/* =========================================================
   金宝博主页 — /assets/site.css
   共享外壳：命令栏头部 + 批次索引页脚 + 通用组件
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #0E2A25;
  --ink-2: #143A32;
  --ink-3: #0A1614;
  --gold: #C8A65A;
  --gold-hi: #E8D49A;
  --paper: #F5F1E8;
  --paper-2: #EDE6D6;
  --mist: #8FA6A0;
  --bronze: #A9743F;
  --signal: #4E8F7B;

  --ff-head: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --ff-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", sans-serif;
  --ff-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Mono", Consolas, "Courier New", monospace;

  --wrap: 1240px;
  --gut: clamp(16px, 4vw, 40px);
  --hdr-h: 64px;

  --shadow-1: 0 1px 0 rgba(200, 166, 90, 0.16), 0 20px 44px -30px rgba(0, 0, 0, 0.95);
  --shadow-2: 6px 6px 0 rgba(10, 22, 20, 0.9);

  --gold-line: linear-gradient(90deg,
      rgba(200, 166, 90, 0) 0%,
      rgba(200, 166, 90, 0.85) 18%,
      rgba(232, 212, 154, 0.95) 50%,
      rgba(200, 166, 90, 0.85) 82%,
      rgba(200, 166, 90, 0) 100%);

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --t-fast: 160ms;
  --t-mid: 220ms;
}

@media (max-width: 899px) {
  :root { --hdr-h: 58px; }
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--hdr-h) + 16px);
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--ff-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.is-nav-open { overflow: hidden; }

img, svg, picture, video { display: block; max-width: 100%; }
img { height: auto; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5, h6, p, figure, blockquote { margin: 0; }

::selection { background: var(--gold); color: var(--ink-3); }

:focus-visible {
  outline: 2px solid var(--gold-hi);
  outline-offset: 2px;
  border-radius: 1px;
}

/* ---------- 3. 中文排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--ff-head);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2rem, 5.2vw, 3rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3.6vw, 2rem); }
h3 { font-size: clamp(1.25rem, 2.6vw, 1.5rem); }
h4 { font-size: 1.0625rem; }

.prose {
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.86);
}
.prose p + p { margin-top: 1.05em; }
.prose h2 { margin-top: 2em; margin-bottom: 0.7em; }
.prose h3 { margin-top: 1.6em; margin-bottom: 0.6em; }
.prose ul, .prose ol { margin: 1em 0; padding-left: 1.2em; list-style: disc; }
.prose li + li { margin-top: 0.5em; }
.prose strong { color: var(--gold-hi); font-weight: 600; }
.prose a { color: var(--gold); border-bottom: 1px solid rgba(200, 166, 90, 0.5); }
.prose a:hover { color: var(--gold-hi); border-bottom-color: var(--gold-hi); }

@media (max-width: 899px) {
  body { font-size: 16px; }
  .prose { font-size: 16px; }
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--gold);
  color: var(--ink-3);
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  transition: top var(--t-fast) var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 5. 头部 · 命令栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--ink);
}

.cmd-bar {
  position: relative;
  background: linear-gradient(180deg, #12312B 0%, #0E2A25 100%);
}
.cmd-bar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--gold-line);
  opacity: 0.6;
  pointer-events: none;
  z-index: 2;
}

.cmd-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gut);
  min-height: var(--hdr-h);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(12px, 2.4vw, 28px);
  transition: min-height var(--t-mid) var(--ease);
}

.cmd-lead {
  display: flex;
  align-items: center;
  min-width: 0;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.brand-seal {
  flex: none;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  font-family: var(--ff-head);
  font-weight: 900;
  font-size: 16px;
  line-height: 1;
  color: var(--ink-3);
  background: linear-gradient(140deg, var(--gold-hi), var(--gold) 55%, var(--bronze));
  box-shadow: 0 0 0 1px rgba(232, 212, 154, 0.45);
}
.brand-body {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  min-width: 0;
}
.brand-name {
  font-family: var(--ff-head);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--paper);
  white-space: nowrap;
}
.brand-sub {
  font-family: var(--ff-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
}

.cmd-coord {
  margin-left: 14px;
  padding-left: 14px;
  border-left: 1px solid rgba(143, 166, 160, 0.35);
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
  white-space: nowrap;
  transition: opacity var(--t-fast) var(--ease);
}

/* 导航 */
.cmd-nav { min-width: 0; }
.cmd-nav-list {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2px;
}
.cmd-nav-list a {
  display: block;
  padding: 7px 12px;
  font-size: 14px;
  line-height: 1.4;
  color: rgba(245, 241, 232, 0.72);
  border: 1px solid transparent;
  white-space: nowrap;
  transition: color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease);
}
.cmd-nav-list a:hover {
  color: var(--gold-hi);
  border-color: rgba(200, 166, 90, 0.45);
  background: rgba(200, 166, 90, 0.07);
}
.cmd-nav-list a[aria-current="page"] {
  color: var(--gold-hi);
  border-color: var(--gold);
  background: rgba(200, 166, 90, 0.12);
  box-shadow: inset 0 -2px 0 var(--gold);
}

/* 尾部 */
.cmd-tail {
  display: flex;
  align-items: center;
  gap: 12px;
}
.cmd-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--mist);
  white-space: nowrap;
  transition: opacity var(--t-fast) var(--ease);
}
.status-dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(78, 143, 123, 0.22);
}
.cmd-search {
  font-family: var(--ff-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  padding: 5px 12px;
  border: 1px solid var(--gold-hi);
  background: linear-gradient(140deg, var(--gold-hi), var(--gold) 60%, var(--bronze));
  transition: filter var(--t-fast) var(--ease);
}
.cmd-search:hover { filter: brightness(1.12); }

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 7px 11px;
  border: 1px solid rgba(200, 166, 90, 0.5);
  color: var(--gold-hi);
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  transition: border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}
.nav-toggle:hover { border-color: var(--gold); background: rgba(200, 166, 90, 0.1); }
.nav-toggle-box {
  display: grid;
  gap: 3px;
  width: 16px;
}
.nav-toggle-box span {
  display: block;
  height: 1px;
  background: var(--gold);
  transition: opacity var(--t-fast) var(--ease);
}
.site-header[data-open="true"] .nav-toggle-box span:nth-child(2) { opacity: 0.25; }

/* 进度轨 */
.scroll-rail {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(143, 166, 160, 0.14);
  overflow: hidden;
  pointer-events: none;
  z-index: 3;
}
.scroll-rail-fill {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--bronze), var(--gold) 55%, var(--gold-hi));
}

/* 桌面滚动收紧 */
@media (min-width: 900px) {
  .site-header[data-scrolled="true"] .cmd-inner { min-height: 52px; }
  .site-header[data-scrolled="true"] .cmd-coord,
  .site-header[data-scrolled="true"] .cmd-status {
    opacity: 0;
    visibility: hidden;
  }
}

/* 中等桌面压缩导航 */
@media (min-width: 900px) and (max-width: 1180px) {
  .cmd-nav-list a { padding: 6px 8px; font-size: 13px; }
  .cmd-coord { display: none; }
}

/* 移动端导航面板 */
@media (max-width: 899px) {
  .cmd-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 10px;
  }
  .cmd-coord,
  .cmd-status,
  .cmd-search { display: none; }
  .nav-toggle { display: inline-flex; }

  .cmd-nav {
    position: fixed;
    top: var(--hdr-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 95;
    background: var(--ink-3);
    padding: 20px var(--gut) 40px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity var(--t-mid) var(--ease),
                transform var(--t-mid) var(--ease),
                visibility var(--t-mid) linear;
  }
  .site-header[data-open="true"] .cmd-nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .cmd-nav-list {
    display: block;
    border-top: 1px solid rgba(200, 166, 90, 0.24);
  }
  .cmd-nav-list li { border-bottom: 1px solid rgba(200, 166, 90, 0.24); }
  .cmd-nav-list a {
    padding: 16px 4px;
    font-family: var(--ff-head);
    font-size: 20px;
    font-weight: 700;
    border: 0;
    background: none;
    box-shadow: none;
  }
  .cmd-nav-list a:hover { background: rgba(200, 166, 90, 0.06); }
  .cmd-nav-list a[aria-current="page"] {
    color: var(--gold-hi);
    background: rgba(200, 166, 90, 0.1);
    padding-left: 12px;
    box-shadow: inset 3px 0 0 var(--gold);
  }
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  background: var(--ink-3);
  color: var(--paper);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gold-line);
  opacity: 0.7;
}

.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 76px) var(--gut) 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.25fr 0.9fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.f-brand { display: flex; flex-direction: column; }
.brand--footer .brand-seal { width: 34px; height: 34px; font-size: 18px; }
.brand--footer .brand-name { font-size: 19px; }

.f-note {
  margin-top: 16px;
  max-width: 22em;
  padding-left: 12px;
  border-left: 2px solid rgba(200, 166, 90, 0.45);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 241, 232, 0.64);
}

.f-head {
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(200, 166, 90, 0.25);
  font-family: var(--ff-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.f-list li + li { margin-top: 9px; }
.f-list a {
  font-size: 14px;
  color: rgba(245, 241, 232, 0.74);
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}
.f-list a:hover {
  color: var(--gold-hi);
  padding-left: 4px;
}

.f-list--meta li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(245, 241, 232, 0.72);
}
.f-key {
  flex: none;
  width: 2.8em;
  font-family: var(--ff-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.footer-base {
  margin-top: clamp(32px, 5vw, 56px);
  padding: 20px 0 30px;
  border-top: 1px solid rgba(143, 166, 160, 0.18);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-align: center;
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.footer-copy { margin: 0; }
.footer-icp { margin: 0; color: rgba(200, 166, 90, 0.78); }

@media (max-width: 1023px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 599px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .f-note { max-width: none; }
}

/* ---------- 7. 容器与分区 ---------- */
main { display: block; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gut);
}
.wrap--narrow { max-width: 820px; }

.section { padding: clamp(36px, 6vw, 84px) 0; }
.section--tight { padding: clamp(22px, 3.4vw, 48px) 0; }

.rule {
  height: 1px;
  border: 0;
  margin: clamp(28px, 4vw, 52px) 0;
  background: var(--gold-line);
  opacity: 0.5;
}

/* ---------- 8. 通用文字组件 ---------- */
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--ff-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}
.kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--gold);
  flex: none;
}

.figure {
  display: block;
  font-family: var(--ff-mono);
  font-weight: 500;
  font-size: clamp(2.5rem, 7vw, 4.25rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--gold);
}

/* ---------- 9. 按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  font-family: var(--ff-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold-hi);
  background: transparent;
  border: 1px solid var(--gold);
  transition: color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease),
              box-shadow var(--t-fast) var(--ease),
              transform var(--t-fast) var(--ease);
}
.btn:hover {
  background: rgba(200, 166, 90, 0.12);
  border-color: var(--gold-hi);
  box-shadow: 0 0 0 1px rgba(200, 166, 90, 0.32), 0 0 22px -8px rgba(200, 166, 90, 0.8);
}
.btn:active { transform: translateY(1px); }

.btn--solid {
  color: var(--ink-3);
  border-color: var(--gold-hi);
  background: linear-gradient(140deg, var(--gold-hi), var(--gold) 58%, var(--bronze));
}
.btn--solid:hover {
  filter: brightness(1.08);
  background: linear-gradient(140deg, var(--gold-hi), var(--gold) 58%, var(--bronze));
}

.btn--ghost {
  color: rgba(245, 241, 232, 0.85);
  border-color: rgba(143, 166, 160, 0.5);
}
.btn--ghost:hover {
  color: var(--gold-hi);
  border-color: var(--gold);
  background: rgba(200, 166, 90, 0.08);
  box-shadow: none;
}

/* ---------- 10. 面包屑 ---------- */
.crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0;
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
}
.crumb a { color: rgba(245, 241, 232, 0.7); transition: color var(--t-fast) var(--ease); }
.crumb a:hover { color: var(--gold-hi); }
.crumb-sep { color: rgba(200, 166, 90, 0.55); }
.crumb [aria-current="page"] { color: var(--gold); }

/* ---------- 11. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(14px, 2.2vw, 24px);
}
.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)); }

@media (max-width: 899px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 599px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 12. 面板 / 卡片 ---------- */
.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--ink-2);
  border: 1px solid rgba(200, 166, 90, 0.28);
  box-shadow: var(--shadow-1);
}
.panel--paper {
  background: var(--paper);
  color: var(--ink);
  border-color: rgba(10, 22, 20, 0.18);
}
.panel--paper .kicker { color: var(--bronze); }
.panel--raised { box-shadow: var(--shadow-2); }
.panel--line::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gold-line);
}

/* ---------- 13. 非对称分栏 ---------- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 38fr) minmax(0, 62fr);
  gap: clamp(20px, 4vw, 56px);
  align-items: start;
}
.split--reverse { grid-template-columns: minmax(0, 62fr) minmax(0, 38fr); }

@media (max-width: 899px) {
  .split, .split--reverse { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 14. 图例 ---------- */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-family: var(--ff-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.legend-swatch {
  flex: none;
  width: 10px;
  height: 10px;
  border: 1px solid rgba(200, 166, 90, 0.6);
}
.legend-swatch--gold { background: var(--gold); }
.legend-swatch--paper { background: var(--paper); }
.legend-swatch--signal { background: var(--signal); border-color: rgba(78, 143, 123, 0.7); }

/* ---------- 15. 索引列表 ---------- */
.index-list {
  border-top: 1px solid rgba(143, 166, 160, 0.2);
}
.index-list > li {
  border-bottom: 1px solid rgba(143, 166, 160, 0.2);
}
.index-list a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  color: rgba(245, 241, 232, 0.82);
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}
.index-list a:hover {
  color: var(--gold-hi);
  padding-left: 6px;
}
.index-list .idx {
  flex: none;
  font-family: var(--ff-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

/* ---------- 16. 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid rgba(200, 166, 90, 0.3);
  background-color: var(--ink-2);
  background-image:
    repeating-linear-gradient(135deg, rgba(200, 166, 90, 0.08) 0 1px, transparent 1px 9px),
    linear-gradient(160deg, var(--ink-2) 0%, var(--ink-3) 100%);
}
.media > img,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media::after {
  content: attr(data-media-label);
  position: absolute;
  left: 12px;
  bottom: 10px;
  font-family: var(--ff-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: rgba(200, 166, 90, 0.82);
  pointer-events: none;
}
.media:not([data-media-label])::after { content: none; }

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }

@supports not (aspect-ratio: 1 / 1) {
  .media--16x9, .media--4x3, .media--1x1, .media--wide { min-height: 200px; }
}

/* ---------- 17. 粘性锚点 ---------- */
.anchors {
  position: sticky;
  top: calc(var(--hdr-h) + 18px);
  align-self: start;
  max-height: calc(100vh - var(--hdr-h) - 40px);
  overflow-y: auto;
}
.anchors a {
  display: block;
  padding: 8px 0 8px 12px;
  border-left: 1px solid rgba(143, 166, 160, 0.28);
  font-size: 13.5px;
  line-height: 1.5;
  color: rgba(245, 241, 232, 0.6);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.anchors a:hover { color: var(--gold-hi); }
.anchors a[aria-current="true"] {
  color: var(--gold-hi);
  border-left-color: var(--gold);
  border-left-width: 2px;
  padding-left: 11px;
}

@media (max-width: 1023px) {
  .anchors {
    position: static;
    max-height: none;
    overflow: visible;
  }
}

/* ---------- 18. 动效与降级 ---------- */
@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;
    scroll-behavior: auto !important;
  }
  .btn:active { transform: none; }
}