/* ==========================================================================
   超凡棋牌 · 共享样式表  /assets/site.css
   气质：深夜棋牌厅 + 旧档案室。墨绿夜色、暖铜金刻度、象牙白纸面。
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

body,
h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd, hr { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #0B2620;
  --ink-800: #123A32;
  --ink-600: #1F5A4A;
  --copper: #C08A3E;
  --copper-soft: #E3BE7E;
  --ivory: #F6F1E4;
  --paper: #EDE4D2;
  --cinnabar: #A8322A;
  --graphite: #2B2F2D;
  --silver: #9AA5A0;

  --line-copper: rgba(192, 138, 62, 0.48);
  --line-copper-soft: rgba(227, 190, 126, 0.32);
  --line-paper: rgba(43, 47, 45, 0.16);
  --body-text: #4A514E;

  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", "SimSun", serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  --fs-1: clamp(30px, 5.2vw, 48px);
  --fs-2: clamp(24px, 3.4vw, 32px);
  --fs-3: clamp(19px, 2.2vw, 22px);
  --fs-4: 16px;
  --fs-5: 13px;

  --wrap: 1200px;
  --gutter: clamp(16px, 4vw, 40px);
  --dur: 220ms;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  --shadow-card: 0 1px 0 rgba(43, 47, 45, 0.06), 0 14px 28px -22px rgba(11, 38, 32, 0.6);
  --shadow-float: 0 20px 44px -28px rgba(11, 38, 32, 0.95);
}

/* ---------- 3. 中文排版基底 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ivory);
  background-image:
    linear-gradient(180deg, rgba(237, 228, 210, 0.55) 0, rgba(246, 241, 228, 0) 420px),
    repeating-linear-gradient(0deg, rgba(43, 47, 45, 0.028) 0 1px, transparent 1px 28px);
  color: var(--graphite);
  font-family: var(--font-sans);
  font-size: var(--fs-4);
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: 0.02em;
  color: var(--ink-800);
}
h1 { font-size: var(--fs-1); }
h2 { font-size: var(--fs-2); }
h3 { font-size: var(--fs-3); }
h4 { font-size: var(--fs-4); font-weight: 500; }

small { font-size: var(--fs-5); color: var(--silver); }

.num, .mono, [data-year] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
}

::selection { background: var(--copper); color: var(--ink-900); }

:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 3px;
  border-radius: 4px;
}

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

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  left: var(--gutter);
  top: -120px;
  z-index: 200;
  padding: 10px 20px;
  font-size: var(--fs-5);
  letter-spacing: 0.08em;
  color: var(--copper-soft);
  background: var(--ink-900);
  border: 1px solid var(--copper);
  border-radius: 999px;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 14px; }

/* ---------- 5. 顶部：悬浮胶囊 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px var(--gutter) 0;
  pointer-events: none;
}
.site-header > * { pointer-events: auto; }

.nav-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 9px 12px 9px 16px;
  background: var(--ink-800);
  border: 1px solid var(--line-copper-soft);
  border-radius: 999px;
  box-shadow: var(--shadow-float);
  transition: padding var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.site-header[data-collapsed] { padding-top: 6px; }
.site-header[data-collapsed] .nav-shell { padding-block: 7px; background: var(--ink-900); }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding-right: 10px;
  color: var(--ivory);
}
.brand__mark {
  width: 14px;
  height: 14px;
  flex: none;
  border-radius: 3px;
  background: linear-gradient(135deg, var(--copper-soft), var(--copper));
  box-shadow: 0 0 0 1px rgba(11, 38, 32, 0.7), 0 0 0 5px rgba(192, 138, 62, 0.14);
  transition: transform var(--dur) var(--ease);
}
.brand:hover .brand__mark { transform: rotate(45deg); }
.brand__mark--lg { width: 17px; height: 17px; }
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.1em;
}
.brand__meta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--copper-soft);
  opacity: 0.85;
}

.nav { display: flex; flex: 1 1 auto; justify-content: flex-end; }
.nav__list { display: flex; align-items: center; gap: 2px; }
.nav__item { display: inline-flex; }

.nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 13px;
  border-radius: 999px;
  font-size: 14px;
  letter-spacing: 0.05em;
  color: rgba(246, 241, 228, 0.78);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 13px; right: 13px; bottom: 4px;
  height: 1px;
  background: var(--copper);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav__link:hover { color: var(--ivory); background: rgba(227, 190, 126, 0.1); }
.nav__link:hover::after { transform: scaleX(1); }
.nav__link[aria-current="page"] {
  color: var(--copper-soft);
  background: rgba(192, 138, 62, 0.16);
}
.nav__link[aria-current="page"]::after { transform: scaleX(1); background: var(--copper-soft); }

.nav-current {
  display: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--copper-soft);
  white-space: nowrap;
}
.nav-current:empty { display: none !important; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 8px 15px 8px 13px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--copper-soft);
  border: 1px solid var(--line-copper);
  border-radius: 999px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.nav-toggle__dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--copper);
  box-shadow: 0 0 0 3px rgba(192, 138, 62, 0.18);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.nav-toggle__label { line-height: 1; }
.nav-toggle::after {
  content: "⌄";
  font-size: 14px;
  line-height: 1;
  transition: transform var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--copper); background: rgba(192, 138, 62, 0.12); transform: translateY(-1px); }
.nav-toggle[aria-expanded="true"] { border-color: var(--copper); background: rgba(192, 138, 62, 0.16); }
.nav-toggle[aria-expanded="true"] .nav-toggle__dot { background: var(--cinnabar); box-shadow: 0 0 0 3px rgba(168, 50, 42, 0.22); }
.nav-toggle[aria-expanded="true"]::after { transform: rotate(180deg); }

.header-progress {
  position: absolute;
  left: 24px; right: 24px; bottom: 3px;
  height: 2px;
  border-radius: 2px;
  pointer-events: none;
  background-image: linear-gradient(
    90deg,
    var(--copper) 0 var(--progress, 0%),
    rgba(227, 190, 126, 0.1) var(--progress, 0%) 100%
  );
}

.header-ticker {
  display: flex;
  align-items: center;
  gap: 10px;
  width: max-content;
  max-width: 100%;
  margin-top: -1px;
  padding: 6px 18px 7px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: rgba(227, 190, 126, 0.92);
  background: var(--ink-900);
  border: 1px solid var(--line-copper-soft);
  border-top: 0;
  border-radius: 0 0 16px 16px;
  box-shadow: 0 16px 26px -24px rgba(11, 38, 32, 0.95);
}
.site-header[data-collapsed] .header-ticker { display: none; }
.header-ticker__badge {
  padding: 1px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-900);
  background: var(--copper);
  border-radius: 999px;
}
.header-ticker__text { color: rgba(246, 241, 228, 0.72); }
.header-ticker__link {
  color: var(--copper-soft);
  border-bottom: 1px solid var(--line-copper);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.header-ticker__link:hover { color: var(--ivory); border-color: var(--copper); }

/* 断点：<900px 一律折叠成按键 */
@media (max-width: 899px) {
  .nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav-current:not(:empty) { display: inline-block; }
  .brand__meta { display: none; }
  .brand__name { font-size: 16px; }
  .header-progress { left: 18px; right: 18px; }
}

/* 断点：>=900px 首屏内展开，滚动后收窄 */
@media (min-width: 900px) {
  .site-header[data-collapsed] .nav { display: none; }
  .site-header[data-collapsed] .nav-toggle { display: inline-flex; }
  .site-header[data-collapsed] .nav-current:not(:empty) { display: inline-block; }
  .site-header[data-collapsed] .brand__meta { display: none; }
}

/* 展开态：桌面收窄与移动端共用同一套下拉面板 */
.nav-shell[data-open] .nav {
  display: block;
  position: absolute;
  top: calc(100% + 10px);
  left: 0; right: 0;
  z-index: 6;
  padding: 10px;
  background: var(--ink-900);
  border: 1px solid var(--line-copper);
  border-radius: 20px;
  box-shadow: var(--shadow-float);
  animation: nav-drop 180ms var(--ease) both;
}
.nav-shell[data-open] .nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
.nav-shell[data-open] .nav__item { display: block; }
.nav-shell[data-open] .nav__link {
  display: block;
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 15px;
}
.nav-shell[data-open] .nav__link::after { display: none; }
.nav-shell[data-open] .nav__link:hover { background: rgba(227, 190, 126, 0.12); }
.nav-shell[data-open] .nav__link[aria-current="page"] {
  background: rgba(192, 138, 62, 0.18);
  box-shadow: inset 3px 0 0 var(--copper);
}

@keyframes nav-drop {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 6. 页脚：摊开的档案纸 ---------- */
.site-footer {
  margin-top: clamp(48px, 8vw, 96px);
  color: rgba(246, 241, 228, 0.76);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(180deg, rgba(11, 38, 32, 0.94), rgba(11, 38, 32, 1)),
    repeating-linear-gradient(90deg, rgba(227, 190, 126, 0.05) 0 1px, transparent 1px 64px);
  border-top: 1px solid var(--line-copper);
}

.footer-scale {
  display: flex;
  justify-content: space-between;
  gap: 6px;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 18px var(--gutter) 14px;
  border-bottom: 1px dashed rgba(227, 190, 126, 0.26);
  overflow-x: auto;
  scrollbar-width: none;
}
.footer-scale::-webkit-scrollbar { display: none; }
.footer-scale__item {
  position: relative;
  flex: 0 0 auto;
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(154, 165, 160, 0.92);
}
.footer-scale__item::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 1px; height: 7px;
  background: rgba(227, 190, 126, 0.35);
}
.footer-scale__item[data-peak] { color: var(--copper-soft); }
.footer-scale__item[data-peak]::before { height: 11px; background: var(--copper); }

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.3fr;
  gap: clamp(20px, 3vw, 40px);
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(28px, 4vw, 48px) var(--gutter);
}
@media (max-width: 1023px) { .footer-inner { grid-template-columns: 1fr 1fr; } }
@media (max-width: 639px) { .footer-inner { grid-template-columns: 1fr; gap: 26px; } }

.footer-brand__name {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ivory);
}
.footer-brand__note {
  margin-top: 12px;
  max-width: 34ch;
  font-size: var(--fs-5);
  line-height: 2;
  color: rgba(154, 165, 160, 0.95);
}

.footer-col__title {
  position: relative;
  margin-bottom: 14px;
  padding-bottom: 10px;
  font-family: var(--font-serif);
  font-size: 15px;
  letter-spacing: 0.14em;
  color: var(--copper-soft);
  border-bottom: 1px solid rgba(227, 190, 126, 0.22);
}
.footer-col__title::after {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  width: 28px; height: 1px;
  background: var(--copper);
}
.footer-col__list { display: flex; flex-direction: column; gap: 2px; }
.footer-col__list a {
  position: relative;
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: rgba(246, 241, 228, 0.76);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.footer-col__list a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 2px;
  width: 100%; height: 1px;
  background: var(--copper);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}
.footer-col__list a:hover { color: var(--copper-soft); transform: translateX(2px); }
.footer-col__list a:hover::after { transform: scaleX(1); }

.footer-col__list--plain { gap: 4px; }
.footer-col__list--plain li {
  font-size: var(--fs-5);
  line-height: 2;
  color: rgba(154, 165, 160, 0.95);
  word-break: break-word;
}
.footer-col--info { min-width: 0; }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 16px var(--gutter) 26px;
  border-top: 1px solid rgba(227, 190, 126, 0.18);
  font-size: var(--fs-5);
  color: rgba(154, 165, 160, 0.95);
}
.footer-legal__list { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.footer-legal__list a {
  color: rgba(246, 241, 228, 0.7);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-legal__list a:hover { color: var(--copper-soft); border-color: var(--copper); }
.footer-legal__note { font-family: var(--font-mono); letter-spacing: 0.08em; }
.footer-warn {
  margin-left: auto;
  padding: 3px 12px;
  color: var(--copper-soft);
  border: 1px solid rgba(168, 50, 42, 0.55);
  border-radius: 999px;
}
@media (max-width: 899px) { .footer-warn { margin-left: 0; } }

/* ---------- 7. 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(32px, 5vw, 64px); }
.section--tight { padding-block: clamp(18px, 3vw, 32px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 8px 20px;
  margin-bottom: clamp(18px, 3vw, 28px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-paper);
}
.section-head__index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--copper);
}

.grid { display: grid; gap: clamp(16px, 2.4vw, 26px); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(224px, 1fr)); }

.grid--editorial { display: grid; grid-template-columns: minmax(0, 1fr); gap: clamp(18px, 3vw, 32px); }
@media (min-width: 900px) {
  .grid--editorial { grid-template-columns: 88px minmax(0, 1fr); }
}
@media (min-width: 1120px) {
  .grid--editorial { grid-template-columns: 96px minmax(0, 7fr) minmax(0, 3fr); }
}

/* ---------- 8. 文字组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--copper);
}
.eyebrow::before { content: ""; width: 18px; height: 1px; background: var(--copper); }

.lede {
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.95;
  color: var(--body-text);
}

.prose { max-width: 70ch; }
.prose > * + * { margin-top: 1.05em; }
.prose p { line-height: 2; }
.prose h2 { margin-top: 1.8em; font-size: var(--fs-3); }
.prose h3 { margin-top: 1.4em; font-size: 19px; }
.prose ul, .prose ol { line-height: 2; padding-left: 1.3em; }
.prose ul { list-style: none; padding-left: 0; }
.prose ul > li { position: relative; padding-left: 18px; }
.prose ul > li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.85em;
  width: 6px; height: 6px;
  background: var(--copper);
  border-radius: 1px;
  transform: rotate(45deg);
}
.prose ol { list-style: decimal; }
.prose strong { color: var(--ink-800); }
.prose a {
  color: var(--ink-600);
  border-bottom: 1px solid var(--line-copper);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.prose a:hover { color: var(--copper); border-color: var(--copper); }

.link {
  position: relative;
  color: var(--ink-600);
  font-weight: 500;
  transition: color var(--dur) var(--ease);
}
.link::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 100%; height: 1px;
  background: var(--copper);
  transform: scaleX(0.32);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}
.link:hover { color: var(--copper); }
.link:hover::after { transform: scaleX(1); }

.note {
  padding: 14px 16px;
  font-size: var(--fs-5);
  line-height: 1.95;
  color: var(--body-text);
  background: rgba(237, 228, 210, 0.62);
  border-left: 3px solid var(--copper);
  border-top: 1px solid var(--line-paper);
  border-right: 1px solid var(--line-paper);
  border-bottom: 1px solid var(--line-paper);
}
.note__title {
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper);
}

.breadcrumb { padding-block: 12px; font-size: var(--fs-5); }
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 8px; }
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; color: var(--silver); }
.breadcrumb__item + .breadcrumb__item::before { content: "/"; color: rgba(192, 138, 62, 0.6); }
.breadcrumb__link {
  color: var(--ink-600);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.breadcrumb__link:hover { color: var(--copper); border-color: var(--copper); }
.breadcrumb__item[aria-current="page"] { color: var(--graphite); }

/* ---------- 9. 索引、图例与刻度 ---------- */
.year-rail {
  position: relative;
  padding-left: 14px;
  border-left: 1px solid var(--line-copper-soft);
}
.year-rail__item {
  position: relative;
  display: block;
  padding: 6px 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--silver);
  transition: color var(--dur) var(--ease);
}
.year-rail__item::before {
  content: "";
  position: absolute;
  left: -19px; top: 50%;
  width: 7px; height: 7px;
  margin-top: -3.5px;
  background: var(--ivory);
  border: 1px solid var(--line-copper);
  border-radius: 50%;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.year-rail__item:hover { color: var(--copper); }
.year-rail__item:hover::before { background: var(--copper); }
.year-rail__item[aria-current="true"] { color: var(--ink-800); font-weight: 700; }
.year-rail__item[aria-current="true"]::before { background: var(--copper); border-color: var(--copper); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  padding: 12px 16px;
  font-size: var(--fs-5);
  color: var(--body-text);
  background: rgba(237, 228, 210, 0.5);
  border: 1px solid var(--line-paper);
  border-left: 3px solid var(--copper);
}
.legend__item { display: inline-flex; align-items: center; gap: 8px; }
.legend__swatch { width: 10px; height: 10px; flex: none; border-radius: 2px; background: var(--copper); }
.legend__swatch--ink { background: var(--ink-800); }
.legend__swatch--paper { background: var(--paper); border: 1px solid var(--line-paper); }
.legend__swatch--cinnabar { background: var(--cinnabar); }

.rule {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-block: clamp(24px, 4vw, 48px);
}
.rule::before, .rule::after { content: ""; flex: 1; height: 1px; background: var(--line-paper); }
.rule__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--copper);
}

/* ---------- 10. 卡片、标签、按钮 ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--paper);
  border: 1px solid var(--line-copper-soft);
  box-shadow: var(--shadow-card);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.card::after {
  content: "";
  position: absolute;
  top: 8px; right: 8px;
  width: 14px; height: 14px;
  border-top: 1px solid var(--copper);
  border-right: 1px solid var(--copper);
  opacity: 0.55;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--copper);
  box-shadow: 0 18px 34px -24px rgba(11, 38, 32, 0.7);
}
.card:hover::after { opacity: 1; transform: translate(2px, -2px); }
.card__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--copper);
}
.card__title {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink-800);
}
.card__text { font-size: 15px; line-height: 1.95; color: var(--body-text); }
.card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding-top: 6px;
  font-size: var(--fs-5);
  color: var(--silver);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-600);
  background: rgba(246, 241, 228, 0.72);
  border: 1px solid var(--line-copper);
  border-radius: 999px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.tag:hover { transform: translateY(-2px); border-color: var(--copper); color: var(--copper); }
.tag[data-state="current"] { color: var(--cinnabar); border-color: rgba(168, 50, 42, 0.7); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  font-size: 14px;
  letter-spacing: 0.07em;
  color: var(--ink-800);
  background: var(--ivory);
  border: 1px solid var(--line-copper);
  border-radius: 999px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.btn:hover { transform: translateY(-2px); border-color: var(--copper); background: var(--paper); }
.btn--primary { color: var(--copper-soft); background: var(--ink-800); border-color: var(--ink-800); }
.btn--primary:hover { background: var(--ink-900); border-color: var(--copper); color: var(--ivory); }
.btn__num { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; color: var(--copper); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 13px;
  color: var(--graphite);
  background: var(--ivory);
  border: 1px solid var(--line-paper);
  border-radius: 999px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.chip:hover { transform: translateY(-2px); border-color: var(--copper); }
.chip[aria-pressed="true"],
.chip[aria-selected="true"] {
  color: var(--copper-soft);
  background: var(--ink-800);
  border-color: var(--ink-800);
}
.chip__count { font-family: var(--font-mono); font-size: 11px; color: var(--copper); }
.chip[aria-pressed="true"] .chip__count { color: var(--copper-soft); }

/* ---------- 11. 折叠文档 ---------- */
.fold {
  overflow: hidden;
  background: var(--ivory);
  border: 1px solid var(--line-paper);
  border-radius: 10px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.fold + .fold { margin-top: 10px; }
.fold[open] { border-color: var(--line-copper); background: rgba(237, 228, 210, 0.55); }
.fold__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-800);
  list-style: none;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.fold__summary::-webkit-details-marker { display: none; }
.fold__summary:hover { background: var(--paper); color: var(--ink-600); }
.fold__num { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.16em; color: var(--copper); }
.fold__arrow {
  margin-left: auto;
  width: 9px; height: 9px;
  border-right: 1.5px solid var(--copper);
  border-bottom: 1.5px solid var(--copper);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease);
}
.fold[open] .fold__arrow { transform: rotate(-135deg); }
.fold__body {
  padding: 2px 18px 18px;
  font-size: 15px;
  line-height: 2;
  color: var(--body-text);
}

/* ---------- 12. 图位容器（响应式，供页面阶段放图） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line-copper-soft);
  border-radius: 6px;
  background-color: var(--paper);
  background-image: repeating-linear-gradient(135deg, rgba(192, 138, 62, 0.16) 0 1px, transparent 1px 12px);
  box-shadow: var(--shadow-card);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame__stamp {
  position: absolute;
  top: 10px; left: 10px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--copper-soft);
  background: rgba(11, 38, 32, 0.86);
  border: 1px solid var(--line-copper);
  border-radius: 999px;
}
.media-frame__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 12px 14px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: 0.04em;
  color: var(--copper-soft);
  background: linear-gradient(to top, rgba(11, 38, 32, 0.94), rgba(11, 38, 32, 0));
}

/* ---------- 13. 显现（配合 data-reveal） ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}
[data-reveal="shown"] { opacity: 1; transform: none; }

/* ---------- 14. 无障碍与偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
}