/* ==========================================================================
   国米中文站内容中心 — 共享样式 /assets/site.css
   目录型内容地图：左右分置页头、连续画布分区、夜战蓝黑 + 电光蓝 + 暖金
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

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

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

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

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

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

address { font-style: normal; }

[hidden] { display: none !important; }

/* ---------- 2. Design tokens ---------- */
:root {
  --night: #05070E;
  --night-2: #0A1024;
  --inter-blue: #123A8C;
  --blue: #1E5BE0;
  --electric: #2E9BFF;
  --white: #F2F6FF;
  --mist: #8C97B2;
  --gold: #F2C14E;
  --cyan: #7FD8FF;
  --ink: #0B0B0F;

  --line: rgba(127, 216, 255, .16);
  --line-strong: rgba(127, 216, 255, .34);
  --panel: rgba(10, 16, 36, .72);
  --panel-soft: rgba(10, 16, 36, .45);

  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --ease: cubic-bezier(.22, 1, .36, 1);
  --shell: 1440px;
  --read: 1200px;
  --gutter: clamp(16px, 3.4vw, 44px);
  --radius: 4px;
  --header-h: 72px;
}

/* ---------- 3. 基础排版（中文） ---------- */
body {
  position: relative;
  min-height: 100vh;
  background: var(--night);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 球场夜底：径向光斑 + 战术网点 + 极慢颗粒位移 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background:
    radial-gradient(120% 80% at 78% -12%, rgba(18, 58, 140, .58) 0%, rgba(18, 58, 140, 0) 62%),
    radial-gradient(90% 65% at -8% 104%, rgba(30, 91, 224, .22) 0%, rgba(30, 91, 224, 0) 60%),
    var(--night);
}

body::after {
  content: "";
  position: fixed;
  inset: -60%;
  z-index: -1;
  pointer-events: none;
  opacity: .5;
  background-image:
    repeating-linear-gradient(0deg, rgba(127, 216, 255, .045) 0 1px, rgba(0, 0, 0, 0) 1px 3px),
    repeating-linear-gradient(90deg, rgba(127, 216, 255, .03) 0 1px, rgba(0, 0, 0, 0) 1px 96px);
  animation: grain-drift 42s linear infinite;
}

@keyframes grain-drift {
  from { transform: translate3d(0, 0, 0); }
  to { transform: translate3d(-2%, -3%, 0); }
}

p { max-width: 68ch; }

::selection { background: rgba(242, 193, 78, .85); color: var(--ink); }

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

/* ---------- 4. 通用版式 ---------- */
.container {
  width: min(var(--read), 100%);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--wide {
  width: min(var(--shell), 100%);
}

.section {
  position: relative;
  padding-block: clamp(48px, 7vw, 104px);
}

.section--alt {
  background: linear-gradient(180deg, rgba(10, 16, 36, 0) 0%, var(--night-2) 14%, var(--night-2) 86%, rgba(10, 16, 36, 0) 100%);
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 20px;
  margin-bottom: clamp(20px, 3vw, 36px);
}

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

.section__title {
  font-size: clamp(1.5rem, 3.2vw, 2.4rem);
  font-weight: 700;
  font-style: italic;
  letter-spacing: -.01em;
  line-height: 1.2;
}

.section__lede {
  flex: 1 1 320px;
  min-width: 0;
  color: var(--mist);
  font-size: 16px;
}

.display {
  font-size: clamp(3.2rem, 9vw, 7.5rem);
  font-weight: 200;
  font-style: italic;
  letter-spacing: -.03em;
  line-height: .96;
}

.lede {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  color: var(--mist);
  line-height: 1.8;
}

.meta {
  font-size: 14px;
  color: var(--mist);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
}

.index-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cyan);
}

.hairline {
  height: 1px;
  width: 100%;
  border: 0;
  background: linear-gradient(90deg, rgba(127, 216, 255, 0), var(--line-strong), rgba(127, 216, 255, 0));
}

.stack {
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2vw, 24px);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 30px);
}

.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: 980px) {
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 5. 按钮 / 标签 / 卡片 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.2;
  transition: background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
}

.btn--primary {
  background: var(--blue);
  color: #fff;
  box-shadow: 0 10px 26px -14px rgba(30, 91, 224, 1);
}

.btn--primary:hover {
  background: var(--electric);
  transform: translateY(-2px);
}

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--white);
  background: rgba(30, 91, 224, .06);
}

.btn--ghost:hover {
  border-color: var(--cyan);
  background: rgba(127, 216, 255, .1);
  transform: translateY(-2px);
}

.btn--gold {
  background: var(--gold);
  color: var(--ink);
}

.btn--gold:hover {
  background: #ffd873;
  transform: translateY(-2px);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border: 1px solid rgba(127, 216, 255, .26);
  border-radius: 999px;
  background: var(--panel-soft);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  white-space: nowrap;
}

.chip--gold {
  color: var(--gold);
  border-color: rgba(242, 193, 78, .5);
}

.chip--blue {
  color: var(--cyan);
  border-color: rgba(46, 155, 255, .5);
}

.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(10, 16, 36, .86) 0%, rgba(5, 7, 14, .48) 100%);
  transition: border-color .22s var(--ease), transform .22s var(--ease), box-shadow .22s var(--ease);
}

.card:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: 0 22px 44px -30px rgba(46, 155, 255, .8);
}

.card--tilt {
  transform: rotate(3deg);
}

.card--tilt:hover {
  transform: rotate(3deg) translateY(-3px);
}

.star {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(242, 193, 78, .38);
  border-radius: 50%;
  background: rgba(11, 11, 15, .72);
  color: var(--gold);
  font-size: 15px;
  line-height: 1;
  transition: background-color .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}

.star:hover { transform: scale(1.08); }

.star[aria-pressed="true"] {
  background: var(--gold);
  color: var(--ink);
  border-color: var(--gold);
}

/* ---------- 6. 面包屑 ---------- */
.breadcrumb {
  padding-block: 16px 0;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb__item:not(:last-child)::after {
  content: "/";
  color: rgba(127, 216, 255, .4);
}

.breadcrumb__item[aria-current="page"] { color: var(--white); }

.breadcrumb__link { color: var(--mist); transition: color .2s var(--ease); }

.breadcrumb__link:hover { color: var(--cyan); }

/* ---------- 7. 图片容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(90% 120% at 12% 0%, rgba(18, 58, 140, .75) 0%, rgba(5, 7, 14, 0) 62%),
    linear-gradient(135deg, var(--night-2) 0%, #060A16 100%);
}

.media__img {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06);
}

.media--wide .media__img { aspect-ratio: 21 / 9; }

.media__frame {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(118deg, rgba(0, 0, 0, 0) 49.5%, rgba(127, 216, 255, .2) 49.5%, rgba(127, 216, 255, .2) 50.2%, rgba(0, 0, 0, 0) 50.2%),
    linear-gradient(0deg, rgba(5, 7, 14, .72) 0%, rgba(5, 7, 14, 0) 46%);
}

.media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist);
}

.media--tilt { transform: rotate(-3deg); }

/* ---------- 8. 筛选 / 展开 / 索引带 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-block: 16px;
  border-block: 1px solid var(--line);
}

.filter-btn {
  padding: 8px 15px;
  border: 1px solid rgba(127, 216, 255, .24);
  border-radius: 999px;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.filter-btn:hover {
  color: var(--white);
  border-color: var(--cyan);
}

.filter-btn[aria-pressed="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink);
}

.disclosure {
  padding-block: 14px;
  border-top: 1px solid var(--line);
}

.disclosure > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  letter-spacing: .01em;
}

.disclosure > summary::-webkit-details-marker { display: none; }

.disclosure > summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cyan);
}

.disclosure[open] > summary::after { content: "–"; }

.disclosure__body {
  padding-top: 10px;
  color: var(--mist);
  font-size: 16px;
}

.index-rail {
  position: sticky;
  top: 96px;
  align-self: start;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.index-rail__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.index-rail__link {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
  transition: color .2s var(--ease), transform .2s var(--ease);
}

.index-rail__link:hover {
  color: var(--white);
  transform: translateX(2px);
}

.index-rail__link.is-active {
  color: var(--gold);
}

@media (max-width: 900px) {
  .index-rail {
    position: static;
    border-left: 0;
    border-bottom: 1px solid var(--line);
    padding: 0 0 14px;
  }
  .index-rail__list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 12px;
  }
}

/* ---------- 9. 头部 ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--gold);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: top .2s var(--ease);
}

.skip-link:focus {
  top: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(5, 7, 14, .88);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  position: relative;
  width: min(var(--shell), 100%);
  margin-inline: auto;
  padding: 12px var(--gutter);
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 48px);
}

.brand { flex: 0 0 auto; }

.brand__link {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand__mark {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(127, 216, 255, .5);
  background: linear-gradient(115deg, var(--inter-blue) 0 48%, var(--ink) 48% 100%);
  transform: skewX(-9deg);
  box-shadow: 0 0 18px -2px rgba(30, 91, 224, .75);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand__name {
  font-size: 15px;
  font-weight: 700;
  font-style: italic;
  letter-spacing: -.01em;
  color: var(--white);
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 26px);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
}

.site-nav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 12px;
  border: 1px solid transparent;
  border-radius: 3px;
  transition: background-color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease);
}

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--cyan);
  opacity: .7;
}

.site-nav__label {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--white);
}

.site-nav__link:hover {
  background: rgba(30, 91, 224, .16);
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.site-nav__link[aria-current="page"] {
  border-color: rgba(242, 193, 78, .5);
  background: linear-gradient(180deg, rgba(30, 91, 224, .26) 0%, rgba(30, 91, 224, 0) 100%);
}

.site-nav__link[aria-current="page"] .site-nav__index {
  color: var(--gold);
  opacity: 1;
}

.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 1px;
  background: var(--gold);
}

.site-nav__quick {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: clamp(10px, 1.8vw, 22px);
  border-left: 1px solid var(--line);
}

.quick-link {
  padding: 6px 11px;
  border: 1px solid rgba(127, 216, 255, .24);
  border-radius: 999px;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.quick-link:hover {
  color: var(--white);
  border-color: var(--cyan);
  background: rgba(127, 216, 255, .08);
}

.quick-link--gold {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink);
  font-weight: 700;
}

.quick-link--gold:hover {
  background: #ffd873;
  border-color: #ffd873;
  color: var(--ink);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  color: var(--white);
  background: rgba(10, 16, 36, .6);
}

.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 1px;
  background: var(--cyan);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:first-child {
  transform: translateY(2.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:last-child {
  transform: translateY(-2.5px) rotate(-45deg);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  background: rgba(127, 216, 255, .12);
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--blue) 0%, var(--cyan) 62%, var(--gold) 100%);
}

@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px var(--gutter) 24px;
    background: linear-gradient(180deg, rgba(10, 16, 36, .99) 0%, rgba(5, 7, 14, .99) 100%);
    border-bottom: 1px solid var(--line-strong);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s var(--ease);
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__link {
    flex-direction: row;
    align-items: baseline;
    gap: 14px;
    padding: 14px 4px;
    border: 0;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
  }

  .site-nav__link:hover {
    transform: none;
    background: rgba(30, 91, 224, .14);
  }

  .site-nav__link[aria-current="page"] {
    background: rgba(30, 91, 224, .18);
    border-left: 2px solid var(--gold);
    padding-left: 12px;
  }

  .site-nav__link[aria-current="page"]::after { display: none; }

  .site-nav__label { font-size: 16px; }

  .site-nav__quick {
    flex-wrap: wrap;
    padding-left: 0;
    padding-top: 18px;
    border-left: 0;
  }
}

@media (max-width: 520px) {
  .brand__sub { display: none; }
  .site-header__inner { padding-block: 10px; }
}

/* ---------- 10. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 10vw, 140px);
  background: linear-gradient(180deg, rgba(10, 16, 36, 0) 0%, var(--night-2) 24%, rgba(5, 7, 14, 1) 100%);
  border-top: 1px solid var(--line);
}

.site-footer__inner {
  width: min(var(--shell), 100%);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 76px) var(--gutter) clamp(24px, 3vw, 36px);
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(0, 1.9fr) minmax(240px, 1.1fr);
  gap: clamp(24px, 4vw, 60px);
}

.footer-brand__name {
  font-size: clamp(22px, 2.4vw, 32px);
  font-weight: 200;
  font-style: italic;
  letter-spacing: -.02em;
  line-height: 1.2;
}

.footer-brand__line {
  margin-top: 12px;
  max-width: 30ch;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.7;
}

.footer-brand__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.footer-brand__stats .mono {
  color: var(--cyan);
  font-size: 15px;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 36px);
}

.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .14em;
  color: var(--cyan);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link {
  color: var(--mist);
  font-size: 15px;
  transition: color .2s var(--ease);
}

.footer-link:hover { color: var(--white); }

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-left: clamp(0px, 2vw, 24px);
  border-left: 1px solid var(--line);
}

.footer-contact__row {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--energy, var(--cyan));
}

.footer-contact__value {
  color: var(--white);
  font-size: 14px;
  line-height: 1.6;
  word-break: break-word;
}

.footer-note {
  color: var(--mist);
  font-size: 13px;
  line-height: 1.7;
}

.site-footer__bottom {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px clamp(16px, 3vw, 34px);
  margin-top: clamp(20px, 3vw, 34px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.footer-bottom__line {
  flex: 1 1 300px;
  color: var(--mist);
  font-size: 13px;
}

.footer-bottom__icp,
.footer-bottom__copy {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.to-top {
  margin-left: auto;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.to-top:hover {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

@media (max-width: 1100px) {
  .site-footer__inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); }
  .footer-contact {
    grid-column: 1 / -1;
    padding-left: 0;
    padding-top: 20px;
    border-left: 0;
    border-top: 1px solid var(--line);
    flex-direction: row;
    flex-wrap: wrap;
    gap: 12px 40px;
  }
  .footer-note { flex: 1 1 100%; }
}

@media (max-width: 720px) {
  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-contact { flex-direction: column; }
  .to-top { margin-left: 0; }
}

@media (max-width: 420px) {
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 11. 滚动显现 ---------- */
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity .6s var(--ease),
    transform .6s var(--ease),
    letter-spacing .9s var(--ease);
}

html.has-js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

html.has-js .display[data-reveal] { letter-spacing: -.03em; }

html.has-js .display[data-reveal].is-in { letter-spacing: -.01em; }

/* ---------- 12. 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  body::after { animation: none; }

  html.has-js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  html.has-js .display[data-reveal] { letter-spacing: -.01em; }

  .site-nav__link:hover,
  .btn:hover,
  .card:hover,
  .index-rail__link:hover { transform: none; }
}