/* ===========================================================
   岩矿标本科普 — 通用样式
   纯静态站点，无外部依赖
   =========================================================== */

:root {
  --ink: #1d3038;
  --ink-2: #46606c;
  --ink-3: #7d919b;
  --paper: #f6f4ef;
  --card: #ffffff;
  --line: #e4dfd5;
  --brand: #1f4a5c;
  --brand-soft: #e8f0f2;
  --accent: #b96a35;
  --accent-soft: #fbeee4;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow-1: 0 1px 2px rgba(29, 48, 56, .06), 0 4px 14px rgba(29, 48, 56, .06);
  --shadow-2: 0 6px 18px rgba(29, 48, 56, .12), 0 18px 40px rgba(29, 48, 56, .10);
  --maxw: 1200px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------------- 顶部导航 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 244, 239, .88);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 66px;
}

.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .3px; }

.logo-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: linear-gradient(140deg, var(--brand), #2f7d8c 60%, var(--accent));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .25);
}

.logo-text { font-size: 17px; }
.logo-sub { font-size: 12px; color: var(--ink-3); font-weight: 400; margin-left: 2px; }

.nav { margin-left: auto; display: flex; gap: 6px; }

.nav a {
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--ink-2);
  transition: background .18s, color .18s;
}

.nav a:hover { background: var(--brand-soft); color: var(--brand); }
.nav a.active { background: var(--brand); color: #fff; }

/* ---------------- Hero ---------------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 62px 0 54px;
  background:
    radial-gradient(900px 320px at 12% -10%, rgba(47, 125, 140, .16), transparent 70%),
    radial-gradient(700px 300px at 90% 0%, rgba(185, 106, 53, .16), transparent 70%),
    linear-gradient(180deg, #fffdf9, var(--paper));
  border-bottom: 1px solid var(--line);
}

.hero::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 6px;
  background: repeating-linear-gradient(
    90deg,
    rgba(31, 74, 92, .30) 0 26px,
    rgba(185, 106, 53, .30) 26px 52px,
    rgba(31, 74, 92, .10) 52px 78px
  );
  opacity: .55;
}

.hero-inner { position: relative; z-index: 1; max-width: 760px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 5px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  font-size: 13px;
  color: var(--ink-2);
  letter-spacing: .5px;
}

.eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.3;
  letter-spacing: .5px;
}

.hero h1 em { font-style: normal; color: var(--brand); }

.hero p { margin: 0; color: var(--ink-2); font-size: 16px; }

.hero-stats { display: flex; flex-wrap: wrap; gap: 34px; margin-top: 30px; }
.hero-stats b { display: block; font-size: 24px; line-height: 1.2; color: var(--brand); }
.hero-stats span { font-size: 13px; color: var(--ink-3); }

/* ---------------- 工具条（搜索 + 筛选） ---------------- */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  padding: 30px 0 8px;
}

.search {
  position: relative;
  flex: 1 1 260px;
  max-width: 380px;
}

.search svg { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); color: var(--ink-3); }

.search input {
  width: 100%;
  height: 44px;
  padding: 0 14px 0 40px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  font-size: 14px;
  color: var(--ink);
  outline: none;
  transition: border-color .18s, box-shadow .18s;
  font-family: inherit;
}

.search input:focus { border-color: #9dc0c9; box-shadow: 0 0 0 4px rgba(47, 125, 140, .12); }
.search input::placeholder { color: var(--ink-3); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  font-size: 13.5px;
  color: var(--ink-2);
  cursor: pointer;
  transition: all .18s;
  font-family: inherit;
}

.chip:hover { border-color: #bfd4d9; color: var(--brand); }
.chip.is-on { background: var(--brand); border-color: var(--brand); color: #fff; }

.result-tip { margin: 4px 0 20px; font-size: 13.5px; color: var(--ink-3); }

/* ---------------- 卡片网格 ---------------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(272px, 1fr));
  gap: 24px;
  padding-bottom: 60px;
}

.card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s;
}

.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-2); border-color: #d7cfc0; }

.card-media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #ece9e2;
}

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s cubic-bezier(.2, .7, .3, 1);
}

.card:hover .card-media img { transform: scale(1.06); }

.card-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(20, 34, 40, .34));
}

.badge {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  padding: 4px 11px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .93);
  font-size: 12px;
  color: var(--brand);
  letter-spacing: .4px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, .12);
}

.card-body { display: flex; flex-direction: column; flex: 1; padding: 16px 18px 18px; }

.card-title { margin: 0; font-size: 18px; letter-spacing: .3px; }

.card-en {
  margin: 3px 0 10px;
  font-size: 12.5px;
  color: var(--ink-3);
  font-style: italic;
  letter-spacing: .3px;
}

.card-desc {
  margin: 0 0 14px;
  font-size: 13.5px;
  color: var(--ink-2);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-foot {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px;
  color: var(--ink-3);
}

.card-foot .more { margin-left: auto; color: var(--accent); font-weight: 600; }
.card:hover .card-foot .more { text-decoration: underline; }

.empty {
  grid-column: 1 / -1;
  padding: 70px 20px;
  text-align: center;
  color: var(--ink-3);
  background: #fff;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
}

/* ---------------- 详情页 ---------------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 13.5px;
  color: var(--ink-3);
}

.breadcrumb a:hover { color: var(--brand); }
.breadcrumb .sep { opacity: .5; }
.breadcrumb .cur { color: var(--ink); }

.detail-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
  gap: 34px;
  align-items: start;
  padding: 22px 0 40px;
}

.figure {
  margin: 0;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.figure img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }

.figure figcaption {
  padding: 11px 16px;
  font-size: 12.5px;
  color: var(--ink-3);
  border-top: 1px solid var(--line);
  background: #fcfbf8;
}

.detail-title { margin: 0 0 6px; font-size: clamp(26px, 3.2vw, 34px); letter-spacing: .6px; }
.detail-en { margin: 0 0 16px; font-size: 14px; font-style: italic; color: var(--ink-3); letter-spacing: .3px; }

.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }

.tag {
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 12.5px;
}

.tag.warm { background: var(--accent-soft); color: var(--accent); }

.lead {
  margin: 0 0 22px;
  padding-left: 14px;
  border-left: 3px solid var(--accent);
  color: var(--ink-2);
  font-size: 15px;
}

.meta-list { display: grid; gap: 12px; margin: 0; }

.meta-list .row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
}

.meta-list .row:last-child { border-bottom: 0; padding-bottom: 0; }
.meta-list dt { color: var(--ink-3); font-size: 13.5px; }
.meta-list dd { margin: 0; color: var(--ink); }

.formula {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  background: #f2f6f7;
  border: 1px solid #dbe7ea;
  font-family: "Cambria Math", "Times New Roman", Georgia, serif;
  font-size: 16px;
  letter-spacing: .5px;
  color: var(--brand);
}

/* 内容区 */
.section {
  margin-bottom: 30px;
  padding: 26px 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}

.section-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.section-head h2 { margin: 0; font-size: 18px; letter-spacing: .5px; }
.section-head .bar { width: 4px; height: 17px; border-radius: 2px; background: var(--accent); }

.prop-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 0 32px;
}

.prop {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14.5px;
}

.prop dt { color: var(--ink-3); font-size: 13.5px; }
.prop dd { margin: 0; color: var(--ink); }

.prose { margin: 0; color: var(--ink-2); font-size: 15px; text-align: justify; }
.prose + .prose { margin-top: 12px; }

.pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 6px 0 64px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  font-size: 14px;
  color: var(--ink-2);
  transition: all .18s;
}

.btn:hover { border-color: var(--brand); color: var(--brand); }

.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.primary:hover { background: #173b4a; color: #fff; }
.btn[aria-disabled="true"] { opacity: .4; pointer-events: none; }

/* ---------------- 页脚 ---------------- */
.site-footer {
  padding: 34px 0;
  background: #17272e;
  color: #93a8b1;
  font-size: 13px;
}

.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center; }
.site-footer b { color: #e8eef0; font-weight: 600; }
.site-footer .sp { margin-left: auto; }

/* ---------------- 分类引导页 ---------------- */
.hero-center { max-width: 720px; text-align: center; }
.hero-center .hero-stats { justify-content: center; }

.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(208px, 1fr));
  gap: 24px;
  padding: 40px 0 72px;
}

.cat-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s;
}

.cat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-2); border-color: #d7cfc0; }

.cat-media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #ece9e2;
}

.cat-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s cubic-bezier(.2, .7, .3, 1);
}

.cat-card:hover .cat-media img { transform: scale(1.06); }

.cat-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(20, 34, 40, .34));
}

.cat-count {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  padding: 4px 11px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .93);
  font-size: 12px;
  color: var(--brand);
  letter-spacing: .4px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, .12);
}

.cat-body { display: flex; flex-direction: column; flex: 1; padding: 16px 18px 18px; }

.cat-name { margin: 0; font-size: 19px; letter-spacing: .5px; }

.cat-en {
  margin: 3px 0 10px;
  font-size: 12.5px;
  color: var(--ink-3);
  font-style: italic;
  letter-spacing: .3px;
}

.cat-desc {
  margin: 0 0 14px;
  font-size: 13.5px;
  color: var(--ink-2);
  line-height: 1.7;
}

.cat-go {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px;
  color: var(--accent);
  font-weight: 600;
}

.cat-card:hover .cat-go { text-decoration: underline; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 900px) {
  .detail-hero { grid-template-columns: 1fr; gap: 24px; }
  .hero { padding: 44px 0 40px; }
  .grid { gap: 18px; }
}

@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  .site-header .wrap { height: 58px; }
  .logo-sub { display: none; }
  .nav a { padding: 6px 10px; font-size: 13px; }
  .hero-stats { gap: 22px; }
  .cat-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 16px; }
  .section { padding: 20px 18px; }
  .prop { grid-template-columns: 78px minmax(0, 1fr); }
  .pager { flex-direction: column; }
}