/* =========================================================
   万博体育 · MANBETX 中文站点 — 共享样式 /assets/site.css
   1 Reset  2 变量  3 基础排版  4 工具  5 容器与栅格
   6 按钮  7 标签  8 卡片与面板  9 章节与数字  10 图片容器
   11 正文与面包屑  12 筛选控件  13 头部框架  14 页脚
   15 动效与降级
   ========================================================= */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, figure, blockquote { margin: 0; }

ul, ol { padding: 0; list-style: none; }

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

button, input, select, textarea { font: inherit; color: inherit; }

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #0B1B33;
  --ink-800: #12294A;
  --ink-700: #183562;
  --paper: #F2E9DA;
  --paper-2: #E8D9C0;
  --ink-dark: #221A14;
  --orange: #FF6A1F;
  --orange-soft: #FF8347;
  --green: #35D07F;
  --steel: #8FA0B5;
  --white: #FFFFFF;
  --rust: #C2481C;

  --line: rgba(143, 160, 181, .24);
  --line-strong: rgba(143, 160, 181, .45);
  --text: #DCE6F4;
  --text-dim: #C9D6E8;

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

  --rail-w: 264px;
  --topbar-h: 56px;
  --ticks-w: 26px;
  --radius: 2px;
  --shadow-paper: 0 6px 0 -2px var(--paper-2), 0 6px 0 -1px rgba(34, 26, 20, .55);
  --shadow-paper-hover: 0 9px 0 -2px var(--paper-2), 0 9px 0 -1px rgba(34, 26, 20, .55);
}

/* ---------- 3. 基础排版 ---------- */
body {
  margin: 0;
  padding-top: var(--topbar-h);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(rgba(143, 160, 181, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(143, 160, 181, .06) 1px, transparent 1px),
    radial-gradient(1100px 560px at 82% -8%, rgba(255, 106, 31, .12), transparent 62%),
    radial-gradient(900px 520px at -5% 100%, rgba(53, 208, 127, .08), transparent 60%);
  background-size: 84px 84px, 84px 84px, 100% 100%, 100% 100%;
  background-attachment: fixed, fixed, scroll, scroll;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.25;
  color: var(--white);
}

h1 { font-size: clamp(28px, 5vw, 40px); }
h2 { font-size: clamp(22px, 3.4vw, 32px); }
h3 { font-size: clamp(18px, 2.4vw, 22px); }

p { max-width: 72ch; }

#main-content { display: block; }

::selection { background: var(--orange); color: #1A0D05; }

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

/* ---------- 4. 工具 ---------- */
.label-mono {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--steel);
}

.text-orange { color: var(--orange); }
.text-green { color: var(--green); }

.visually-hidden {
  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: fixed;
  left: 12px;
  top: -80px;
  z-index: 200;
  padding: 12px 18px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  color: #1A0D05;
  background: var(--orange);
  border-radius: var(--radius);
  transition: top .18s ease;
}
.skip-link:focus { top: 12px; }

/* ---------- 5. 容器与栅格 ---------- */
.container {
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: 20px;
}
.container--wide { max-width: 1320px; }
.container--mid { max-width: 1040px; }
.container--narrow { max-width: 720px; }

.grid { display: grid; gap: 24px; grid-template-columns: 1fr; }
.grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }

@media (min-width: 720px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .grid--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
  .grid--asym { grid-template-columns: minmax(0, 8fr) minmax(0, 4fr); }
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  text-align: center;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}

.btn--primary {
  color: #1A0D05;
  background: var(--orange);
  border-color: var(--orange);
}
.btn--primary:hover { background: var(--orange-soft); border-color: var(--orange-soft); transform: translateY(-2px); }

.btn--ghost {
  color: var(--paper);
  background: transparent;
  border-color: var(--line-strong);
}
.btn--ghost:hover { color: var(--white); border-color: var(--orange); transform: translateY(-2px); }

.btn--paper {
  color: var(--ink-dark);
  background: var(--paper);
  border-color: rgba(34, 26, 20, .8);
  box-shadow: var(--shadow-paper);
}
.btn--paper:hover { transform: translateY(-2px); box-shadow: var(--shadow-paper-hover); }

.btn:active { transform: translateY(0); }

/* ---------- 7. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--steel);
  background: rgba(18, 41, 74, .6);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}
.tag--orange { color: var(--orange); border-color: rgba(255, 106, 31, .6); background: rgba(255, 106, 31, .1); }
.tag--green { color: var(--green); border-color: rgba(53, 208, 127, .5); background: rgba(53, 208, 127, .08); }

.status-dot {
  display: inline-block;
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  animation: status-pulse 2.4s ease-out infinite;
}

@keyframes status-pulse {
  0% { box-shadow: 0 0 0 0 rgba(53, 208, 127, .55); }
  70% { box-shadow: 0 0 0 8px rgba(53, 208, 127, 0); }
  100% { box-shadow: 0 0 0 0 rgba(53, 208, 127, 0); }
}

/* ---------- 8. 卡片与面板 ---------- */
.panel {
  padding: 22px;
  background: linear-gradient(180deg, rgba(18, 41, 74, .92), rgba(11, 27, 51, .94));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.panel:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: 0 14px 26px -20px rgba(0, 0, 0, .95);
}
.panel--accent { border-left: 3px solid var(--orange); }

.paper-card {
  padding: 24px;
  color: var(--ink-dark);
  background: var(--paper);
  border: 1px solid rgba(34, 26, 20, .85);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
  transition: transform .2s ease, box-shadow .2s ease;
}
.paper-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-paper-hover); }

.paper-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--ink-dark);
}

.paper-card__meta {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--rust);
}

/* ---------- 9. 章节与数字 ---------- */
.section { padding: 56px 0; }

@media (min-width: 1024px) {
  .section { padding: 76px 0; }
}

.section__head {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 16px;
  padding-bottom: 14px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--line);
}
.section__head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 64px;
  height: 2px;
  background: var(--orange);
}

.section__index {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--orange);
}

.section__title { margin: 0; }

.section__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  color: var(--steel);
}

.stat { display: flex; flex-direction: column; gap: 6px; }

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 64px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--orange);
}
.stat__value--green { color: var(--green); }
.stat__value--white { color: var(--white); }

.stat__unit {
  margin-left: 6px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--steel);
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--steel);
}

/* ---------- 10. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--ink-800);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--paper);
  background: linear-gradient(180deg, rgba(11, 27, 51, 0), rgba(11, 27, 51, .92));
}

/* ---------- 11. 正文与面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--steel);
}
.breadcrumbs a { color: var(--steel); border-bottom: 1px solid transparent; transition: color .18s ease, border-color .18s ease; }
.breadcrumbs a:hover { color: var(--orange); border-bottom-color: var(--orange); }
.breadcrumbs__sep { color: rgba(143, 160, 181, .5); }

.prose {
  max-width: 70ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
}
.prose h2 { margin: 1.6em 0 .6em; font-size: 22px; }
.prose h3 { margin: 1.4em 0 .5em; font-size: 18px; }
.prose p { margin: 0 0 1.05em; }
.prose ul { margin: 0 0 1.05em; padding-left: 1.2em; list-style: disc; }
.prose ol { margin: 0 0 1.05em; padding-left: 1.3em; list-style: decimal; }
.prose li { margin-bottom: .4em; }
.prose a { color: var(--orange); border-bottom: 1px solid rgba(255, 106, 31, .5); }
.prose a:hover { border-bottom-color: var(--orange); }

.prose--paper {
  max-width: 66ch;
  padding: 28px 26px;
  font-family: var(--font-serif);
  color: var(--ink-dark);
  background: var(--paper);
  border: 1px solid rgba(34, 26, 20, .8);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
}
.prose--paper h2,
.prose--paper h3 { color: var(--ink-dark); }
.prose--paper a { color: var(--rust); border-bottom-color: rgba(194, 72, 28, .5); }

/* ---------- 12. 筛选控件 ---------- */
.seg {
  display: inline-flex;
  flex-wrap: wrap;
  overflow: hidden;
  background: rgba(11, 27, 51, .6);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
}

.seg__btn {
  appearance: none;
  padding: 9px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--steel);
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line);
  cursor: pointer;
  transition: background-color .18s ease, color .18s ease;
}
.seg__btn:last-child { border-right: 0; }
.seg__btn:hover { color: var(--white); background: rgba(255, 106, 31, .14); }
.seg__btn[aria-pressed="true"] { color: #1A0D05; background: var(--orange); }

[data-filter-tag].is-filtered { display: none; }

/* ---------- 13. 头部框架 ---------- */
.site-header {
  position: relative;
  z-index: 80;
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  gap: 14px;
  height: var(--topbar-h);
  padding: 0 14px;
  background: rgba(9, 22, 42, .95);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.topbar__brand {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--paper);
  white-space: nowrap;
  text-overflow: ellipsis;
}

.data-strip {
  display: none;
  align-items: center;
  gap: 20px;
  margin: 0;
}

.data-strip__item {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
}

.data-strip__key { color: var(--steel); text-transform: uppercase; }
.data-strip__val { color: var(--green); }
.data-strip__item:nth-child(2) .data-strip__val { color: var(--orange); }
.data-strip__item:nth-child(3) .data-strip__val { color: var(--white); }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--paper);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color .18s ease, border-color .18s ease;
}
.nav-toggle:hover { color: var(--white); border-color: var(--orange); }
.nav-toggle[aria-expanded="true"] { color: var(--orange); border-color: var(--orange); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  box-shadow: 0 -5px 0 currentColor, 0 5px 0 currentColor;
}

.nav-toggle__text { line-height: 1; }

.nav-rail {
  position: fixed;
  top: var(--topbar-h);
  bottom: 0;
  left: 0;
  z-index: 92;
  display: flex;
  flex-direction: column;
  gap: 18px;
  width: min(84vw, 320px);
  padding: 20px 18px 28px;
  overflow-y: auto;
  background: linear-gradient(180deg, #0E2240 0%, #0A172B 100%);
  border-right: 1px solid var(--line);
  transform: translateX(-101%);
  transition: transform .26s ease;
}

.site-header[data-open] .nav-rail,
.nav-rail[data-open] { transform: translateX(0); }

.site-header[data-open]::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 88;
  background: rgba(5, 12, 24, .62);
}

.nav-rail__brand {
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.brand-mark { display: flex; flex-direction: column; gap: 5px; }

.brand-mark__name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--white);
}

.brand-mark__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--orange);
}

.nav-rail__tagline {
  max-width: none;
  padding-left: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
  border-left: 2px solid var(--orange);
}

.site-nav { display: flex; flex-direction: column; gap: 10px; }

.site-nav__label { margin: 0; }

.site-nav__list { display: flex; flex-direction: column; gap: 2px; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 10px 10px 8px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-dim);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease, padding-left .18s ease;
}
.nav-link:hover {
  padding-left: 12px;
  color: var(--white);
  background: rgba(255, 106, 31, .1);
  border-left-color: var(--orange);
}

.nav-link__index {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--steel);
}

.nav-link__text { flex: 1 1 auto; }

.nav-link[aria-current="page"] {
  color: var(--white);
  background: linear-gradient(90deg, rgba(255, 106, 31, .22), rgba(255, 106, 31, 0));
  border-left-color: var(--orange);
}
.nav-link[aria-current="page"] .nav-link__index { color: var(--green); }

.nav-rail__actions { display: flex; flex-direction: column; gap: 8px; }
.nav-rail__actions .btn { width: 100%; }

.nav-rail__meta {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-top: auto;
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  color: var(--steel);
  border-top: 1px dashed var(--line);
}
.nav-rail__meta .status-dot { margin-top: 6px; }

.rail-ticks { display: none; }

.scroll-progress {
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  right: 0;
  z-index: 95;
  height: 2px;
  background: rgba(143, 160, 181, .16);
  pointer-events: none;
}
.scroll-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--orange));
  transform: scaleX(0);
  transform-origin: 0 50%;
}

@media (min-width: 900px) {
  .data-strip { display: flex; margin-right: auto; }
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }

  .topbar { left: var(--rail-w); padding: 0 22px; }
  .topbar__brand { display: none; }
  .nav-toggle { display: none; }

  .nav-rail {
    top: 0;
    width: var(--rail-w);
    padding: 22px 20px 26px;
    transform: none;
    box-shadow: inset -1px 0 0 rgba(0, 0, 0, .45);
  }

  .site-header[data-open]::after { display: none; }

  .scroll-progress { left: var(--rail-w); }
}

@media (min-width: 1280px) {
  body { padding-right: var(--ticks-w); }

  .rail-ticks {
    display: block;
    position: fixed;
    top: var(--topbar-h);
    right: 0;
    bottom: 0;
    z-index: 70;
    width: var(--ticks-w);
    pointer-events: none;
    border-left: 1px solid var(--line);
    background-color: rgba(18, 41, 74, .45);
    background-image: repeating-linear-gradient(180deg, rgba(143, 160, 181, .38) 0 1px, transparent 1px 24px);
  }

  .scroll-progress { right: var(--ticks-w); }
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  margin-top: 72px;
  padding: 48px 0 28px;
  color: var(--text-dim);
  background: linear-gradient(180deg, #0A1729, #081221);
  border-top: 1px solid var(--line);
}

.footer-top {
  display: grid;
  gap: 28px;
  grid-template-columns: 1fr;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 900px) {
  .footer-top { grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 40px; }
}

.footer-brand__name {
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.2;
  color: var(--white);
}

.footer-summary {
  max-width: 46ch;
  margin-bottom: 18px;
  font-size: 14.5px;
  color: var(--steel);
}

.footer-stamp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--green);
  background: rgba(53, 208, 127, .08);
  border: 1px solid rgba(53, 208, 127, .45);
  border-radius: var(--radius);
}

.footer-featured {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

@media (min-width: 620px) {
  .footer-featured { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.footer-featured__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  color: var(--ink-dark);
  background: var(--paper);
  border: 1px solid rgba(34, 26, 20, .8);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
  transition: transform .2s ease, box-shadow .2s ease;
}
.footer-featured__card:hover { transform: translateY(-3px); box-shadow: var(--shadow-paper-hover); }

.footer-featured__label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--rust);
}

.footer-featured__title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.2;
}

.footer-featured__desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: #4A3B2C;
}

.footer-grid {
  display: grid;
  gap: 26px;
  grid-template-columns: 1fr;
  padding: 34px 0 26px;
}

@media (min-width: 640px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(0, 1.35fr); }
}

.footer-col { min-width: 0; }

.footer-col__title {
  margin: 0 0 14px;
  padding-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--orange);
  border-bottom: 1px solid var(--line);
}

.footer-links { display: flex; flex-direction: column; gap: 9px; }

.footer-links a {
  font-size: 14.5px;
  color: var(--text-dim);
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.footer-links a:hover { color: var(--white); border-bottom-color: var(--orange); }

.contact-list { display: flex; flex-direction: column; gap: 10px; }

.contact-list li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  font-size: 14px;
  line-height: 1.6;
}

.contact-list__key {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--steel);
}

.contact-list__val {
  min-width: 0;
  color: var(--text-dim);
  word-break: break-word;
}

.contact-list__note {
  margin-top: 12px;
  max-width: 40ch;
  font-size: 12.5px;
  color: var(--steel);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--steel);
  border-top: 1px solid var(--line);
}

.footer-legal, .footer-icp { margin: 0; }

/* ---------- 15. 显现与动效降级 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .5s ease, transform .5s ease;
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] { opacity: 1; transform: none; }

  .panel:hover,
  .paper-card:hover,
  .footer-featured__card:hover,
  .btn:hover { transform: none; }
}