background: var(--color-bg-soft);
    border-radius: var(--radius-full);
    overflow: hidden;
}
.progress__bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

/* ============= 分隔线 ============= */
.divider {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--space-4) 0;
}
.divider--dashed { border-top-style: dashed; }

/* ============= 可折叠面板 ============= */
.collapse { border: 1px solid var(--color-border); border-radius: var(--radius-md); overflow: hidden; }
.collapse__head { padding: var(--space-3) var(--space-4); background: var(--color-bg-inset); cursor: pointer; display: flex; justify-content: space-between; align-items: center; font-weight: var(--fw-medium); font-size: var(--text-sm); }
.collapse__head:hover { background: var(--color-bg-hover); }
.collapse__body { padding: var(--space-4); display: none; }
.collapse--open .collapse__body { display: block; }

/* ============= 行内 SVG 图标尺寸 ============= */
.icon-inline { display: inline-flex; align-items: center; justify-content: center; }
.icon-inline svg { width: 1em; height: 1em; }

/* ============= 练习页增强 ============= */
.practice__timer {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 8px 14px;
    background: var(--color-bg-inset);
    border-radius: var(--radius);
    margin-bottom: var(--space-3);
    font-size: var(--text-sm);
}
.practice__timer .timer-label { color: var(--color-text-muted); display: inline-flex; align-items: center; gap: 4px; }
.practice__timer .timer-value { font-family: "SF Mono", "JetBrains Mono", monospace; font-weight: var(--fw-semibold); color: var(--color-text); font-variant-numeric: tabular-nums; }
.practice__timer .timer-divider { color: var(--color-border-dark); margin: 0 4px; }

.practice__intensive { margin-top: 8px; }
.intensive-bar {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 8px 12px;
    background: var(--color-primary-lightest);
    border-radius: var(--radius);
    border: 1px solid var(--color-primary-100);
    font-size: var(--text-sm);
    flex-wrap: wrap;
}
.intensive-label { font-weight: var(--fw-semibold); color: var(--color-primary-hover); display: inline-flex; align-items: center; gap: 4px; }
.intensive-time { color: var(--color-text-soft); font-family: monospace; }
.intensive-time strong { color: var(--color-primary); }

.practice__dictation {
    margin-top: var(--space-4);
    padding: var(--space-4);
    background: var(--color-primary-lightest);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-primary-100);
}
.dictation-area { margin-top: var(--space-2); }
.dictation-area textarea { font-family: "SF Mono", "Consolas", monospace; line-height: 1.8; }
.dictation-area .btn { margin-top: 8px; margin-right: 6px; }
.dictation-compare {
    margin-top: 12px;
    padding: 12px;
    background: #fff;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}
.dictation-compare h4 { font-size: var(--text-sm); margin-bottom: 6px; }
.dictation-compare pre { white-space: pre-wrap; font-size: var(--text-sm); line-height: 1.8; color: var(--color-text-soft); }

.practice__transcript-panel {
    margin-top: var(--space-4);
    padding: var(--space-4);
    background: var(--color-bg-inset);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}
.transcript-show { margin-top: var(--space-2); }

/* 答案正确/错误高亮 */
.option-list li.option--correct { border-color: var(--color-success); background: var(--color-success-bg); }
.option-list li.option--wrong { border-color: var(--color-error); background: var(--color-error-bg); }
.option-list li.option--correct .option-item__label { color: var(--color-success); }

/* 提交结果 */
.practice__result .result-correct { color: var(--color-success); font-size: var(--text-xl); font-weight: var(--fw-bold); display: flex; align-items: center; gap: 8px; }
.practice__result .result-wrong { color: var(--color-error); font-size: var(--text-xl); font-weight: var(--fw-bold); display: flex; align-items: center; gap: 8px; }
.practice__result .result-detail { margin-top: 12px; padding: 12px; background: #fff; border-radius: var(--radius); border: 1px solid var(--color-border); }

/* ============= 试卷计时考试 ============= */
.exam-timer-bar {
    position: sticky;
    top: var(--header-h);
    z-index: 90;
    background: var(--color-primary);
    color: #fff;
    padding: 8px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--text-sm);
    box-shadow: var(--shadow-sm);
}
.exam-timer-bar .exam-time { font-family: monospace; font-size: var(--text-md); font-weight: var(--fw-bold); font-variant-numeric: tabular-nums; }
.exam-timer-bar .exam-time--warning { color: #fde047; animation: pulse 1s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.6; } }

.answer-card {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 100;
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    width: 280px;
    max-height: 400px;
    overflow-y: auto;
    display: none;
}
.answer-card--open { display: block; }
.answer-card__head { padding: 10px 14px; border-bottom: 1px solid var(--color-border); font-weight: var(--fw-semibold); display: flex; justify-content: space-between; align-items: center; }
.answer-card__grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; padding: 14px; }
.answer-card__item {
    width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    border-radius: var(--radius);
    font-size: var(--text-sm); font-weight: var(--fw-medium);
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: all var(--transition-fast);
}
.answer-card__item--answered { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.answer-card__item--current { border-color: var(--color-primary); border-width: 2px; }
.answer-card__item:hover { border-color: var(--color-primary); }

.answer-card__toggle {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 99;
    width: 48px; height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    border: none;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    font-size: var(--text-sm);
    font-weight: var(--fw-bold);
}

/* ============= 签到/积分 ============= */
.checkin-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    text-align: center;
}
.checkin-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 28px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    color: #fff;
    font-size: var(--text-md);
    font-weight: var(--fw-bold);
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition);
}
.checkin-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.checkin-btn:disabled { background: var(--color-border); box-shadow: none; cursor: default; transform: none; }
.checkin-streak {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin: 16px 0;
    flex-wrap: wrap;
}
.checkin-day {
    width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%;
    border: 2px solid var(--color-border);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}
.checkin-day--done { background: var(--color-success); color: #fff; border-color: var(--color-success); }
.checkin-day--today { border-color: var(--color-primary); border-width: 3px; }

.points-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    background: var(--color-warning-bg);
    color: var(--color-warning-hover);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: var(--fw-semibold);
    border: 1px solid var(--color-warning-border);
}

/* ============= 章节型听力题库 ============= */
.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}
.skip-link {
    position: fixed;
    top: 8px;
    left: 8px;
    z-index: var(--z-toast);
    padding: 10px 14px;
    border-radius: var(--radius);
    background: #fff;
    color: var(--color-primary-active);
    box-shadow: var(--shadow-lg);
    transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.questions-page {
    --directory-accent: #0f766e;
    --directory-accent-soft: #ecfdf5;
    --directory-accent-border: #99f6e4;
    letter-spacing: 0;
}
.questions-page__head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--space-4);
    margin: var(--space-2) 0 var(--space-5);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border);
}
.questions-page__head h1 {
    font-size: var(--text-2xl);
    line-height: 1.3;
    font-weight: var(--fw-bold);
    letter-spacing: 0;
}
.questions-page__head p { margin-top: 4px; color: var(--color-text-muted); font-size: var(--text-sm); }
.questions-page__head p strong { color: var(--color-text); font-variant-numeric: tabular-nums; }
.questions-workspace {
    display: block;
}
.questions-content { min-width: 0; }

.question-filter-form { min-width: 0; }
.question-search {
    position: relative;
    display: grid;
    grid-template-columns: minmax(160px, 1fr) auto auto;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}
.question-search__icon {
    position: absolute;
    top: 21px;
    left: 12px;
    z-index: 1;
    color: var(--color-text-muted);
    transform: translateY(-50%);
    pointer-events: none;
}
.question-search input[type="search"] { min-width: 0; height: 42px; padding-left: 40px; background: #fff; }
.question-search .btn { min-height: 42px; }

.question-filters {
    overflow: hidden;
    margin-bottom: var(--space-5);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: #fff;
    box-shadow: var(--shadow-xs);
}
.question-filters__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 44px;
    padding: 8px var(--space-3);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-hover);
}
.question-filters__head h2 {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-size: var(--text-md);
    font-weight: var(--fw-semibold);
    letter-spacing: 0;
}
.question-filters__head h2 .icon { color: var(--color-primary); }
.question-filters__head > span { color: var(--color-text-muted); font-size: var(--text-xs); font-variant-numeric: tabular-nums; }

.filter-row {
    display: grid;
    grid-template-columns: 72px minmax(0, 1fr);
    gap: var(--space-2);
    align-items: start;
    min-width: 0;
    margin: 0;
    padding: 10px var(--space-3);
    border: 0;
    border-bottom: 1px solid var(--color-border-light);
}
.filter-row legend {
    float: left;
    width: 72px;
    padding: 3px 0 0;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    line-height: 26px;
}
.filter-row__options { display: flex; flex: 1; flex-wrap: wrap; gap: 3px 8px; min-width: 0; }
.filter-link { position: relative; display: inline-flex; cursor: pointer; }
.filter-link input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.filter-link span {
    display: inline-flex;
    align-items: center;
    min-height: 26px;
    padding: 1px 8px;
    border: 1px solid transparent;
    border-radius: 3px;
    color: var(--color-text-soft);
    font-size: var(--text-sm);
    line-height: 1.45;
}
.filter-link:hover span { color: var(--color-primary); background: var(--color-primary-lightest); }
.filter-link input:focus-visible + span { outline: 2px solid var(--color-primary); outline-offset: 1px; }
.filter-link.is-active span { border-color: var(--color-primary); background: var(--color-primary); color: #fff; }
/* Secondary question-type choices are rendered as a compact directory child. */
.filter-row:has(input[name="classification_subtype"]) {
    grid-template-columns: 56px minmax(0, 1fr);
    margin: -1px 0 0 80px;
    padding: 6px var(--space-3) 7px;
    border-left: 2px solid var(--color-primary-border);
    border-bottom: 1px solid var(--color-border-light);
    background: var(--color-bg-soft);
}
.filter-row:has(input[name="classification_subtype"]) legend {
    width: 56px;
    padding-top: 1px;
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    line-height: 24px;
}
.filter-row:has(input[name="classification_subtype"]) .filter-row__options { gap: 2px 6px; }
.filter-row:has(input[name="classification_subtype"]) .filter-link span {
    min-height: 24px;
    padding: 1px 7px;
    color: var(--color-text-muted);
    font-size: var(--text-xs);
}
.filter-row:has(input[name="classification_subtype"]) .filter-link.is-active span {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    color: var(--color-primary-strong, var(--color-primary));
}
.filter-row--textbook { grid-template-columns: 1fr; align-items: center; }
.filter-row--textbook .textbook-filter { grid-column: 1; }
.textbook-filter {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2);
    min-height: 44px;
}
.textbook-field {
    display: grid;
    grid-template-columns: auto minmax(144px, 1fr);
    align-items: center;
    min-height: 44px;
    overflow: hidden;
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-sm);
    background: #fff;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.textbook-field:hover { border-color: var(--color-primary-border); }
.textbook-field:focus-within { border-color: var(--color-primary); box-shadow: 0 0 0 2px var(--color-primary-light); }
.textbook-field.has-selection { border-color: var(--color-primary-border); background: var(--color-primary-lightest); }
.textbook-field__label {
    align-self: stretch;
    display: inline-flex;
    align-items: center;
    padding: 0 10px;
    border-right: 1px solid var(--color-border-light);
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-weight: var(--fw-medium);
    white-space: nowrap;
}
.textbook-field select {
    width: 100%;
    min-width: 0;
    min-height: 42px;
    padding: 6px 32px 6px 10px;
    border: 0;
    border-radius: 0;
    outline: 0;
    background: transparent;
    color: var(--color-text-soft);
    font-size: var(--text-sm);
    font-weight: var(--fw-medium);
    cursor: pointer;
}
.textbook-field.has-selection select { color: var(--color-primary-active); }
.textbook-filter__connector {
    width: 8px;
    height: 8px;
    border-top: 1.5px solid var(--color-text-muted);
    border-right: 1.5px solid var(--color-text-muted);
    transform: rotate(45deg);
}
.filter-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px 8px;
    min-height: 44px;
    padding: 8px var(--space-3);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
}
.filter-checkbox {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 28px;
    margin-right: var(--space-3);
    color: var(--color-text-soft);
    font-size: var(--text-sm);
    cursor: pointer;
}
.filter-checkbox input { width: 16px; height: 16px; accent-color: var(--color-primary); }
.filter-checkbox--locked { color: var(--color-text-muted); cursor: default; }
.filter-checkbox--locked input { accent-color: var(--color-border); cursor: not-allowed; }
.filter-checkbox__login { color: var(--color-primary); font-size: var(--text-xs); text-decoration: none; }
.filter-checkbox__login:hover { text-decoration: underline; }

.filter-segment {
    display: grid;
    grid-template-columns: 72px minmax(0, 1fr);
    gap: var(--space-2);
    align-items: center;
    min-width: 0;
    padding: 10px var(--space-3);
    border: 0;
    border-bottom: 1px solid var(--color-border-light);
}
.filter-segment legend {
    float: left;
    width: 72px;
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    font-weight: var(--fw-medium);
}
.filter-segment__options { display: flex; flex-wrap: wrap; gap: 6px; min-width: 0; }
.filter-chip { position: relative; cursor: pointer; }
.filter-chip input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.filter-chip span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 5px 13px;
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--color-text-soft);
    font-size: var(--text-sm);
    line-height: 1.25;
    transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
    user-select: none;
}
.filter-chip:hover span { border-color: var(--color-primary-border); color: var(--color-primary); }
.filter-chip input:focus-visible + span { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.filter-chip.is-active span { border-color: var(--color-primary); background: var(--color-primary); color: #fff; }

.filter-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-3);
    padding: var(--space-3);
}
.filter-field { min-width: 0; }
.filter-field label {
    display: block;
    margin-bottom: 4px;
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    font-weight: var(--fw-medium);
}
.filter-field select {
    height: 38px;
    min-width: 0;
    padding-top: 6px;
    padding-bottom: 6px;
    font-size: var(--text-sm);
    text-overflow: ellipsis;
}
.question-filters__more { border-bottom: 1px solid var(--color-border-light); }
.question-filters__more summary {
    display: flex;
    align-items: center;
    min-height: 42px;
    padding: 8px var(--space-3);
    color: var(--color-primary);
    font-size: var(--text-sm);
    font-weight: var(--fw-medium);
    cursor: pointer;
    list-style-position: inside;
}
.question-filters__more summary:hover { background: var(--color-primary-lightest); }
.question-filters__more summary:focus-visible { outline: 2px solid var(--color-primary); outline-offset: -2px; }
.question-filters__more .filter-row { padding-left: var(--space-4); background: var(--color-bg-soft); }
.question-filters__more .filter-toggle { margin: 0 var(--space-4) var(--space-3); }
.filter-grid--more { padding-top: 0; }
.filter-toggle {
    display: flex;
    align-items: center;
    align-self: end;
    gap: var(--space-2);
    min-height: 38px;
    color: var(--color-text-soft);
    font-size: var(--text-sm);
    cursor: pointer;
}
.filter-toggle input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.filter-toggle__control {
    position: relative;
    width: 38px;
    height: 22px;
    flex: 0 0 38px;
    border-radius: var(--radius-full);
    background: var(--color-border-dark);
    transition: background var(--transition-fast);
}
.filter-toggle__control::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #fff;
    box-shadow: var(--shadow-xs);
    transition: transform var(--transition-fast);
}
.filter-toggle input:checked + .filter-toggle__control { background: var(--directory-accent); }
.filter-toggle input:checked + .filter-toggle__control::after { transform: translateX(16px); }
.filter-toggle input:focus-visible + .filter-toggle__control { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.question-filter-form[aria-busy="true"] .question-filters,
.question-filter-form[aria-busy="true"] .question-search { opacity: 0.65; }

.question-results:focus { outline: none; }
.question-results:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 4px; }
.question-results__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
    padding-bottom: var(--space-2);
    border-bottom: 2px solid var(--directory-accent);
}
.question-results__head h2 { font-size: var(--text-lg); font-weight: var(--fw-semibold); letter-spacing: 0; }
.question-results__head span { color: var(--color-text-muted); font-size: var(--text-xs); font-variant-numeric: tabular-nums; }
.question-results__refresh {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
    color: var(--color-primary);
    font-size: var(--text-sm);
    font-weight: var(--fw-medium);
}
.question-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
.question-card--listening {
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 248px;
    padding: var(--space-3);
    border-radius: var(--radius);
}
.question-card--listening:hover { transform: none; border-color: var(--color-border-dark); box-shadow: var(--shadow-sm); }
.question-card--listening .question-card__head { min-height: 26px; }
.question-card__number { color: var(--color-text-muted); font-size: var(--text-sm); font-weight: var(--fw-semibold); margin-right: 2px; }
.question-card--listening .question-card__stem {
    display: -webkit-box;
    min-height: 66px;
    margin: var(--space-3) 0;
    overflow: hidden;
    color: var(--color-text);
    font-size: var(--text-base);
    font-weight: var(--fw-medium);
    line-height: 1.6;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    letter-spacing: 0;
}
.question-card--listening .question-card__meta { margin-top: auto; gap: 6px var(--space-3); }
.question-card--listening .question-card__meta .icon-xs { color: var(--color-text-light); }
.question-card--listening .question-card__rate { color: var(--color-primary); }
.question-card--listening .question-card__footer { justify-content: flex-end; }

.question-show-page { letter-spacing: 0; }
.question-detail__audio h2,
.question-detail__options h2,
.question-detail__attrs h2,
.related > h2 {
    display: flex;
    align-items: center;
    gap: 7px;
    margin-bottom: var(--space-2);
    font-size: var(--text-lg);
    font-weight: var(--fw-semibold);
    letter-spacing: 0;
}
.chapter-path-list,
.attr-chapter-list {
    display: grid;
    gap: 5px;
    margin: 0;
    padding-left: 20px;
    color: var(--color-text-soft);
    font-size: var(--text-sm);
}
.attr-table-wrap { overflow-x: auto; }
.question-detail__answer summary { min-height: 44px; }

.question-answer-form {
    margin: var(--space-5) 0;
    padding-block: var(--space-4);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}
.question-answer-form > h2 {
    display: flex;
    align-items: center;
    gap: 7px;
    margin-bottom: var(--space-3);
    font-size: var(--text-lg);
}
.option-item { min-height: 44px; align-items: center; }
.option-item input[type="radio"], .option-item input[type="checkbox"] { width: 18px; height: 18px; margin-top: 0; flex: 0 0 18px; }
.option-item:has(input:checked) { color: var(--color-primary); }
.option-list li:has(input:checked) { border-color: var(--color-primary); background: var(--color-primary-lightest); }

.feedback-modal[hidden] { display: none; }
.feedback-modal {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    background: rgba(17, 24, 39, 0.48);
}
.feedback-modal.is-open { display: flex; }
.feedback-modal__panel {
    width: min(480px, 100%);
    max-height: min(680px, 90vh);
    overflow-y: auto;
    padding: var(--space-5);
    border-radius: var(--radius-md);
    background: #fff;
    box-shadow: var(--shadow-lg);
}
.dialog-head, .dialog-actions { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); }
.dialog-head { margin-bottom: var(--space-4); }
.dialog-head h2 { margin: 0; font-size: var(--text-lg); }
.dialog-actions { justify-content: flex-end; margin-top: var(--space-4); }
.form-message { min-height: 22px; color: var(--color-text-muted); font-size: var(--text-sm); }

.profile-settings { max-width: 860px; margin-inline: auto; }
.profile-settings__form { display: grid; gap: var(--space-5); }
.form-section { margin: 0; padding: 0; border: 0; }
.form-section legend { width: 100%; margin-bottom: var(--space-3); padding-bottom: var(--space-2); border-bottom: 1px solid var(--color-border); font-weight: var(--fw-semibold); }

@media (max-width: 1100px) {
    .filter-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .question-list { grid-template-columns: 1fr; }
    .question-card--listening { min-height: 220px; }
}

@media (max-width: 900px) {
    .questions-page__chapter-button { display: none; }
    .questions-workspace { display: block; }
}

@media (max-width: 700px) {
    .questions-page__head { align-items: center; margin-top: 0; }
    .questions-page__head h1 { font-size: var(--text-xl); }
    .question-search { grid-template-columns: minmax(0, 1fr) auto auto; }
    .question-search input[type="search"],
    .filter-field select { font-size: 16px; }
    .filter-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
    .filter-chip span { min-height: 44px; padding: 8px 14px; }
    .filter-field select { height: 44px; }
    .filter-toggle { min-height: 44px; }
    .question-card--listening { min-height: 0; }
    .questions-page .question-card__footer .btn { min-height: 44px; padding-inline: 14px; }
    .home-banner { min-height: 210px; }
    .home-banner__link img { height: 210px; }
    .home-banner.home-banner--compact { height: 150px; min-height: 150px; }
    .home-banner--compact .home-banner__link img { height: 150px; }
    .home-banner__caption { left: var(--space-4); bottom: var(--space-4); max-width: 75%; }
    .home-banner__caption strong { font-size: var(--text-lg); }
    .practice__group { align-items: flex-start; flex-direction: column; }
    .practice__group ol { justify-content: flex-start; }
    .questions-page .pagination li a { min-width: 44px; height: 44px; }
    .question-show-page .question-detail__actions .btn { min-height: 44px; }
    .feedback-modal__panel { padding: var(--space-4); }
    .dialog-actions .btn { min-height: 44px; }
}

@media (max-width: 560px) {
    .questions-page__head { flex-wrap: wrap; }
    .question-search { grid-template-columns: 1fr 1fr; position: relative; }
    .question-search input[type="search"] { grid-column: 1 / -1; }
    .question-search .btn { width: 100%; min-height: 44px; }
    .question-search .btn--primary:last-child { grid-column: 1 / -1; }
    .filter-segment { grid-template-columns: 1fr; }
    .filter-segment legend { float: none; width: auto; }
    .filter-segment .filter-chip span { min-height: 44px; }
    .filter-row { grid-template-columns: 1fr; gap: 0; padding: 10px var(--space-3); }
    .filter-row:has(input[name="classification_subtype"]) { grid-template-columns: 1fr; margin: 0; padding: 7px var(--space-3) 8px; border-left: 0; }
    .filter-row legend { float: none; width: auto; padding: 0; line-height: 1.6; }
    .filter-row:has(input[name="classification_subtype"]) legend { width: auto; padding: 0; line-height: 1.6; }
    .filter-link span { min-height: 36px; padding: 5px 10px; }
    .textbook-filter { display: grid; grid-template-columns: 1fr; width: 100%; gap: var(--space-2); }
    .textbook-field { width: 100%; min-height: 44px; grid-template-columns: auto minmax(0, 1fr); }
    .textbook-field select { min-height: 42px; }
    .textbook-filter__connector { display: none; }
    .filter-checkbox { width: auto; margin-right: var(--space-3); min-height: 40px; }
    .question-filters__more .filter-row { padding-left: var(--space-3); }
    .filter-grid { grid-template-columns: 1fr; }
    .question-filters__more summary { min-height: 44px; }
    .question-card--listening .question-card__footer { display: grid; grid-template-columns: 1fr 1fr; }
    .question-show-page .attr-table-wrap { overflow: visible; }
    .question-show-page .attr-table,
    .question-show-page .attr-table tbody,
    .question-show-page .attr-table tr { display: block; width: 100%; }
    .question-show-page .attr-table tr {
        display: grid;
        grid-template-columns: 96px minmax(0, 1fr);
        border-bottom: 1px solid var(--color-border-light);
    }
    .question-show-page .attr-table th,
    .question-show-page .attr-table td { display: block; width: auto; min-width: 0; overflow-wrap: anywhere; }
}

@media (prefers-reduced-motion: reduce) {
    .filter-chip span,
    .filter-toggle__control,
    .filter-toggle__control::after { transition: none; }
}

/* Keep structural overrides after the legacy stylesheet. */
.site-header__inner {
    display: grid;
    grid-template-columns: minmax(190px, auto) auto minmax(180px, 1fr) auto;
    gap: var(--space-4);
}
.site-header__nav { min-width: 330px; justify-content: center; }
.site-header__nav a { min-height: 38px; white-space: nowrap; }
.site-header__search { justify-self: stretch; max-width: 340px; width: 100%; }
.site-header__user { justify-self: end; }
.site-header__brand .logo, .mobile-tabbar__fab { background: var(--color-primary); }
.site-footer__col h4 { letter-spacing: 0; text-transform: none; }
.site-footer__copy { justify-content: flex-start; gap: var(--space-4); }
@media (max-width: 1100px) {
    .site-header__inner { grid-template-columns: auto auto 1fr; }
    .site-header__search { display: none; }
}
@media (max-width: 768px) {
    .site-header__inner { display: flex; }
}

/* CSRF-protected logout keeps the existing header button geometry. */
.header-logout-form { display: inline-flex; margin: 0; }
.header-logout-form .btn { border: 0; cursor: pointer; font: inherit; }