/* ===== 标本馆 AI 科普教学方案 — 样式 v2 ===== */

:root {
  --paper: #f7f7f5;
  --gallery: #ffffff;
  --ink: #1c1c1a;
  --ink-soft: #5b594f;
  --navy: #1f3358;
  --navy-deep: #142238;
  --kraft: #a9773f;
  --kraft-bg: #f3e8d4;
  --brick: #8a3a2c;
  --brick-bg: #f8ece7;
  --line: #e2e0d8;
  --card: #ffffff;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei",
          -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--navy); text-decoration-color: var(--line); }
a:hover { color: var(--kraft); }

.wrap { max-width: 900px; margin: 0 auto; padding: 0 28px; }

/* ---------- 顶部导航 ---------- */
.catalog-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
}
.catalog-nav .wrap {
  max-width: 1060px;
  display: flex;
  align-items: center;
  gap: 24px;
  padding-top: 14px;
  padding-bottom: 14px;
  overflow-x: auto;
  scrollbar-width: none;
}
.catalog-nav .wrap::-webkit-scrollbar { display: none; }
.nav-mark {
  font-weight: 700;
  color: var(--navy-deep);
  white-space: nowrap;
  font-size: 15px;
  padding-right: 16px;
  border-right: 1px solid var(--line);
  flex-shrink: 0;
}
.catalog-nav a {
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  font-weight: 500;
}
.catalog-nav a:hover { color: var(--navy); }

/* ---------- Hero：照片 + 展签牌，两段分开 ---------- */
.hero-media {
  height: 46vh;
  min-height: 320px;
  max-height: 480px;
  overflow: hidden;
  position: relative;
  background: var(--navy-deep);
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-plate {
  background: var(--navy-deep);
  background-image: linear-gradient(155deg, var(--navy-deep) 0%, var(--navy) 100%);
  color: #f3f1e9;
  padding: 44px 0 46px;
}
.tag-chip {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--navy-deep);
  background: var(--kraft-bg);
  border: 1px solid var(--kraft);
  border-radius: 2px;
  padding: 4px 10px;
  margin-bottom: 18px;
}
.hero-plate h1 {
  font-size: clamp(28px, 4.2vw, 42px);
  line-height: 1.35;
  margin: 0 0 14px;
  font-weight: 800;
  letter-spacing: 0.5px;
}
.hero-plate p.lead {
  font-size: 16.5px;
  color: #cfd4de;
  max-width: 620px;
  margin: 0;
  line-height: 1.85;
}

/* ---------- Section 基础 ---------- */
section { padding: 58px 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: none; }

.sec-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 24px;
}
.sec-head .sec-num { margin-top: 4px; }
.sec-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--navy);
  border: 1.5px solid var(--navy);
  border-radius: 2px;
  padding: 4px 9px;
  flex-shrink: 0;
  background: #fff;
  transform: rotate(-1.2deg);
}
h2 {
  font-size: 25px;
  color: var(--navy-deep);
  margin: 0;
  font-weight: 800;
  letter-spacing: 0.2px;
}
.eng {
  display: block;
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  font-weight: 400;
  font-size: 13px;
  color: var(--kraft);
  letter-spacing: 0.3px;
  margin-top: 3px;
}
.hero-plate .eng { color: #b7925e; font-size: 14px; margin-top: 6px; }
.case-eyebrow .eng, .tag-chip .eng { display: inline; margin: 0 0 0 6px; font-size: 12px; }
h3 {
  font-size: 19px;
  color: var(--ink);
  margin: 32px 0 10px;
  font-weight: 700;
}
h3:first-of-type { margin-top: 6px; }
h4 { font-size: 16px; font-weight: 700; color: var(--ink); }

p { margin: 0 0 16px; }
strong { color: var(--navy-deep); font-weight: 700; }

ul.plain { padding-left: 20px; margin: 0 0 16px; }
ul.plain li { margin-bottom: 8px; }

/* ---------- 结论卡片 ---------- */
.conclusion-grid { display: grid; gap: 14px; margin-top: 20px; }
.conclusion-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--navy);
  border-radius: 2px;
  padding: 18px 22px;
}
.conclusion-card.secondary { border-top-color: var(--kraft); }
.conclusion-card.caution { border-top-color: var(--brick); }
.conclusion-card .tag {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}
.conclusion-card.priority .tag { color: var(--navy); }
.conclusion-card.secondary .tag { color: var(--kraft); }
.conclusion-card.caution .tag { color: var(--brick); }

/* ---------- 图片 + 标本标签 caption ---------- */
figure.specimen { margin: 26px 0; }
figure.specimen img {
  border-radius: 2px;
  border: 1px solid var(--line);
}
figure.specimen figcaption {
  margin-top: 10px;
  font-size: 13.5px;
  color: var(--ink-soft);
  padding-left: 12px;
  border-left: 2px solid var(--kraft);
  line-height: 1.6;
}
.img-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.img-row figure.specimen { margin: 0; }
@media (max-width: 640px) { .img-row { grid-template-columns: 1fr; } }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; margin: 20px 0; }
table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  font-size: 14.5px;
  min-width: 560px;
}
th, td {
  text-align: left;
  padding: 12px 14px;
  border: 1px solid var(--line);
  vertical-align: top;
}
th {
  background: var(--navy-deep);
  color: #f3f1e9;
  font-weight: 700;
  font-size: 13.5px;
}
tr:nth-child(even) td { background: var(--paper); }

/* ---------- 案例卡 ---------- */
.case {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 26px 28px;
  margin: 22px 0 30px;
  position: relative;
}
.case-eyebrow {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--navy);
  background: #fff;
  border: 1px solid var(--navy);
  border-radius: 2px;
  padding: 3px 9px;
  margin-bottom: 12px;
}
.case-eyebrow.adv { color: var(--kraft); border-color: var(--kraft); background: var(--kraft-bg); }
.case-eyebrow.caution { color: var(--brick); border-color: var(--brick); background: var(--brick-bg); }
.case h3 { margin-top: 0; }

.embed-frame {
  margin: 18px 0;
  border-radius: 2px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #10161f;
}
.embed-frame iframe { width: 100%; height: 420px; border: 0; display: block; }
.embed-note { font-size: 13px; color: var(--ink-soft); margin-top: -8px; margin-bottom: 16px; }

.link-line { font-size: 14.5px; margin: 6px 0; word-break: break-all; }
.link-line .lbl { color: var(--ink); font-weight: 700; }

.quote {
  font-size: 17px;
  font-weight: 600;
  color: var(--navy-deep);
  background: var(--paper);
  border-left: 3px solid var(--kraft);
  padding: 14px 18px;
  margin: 18px 0;
  line-height: 1.7;
}
.quote cite {
  display: block;
  font-style: normal;
  font-weight: 400;
  font-size: 13px;
  color: var(--ink-soft);
  margin-top: 8px;
}

/* ---------- 提醒清单 ---------- */
.alert-list { display: grid; gap: 14px; margin-top: 20px; }
.alert-item {
  background: var(--brick-bg);
  border: 1px solid #e0c2b8;
  border-radius: 2px;
  padding: 16px 20px;
}
.alert-item .h { color: var(--brick); font-weight: 700; margin-bottom: 4px; }

/* ---------- 路线图 ---------- */
.roadmap { margin-top: 20px; }
.stage {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 20px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}
.stage:last-child { border-bottom: 1px solid var(--line); }
.stage-label { font-weight: 800; color: var(--navy); font-size: 15px; }
.stage-label small {
  display: block;
  font-weight: 400;
  color: var(--ink-soft);
  font-size: 12.5px;
  margin-top: 4px;
  line-height: 1.5;
}
.stage-body p { margin: 0 0 6px; }
.stage-meta { font-size: 13.5px; color: var(--ink-soft); }
@media (max-width: 560px) {
  .stage { grid-template-columns: 1fr; gap: 6px; }
}

/* ---------- 参考链接 ---------- */
.ref-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 22px; }
@media (max-width: 640px) { .ref-grid { grid-template-columns: 1fr; } }
.ref-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--navy);
  border-radius: 2px;
  padding: 14px 16px;
}
.ref-card .name { font-weight: 700; font-size: 14.5px; margin-bottom: 2px; }
.ref-card .desc { font-size: 13px; color: var(--ink-soft); margin-bottom: 6px; }
.ref-card .url { font-size: 13px; word-break: break-all; }

/* ---------- 原创图示 ---------- */
.diagram {
  margin: 24px 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 22px 20px 16px;
}
.diagram-title {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--ink-soft);
  margin-bottom: 14px;
}
.scenario-diagram {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 14px;
  align-items: center;
}
.scenario-col { text-align: center; padding: 6px; }
.scenario-col svg { width: 52px; height: 52px; margin: 0 auto 10px; display: block; }
.scenario-col .t { font-weight: 700; font-size: 14.5px; color: var(--navy-deep); margin-bottom: 4px; }
.scenario-col .d { font-size: 12.5px; color: var(--ink-soft); line-height: 1.55; }
.scenario-vs {
  font-size: 12px;
  color: var(--line);
  font-weight: 700;
  writing-mode: vertical-rl;
}
@media (max-width: 600px) {
  .scenario-diagram { grid-template-columns: 1fr; }
  .scenario-vs { writing-mode: horizontal-tb; text-align: center; }
}

.flow-diagram {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}
.flow-step {
  flex: 1;
  min-width: 130px;
  text-align: center;
  padding: 14px 10px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 3px;
}
.flow-step svg { width: 30px; height: 30px; margin: 0 auto 8px; display: block; color: var(--navy); }
.flow-step .t { font-size: 13.5px; font-weight: 700; color: var(--navy-deep); margin-bottom: 2px; }
.flow-step .d { font-size: 12px; color: var(--ink-soft); }
.flow-arrow { flex: 0 0 20px; text-align: center; color: var(--kraft); font-size: 18px; }
@media (max-width: 640px) {
  .flow-diagram { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
}

.case-icon {
  width: 38px; height: 38px;
  color: var(--navy);
  margin-bottom: 10px;
}
.case-icon.adv { color: var(--kraft); }
.case-icon.caution { color: var(--brick); }

footer {
  padding: 36px 0 64px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 13px;
}