/* 跨境电商学堂 · 视觉规范（Module 1）
   主色：深绿 / 青绿 / 暖白，金色少量强调
   所有间距、圆角、阴影集中为变量，便于后续统一维护 */

:root {
  --green-950: #07281f;
  --green-900: #0b3a2c;
  --green-800: #104a39;
  --teal-700: #0e6150;
  --teal-600: #12806b;
  --teal-500: #17957c;
  --teal-200: #c3e6d9;
  --teal-050: #eaf5f0;

  --cream: #faf7f0;
  --paper: #ffffff;
  --gold: #c8a24a;
  --gold-soft: #f2e6c8;

  --ink: #17231f;
  --ink-2: #33443d;
  --muted: #5f7169;
  --line: rgba(11, 58, 44, 0.12);
  --line-strong: rgba(11, 58, 44, 0.22);

  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-sm: 0 1px 2px rgba(7, 40, 31, 0.06), 0 2px 8px rgba(7, 40, 31, 0.04);
  --shadow-md: 0 8px 24px rgba(7, 40, 31, 0.08);
  --shadow-nav: 0 10px 30px rgba(7, 40, 31, 0.18);

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  --font-sans: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans", Tahoma, Arial, sans-serif;
  --font-ar: "Segoe UI", Tahoma, "Noto Naskh Arabic", "Geeza Pro", sans-serif;

  --nav-h: 68px;
  --topbar-h: 64px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--cream);
  padding-bottom: calc(var(--nav-h) + 44px + env(safe-area-inset-bottom));
}

html[dir="rtl"] body { font-family: var(--font-ar); }

img { max-width: 100%; display: block; }
a { color: var(--teal-700); text-decoration: none; }
a:hover { text-decoration: underline; }

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
  border-radius: 6px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; inset-inline-start: 16px; top: -60px; z-index: 200;
  background: var(--gold); color: var(--green-950); padding: 10px 16px;
  border-radius: var(--radius-sm); font-weight: 650; transition: top .15s;
}
.skip-link:focus { top: 12px; }

.wrap { width: min(1120px, 100% - 40px); margin-inline: auto; }

/* ---------------- 顶部 */
.topbar {
  background: var(--green-900);
  color: #fff;
  position: sticky; top: 0; z-index: 60;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.topbar-inner {
  display: flex; align-items: center; gap: var(--space-4);
  min-height: var(--topbar-h);
}
.brand { display: flex; align-items: center; gap: 10px; color: #fff; flex: 0 0 auto; }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 11px;
  background: linear-gradient(145deg, var(--teal-500), var(--green-800));
  display: grid; place-items: center; color: var(--gold-soft);
  border: 1px solid rgba(255,255,255,.18);
}
.brand-text { font-weight: 700; letter-spacing: .2px; font-size: 1rem; }

.search {
  flex: 1 1 auto; max-width: 460px;
  display: flex; align-items: center;
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 999px; padding-inline: 6px 4px;
}
.search input[type="search"] {
  flex: 1; min-width: 0; background: transparent; border: 0; outline: none;
  color: #fff; padding: 9px 12px; font: inherit; font-size: .92rem;
}
.search input::placeholder { color: rgba(255,255,255,.62); }
.search button {
  border: 0; background: rgba(255,255,255,.14); color: #fff;
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  cursor: pointer;
}
.search button:hover { background: rgba(255,255,255,.24); }

.top-actions { display: flex; align-items: center; gap: 10px; margin-inline-start: auto; }

.menu { position: relative; }
.menu-trigger {
  list-style: none; cursor: pointer; display: flex; align-items: center; gap: 8px;
  padding: 8px 12px; border-radius: 999px; border: 1px solid rgba(255,255,255,.2);
  font-size: .86rem; color: #fff; background: rgba(255,255,255,.06);
}
.menu-trigger::-webkit-details-marker { display: none; }
.lang-code { font-weight: 700; letter-spacing: .6px; color: var(--gold-soft); }
.menu-label { color: rgba(255,255,255,.8); }
.menu-panel {
  position: absolute; inset-inline-end: 0; top: calc(100% + 10px); z-index: 80;
  min-width: 220px; background: var(--paper); color: var(--ink);
  border-radius: var(--radius-md); box-shadow: var(--shadow-md);
  border: 1px solid var(--line); padding: 8px;
}
.menu-title {
  margin: 6px 10px 8px; font-size: .74rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted);
}
.menu-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 12px; border-radius: 9px; color: var(--ink); font-size: .93rem;
}
.menu-item:hover { background: var(--teal-050); text-decoration: none; }
.menu-item.is-active { background: var(--teal-050); font-weight: 650; color: var(--teal-700); }
.menu-code { font-size: .74rem; color: var(--muted); letter-spacing: .08em; }

.country-form select {
  appearance: none; background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.2); color: #fff;
  border-radius: 999px; padding: 8px 30px 8px 12px; font: inherit; font-size: .86rem;
  background-image: linear-gradient(45deg, transparent 50%, rgba(255,255,255,.7) 50%),
                    linear-gradient(135deg, rgba(255,255,255,.7) 50%, transparent 50%);
  background-position: right 14px center, right 9px center;
  background-size: 5px 5px, 5px 5px; background-repeat: no-repeat;
}
html[dir="rtl"] .country-form select {
  padding: 8px 12px 8px 30px;
  background-position: left 14px center, left 9px center;
}
.country-form option { color: var(--ink); }

.account {
  color: #fff; width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,.2); display: grid; place-items: center;
}

/* ---------------- 横幅 */
.hero {
  background:
    radial-gradient(1100px 420px at 12% -20%, rgba(23,149,124,.55), transparent 62%),
    radial-gradient(700px 340px at 92% 10%, rgba(200,162,74,.22), transparent 60%),
    linear-gradient(160deg, var(--green-950), var(--green-800) 58%, #0d5142);
  color: #fff;
  padding-block: var(--space-7) var(--space-8);
  position: relative; overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.75), transparent 85%);
  pointer-events: none;
}
.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
  gap: var(--space-7); align-items: end;
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .76rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--gold-soft); margin: 0 0 var(--space-3);
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--gold); }
.hero h1 {
  margin: 0 0 var(--space-3);
  font-size: clamp(1.85rem, 3.6vw, 2.85rem);
  line-height: 1.18; letter-spacing: -.01em;
}
.hero p.lede {
  margin: 0; max-width: 58ch; color: rgba(255,255,255,.86); font-size: 1.02rem;
}
.hero-side { display: grid; gap: var(--space-3); }
.hero-stat {
  border: 1px solid rgba(255,255,255,.18); border-radius: var(--radius-md);
  padding: 14px 16px; background: rgba(255,255,255,.06);
}
.hero-stat strong { display: block; font-size: 1.5rem; color: var(--gold-soft); line-height: 1.2; }
.hero-stat span { font-size: .82rem; color: rgba(255,255,255,.72); }

/* ---------------- 主体 */
.main { padding-block: var(--space-7) calc(var(--space-7) + 72px); }
.lang-notice {
  margin: 0 0 var(--space-5); padding: 10px 14px;
  background: var(--gold-soft); color: #6b5217;
  border-radius: var(--radius-sm); font-size: .86rem;
  border: 1px solid rgba(200,162,74,.4);
}

.section-head { display: flex; align-items: end; justify-content: space-between; gap: var(--space-4); margin-block: var(--space-7) var(--space-4); flex-wrap: wrap; }
.section-head:first-child { margin-top: 0; }
.section-head h2 { margin: 0; font-size: 1.32rem; letter-spacing: -.01em; }
.section-head p { margin: 4px 0 0; color: var(--muted); font-size: .92rem; }

.card {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
  padding: var(--space-5);
}
.card.tight { padding: var(--space-4); }
.card-title { margin: 0 0 6px; font-size: 1.05rem; }
.card-sub { margin: 0; color: var(--muted); font-size: .88rem; }

.grid { display: grid; gap: var(--space-4); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.country-grid {
  display: grid; gap: var(--space-4);
  grid-template-columns: repeat(auto-fill, minmax(232px, 1fr));
}

/* 筛选 chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: var(--space-5); }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px; border-radius: 999px; font-size: .86rem;
  border: 1px solid var(--line-strong); color: var(--ink-2); background: transparent;
}
.chip:hover { border-color: var(--teal-600); color: var(--teal-700); text-decoration: none; }
.chip.is-active { background: var(--green-900); border-color: var(--green-900); color: #fff; }

.filter-row { display: flex; gap: var(--space-3); flex-wrap: wrap; margin-bottom: var(--space-5); }
.filter-row input[type="search"], .filter-row select {
  padding: 10px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong); background: var(--paper);
  font: inherit; font-size: .92rem; color: var(--ink); min-width: 200px;
}

/* 国家卡：地标 / 产品 点击切换 */
.country-card { display: flex; flex-direction: column; overflow: hidden; padding: 0; }
.country-card .media { aspect-ratio: 16 / 10; }
.country-card .media img { transition: transform .45s ease, opacity .3s ease; }
.country-card:hover .media img { transform: scale(1.035); }
.media.flip {
  width: 100%; border: 0; padding: 0; cursor: pointer;
  font: inherit; text-align: start;
}
.media.flip .img-b { opacity: 0; }
.media.flip.is-b .img-b { opacity: 1; }
.media.flip.is-b .img-a { opacity: 0; }
.media.flip:focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; }
.media-tag, .media-hint {
  position: absolute; z-index: 3; border-radius: 999px;
  font-size: .68rem; padding: 3px 9px; line-height: 1.4;
  pointer-events: none;
}
.media-tag { inset-inline-start: 9px; top: 9px; background: rgba(7, 40, 31, .78); color: #fff; }
.media-hint { inset-inline-end: 9px; bottom: 9px; background: rgba(255, 255, 255, .92); color: var(--green-900); }
.country-card-body { padding: var(--space-4) var(--space-4) var(--space-5); display: flex; flex-direction: column; gap: 8px; flex: 1; }
.country-card h3 { margin: 0; font-size: 1.06rem; }
.country-card .meta { color: var(--muted); font-size: .84rem; display: flex; gap: 12px; flex-wrap: wrap; }
.country-card .card-actions { margin-top: auto; display: flex; gap: 8px; align-items: center; justify-content: space-between; flex-wrap: wrap; }

/* ---------- 世界栏目 ---------- */
.my-country {
  background: linear-gradient(120deg, rgba(234, 245, 240, .9), rgba(250, 247, 240, .9));
  border-block: 1px solid var(--line);
  padding-block: var(--space-5);
  margin-bottom: var(--space-5);
}
.my-country-inner {
  width: min(1120px, 100% - 40px); margin-inline: auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-5); flex-wrap: wrap;
}
.my-country-current { flex: 1 1 320px; min-width: 0; }
.my-country-current .eyebrow { margin: 0 0 6px; }
.my-country-pick { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.my-country-pick strong { display: block; font-size: 1.08rem; }
.my-country-pick .muted { display: block; }
.my-country-empty { margin: 0; color: var(--muted); font-size: .9rem; max-width: 62ch; }
.my-country-form { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.my-country-form select {
  padding: 10px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong); background: var(--paper);
  font: inherit; font-size: .9rem; color: var(--ink); max-width: 100%;
}
.world-section { margin-bottom: var(--space-7); }
.count-badge {
  display: inline-block; margin-inline-start: 6px; padding: 2px 9px;
  border-radius: 999px; background: var(--teal-050); color: var(--teal-700);
  font-size: .76rem; font-weight: 600; vertical-align: middle;
}
.card-name-en { margin: -2px 0 0; color: var(--muted); font-size: .8rem; letter-spacing: .02em; }
.card-product { margin: 2px 0 0; }
.card-question {
  margin-top: auto; padding: 10px 12px;
  border: 1px solid var(--teal-200); border-radius: 12px;
  background: var(--teal-050);
}
.card-question-label {
  display: block; margin-bottom: 4px;
  font-size: .68rem; font-weight: 700; letter-spacing: .09em;
  text-transform: uppercase; color: var(--teal-700);
}
.card-question p { margin: 0; font-size: .86rem; line-height: 1.5; color: var(--ink-2); }
.catalog-hint { margin-top: auto; }
.country-card.is-mine { border-color: var(--gold); box-shadow: 0 0 0 1px var(--gold), var(--shadow-sm); }
.btn-icon {
  width: 34px; height: 34px; display: inline-grid; place-items: center;
  border: 1px solid var(--line-strong); border-radius: 50%;
  background: transparent; color: var(--muted); font-size: 1rem; cursor: pointer;
}
.btn-icon:hover { border-color: var(--gold); color: var(--gold); }
.btn-icon.is-on { color: var(--gold); border-color: var(--gold); background: var(--gold-soft); }
.badge-market { background: #eef4fb; color: #315a86; border: 1px solid #cfe0f0; }
.badge-catalog { background: #f6f1e2; color: #7a5f14; border: 1px solid #e8d9a8; }

/* 详情与投稿 */
.catalog-notice {
  padding: 14px 18px; margin-bottom: var(--space-5);
  border: 1px solid #e8d9a8; border-inline-start: 4px solid var(--gold);
  border-radius: 12px; background: #faf5e8;
}
.catalog-notice strong { display: block; margin-bottom: 4px; font-size: .92rem; }
.catalog-notice p { margin: 0; color: var(--ink-2); font-size: .88rem; line-height: 1.55; }
.media-pending { font-size: .92rem; font-weight: 600; letter-spacing: .05em; }
.info-card { padding: 18px; }
.card-kicker {
  display: block; margin-bottom: 6px;
  font-size: .7rem; font-weight: 700; letter-spacing: .09em;
  text-transform: uppercase; color: var(--teal-700);
}
.info-card p { margin: 0; font-size: .9rem; line-height: 1.6; }
.subhead { margin: 0 0 8px; font-size: .95rem; }
.question-card { display: flex; gap: 12px; align-items: flex-start; }
.question-card p { margin: 0; font-size: .92rem; line-height: 1.6; }
.question-no {
  flex: 0 0 auto; width: 34px; height: 34px; display: grid; place-items: center;
  border-radius: 50%; background: var(--green-900); color: #fff;
  font-size: .76rem; font-weight: 700; letter-spacing: .03em;
}
.china-link-card { border-inline-start: 4px solid var(--gold); }
.china-link-card p { margin: 0; line-height: 1.65; }
.term-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.notice { padding: 12px 16px; border-radius: 12px; margin-bottom: var(--space-4); font-size: .9rem; }
.notice-ok { background: var(--teal-050); border: 1px solid var(--teal-200); color: var(--teal-700); }
.notice-warn { background: #fdf3e6; border: 1px solid #eed3ae; color: #8a5a1a; }
.contribute-form { max-width: 720px; display: flex; flex-direction: column; gap: 14px; }
.form-row { display: grid; gap: 6px; }
.form-row label { font-size: .84rem; font-weight: 600; }
.form-row input, .form-row select, .form-row textarea {
  padding: 10px 12px; border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm); background: var(--paper);
  font: inherit; font-size: .92rem; color: var(--ink);
}
.form-row textarea { resize: vertical; min-height: 110px; }
.compare-note {
  padding: 12px 16px; margin-bottom: var(--space-4);
  border: 1px solid var(--teal-200); border-radius: 12px;
  background: var(--teal-050); color: var(--teal-700); font-size: .88rem;
}
.cmp-head { display: inline-flex; align-items: center; gap: 8px; }

/* ---------- 中国货源（Module 4） ---------- */
.type-legend {
  display: grid; gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  margin-bottom: var(--space-4);
}
.type-legend-item {
  padding: 10px 12px; border: 1px solid var(--line);
  border-radius: 12px; background: var(--paper);
}
.type-legend-item strong { display: block; font-size: .84rem; margin-bottom: 2px; }
.type-legend-item span { color: var(--muted); font-size: .78rem; line-height: 1.45; }
.case-card { display: flex; flex-direction: column; gap: 8px; }
.case-card h3 { margin: 0; font-size: 1.05rem; }
.case-card h3 a { color: var(--ink); }
.case-card .card-actions { margin-top: auto; }
.case-card .meta { display: flex; gap: 8px; flex-wrap: wrap; }

/* ---------- 课程内容（Module 5） ---------- */
.entry-cards { margin-bottom: var(--space-5); }
.entry-card { text-decoration: none; color: inherit; transition: border-color .2s, transform .2s; }
.entry-card:hover { border-color: var(--teal-600); transform: translateY(-2px); text-decoration: none; }
.entry-card h2 { margin: 4px 0 6px; font-size: 1.15rem; }
.entry-card p { margin: 0; color: var(--muted); font-size: .88rem; }
.lesson-row { align-items: center; }
.lesson-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: var(--space-5); }
.lesson-actions form { display: inline-flex; }
.objective-list { margin: 0; padding-inline-start: 20px; display: grid; gap: 6px; line-height: 1.6; }
.concept-grid { display: grid; gap: var(--space-4); grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.concept-card h3 { margin: 0 0 10px; font-size: 1.02rem; color: var(--teal-700); }
.concept-kv { display: grid; grid-template-columns: 88px 1fr; gap: 8px 12px; margin: 0; font-size: .88rem; line-height: 1.6; }
.concept-kv dt { color: var(--muted); font-weight: 600; }
.concept-kv dd { margin: 0; }
.case-study h3 { margin: 0 0 8px; font-size: 1.02rem; }
.case-study p { margin: 0; line-height: 1.7; }
.diagram-card { overflow-x: auto; }
.flow-diagram { display: flex; align-items: stretch; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.flow-node {
  flex: 1 1 150px; min-height: 64px; display: grid; place-items: center;
  padding: 10px 12px; border-radius: 12px; text-align: center;
  background: var(--teal-050); border: 1px solid var(--teal-200);
  font-size: .84rem; line-height: 1.4;
}
.flow-node.is-support { background: var(--gold-soft); border-color: #e8d9a8; }
.flow-arrow { align-self: center; color: var(--muted); }
.bar-chart { display: grid; gap: 8px; margin-bottom: 8px; }
.bar-row { display: grid; grid-template-columns: minmax(90px, 150px) 1fr minmax(90px, 130px); gap: 10px; align-items: center; font-size: .84rem; }
.bar-label { color: var(--ink-2); }
.bar-track { height: 14px; background: var(--teal-050); border-radius: 999px; overflow: hidden; }
.bar-fill { display: block; height: 100%; background: var(--teal-600); border-radius: 999px; }
.bar-value { text-align: end; white-space: nowrap; }
.term-table { display: grid; gap: 0; }
.term-row { display: grid; grid-template-columns: 180px 120px 1fr; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: .88rem; }
.term-row:last-child { border-bottom: 0; }
.misconception-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.misconception-row:last-child { border-bottom: 0; }
.misconception-row p { margin: 0; font-size: .9rem; line-height: 1.6; }
.discussion-list { margin: 0; padding-inline-start: 20px; display: grid; gap: 8px; line-height: 1.6; }
.quiz-card { margin-bottom: var(--space-4); }
.quiz-card legend { font-weight: 600; padding-inline: 4px; }
.quiz-option {
  display: flex; gap: 10px; align-items: flex-start; padding: 10px 12px;
  border: 1px solid var(--line); border-radius: 10px; margin-top: 8px;
  cursor: pointer; font-size: .9rem; line-height: 1.5;
}
.quiz-option:hover { border-color: var(--teal-600); }
.quiz-option.is-selected { border-color: var(--teal-600); background: var(--teal-050); }
.quiz-option input { margin-top: 3px; accent-color: var(--teal-600); }
.quiz-feedback { margin-top: 10px; padding: 10px 12px; border-radius: 10px; font-size: .88rem; line-height: 1.55; }
.quiz-feedback.is-correct { background: var(--teal-050); border: 1px solid var(--teal-200); }
.quiz-feedback.is-wrong { background: #fdf3e6; border: 1px solid #eed3ae; }
.quiz-feedback p { margin: 4px 0 0; }
.quiz-option-notes { margin: 8px 0 0; padding-inline-start: 18px; display: grid; gap: 3px; font-size: .82rem; color: var(--ink-2); }
.coverage-table { width: 100%; border-collapse: collapse; font-size: .84rem; }
.coverage-table th, .coverage-table td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: start; vertical-align: top; }
.coverage-table th { background: var(--teal-050); font-weight: 650; }
.coverage-table .is-ok { color: var(--teal-700); font-weight: 600; }
.coverage-table .is-plan { color: #8a5a1a; }
.section-meta { display: flex; gap: 10px; flex-wrap: wrap; margin: 12px 0 20px; }

/* ---------- 课件（Module 5） ---------- */
.slide-back { margin-bottom: 10px; }
.deck-shell { max-width: 1180px; margin-inline: auto; }
.deck-toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 12px; }
.deck-toolbar .deck-no-pptx { margin-inline-start: auto; }
.deck-stage {
  position: relative; background: var(--green-900); border-radius: var(--radius-xl);
  padding: 12px; box-shadow: var(--shadow-md);
}
.slide {
  position: relative; display: flex; flex-direction: column;
  aspect-ratio: 16 / 9; width: 100%; overflow: hidden;
  background: #fff; border-radius: 14px; color: var(--ink);
}
.slide-inner {
  display: flex; flex-direction: column; height: 100%;
  padding: clamp(22px, 3.8vw, 52px);
}
.slide-kicker {
  margin: 0 0 8px; font-size: clamp(.72rem, 1vw, .9rem);
  letter-spacing: .12em; text-transform: uppercase; font-weight: 700; color: var(--teal-700);
}
.slide h2 {
  margin: 0 0 clamp(10px, 1.6vw, 22px);
  font-size: clamp(1.35rem, 2.9vw, 2.45rem); line-height: 1.18; letter-spacing: -.015em;
}
.slide-subtitle { margin: 10px 0 0; font-size: clamp(1rem, 1.8vw, 1.45rem); color: var(--muted); }
.slide-list { margin: 0; padding-inline-start: 1.25em; display: grid; gap: clamp(8px, 1.2vw, 16px); }
.slide-list li { font-size: clamp(.92rem, 1.55vw, 1.28rem); line-height: 1.5; }
.slide-lead { margin: 0 0 10px; font-weight: 600; color: var(--teal-700); font-size: clamp(.95rem, 1.5vw, 1.2rem); }
.slide-compare { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(14px, 2vw, 28px); }
.slide-compare h3 { margin: 0 0 10px; font-size: clamp(1rem, 1.5vw, 1.25rem); color: var(--teal-700); }
.slide-compare ul { margin: 0; padding-inline-start: 1.15em; display: grid; gap: 8px; }
.slide-compare li { font-size: clamp(.85rem, 1.35vw, 1.1rem); line-height: 1.45; }
.slide-flow { margin-top: 8px; }
.slide-flow .flow-node { font-size: clamp(.78rem, 1.2vw, 1rem); min-height: clamp(54px, 8vw, 86px); }
.slide-bars .bar-row { grid-template-columns: minmax(96px, 160px) 1fr minmax(100px, 150px); font-size: clamp(.75rem, 1.05vw, .95rem); }
.slide-source { margin: 10px 0 0; color: var(--muted); font-size: clamp(.68rem, .95vw, .82rem); }
.slide-footer {
  margin-top: auto; padding-top: 10px; display: flex; justify-content: space-between;
  gap: 12px; color: var(--muted); font-size: clamp(.66rem, .9vw, .8rem);
  border-top: 1px solid var(--line);
}
.slide-page, .deck-progress { direction: ltr; unicode-bidi: isolate; }
.slide-notes {
  position: absolute; inset-inline: 0; bottom: 0; z-index: 4;
  max-height: 36%; overflow: auto; padding: 12px 18px;
  background: rgba(250, 247, 240, .97); border-top: 1px solid var(--line);
  font-size: .82rem; line-height: 1.5; display: none;
}
.slide-notes strong { display: block; margin-bottom: 4px; color: var(--teal-700); }
.slide-notes p { margin: 0; }
.deck-shell.show-notes .slide:not([hidden]) .slide-notes { display: block; }
.deck-controls { display: flex; align-items: center; justify-content: center; gap: 14px; margin-top: 14px; }
.deck-progress { font-size: .84rem; color: var(--muted); }
.deck-thumbs {
  display: grid; gap: 8px; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  margin-top: 14px;
}
.deck-thumb {
  text-align: start; border: 1px solid var(--line); background: var(--paper);
  border-radius: 10px; padding: 8px 10px; cursor: pointer; font: inherit;
  color: var(--ink-2);
}
.deck-thumb.is-active { border-color: var(--teal-600); background: var(--teal-050); }
.deck-thumb-num { display: block; font-size: .7rem; color: var(--muted); }
.deck-thumb-title { display: block; font-size: .8rem; line-height: 1.35; }
.reading-view { display: grid; gap: var(--space-4); max-width: 860px; margin-inline: auto; }
.reading-slide h2 { margin: 4px 0 10px; font-size: 1.2rem; }
.reading-slide ul { margin: 0; padding-inline-start: 18px; display: grid; gap: 6px; }
.reading-slide .slide-compare { margin-top: 8px; }
@media (max-width: 760px) {
  .slide-inner { padding: 18px; }
  .slide-compare { grid-template-columns: 1fr; gap: 10px; }
  .slide h2 { font-size: 1.25rem; }
  .slide-list li { font-size: .9rem; }
  .deck-stage { padding: 6px; border-radius: 14px; }
  .term-row { grid-template-columns: 1fr; gap: 2px; }
  .misconception-row { grid-template-columns: 1fr; gap: 8px; }
  .bar-row { grid-template-columns: minmax(76px, 110px) 1fr minmax(76px, 100px); }
}
body.presenting .topbar,
body.presenting .bottom-nav,
body.presenting .footer,
body.presenting .slide-hero,
body.presenting .slide-back,
body.presenting .deck-toolbar { display: none !important; }
body.presenting .main { padding: 0; width: 100%; max-width: none; }
body.presenting .deck-shell { max-width: none; }
body.presenting .deck-stage {
  border-radius: 0; padding: 0; height: 100vh; display: flex; align-items: center;
  background: #000;
}
body.presenting .slide { border-radius: 0; max-height: 100vh; }
body.presenting .deck-controls { position: fixed; bottom: 12px; inset-inline: 0; z-index: 20; }
@media print {
  @page { size: landscape; margin: 8mm; }
  body { background: #fff; }
  .topbar, .bottom-nav, .footer, .deck-toolbar, .deck-controls,
  .deck-thumbs, .slide-back, .slide-hero, .reading-view { display: none !important; }
  .deck-stage { background: #fff; padding: 0; box-shadow: none; }
  .slide {
    display: flex !important; width: 100%; aspect-ratio: auto;
    page-break-after: always; break-after: page; border: 0; border-radius: 0;
  }
  .slide[hidden] { display: flex !important; }
  .slide-inner { min-height: 170mm; }
  .slide-notes { display: none !important; }
}

.media {
  position: relative; background: var(--teal-050); overflow: hidden;
  display: grid; place-items: center; color: var(--teal-700);
}
.media img {
  position: absolute; inset: 0;
  width: 100%; height: 100%; object-fit: cover;
}
.media-placeholder {
  width: 100%; height: 100%; min-height: 168px;
  display: grid; place-items: center;
  font-size: 1.5rem; font-weight: 700; letter-spacing: .16em;
  color: rgba(18, 128, 107, .42);
  background: linear-gradient(135deg, var(--teal-050), #dceee6);
}
.media.is-fallback::after {
  content: attr(data-fallback); font-size: .8rem; color: var(--muted);
  padding: 12px; text-align: center;
}
.media.is-fallback img { display: none; }

.cmp-label {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .8rem; color: var(--muted); cursor: pointer;
}
.cmp-label input { accent-color: var(--teal-600); width: 16px; height: 16px; }
.btn:disabled { opacity: .45; cursor: not-allowed; }

.flag {
  display: inline-grid; place-items: center; width: 26px; height: 18px;
  border-radius: 3px; background: var(--teal-050); color: var(--teal-700);
  font-size: .62rem; font-weight: 700; letter-spacing: .02em;
  border: 1px solid var(--line); overflow: hidden; flex: 0 0 auto;
}
.flag img { width: 100%; height: 100%; object-fit: cover; border-radius: 2px; }
.flag-lg { width: 44px; height: 31px; border-radius: 4px; vertical-align: middle; }

/* 徽标 */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: .72rem; font-weight: 600; letter-spacing: .02em;
  padding: 3px 9px; border-radius: 999px;
}
.badge-verified { background: var(--teal-050); color: var(--teal-700); border: 1px solid var(--teal-200); }
.badge-pending { background: #f6f1e2; color: #7a5f14; border: 1px solid #e8d9a8; }
.badge-draft { background: #f7efef; color: #8a4a4a; border: 1px solid #e8cfcf; }
.badge-sample { background: #f4f0fa; color: #5b3f8a; border: 1px solid #ddd0f0; }

/* 列表 */
.list { display: grid; gap: 2px; }
.list-row {
  display: flex; align-items: center; gap: var(--space-4);
  padding: 14px 4px; border-bottom: 1px solid var(--line);
}
.list-row:last-child { border-bottom: 0; }
.list-row .grow { flex: 1; min-width: 0; }
.list-row h3, .list-row h4 { margin: 0; font-size: .98rem; }
.list-row .sub { color: var(--muted); font-size: .83rem; }
.num {
  font-variant-numeric: tabular-nums; color: var(--muted);
  font-size: .82rem; min-width: 42px;
}

/* 可展开 */
details.acc {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius-md); margin-bottom: 10px; overflow: hidden;
}
details.acc > summary {
  list-style: none; cursor: pointer; padding: 15px 18px;
  display: flex; align-items: center; gap: 12px; font-weight: 600;
}
details.acc > summary::-webkit-details-marker { display: none; }
details.acc > summary::after {
  content: ""; margin-inline-start: auto; width: 9px; height: 9px;
  border-inline-end: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(45deg); transition: transform .18s;
}
details.acc[open] > summary::after { transform: rotate(225deg); }
.acc-body { padding: 0 18px 16px; }
.acc-body .list-row { padding-block: 9px; }

/* 正文 */
.prose { max-width: 66ch; }
.prose h2 { font-size: 1.25rem; margin: 2em 0 .6em; }
.prose h3 { font-size: 1.05rem; margin: 1.6em 0 .5em; }
.prose p { margin: 0 0 1.05em; color: var(--ink-2); }
.prose ul { padding-inline-start: 1.2em; color: var(--ink-2); }
.prose li { margin-bottom: .4em; }

.meta-row { display: flex; flex-wrap: wrap; gap: 10px 18px; color: var(--muted); font-size: .86rem; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 8px 18px; font-size: .92rem; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: 999px; border: 1px solid transparent;
  font: inherit; font-size: .9rem; font-weight: 600; cursor: pointer;
  background: var(--green-900); color: #fff; min-height: 42px;
}
.btn:hover { background: var(--green-800); text-decoration: none; }
.btn-ghost { background: transparent; color: var(--teal-700); border-color: var(--line-strong); }
.btn-ghost:hover { background: var(--teal-050); }
.btn-gold { background: var(--gold); color: var(--green-950); }
.btn-gold:hover { background: #d7b25c; }
.btn-sm { min-height: 34px; padding: 6px 13px; font-size: .82rem; }

/* 空 / 错误 / 加载 */
.state {
  border: 1px dashed var(--line-strong); border-radius: var(--radius-lg);
  padding: var(--space-6); text-align: center; color: var(--muted); background: rgba(255,255,255,.5);
}
.state strong { display: block; color: var(--ink); margin-bottom: 6px; font-size: 1rem; }
.state .btn { margin-top: var(--space-4); }

/* 比较 */
.compare-bar {
  position: sticky; bottom: calc(var(--nav-h) + 18px + env(safe-area-inset-bottom));
  z-index: 40; margin-top: var(--space-5);
  background: var(--green-900); color: #fff; border-radius: 999px;
  padding: 8px 10px 8px 18px; display: none; align-items: center; gap: 12px;
  box-shadow: var(--shadow-nav);
}
.compare-bar.is-visible { display: flex; }
.compare-bar .count { font-size: .86rem; }
.compare-bar .btn { margin-inline-start: auto; }

table.cmp { width: 100%; border-collapse: collapse; font-size: .92rem; background: var(--paper); }
table.cmp th, table.cmp td { text-align: start; padding: 13px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.cmp th { color: var(--muted); font-weight: 600; width: 180px; }
.table-scroll { overflow-x: auto; border-radius: var(--radius-lg); border: 1px solid var(--line); }

/* 问答 */
.ask-form { display: flex; gap: 10px; flex-wrap: wrap; }
.ask-form input[type="search"] {
  flex: 1 1 320px; padding: 14px 18px; border-radius: 999px;
  border: 1px solid var(--line-strong); background: var(--paper); font: inherit;
}
.ask-form .btn { padding-inline: 26px; }
.answer {
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: var(--space-5); margin-top: var(--space-4);
  border-inline-start: 4px solid var(--teal-600);
}
.answer h3 { margin: 0 0 8px; font-size: 1rem; }
.answer .src { font-size: .78rem; color: var(--muted); margin-top: 10px; }
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .74rem; padding: 4px 10px; border-radius: 999px;
  background: var(--teal-050); color: var(--teal-700); border: 1px solid var(--teal-200);
}

/* 课件 */
.deck { display: grid; gap: var(--space-4); }
.slide {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}
.slide[hidden] { display: none; }
.slide .kicker { font-size: .76rem; letter-spacing: .14em; text-transform: uppercase; color: var(--teal-600); }
.slide h2 { margin: 10px 0 14px; font-size: clamp(1.4rem, 3vw, 2rem); line-height: 1.2; }
.slide p { margin: 0; color: var(--ink-2); font-size: clamp(1rem, 1.6vw, 1.16rem); max-width: 56ch; }
.deck-controls { display: flex; align-items: center; gap: 12px; }
.deck-progress { color: var(--muted); font-size: .86rem; }

/* 术语 */
.term-item { display: block; }
.term-item:hover { text-decoration: none; }
.term-en { font-weight: 650; }
.term-zh { color: var(--muted); font-size: .86rem; margin-inline-start: 8px; }

/* 底部导航 */
.bottom-nav {
  position: fixed; inset-inline: 0; bottom: 0; z-index: 90;
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  background: linear-gradient(to top, var(--cream) 55%, rgba(250,247,240,0));
  pointer-events: none;
}
.bottom-nav-inner {
  pointer-events: auto;
  max-width: 560px; margin-inline: auto;
  background: rgba(255, 255, 255, .97);
  border-radius: 22px; box-shadow: var(--shadow-nav);
  display: grid; grid-template-columns: repeat(5, 1fr);
  padding: 6px;
  border: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.nav-item {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  padding: 8px 2px 6px; border-radius: 16px; color: var(--muted);
  font-size: .68rem; text-align: center; line-height: 1.15; min-height: 48px;
  min-width: 0;
}
.nav-item:hover { color: var(--green-900); text-decoration: none; background: var(--teal-050); }
.nav-item.is-active { color: var(--green-900); background: var(--teal-050); font-weight: 650; }
.nav-icon svg { width: 21px; height: 21px; display: block; }
.nav-label {
  max-width: 100%; overflow: hidden;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow-wrap: anywhere;
}
html[dir="rtl"] .nav-item { font-size: .6rem; min-height: 54px; padding-block: 6px 8px; }
html[dir="rtl"] .nav-label { line-height: 1.1; }

/* 中国货源：展会 / 市场 / 平台 */
.fair-card {
  display: grid; grid-template-columns: 1.05fr 1fr;
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-md);
  margin-bottom: var(--space-6);
}
.fair-media { position: relative; min-height: 340px; background: var(--teal-050); }
.fair-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.fair-body { padding: clamp(20px, 3vw, 34px); }
.fair-body h2 { margin: 0 0 10px; font-size: clamp(1.3rem, 2vw, 1.65rem); }
.place-card { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.place-media { position: relative; aspect-ratio: 16 / 9; background: var(--teal-050); }
.place-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.place-body { padding: 18px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.place-body h3 { margin: 0; font-size: 1.08rem; }
.kv.compact { grid-template-columns: auto 1fr; gap: 4px 12px; font-size: .84rem; }
.kv.compact dt { color: var(--muted); white-space: nowrap; }
.platform-card { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.platform-media {
  position: relative; aspect-ratio: 4 / 3; background: #fff;
  display: grid; place-items: center; border-bottom: 1px solid var(--line);
}
.platform-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.platform-media.is-logo img { object-fit: contain; padding: 22px; background: #fff; }
.platform-media.is-empty::after {
  content: attr(data-fallback); color: var(--muted); font-size: .8rem;
}
/* 无标识图时：品牌色整块铺满图片区，中英名称居中 */
.platform-media.has-tile { background: var(--brand, var(--teal-600)); }
.brand-tile {
  position: absolute; inset: 0; overflow: hidden;
  padding: 18px;
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--brand, var(--teal-600)) 88%, #fff) 0%,
    var(--brand, var(--teal-600)) 58%,
    color-mix(in srgb, var(--brand, var(--teal-600)) 78%, #000) 100%);
  color: #fff;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 6px; text-align: center;
}
.brand-tile::before {
  content: attr(data-initial);
  position: absolute; inset-inline-end: -4%; bottom: -18%;
  font-size: 9rem; font-weight: 800; line-height: 1;
  color: rgba(255, 255, 255, .13); letter-spacing: -.04em;
  pointer-events: none;
}
.brand-tile strong {
  position: relative;
  font-size: clamp(1.15rem, 2.4vw, 1.65rem); font-weight: 700;
  line-height: 1.2; letter-spacing: .01em;
  text-shadow: 0 1px 2px rgba(0, 0, 0, .18);
}
.brand-tile small {
  position: relative;
  font-size: .76rem; letter-spacing: .16em; text-transform: uppercase;
  color: rgba(255, 255, 255, .82);
}
.platform-body { padding: 16px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.platform-body h3 { margin: 0; font-size: 1.03rem; }
.product-card { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.product-media { position: relative; aspect-ratio: 16 / 10; background: var(--teal-050); }
.product-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.product-body { padding: 16px; display: flex; flex-direction: column; gap: 4px; flex: 1; }
.product-body h3 { margin: 0; font-size: 1.05rem; }
/* 教学总结：与带来源的事实性内容区分 */
.teach-note {
  margin-top: auto; padding: 10px 12px;
  border-inline-start: 3px solid var(--gold, #c9a227);
  border-start-start-radius: 0; border-start-end-radius: 10px;
  border-end-end-radius: 10px; border-end-start-radius: 0;
  background: color-mix(in srgb, var(--gold, #c9a227) 10%, #fff);
}
.teach-note .teach-label {
  display: inline-block; margin-bottom: 4px;
  font-size: .7rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: #8a6d12;
}
.teach-note p { margin: 0; font-size: .86rem; line-height: 1.55; color: var(--ink-2); }

@media (max-width: 860px) {
  .fair-card { grid-template-columns: 1fr; }
  .fair-media { min-height: 220px; }
}

/* 页脚 */
.footer { padding-block: var(--space-5) calc(var(--space-6) + 72px); color: var(--muted); font-size: .84rem; }
.footer p { margin: 0 0 6px; }
.dev-note { color: #8a5a1a; }
.small { font-size: .78rem; }
.muted { color: var(--muted); }

/* 响应式 */
@media (max-width: 960px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero-inner { grid-template-columns: 1fr; gap: var(--space-5); }
  .hero-side { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  body { font-size: 15.5px; }
  .wrap { width: min(1120px, 100% - 28px); }
  .topbar-inner { flex-wrap: wrap; gap: 10px; padding-block: 10px; }
  .brand-text { font-size: .92rem; }
  .search { order: 3; flex-basis: 100%; max-width: none; }
  .menu-label { display: none; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .hero { padding-block: var(--space-6) var(--space-7); }
  .main { padding-block: var(--space-6); }
  .card { padding: var(--space-4); }
  .my-country-inner { width: min(1120px, 100% - 28px); }
  .list-row { gap: 10px; }
  table.cmp th { width: 120px; }
}

@media (max-width: 420px) {
  .nav-item { font-size: .62rem; }
  .compare-bar { inset-inline: 14px; }
  .hero-side { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .hero-stat { padding: 10px 12px; }
  .hero-stat strong { font-size: 1.2rem; }
}

/* 投影可读性：讲义式列表与图表标签放大（v2） */
.slide-list li { font-size: clamp(1.15rem, 2.15vw, 2rem); line-height: 1.42; }
.slide h2 { font-size: clamp(1.5rem, 3.1vw, 2.35rem); }
.slide-timeline p { font-size: clamp(.95rem, 1.3vw, 1.1rem); }
.slide-timeline strong { font-size: clamp(1rem, 1.6vw, 1.25rem); }
.slide-compare ul li { font-size: clamp(1rem, 1.45vw, 1.22rem); line-height: 1.45; }
.hub-nodes span { font-size: clamp(.9rem, 1.2vw, 1rem); }
.slide-activity li { font-size: clamp(1rem, 1.4vw, 1.15rem); }
.slide-card p { font-size: clamp(1rem, 1.45vw, 1.22rem); }
.slide-card h3 { font-size: clamp(1.05rem, 1.55vw, 1.3rem); }
.slide-flow-chain li { font-size: clamp(.95rem, 1.4vw, 1.15rem); }
.slide-bars .bar-label, .slide-bars .bar-value { font-size: clamp(1rem, 1.7vw, 1.55rem); }
.slide-bars .bar-row { min-height: 40px; }


.slide-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.slide-meta { display: flex; gap: 6px; margin: 0; }
.slide-meta span {
  font-size: .7rem; letter-spacing: .04em; padding: 3px 9px;
  border-radius: 999px; background: color-mix(in srgb, var(--teal-600) 12%, #fff);
  color: var(--teal-600); white-space: nowrap;
}
.reveal-item { opacity: 0; transform: translateY(10px); transition: opacity .32s ease, transform .32s ease; }
.reveal-item.is-visible { opacity: 1; transform: none; }

.slide-timeline {
  position: relative; display: grid; gap: 18px; list-style: none;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  padding: 0; margin: 18px 0 0;
}
.slide-timeline::before {
  content: ""; position: absolute; inset-inline: 0; top: 26px; height: 3px;
  background: color-mix(in srgb, var(--teal-600) 35%, #fff); border-radius: 3px;
}
.slide-timeline li { position: relative; padding-top: 48px; }
.tl-label {
  position: absolute; top: 12px; inset-inline-start: 0;
  padding: 2px 9px; border-radius: 999px; font-size: .74rem; font-weight: 700;
  background: var(--green-900); color: #fff;
}
.slide-timeline strong { display: block; font-size: clamp(.95rem, 1.5vw, 1.15rem); margin-bottom: 4px; }
.slide-timeline p { margin: 0; font-size: clamp(.8rem, 1.15vw, .95rem); color: var(--ink-2); }

.slide-cards { display: grid; gap: 14px; margin-top: 16px; }
.slide-cards.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.slide-cards.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.slide-cards.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.slide-card {
  background: #fff; border: 1px solid color-mix(in srgb, var(--green-900) 12%, #fff);
  border-radius: 14px; padding: 14px 16px;
  box-shadow: 0 8px 20px rgba(11, 58, 44, .06);
}
.slide-card-label {
  margin: 0 0 4px; font-size: .7rem; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--teal-600);
}
.slide-card h3 { margin: 0 0 6px; font-size: clamp(.95rem, 1.4vw, 1.1rem); }
.slide-card p { margin: 0; font-size: clamp(.8rem, 1.1vw, .93rem); color: var(--ink-2); }

.slide-hub { display: grid; grid-template-columns: minmax(180px, 230px) 1fr; gap: 22px; align-items: center; margin-top: 16px; }
.hub-center {
  aspect-ratio: 1; border-radius: 50%; display: grid; place-items: center; padding: 20px;
  text-align: center; font-weight: 700; color: #fff; font-size: clamp(.9rem, 1.4vw, 1.1rem);
  background: radial-gradient(circle at 30% 30%, var(--teal-600), var(--green-900));
}
.hub-nodes { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.hub-nodes li { padding: 10px 12px; border-radius: 12px; background: #fff; border: 1px solid color-mix(in srgb, var(--green-900) 12%, #fff); }
.hub-nodes strong { display: block; font-size: .9rem; }
.hub-nodes span { display: block; margin-top: 2px; font-size: .78rem; color: var(--muted); }

.slide-flow-chain { list-style: none; margin: 18px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.slide-flow-chain li {
  flex: 1 1 150px; display: flex; align-items: flex-start; gap: 8px;
  padding: 10px 12px; border-radius: 12px;
  background: color-mix(in srgb, var(--teal-600) 8%, #fff);
  border: 1px solid color-mix(in srgb, var(--teal-600) 22%, #fff);
  font-size: clamp(.78rem, 1.1vw, .92rem);
}
.flow-num {
  flex: 0 0 auto; width: 22px; height: 22px; border-radius: 50%;
  display: grid; place-items: center; font-size: .72rem; font-weight: 700;
  background: var(--green-900); color: #fff;
}
.slide-activity { margin: 16px 0 0; padding-inline-start: 20px; }
.slide-activity li { margin-bottom: 10px; line-height: 1.55; font-size: clamp(.82rem, 1.15vw, .96rem); }
.slide-quote {
  margin: 18px 0; padding: 10px 0 10px 18px;
  border-inline-start: 4px solid var(--gold, #c8a24a);
  font-size: clamp(1.15rem, 2.4vw, 1.75rem); line-height: 1.4; font-weight: 600;
}

@media (max-width: 860px) {
  .slide-hub { grid-template-columns: 1fr; }
  .hub-center { max-width: 180px; margin-inline: auto; }
  .slide-cards.cols-3, .slide-cards.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 620px) {
  .slide-cards.cols-2, .slide-cards.cols-3, .slide-cards.cols-4 { grid-template-columns: 1fr; }
  .slide-timeline::before { display: none; }
  .slide-timeline li { padding-top: 34px; }
}
@media print {
  .reveal-item { opacity: 1 !important; transform: none !important; }
}
@media (prefers-reduced-motion: reduce) {
  .reveal-item { opacity: 1; transform: none; }
}

/* 课程素材：学生端卡片与教师工作区 */
.material-group {
  margin: 18px 0 8px; font-size: .78rem; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--teal-600);
}
.material-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.material-card { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.material-media { aspect-ratio: 16 / 9; background: var(--teal-050); }
.material-media img, .material-media video { width: 100%; height: 100%; object-fit: cover; display: block; }
.material-body { padding: 14px 16px; display: flex; flex-direction: column; gap: 6px; }
.material-body h3 { margin: 0; }
.material-body p { margin: 0; }
.material-body .btn { align-self: flex-start; margin-top: 4px; }
.material-form { display: flex; flex-direction: column; gap: 14px; }
.material-form label { display: flex; flex-direction: column; gap: 6px; font-size: .84rem; font-weight: 600; }
.material-form input:not([type="checkbox"]):not([type="radio"]),
.material-form select, .material-form textarea {
  padding: 10px 12px; border: 1px solid color-mix(in srgb, var(--green-900) 18%, #fff);
  border-radius: 10px; font: inherit; color: var(--ink); background: #fff;
}
.material-form .checkline { flex-direction: row; align-items: center; gap: 8px; font-weight: 500; }
.material-replace { border: 1px dashed color-mix(in srgb, var(--green-900) 25%, #fff); border-radius: 12px; padding: 10px 14px; }
.material-replace legend { padding-inline: 6px; font-size: .8rem; font-weight: 700; }
.material-replace label { flex-direction: row; align-items: center; gap: 8px; margin-top: 6px; }
.version-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 6px 0; border-top: 1px dashed color-mix(in srgb, var(--green-900) 14%, #fff); }
.version-row span { font-size: .82rem; color: var(--muted); }

/* 素材绑定：教师端选择器与学生端内嵌 */
.material-bind .slide-pick {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px 14px;
  margin-top: 8px; max-height: 240px; overflow: auto;
}
.slide-pick-row {
  flex-direction: row !important; align-items: baseline !important;
  gap: 8px; font-weight: 500 !important; padding: 3px 0;
}
.slide-pick-row input { flex: none; }
.inline-materials {
  margin-top: 12px; border-inline-start: 3px solid var(--teal-500);
  background: color-mix(in srgb, var(--teal-050) 55%, #fff);
}
.inline-material-list { list-style: none; margin: 6px 0 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.inline-material-list li { display: flex; flex-direction: column; gap: 2px; }
.inline-material-list li p { margin: 0; }
.slide-materials { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 6px; margin-top: 4px; }
.slide-materials-label {
  font-size: clamp(.66rem, .92vw, .82rem); letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted);
}
.slide-material-chip { font-size: clamp(.66rem, .96vw, .86rem); padding: 2px 8px; line-height: 1.25; }

@media (max-width: 760px) {
  .material-grid { grid-template-columns: 1fr; }
}

/* 课件 v2 字号覆盖（放在文件末尾，确保覆盖基础版式） */
.slide-card p { font-size: clamp(1.05rem, 1.9vw, 1.75rem); }
.slide-card h3 { font-size: clamp(1.1rem, 2vw, 1.85rem); }
.slide-compare ul li { font-size: clamp(1.05rem, 1.9vw, 1.75rem); line-height: 1.42; }
.hub-nodes span { font-size: clamp(1rem, 1.45vw, 1.2rem); }
.slide-activity li { font-size: clamp(1.05rem, 1.65vw, 1.4rem); }


.course-info .concept-kv { margin: 0; }
.chart-reading { margin-top: 10px; border-inline-start: 3px solid var(--teal-600); }
.teacher-note {
  margin-top: 14px; padding: 12px 14px;
  border-inline-start: 3px solid var(--gold, #c9a227);
  border-start-start-radius: 0; border-start-end-radius: 10px;
  border-end-end-radius: 10px; border-end-start-radius: 0;
  background: color-mix(in srgb, var(--gold, #c9a227) 9%, #fff);
}
.teacher-note p { margin: 0; }
.teacher-note p + p { margin-top: 6px; }
.activity-steps { margin: 10px 0; padding-inline-start: 20px; }
.activity-steps li { margin-bottom: 8px; line-height: 1.6; }
.activity-time {
  display: inline-block; min-width: 54px; margin-inline-end: 8px;
  font-size: .78rem; font-weight: 700; letter-spacing: .04em;
  color: var(--teal-600);
}
.case-study .concept-kv dt { min-width: 130px; }

@media (max-width: 760px) {
  .case-study .concept-kv dt { min-width: 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* 语言设置、阅读方式与译文状态 */
.lang-prompt { margin-bottom: 20px; border: 1px solid color-mix(in srgb, var(--teal-600) 22%, #fff); }
.lang-prompt h2 { margin: 4px 0 8px; }
.lang-form { display: flex; flex-direction: column; gap: 14px; }
.lang-form label, .lang-prompt label {
  display: flex; flex-direction: column; gap: 6px;
  font-size: .84rem; font-weight: 600;
}
.lang-form select, .lang-prompt select {
  padding: 10px 12px; border: 1px solid color-mix(in srgb, var(--green-900) 18%, #fff);
  border-radius: 10px; font: inherit; color: var(--ink); background: #fff;
  width: 100%; max-width: 100%; min-width: 0;
}
.lang-prompt, .lang-prompt .grid > label { min-width: 0; }
.menu-note { font-size: .68rem; color: var(--muted); margin-inline-start: 4px; }
.menu-settings { font-weight: 650; border-top: 1px solid color-mix(in srgb, var(--green-900) 12%, #fff); }

.reading-controls {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 14px; flex-wrap: wrap; margin: 18px 0;
}
.reading-mode-links { display: flex; flex-wrap: wrap; gap: 8px; }
.reading-meta { align-self: flex-end; }
.translation-notice { border-inline-start: 4px solid var(--gold, #c9a227); }
.compare-block { margin-bottom: 14px; }
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.compare-label {
  margin: 0 0 4px; font-size: .7rem; font-weight: 700; letter-spacing: .09em;
  text-transform: uppercase; color: var(--teal-600);
}
.compare-text { margin: 0; line-height: 1.65; }
.explain-panel { margin-top: 14px; border-inline-start: 3px solid var(--teal-500); }
.explain-panel summary { cursor: pointer; font-weight: 700; color: var(--teal-700); }
.explain-panel[open] summary { margin-bottom: 12px; }
.term-en {
  display: inline-block; padding: 1px 6px; border-radius: 999px;
  font-size: .62rem; letter-spacing: .06em; vertical-align: middle;
  background: var(--teal-050); color: var(--teal-700);
}

/* 阿拉伯语：字体、混排与方向 */
[dir="rtl"] {
  font-family: "Segoe UI", "Noto Naskh Arabic", "Amiri", "Geeza Pro", Tahoma, sans-serif;
}
[dir="rtl"] .prose p,
[dir="rtl"] .slide li,
[dir="rtl"] .compare-text,
[dir="rtl"] .concept-kv dd,
[dir="rtl"] .term-row span,
[dir="rtl"] .chat-bubble {
  unicode-bidi: plaintext;
}
[dir="rtl"] .num,
[dir="rtl"] code,
[dir="rtl"] .ltr,
[dir="rtl"] .slide-footer,
[dir="rtl"] .menu-code,
[dir="rtl"] .lang-code,
[dir="rtl"] .term-row strong {
  direction: ltr;
  unicode-bidi: isolate;
  display: inline-block;
}
[dir="rtl"] .flow-arrow { transform: scaleX(-1); }

@media (max-width: 760px) {
  .compare-grid { grid-template-columns: 1fr; }
  .reading-controls { flex-direction: column; align-items: stretch; }
  .reading-meta { align-self: flex-start; }
}

/* 手机端课件：取消固定 16:9，改为纵向可读，避免裁切 */
@media (max-width: 620px) {
  .slide { aspect-ratio: auto; }
  .slide-inner { height: auto; padding: 18px 16px 20px; }
  .slide h2 { font-size: 1.25rem; }
  .slide-list li, .slide-card p, .slide-compare ul li,
  .slide-timeline p, .slide-activity li { font-size: .92rem; }
  .slide-cards.cols-2, .slide-cards.cols-3, .slide-cards.cols-4 { grid-template-columns: 1fr; }
  .slide-hub { grid-template-columns: 1fr; }
  .slide-timeline::before { display: none; }
  .slide-timeline li { padding-top: 8px; }
  .slide-compare { grid-template-columns: 1fr; }
}

/* ---------------------------------------------------------------- 模块 7：多轮问答 */
.chat-shell [hidden] { display: none !important; }

.chat-connect-note { margin-bottom: 16px; }
.chat-connect-note p { margin: 6px 0 0; font-size: .88rem; }

.chat-shell {
  display: grid;
  grid-template-columns: 264px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.chat-side {
  position: sticky;
  top: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 14px;
  border: 1px solid color-mix(in srgb, var(--green-900) 10%, #fff);
  border-radius: 16px;
  background: #fff;
  max-height: calc(100vh - 120px);
  overflow: auto;
}
.chat-new { width: 100%; }
.chat-side-title {
  margin: 6px 0 0;
  font-size: .74rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}
.chat-session-list { display: flex; flex-direction: column; gap: 4px; }
.chat-session {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
  color: inherit;
  text-decoration: none;
}
.chat-session:hover { background: color-mix(in srgb, var(--teal-600) 7%, #fff); }
.chat-session.is-active {
  background: color-mix(in srgb, var(--teal-600) 10%, #fff);
  border-color: color-mix(in srgb, var(--teal-600) 24%, #fff);
}
.chat-session-title {
  font-size: .86rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.chat-session-time { font-size: .7rem; color: var(--muted); }
.chat-privacy { margin-top: 8px; font-size: .82rem; }
.chat-privacy summary { cursor: pointer; font-weight: 600; }
.chat-kb-line { margin: 4px 0 0; }

.chat-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border: 1px solid color-mix(in srgb, var(--green-900) 10%, #fff);
  border-radius: 16px;
  background: #fff;
  overflow: hidden;
}
.chat-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid color-mix(in srgb, var(--green-900) 8%, #fff);
  background: #fff;
}
.chat-title {
  margin: 0;
  font-size: 1rem;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.chat-head-actions { display: flex; gap: 6px; }
.chat-side-toggle { display: none; }

.chat-log {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px 16px 8px;
  min-height: 320px;
  max-height: min(62vh, 720px);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.chat-empty { margin: 24px auto; max-width: 620px; text-align: center; }
.chat-empty h3 { margin: 0 0 6px; }
.chat-empty p { color: var(--muted); margin: 0 0 14px; }
.chat-examples { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }

.chat-msg { display: flex; flex-direction: column; gap: 6px; max-width: 92%; }
.chat-msg-user { align-self: flex-end; align-items: flex-end; }
.chat-msg-assistant { align-self: flex-start; align-items: flex-start; }
.chat-msg-head { display: flex; gap: 8px; align-items: baseline; font-size: .72rem; color: var(--muted); }
.chat-who { font-weight: 650; color: var(--ink); }
.chat-bubble {
  padding: 12px 14px;
  border-radius: 14px;
  line-height: 1.65;
  font-size: .92rem;
  background: color-mix(in srgb, var(--teal-600) 8%, #fff);
  border: 1px solid color-mix(in srgb, var(--teal-600) 16%, #fff);
  overflow-wrap: anywhere;
}
.chat-msg-user .chat-bubble {
  background: var(--green-900);
  border-color: var(--green-900);
  color: #fff;
  border-start-end-radius: 4px;
}
.chat-msg-assistant .chat-bubble { border-start-start-radius: 4px; }
.chat-bubble-error {
  background: color-mix(in srgb, #c0392b 6%, #fff);
  border-color: color-mix(in srgb, #c0392b 24%, #fff);
}
.chat-typing { color: var(--muted); }
.chat-typing::after {
  content: "…";
  animation: chat-dots 1.2s steps(4, end) infinite;
}
@keyframes chat-dots {
  0% { opacity: .2; } 50% { opacity: 1; } 100% { opacity: .2; }
}
.chat-ver { font-size: .7rem; color: var(--muted); }

.chat-sources { font-size: .82rem; width: 100%; }
.chat-sources summary { cursor: pointer; color: var(--teal-700, #0f6b5c); font-weight: 600; }
.chat-sources ul { margin: 8px 0 0; padding-inline-start: 18px; display: flex; flex-direction: column; gap: 8px; }
.chat-sources blockquote {
  margin: 4px 0 0;
  padding-inline-start: 10px;
  border-inline-start: 2px solid color-mix(in srgb, var(--green-900) 16%, #fff);
  color: var(--muted);
  font-size: .78rem;
}
.chat-src-meta { display: block; font-size: .7rem; color: var(--muted); }

.chat-actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.chat-link {
  border: 0;
  background: none;
  padding: 0;
  font: inherit;
  font-size: .76rem;
  color: var(--muted);
  cursor: pointer;
  text-decoration: underline;
}
.chat-link:hover { color: var(--ink); }

.chat-followups { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.chat-followups-label { font-size: .72rem; color: var(--muted); }
.chat-followups .chip, .chat-examples .chip {
  border: 1px solid color-mix(in srgb, var(--green-900) 14%, #fff);
  background: #fff;
  padding: 5px 10px;
  border-radius: 999px;
  font-size: .78rem;
  cursor: pointer;
}
.chat-followups .chip:hover, .chat-examples .chip:hover {
  background: color-mix(in srgb, var(--teal-600) 8%, #fff);
}

.chat-feedback-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: min(420px, 100%);
  padding: 10px;
  border: 1px dashed color-mix(in srgb, var(--green-900) 20%, #fff);
  border-radius: 12px;
  background: #fff;
}
.chat-feedback-form label { display: flex; flex-direction: column; gap: 4px; font-size: .78rem; }
.chat-feedback-form input, .chat-feedback-form textarea {
  padding: 7px 9px;
  border: 1px solid color-mix(in srgb, var(--green-900) 16%, #fff);
  border-radius: 8px;
  font: inherit;
  font-size: .82rem;
}

.chat-composer {
  position: static;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px 14px 12px;
  border-top: 1px solid color-mix(in srgb, var(--green-900) 8%, #fff);
  background: #fff;
}
.chat-composer textarea {
  width: 100%;
  resize: none;
  min-height: 46px;
  max-height: 180px;
  padding: 11px 12px;
  border: 1px solid color-mix(in srgb, var(--green-900) 16%, #fff);
  border-radius: 12px;
  font: inherit;
  font-size: .92rem;
  line-height: 1.5;
  color: var(--ink);
  background: #fff;
}
.chat-composer-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: flex-end;
}
.chat-status { margin-inline-end: auto; font-size: .78rem; color: var(--muted); }

.teacher-feedback-list { display: flex; flex-direction: column; gap: 12px; }
.teacher-feedback-quote {
  margin: 8px 0;
  padding: 10px 12px;
  border-inline-start: 3px solid var(--gold, #c9a227);
  background: #fbfaf6;
  font-size: .84rem;
  white-space: pre-wrap;
}

@media (max-width: 860px) {
  .chat-shell { grid-template-columns: 1fr; }
  .chat-side {
    position: static;
    max-height: none;
    display: none;
  }
  .chat-shell.is-side-open .chat-side { display: flex; }
  .chat-side-toggle { display: inline-flex; }
  .chat-log { min-height: 260px; max-height: none; padding: 14px 12px 6px; }
  .chat-msg { max-width: 100%; }
  .chat-head { padding: 10px 12px; }
  .chat-head-actions { gap: 4px; }
}

/* ---------------------------------------------------------------- 模块 8：教师控制台与我的 */
.teach-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}
.teach-nav .chip { text-decoration: none; }
.inline-form { display: inline-flex; gap: 6px; align-items: center; }
.teach-nav + .catalog-notice { margin-bottom: 12px; }

.class-focus {
  border-inline-start: 4px solid var(--gold-500, #c8a24a);
  margin-bottom: 14px;
}
.class-focus p { margin: 4px 0; }

.table-scroll { overflow-x: auto; }


/* ---------------------------------------------------------------- 模块 9：课件可视化与课件内编辑
   设计语言：浅色内容页 + 深绿主色 + 陶土色强调；比较色仅用于第二系列。
   所有图表由服务端 slide_viz.py 输出，屏幕、打印、PDF 使用同一套几何。 */
:root {
  --viz-primary: #0f6b4f;
  --viz-accent: #c2703a;
  --viz-compare: #3d6b8e;
  --viz-ink: #17231f;
  --viz-muted: #5f7169;
  --viz-grid: #e3e8e4;
  --viz-paper: #ffffff;
  --viz-soft: #f5f8f6;
  --viz-accent-soft: #fdf5ee;
}

.deck-toolbar [hidden] { display: none !important; }

/* 内容页标题层级：标题是结论，图表占据主视觉区 */
.slide.has-viz .slide-inner { padding: clamp(18px, 2.6vw, 38px) clamp(20px, 3vw, 44px); }
.slide.has-viz .slide-kicker { font-size: clamp(.66rem, .85vw, .78rem); margin-bottom: 4px; }
.slide.has-viz h2 {
  font-size: clamp(1.12rem, 1.95vw, 1.72rem);
  line-height: 1.22; margin: 0 0 clamp(6px, 1vw, 12px); max-width: 52ch;
}
.slide.has-viz .slide-footer { padding-top: 6px; }
.slide-visual { position: relative; flex: 1; min-height: 0; display: flex; }

/* ---- 图表容器：图表占主区，结论放右侧窄栏，来源与单位压在页脚 ---- */
.viz {
  display: grid; flex: 1; min-height: 0; margin: 0;
  grid-template-columns: minmax(0, 1fr) minmax(210px, 0.33fr);
  grid-template-rows: auto minmax(0, 1fr) auto auto auto;
  grid-template-areas: "q q" "canvas insight" "canvas derived" "caveat caveat" "meta meta";
  gap: 5px 16px;
}
.viz-table, .viz-three_flows {
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr) auto auto auto auto;
  grid-template-areas: "q" "canvas" "insight" "derived" "caveat" "meta";
  gap: 5px;
}
.viz-question { grid-area: q; }
.viz-canvas { grid-area: canvas; }
.viz-insight { grid-area: insight; align-self: start; }
.viz-derived-row { grid-area: derived; align-self: start; }
.viz-caveat { grid-area: caveat; }
.viz-meta { grid-area: meta; }

.slide .viz-question {
  display: flex; align-items: baseline; gap: 8px; margin: 0; max-width: none;
  font-size: clamp(.72rem, 1vw, .86rem); line-height: 1.35; color: var(--viz-muted);
}
.viz-q-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 17px; height: 17px; border-radius: 50%; flex: none;
  background: var(--viz-primary); color: #fff; font-size: 11px; font-weight: 700;
}
.viz-canvas { min-height: 0; display: flex; align-items: stretch; direction: ltr; }
.viz-path .viz-canvas { flex-direction: column; gap: 6px; }
.viz-path .viz-canvas .viz-svg { flex: 1 1 auto; min-height: 0; }
.viz-path .viz-table-wrap { flex: 0 0 auto; max-height: 42%; overflow: auto; }
.viz-table .viz-canvas, .viz-three_flows .viz-canvas { align-items: flex-start; overflow: auto; }
.viz-table .viz-canvas .viz-table-wrap { width: 100%; }
.viz-svg { width: 100%; height: 100%; min-height: 0; display: block; direction: ltr; }
.viz-svg text { font-family: var(--font-sans); }
.viz-tick { font-variant-numeric: tabular-nums; }
.viz-value, .viz-endlabel { font-variant-numeric: tabular-nums; }
.viz-insight {
  display: flex; flex-direction: column; align-items: flex-start; gap: 4px;
  border-inline-start: 3px solid var(--viz-accent);
  background: var(--viz-accent-soft);
  padding: 8px 11px; border-radius: 0 6px 6px 0;
}
.viz-insight > span {
  flex: none; font-size: clamp(.58rem, .78vw, .68rem); font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase; color: var(--viz-accent);
}
.slide .viz-insight p {
  margin: 0; max-width: none;
  font-size: clamp(.76rem, 1.02vw, .92rem); line-height: 1.5; color: var(--viz-ink);
}
.viz-derived-row { display: flex; flex-wrap: wrap; gap: 6px; }
.viz-derived {
  display: inline-flex; align-items: baseline; gap: 6px;
  border: 1px solid var(--viz-grid); border-radius: 999px;
  padding: 2px 10px; background: #fff; direction: ltr;
  font-size: clamp(.64rem, .86vw, .76rem); color: var(--viz-muted);
}
.viz-scroll-hint { display: none; }
html { scroll-padding-top: 84px; }
.slide { scroll-margin-top: 84px; }
.viz-derived strong { color: var(--viz-primary); font-variant-numeric: tabular-nums; }
.slide .viz-caveat {
  margin: 0; max-width: none;
  font-size: clamp(.6rem, .76vw, .7rem); line-height: 1.4; color: var(--viz-muted);
}
.viz-caveat { margin: 0; font-size: .7rem; color: var(--viz-muted); }
.viz-meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px;
  font-size: clamp(.6rem, .78vw, .7rem); color: var(--viz-muted);
  border-top: 1px solid var(--viz-grid); padding-top: 5px; margin-top: auto;
}
.viz-status {
  display: inline-flex; align-items: center; gap: 4px;
  border-radius: 4px; padding: 1px 7px; font-weight: 700; letter-spacing: .02em;
  background: var(--viz-soft); color: var(--viz-primary);
}
.viz-status-estimate, .viz-status-forecast { background: #eef3f8; color: var(--viz-compare); }
.viz-status-simulated { background: #fdf1e7; color: #a8551f; }
.viz-status-concept { background: #f2f3f1; color: var(--viz-muted); }

/* ---- 表格 ---- */
.viz-table-wrap { width: 100%; overflow: auto; }
.viz-table {
  width: 100%; border-collapse: collapse; background: var(--viz-paper);
  font-size: clamp(.7rem, 1.02vw, .92rem); line-height: 1.4;
}
.viz-table caption {
  caption-side: top; text-align: start; font-size: .82rem;
  color: var(--viz-muted); padding-bottom: 6px;
}
.viz-table th, .viz-table td {
  padding: clamp(5px, .8vw, 9px) clamp(8px, 1.1vw, 14px);
  border-bottom: 1px solid var(--viz-grid); vertical-align: top;
}
.viz-table thead th {
  font-size: .95em; letter-spacing: .02em; color: var(--viz-primary);
  border-bottom: 2px solid var(--viz-primary); background: #fbfdfb;
  text-align: start;
}
.viz-table tbody th { font-weight: 600; color: var(--viz-ink); text-align: start; }
.viz-table tbody tr:nth-child(even) { background: #f8fbf9; }
.viz-table tbody tr.is-emphasis { background: #fdf3e8; }
.viz-table tbody tr.is-emphasis th { color: #8a4d22; }
.viz-table th.is-emphasis { color: var(--viz-accent); }
.viz-table-compact { margin-top: 6px; font-size: clamp(.66rem, .92vw, .82rem); }
.viz-table-compact th, .viz-table-compact td { padding: 4px 9px; }
.viz-table td, .viz-table th { font-variant-numeric: tabular-nums; }

/* ---- 讲义页、阅读模式 ---- */
.reading-slide .viz { margin-top: 10px; }
.reading-slide .viz-canvas { min-height: 260px; }
.reading-slide .viz-meta { margin-top: 8px; }

/* ---- 分步显示：默认全部可见；教师点「逐步显示」后才进入分步状态 ----
   只改变可见性，不改变图形比例与数值 ---- */
.slide.is-stepping .viz[data-reveal="steps"] .viz-flow-lane { opacity: 0; transition: opacity .28s ease; }
.slide.is-stepping .viz[data-reveal="steps"] .viz-flow-lane.is-revealed { opacity: 1; }
.slide.is-stepping .viz-table.is-step-table tbody tr { opacity: 0; transition: opacity .24s ease; }
.slide.is-stepping .viz-table.is-step-table tbody tr.is-revealed { opacity: 1; }
.viz.no-anim .viz-flow-lane,
.viz.no-anim .viz-table tbody tr { opacity: 1 !important; transition: none !important; }

@media (prefers-reduced-motion: reduce) {
  .viz-flow-lane, .viz-table tbody tr, .reveal-item { transition: none !important; }
}

/* ---- 教师端：课件内编辑 ---- */
.slide-visual.is-editable { outline: 1px dashed transparent; }
.slide-visual.is-editable:hover { outline-color: var(--teal-200, #c3e6d9); }
.viz-edit-btn {
  position: absolute; inset-block-start: 4px; inset-inline-end: 4px; z-index: 3;
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid rgba(11, 58, 44, .18); border-radius: 999px;
  background: rgba(255, 255, 255, .96); color: var(--green-900);
  font-size: .74rem; font-weight: 600; padding: 4px 10px; cursor: pointer;
  box-shadow: 0 2px 8px rgba(7, 40, 31, .1);
}
.viz-edit-btn:hover { background: var(--teal-050, #eaf5f0); }
.viz-edit-btn:focus-visible { outline: 2px solid var(--teal-600); outline-offset: 2px; }

.teach-deck-wrap { position: relative; }
.teach-deck {
  background: var(--green-900); border-radius: 18px; padding: 10px;
  max-width: 1120px; margin: 0 auto;
}
.teach-deck .slide { border-radius: 10px; }
.teach-deck-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  margin: 8px auto 0; max-width: 1120px;
}
.teach-deck-bar .muted { margin-inline-start: auto; }

.viz-drawer {
  position: fixed; z-index: 200; inset-block: 0; inset-inline-end: 0;
  width: min(560px, 96vw); background: #fff; border-inline-start: 1px solid var(--line);
  box-shadow: -18px 0 40px rgba(7, 40, 31, .18);
  display: flex; flex-direction: column; transform: translateX(104%);
  transition: transform .25s ease; visibility: hidden;
}
[dir="rtl"] .viz-drawer { transform: translateX(-104%); }
.viz-drawer.is-open { transform: translateX(0); visibility: visible; }
.viz-drawer-head {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 16px; border-bottom: 1px solid var(--line);
}
.viz-drawer-head h2 { margin: 0; font-size: 1rem; }
.viz-drawer-head .viz-close { margin-inline-start: auto; }
.viz-tabs { display: flex; gap: 4px; padding: 8px 16px 0; border-bottom: 1px solid var(--line); }
.viz-tab {
  border: 0; background: none; padding: 8px 12px; cursor: pointer;
  font-size: .86rem; color: var(--muted); border-bottom: 2px solid transparent;
}
.viz-tab.is-active { color: var(--green-900); border-bottom-color: var(--teal-600); font-weight: 700; }
.viz-drawer-body { overflow: auto; padding: 14px 16px 22px; flex: 1; }
.viz-pane[hidden] { display: none !important; }
.viz-review-flag[hidden], .viz-shared-banner[hidden], .viz-error[hidden],
.chip[hidden], .viz-edit-btn[hidden] { display: none !important; }
.viz-field { display: block; margin-bottom: 10px; font-size: .82rem; color: var(--muted); }
.viz-field > span { display: block; margin-bottom: 3px; }
.viz-field input[type="text"], .viz-field input[type="number"], .viz-field select,
.viz-field textarea {
  width: 100%; font: inherit; font-size: .88rem; color: var(--ink);
  padding: 6px 8px; border: 1px solid var(--line-strong); border-radius: 8px; background: #fff;
}
.viz-field textarea { resize: vertical; min-height: 58px; }
.viz-row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.viz-row3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.viz-hint { margin: 0 0 10px; font-size: .78rem; color: var(--muted); line-height: 1.5; }
.viz-error {
  margin: 8px 0; padding: 8px 10px; border-radius: 8px;
  background: #fdf1ec; color: #8a2f14; font-size: .8rem;
}
.viz-grid { width: 100%; border-collapse: collapse; font-size: .8rem; margin-bottom: 8px; }
.viz-grid th, .viz-grid td { border-bottom: 1px solid var(--line); padding: 3px; }
.viz-grid th { text-align: start; font-weight: 600; color: var(--muted); font-size: .74rem; }
.viz-grid input {
  width: 100%; min-width: 108px; border: 1px solid transparent; border-radius: 5px;
  padding: 4px 6px; font: inherit; font-size: .8rem; background: #fbfcfb;
}
.viz-grid input[data-path$=".label"],
.viz-grid input[data-cell="head"] { min-width: 150px; }
.viz-grid input[type="number"] { min-width: 56px; }
.viz-grid input:focus { border-color: var(--teal-200); background: #fff; outline: none; }
.viz-grid input.is-missing { background: #fff8e8; }
.viz-grid .viz-rowbtn {
  border: 0; background: none; cursor: pointer; color: var(--muted); padding: 2px 4px;
  font-size: .8rem;
}
.viz-grid .viz-rowbtn:hover { color: #8a2f14; }
.viz-tools { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.viz-preview-box {
  border: 1px solid var(--line); border-radius: 10px; padding: 8px;
  background: var(--viz-soft); margin-bottom: 10px;
}
.viz-preview-box .viz {
  min-height: 220px; grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto auto auto auto auto;
  grid-template-areas: "q" "canvas" "insight" "derived" "meta"; gap: 5px;
}
.viz-preview-box .viz-canvas { min-height: 180px; }
.viz-preview-box .viz-question, .viz-preview-box .viz-caveat { display: none; }
.viz-preview-box .viz-insight p { font-size: .78rem; }
.viz-shared-banner {
  border: 1px solid #e6cdb8; background: #fffaf4; border-radius: 10px;
  padding: 10px 12px; margin-bottom: 12px; font-size: .82rem;
}
.viz-shared-banner strong { display: block; color: #8a4d22; margin-bottom: 4px; }
.viz-shared-banner .lesson-actions { margin-top: 8px; }
.viz-review-flag {
  display: inline-flex; align-items: center; gap: 6px;
  background: #fdf3e8; color: #8a4d22; border-radius: 6px;
  padding: 3px 8px; font-size: .76rem; margin-bottom: 8px;
}
.viz-footbar {
  position: sticky; bottom: 0; background: #fff; border-top: 1px solid var(--line);
  padding: 10px 16px; display: flex; flex-wrap: wrap; gap: 6px; align-items: center;
}
.viz-footbar .viz-save-state { font-size: .74rem; color: var(--muted); margin-inline-start: auto; }
.viz-json {
  width: 100%; min-height: 180px; font-family: ui-monospace, Consolas, monospace;
  font-size: .76rem; line-height: 1.5; padding: 8px; border: 1px solid var(--line-strong);
  border-radius: 8px;
}
.viz-play {
  position: absolute; inset-block-start: 4px; inset-inline-start: 4px; z-index: 3;
  display: inline-flex; gap: 4px;
}
.viz-play button {
  border: 1px solid rgba(11,58,44,.16); background: rgba(255,255,255,.94);
  border-radius: 999px; font-size: .7rem; padding: 3px 8px; cursor: pointer;
}

/* ---- 手机：课件不再强制 16:9，避免图表被裁切 ---- */
@media (max-width: 760px) {
  .slide { aspect-ratio: auto; height: auto; min-height: 0; }
  .slide.has-viz { min-height: 0; }
  .slide-inner { height: auto; min-height: 76vh; }
  .slide.has-viz .slide-inner { padding: 16px 14px 10px; }
  .slide-visual { min-height: 0; }
  .viz { gap: 4px; grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto auto auto auto auto auto;
    grid-template-areas: "q" "canvas" "insight" "derived" "caveat" "meta"; }
  .viz-canvas { overflow-x: auto; overflow-y: hidden; -webkit-overflow-scrolling: touch; }
  .viz-svg { width: 720px; min-width: 720px; max-width: none; height: auto; flex: none; }
  .viz-path .viz-canvas .viz-svg { width: 720px; min-width: 720px; }
  .viz-scroll-hint { display: block; margin-top: 2px; color: var(--viz-muted); font-size: .68rem; }
  .viz-table .viz-scroll-hint { display: none; }
  .viz-table-wrap { overflow-x: auto; }
  .viz-path .viz-table-wrap { max-height: none; overflow: visible; }
  .viz-table { font-size: .7rem; }
  .viz-table th, .viz-table td { padding: 5px 6px; }
  .viz-insight { padding: 6px 8px; }
  .viz-drawer { width: 100vw; }
  .viz-row2, .viz-row3 { grid-template-columns: 1fr; }
  .viz-edit-btn { font-size: .68rem; padding: 3px 8px; }
}

@media print {
  .viz-edit-btn, .viz-play { display: none !important; }
  .viz[data-reveal="steps"] .viz-flow-lane,
  .viz-table.is-step-table tbody tr { opacity: 1 !important; }
  .viz-insight { break-inside: avoid; }
  .viz-svg { max-height: 110mm; }
}

/* 编辑态：所有分步内容直接可见，避免教师看不到被隐藏的流程 */
.viz-preview-box .viz-flow-lane,
.viz-preview-box .viz-table.is-step-table tbody tr,
.teach-deck .viz-flow-lane,
.teach-deck .viz-table.is-step-table tbody tr { opacity: 1 !important; }
.teach-deck .slide-visual { cursor: default; }
.teach-deck .viz { min-height: 0; }
.h2-sm { font-size: 1.05rem; margin: 22px 0 8px; }
#vizScopeButtons [data-scope].btn-gold { border-color: var(--gold); background: var(--gold-soft); color: var(--green-950); }
.viz-drawer-body .viz-preview-box { position: sticky; top: 0; z-index: 2; }
.viz-drawer-body { scroll-behavior: smooth; }

/* 课件内编辑时让出底部导航，避免保存按钮被遮挡 */
.bottom-nav { transition: transform .2s ease; }
body.viz-editing .bottom-nav { transform: translateY(130%); pointer-events: none; }
.viz-footbar { padding-bottom: calc(10px + env(safe-area-inset-bottom)); }
.viz-drawer-body { overscroll-behavior: contain; }

@media (max-width: 760px) {
  /* 让课件底部能滚到固定导航之上，避免最后一行被永久遮挡 */
  .deck-shell, .reading-view { padding-bottom: 96px; }
}

/* 「数据与图表」中的共享图表预览 */
.teach-chart-card .viz {
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto auto auto auto auto;
  grid-template-areas: "q" "canvas" "insight" "derived" "meta";
}
.teach-chart-card .viz-canvas { min-height: 230px; }
.teach-chart-card .viz-question, .teach-chart-card .viz-caveat { display: none; }
.teach-chart-card .viz-insight p { font-size: .8rem; }

/* ---------------------------------------------------------------- 模块 7：语音输入与朗读 */
.chat-mic { display: inline-flex; align-items: center; gap: 5px; flex: none; }
.chat-mic.is-recording {
  background: #fdecec; border-color: #d9534f; color: #a12b26;
  animation: chat-mic-pulse 1.2s ease-in-out infinite;
}
@keyframes chat-mic-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(217, 83, 79, .28); }
  50% { box-shadow: 0 0 0 6px rgba(217, 83, 79, 0); }
}
.chat-voice {
  border-top: 1px dashed var(--line); margin-top: 8px; padding-top: 8px;
}
.chat-voice-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.chat-voice-lang {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: .78rem; color: var(--muted);
}
.chat-voice-lang select {
  font: inherit; font-size: .78rem; padding: 3px 6px;
  border: 1px solid var(--line-strong); border-radius: 7px; background: #fff; color: var(--ink);
}
.chat-voice-timer {
  font-variant-numeric: tabular-nums; font-weight: 700; color: #a12b26; font-size: .82rem;
}
.chat-voice-state { font-size: .78rem; color: var(--muted); }
.chat-voice-toggles {
  display: flex; flex-wrap: wrap; gap: 16px; margin-top: 6px;
  font-size: .76rem; color: var(--muted);
}
.chat-voice-toggles label { display: inline-flex; align-items: center; gap: 5px; }
.chat-voice-toggles input { width: auto; }
.chat-voice-note { margin: 6px 0 0; font-size: .7rem; line-height: 1.45; color: var(--muted); }
.chat-live {
  margin-top: 10px; padding: 10px 12px; background: #f7faf8;
  border: 1px solid var(--line); border-radius: 12px;
}
.chat-live-top { display: flex; align-items: center; gap: 8px; }
.chat-live-dot {
  width: 9px; height: 9px; flex: none; border-radius: 50%; background: #c3cfc8;
}
.chat-live-dot.is-live {
  background: #1f7a4d; animation: chat-live-pulse 1.3s ease-in-out infinite;
}
@keyframes chat-live-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(31, 122, 77, .35); }
  50% { box-shadow: 0 0 0 6px rgba(31, 122, 77, 0); }
}
.chat-live-state { font-size: .8rem; font-weight: 700; color: var(--ink); }
.chat-live-meter {
  margin-inline-start: auto; width: 96px; height: 6px; flex: none;
  border-radius: 3px; background: #e3ebe6; overflow: hidden;
}
.chat-live-meter i {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, #8ed0aa, #1f7a4d);
  transition: width .12s linear;
}
[dir="rtl"] .chat-live-meter i { background: linear-gradient(270deg, #8ed0aa, #1f7a4d); }
.chat-live-text {
  margin-top: 8px; max-height: 132px; overflow-y: auto;
  font-size: .95rem; line-height: 1.55; color: var(--ink);
  white-space: pre-wrap; word-break: break-word;
}
.chat-live-interim {
  color: #6d8377; text-decoration: underline;
  text-decoration-style: dotted; text-underline-offset: 3px;
}
.chat-live-hint { margin: 8px 0 0; font-size: .72rem; color: var(--muted); }
.chat-mic.is-waiting { opacity: .72; }

/* ---------------------------------------------------------------- 模块 10：自测结果与批阅 */
.quiz-result-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.quiz-score { display: flex; align-items: baseline; gap: 6px; margin: 10px 0 4px; }
.quiz-score strong { font-size: 2.1rem; line-height: 1; }
.quiz-score span { font-size: 1rem; color: var(--muted); }
.quiz-meta {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px; margin: 12px 0 0; padding-top: 12px; border-top: 1px solid var(--line);
}
.quiz-meta div { margin: 0; }
.quiz-meta dt { font-size: .72rem; color: var(--muted); margin: 0; }
.quiz-meta dd { margin: 2px 0 0; font-weight: 700; font-size: .92rem; }
.quiz-result-list { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 12px; }
.quiz-result-item h3 { margin: 8px 0 6px; font-size: 1rem; }
.quiz-answers { display: grid; gap: 4px; margin-bottom: 6px; }
.quiz-answers p { margin: 0; font-size: .9rem; }
.quiz-text { white-space: pre-wrap; word-break: break-word; }
.quiz-answer-feedback { margin: 8px 0 0; padding: 8px 10px; background: #f5f8f6; border-radius: 8px; font-size: .88rem; }
.quiz-overall { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--line); }
.quiz-overall h3 { margin: 0 0 6px; font-size: .95rem; }
.quiz-last { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.quiz-last .grow { flex: 1; }
.quiz-last p { margin: 2px 0; }
.quiz-alert { border-color: #e6c07a; background: #fdf7e9; }
.field-error { display: block; color: #a12b26; font-size: .8rem; margin-top: 4px; }
input[aria-invalid="true"] { border-color: #a12b26; }
.quiz-card.is-unanswered { border-color: #d98324; box-shadow: inset 3px 0 0 #d98324; }
.quiz-card.is-unanswered legend::after { content: " •"; color: #b45309; }
.chip-ok { background: #e8f5ec; color: #1f7a4d; }
.chip-warn { background: #fdf3e3; color: #8a5a16; }
.badge-ok { background: #e8f5ec; color: #1f7a4d; }
.badge-bad { background: #fdecec; color: #a12b26; }
.badge-warn { background: #fdf3e3; color: #8a5a16; }
.quiz-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px; margin: 12px 0;
}
.quiz-stat {
  background: #fff; border: 1px solid var(--line); border-radius: 10px;
  padding: 10px 12px; display: grid; gap: 4px;
}
.quiz-stat strong { font-size: 1.15rem; }
.quiz-settings { display: grid; gap: 8px; margin-top: 8px; }
.quiz-settings label { display: flex; align-items: center; gap: 6px; font-size: .85rem; }
.quiz-settings input[type="number"] { width: 90px; }
.quiz-settings select { max-width: 220px; }
.table tr.is-current td { background: #f5f8f6; font-weight: 700; }
.chat-voice [hidden], .chat-actions [hidden] { display: none !important; }
.chat-local-badge {
  display: inline-block; margin-top: 6px; padding: 2px 8px; border-radius: 999px;
  background: #fdf3e8; color: #8a4d22; font-size: .7rem;
}
.chat-speak-error { margin: 6px 0 0; font-size: .76rem; color: #a12b26; }
.chat-msg.is-speaking .chat-bubble {
  box-shadow: inset 3px 0 0 var(--teal-600, #12806b);
}
[dir="rtl"] .chat-mic-label { order: 0; }
@media (max-width: 760px) {
  .chat-mic-label { display: none; }
  .chat-voice-toggles { gap: 10px; }
  .chat-voice-note { font-size: .68rem; }
}

/* ---- 模块 13：媒体点选、拖动排序、PDF 阅读器 ---- */
.media-field { border:1px solid #e4ddd2; border-radius:12px; padding:10px; margin-block:8px; }
.media-field .media-preview { min-height:110px; display:flex; align-items:center; justify-content:center; background:#faf8f4; border-radius:8px; overflow:hidden; }
.media-field .media-preview img { max-width:100%; max-height:180px; object-fit:cover; }
.field-label { display:block; font-size:.78rem; color:#6b6257; margin-top:6px; }
.media-meta input { width:100%; margin-bottom:6px; }
.media-modal { width:min(960px, 94vw); max-height:86vh; padding:16px; border-radius:16px; border:1px solid #e4ddd2; }
.media-modal::backdrop { background:rgba(0,0,0,.35); }
.media-modal-head { display:flex; justify-content:space-between; align-items:center; }
.media-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(140px,1fr)); gap:10px; max-height:56vh; overflow:auto; margin-top:10px; }
.media-card { border:1px solid #e4ddd2; border-radius:10px; background:#fff; padding:6px; text-align:left; display:flex; flex-direction:column; gap:2px; }
.media-card img { width:100%; height:96px; object-fit:cover; border-radius:6px; }
.media-card:hover { outline:2px solid #b58b3a; }
.media-title { font-size:.82rem; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.media-pager { display:flex; gap:8px; align-items:center; justify-content:flex-end; margin-top:8px; }
.file-btn { cursor:pointer; }
.drag-handle { cursor:grab; user-select:none; padding:2px 6px; border-radius:6px; color:#8a7b66; background:#f4efe6; }
.drag-handle:active { cursor:grabbing; }
tr.is-dragging, fieldset.is-dragging { opacity:.5; }
tr.drop-before td { box-shadow: inset 0 3px 0 #b58b3a; }
tr.drop-after td { box-shadow: inset 0 -3px 0 #b58b3a; }
fieldset.drop-before { box-shadow: inset 0 3px 0 #b58b3a; }
fieldset.drop-after { box-shadow: inset 0 -3px 0 #b58b3a; }
.pdf-toolbar { display:flex; flex-wrap:wrap; gap:6px; align-items:center; position:sticky; top:0; background:#fff; padding:8px; z-index:2; border-bottom:1px solid #e4ddd2; }
.pdf-page-input input { width:64px; }
.pdf-sep { width:1px; height:22px; background:#e4ddd2; margin:0 6px; }
.pdf-stage { position:relative; min-height:320px; background:#f2eee7; border-radius:12px; padding:12px; text-align:center; margin-bottom:96px; }
.pdf-stage img { max-width:100%; margin:0 auto; box-shadow:0 4px 18px rgba(0,0,0,.12); background:#fff; }
.pdf-loading, .pdf-error { position:absolute; inset:0; display:flex; flex-direction:column; gap:10px; align-items:center; justify-content:center; }
/* hidden 属性必须压过上面的 display:flex，否则加载层与错误层会盖在已渲染的页面上 */
.pdf-loading[hidden], .pdf-error[hidden] { display: none !important; }
.pdf-viewer.is-faux-full { position:fixed; inset:0; z-index:99; background:#fff; overflow:auto; padding:8px; }
@media (max-width:640px) { .pdf-toolbar { font-size:.85rem; } .pdf-stage { padding:6px; } }