/* ==========================================================================
   LEYU 体育 · 共享样式表 /assets/site.css
   深空蓝夜赛场 + 电光青数据流光 + 橙红行动点
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
  scroll-behavior: smooth;
}

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

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

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

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

button { background: none; border: 0; cursor: pointer; }

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

hr { border: 0; }

/* ── 2. 设计变量 ────────────────────────────────────────────────────── */
:root {
  --ink: #050B1A;
  --ink-2: #141B3D;
  --teal: #06323A;
  --wine: #4A0F2A;
  --cyan: #22E6E0;
  --cyan-soft: #9FF7F2;
  --ember: #FF4B2B;
  --text: #E9F1FF;
  --muted: #93A6C9;
  --paper: #F4F7FF;

  --line: rgba(159, 247, 242, .16);
  --line-strong: rgba(159, 247, 242, .42);
  --line-soft: rgba(159, 247, 242, .09);

  --font-display: "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --shell: min(1240px, 100% - 2.5rem);
  --radius: 16px;
  --radius-pill: 999px;
  --shadow-card: 0 22px 46px -30px rgba(0, 0, 0, .95);
  --header-h: 72px;
}

/* ── 3. 基础排版 ────────────────────────────────────────────────────── */
body {
  position: relative;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  font-size: clamp(16px, .5vw + 14.7px, 17.5px);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 全站数据网格底纹 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(34, 230, 224, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 230, 224, .045) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 78% at 50% 0%, #000 0%, transparent 78%);
  mask-image: radial-gradient(120% 78% at 50% 0%, #000 0%, transparent 78%);
}

#main-content {
  position: relative;
  z-index: 2;
  display: block;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--paper);
}

h1 { font-weight: 900; letter-spacing: -.028em; }

p { max-width: 68ch; }

strong { color: var(--paper); font-weight: 700; }

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

/* ── 4. 排版工具类 ──────────────────────────────────────────────────── */
.display {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 7vw, 6.5rem);
  line-height: .95;
  letter-spacing: -.03em;
  color: var(--paper);
}

.display--sm {
  font-size: clamp(1.9rem, 4.2vw, 3.2rem);
  line-height: 1.02;
  letter-spacing: -.025em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  flex: none;
  background: var(--cyan);
  opacity: .85;
}

.lede {
  font-size: clamp(1.02rem, 1.1vw, 1.2rem);
  line-height: 1.72;
  color: #C6D4EC;
  max-width: 46ch;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
}

.muted { color: var(--muted); }
.accent { color: var(--cyan); }
.ember { color: var(--ember); }

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

/* ── 5. 布局容器与网格 ──────────────────────────────────────────────── */
.shell {
  width: var(--shell);
  margin-inline: auto;
}

.shell--narrow { width: min(820px, 100% - 2.5rem); }

.section {
  position: relative;
  padding-block: clamp(3.5rem, 7vw, 6.5rem);
}

.stack { display: grid; gap: var(--stack, 1rem); }

.grid {
  display: grid;
  gap: clamp(1.25rem, 2.4vw, 2.25rem);
}

.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)); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 3.25rem);
  align-items: start;
}

.editorial {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 2fr) minmax(0, 5fr);
  gap: clamp(1rem, 2vw, 2rem);
  align-items: start;
}

@media (max-width: 1040px) {
  .editorial { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .split { grid-template-columns: minmax(0, 1fr); }
  .editorial { grid-template-columns: minmax(0, 1fr); }
}

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

/* ── 6. 卡片与材质 ──────────────────────────────────────────────────── */
.card {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 2vw, 1.9rem);
  box-shadow: var(--shadow-card);
  transition: transform .22s ease, border-color .22s ease, box-shadow .22s ease;
}

@media (hover: hover) {
  .card:hover {
    transform: translateY(-4px);
    border-color: var(--line-strong);
    box-shadow: 0 30px 56px -30px rgba(0, 0, 0, .95);
  }
}

.card--indigo { background: linear-gradient(160deg, #141B3D 0%, #0A1130 100%); }
.card--teal { background: linear-gradient(160deg, #06323A 0%, #08243A 100%); }
.card--wine { background: linear-gradient(160deg, #4A0F2A 0%, #260A1F 100%); }
.card--paper {
  background: var(--paper);
  color: #0A1226;
  border-color: rgba(5, 11, 26, .22);
}
.card--paper h2,
.card--paper h3,
.card--paper h4,
.card--paper strong { color: #0A1226; }
.card--paper .muted { color: #5A6B8C; }
.card--paper .lede { color: #2C3A57; }

.card--stack {
  box-shadow:
    0 0 0 1px var(--line),
    10px 10px 0 -1px rgba(20, 27, 61, .95),
    10px 10px 0 0 var(--line);
}

/* 印刷标签 / 胶囊 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .42rem;
  padding: .3rem .7rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-strong);
  background: rgba(34, 230, 224, .07);
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.3;
  letter-spacing: .1em;
  white-space: nowrap;
}

.tag--ember {
  border-color: rgba(255, 75, 43, .5);
  background: rgba(255, 75, 43, .1);
  color: #FFB3A3;
}

.tag--muted {
  border-color: rgba(147, 166, 201, .3);
  background: rgba(147, 166, 201, .08);
  color: var(--muted);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .34rem .68rem;
  border-radius: 8px;
  border: 1px solid rgba(159, 247, 242, .28);
  background: rgba(6, 50, 58, .62);
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.3;
  letter-spacing: .1em;
  white-space: nowrap;
}

.chip--version { flex: none; }

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--cyan), rgba(34, 230, 224, 0));
  opacity: .45;
}

/* ── 7. 按钮 ────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .72rem 1.25rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: .9rem;
  line-height: 1.3;
  letter-spacing: .01em;
  white-space: nowrap;
  transition: transform .18s ease, background-color .18s ease, color .18s ease,
              border-color .18s ease, box-shadow .18s ease;
}

.btn--ember {
  background: var(--ember);
  color: var(--ink);
  box-shadow: 0 14px 30px -18px rgba(255, 75, 43, .95);
}

@media (hover: hover) {
  .btn--ember:hover {
    transform: translateY(-2px);
    background: #FF6247;
    box-shadow: 0 18px 34px -16px rgba(255, 75, 43, 1);
  }
}

.btn--ghost {
  background: rgba(34, 230, 224, .06);
  border-color: var(--line-strong);
  color: var(--cyan-soft);
}

@media (hover: hover) {
  .btn--ghost:hover {
    transform: translateY(-2px);
    background: rgba(34, 230, 224, .13);
    color: var(--paper);
  }
}

.btn--sm { padding: .52rem .95rem; font-size: .82rem; }

/* ── 8. 图像容器（页面阶段填入 <img>） ─────────────────────────────── */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, #0B1230 0%, #06323A 100%);
  aspect-ratio: 16 / 9;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 3 / 4; }
.media--tall { aspect-ratio: 4 / 5; }

.media > img,
.media > svg,
.media > video {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(34, 230, 224, .08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 230, 224, .08) 1px, transparent 1px);
  background-size: 40px 40px;
  -webkit-mask-image: linear-gradient(160deg, #000 0%, transparent 72%);
  mask-image: linear-gradient(160deg, #000 0%, transparent 72%);
}

.media__label {
  position: absolute;
  left: .85rem;
  bottom: .85rem;
  z-index: 3;
  padding: .24rem .62rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: rgba(5, 11, 26, .74);
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
}

/* ── 9. 时间轴 / 面包屑 ─────────────────────────────────────────────── */
.timeline {
  position: relative;
  display: grid;
  gap: 1.6rem;
  padding-left: 1.85rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: .5rem;
  bottom: .5rem;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(34, 230, 224, .05));
}

.timeline__item { position: relative; }

.timeline__item::before {
  content: "";
  position: absolute;
  left: -1.85rem;
  top: .55rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 230, 224, .12);
}

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

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
}

.crumbs li { display: flex; align-items: center; gap: .5rem; }

.crumbs li + li::before {
  content: "/";
  color: rgba(147, 166, 201, .45);
}

.crumbs a { transition: color .18s ease; }
.crumbs a:hover { color: var(--cyan-soft); }

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

/* ── 10. 头部 ───────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(5, 11, 26, .84);
  border-bottom: 1px solid var(--line-soft);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
}

.skip-link {
  position: absolute;
  top: .55rem;
  left: 50%;
  z-index: 300;
  padding: .6rem 1.15rem;
  border-radius: var(--radius-pill);
  background: var(--cyan);
  color: var(--ink);
  font-weight: 700;
  font-size: .88rem;
  transform: translate(-50%, -220%);
  transition: transform .2s ease;
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 200;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--ember));
  will-change: transform;
}

/* 顶部数据状态条 */
.topline {
  background: #0A122A;
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
  max-height: 46px;
  transition: max-height .3s ease, opacity .3s ease, border-color .3s ease;
}

.site-header[data-compact] .topline {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.topline__inner {
  display: flex;
  align-items: center;
  gap: .65rem;
  min-height: 36px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}

.topline__pulse {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--ember);
  box-shadow: 0 0 0 0 rgba(255, 75, 43, .55);
  animation: leyu-pulse 2.4s ease-out infinite;
}

@keyframes leyu-pulse {
  0% { box-shadow: 0 0 0 0 rgba(255, 75, 43, .55); }
  70% { box-shadow: 0 0 0 9px rgba(255, 75, 43, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 75, 43, 0); }
}

.topline__label { color: var(--cyan-soft); }

.topline__meta {
  margin-left: auto;
  color: var(--muted);
}

.topline__meta .num { color: var(--cyan); }

/* 头部主栏 */
.header__bar {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1.25rem;
  min-height: var(--header-h);
  padding-block: .6rem;
  transition: min-height .28s ease, padding-block .28s ease;
}

.site-header[data-compact] .header__bar {
  min-height: 60px;
  padding-block: .35rem;
}

/* 品牌 */
.brand {
  justify-self: start;
  display: inline-flex;
  flex-direction: column;
  gap: .2rem;
  flex: none;
}

.brand__word {
  display: flex;
  align-items: baseline;
  gap: .32rem;
  line-height: 1;
}

.brand__mark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.34rem;
  letter-spacing: -.02em;
  color: var(--paper);
}

.brand__cn {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.02rem;
  color: var(--cyan);
}

.brand__slogan {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--muted);
  white-space: nowrap;
}

/* 悬浮胶囊导航 */
.nav {
  justify-self: center;
  padding: 5px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: rgba(20, 27, 61, .74);
  box-shadow: inset 0 1px 0 rgba(159, 247, 242, .08), 0 14px 34px -26px rgba(0, 0, 0, .95);
}

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

.nav__list a {
  display: block;
  padding: .5rem .82rem;
  border-radius: var(--radius-pill);
  font-size: .86rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--muted);
  white-space: nowrap;
  transition: color .18s ease, background-color .18s ease;
}

@media (hover: hover) {
  .nav__list a:hover {
    color: var(--cyan-soft);
    background: rgba(34, 230, 224, .09);
  }
}

.nav__list a[aria-current="page"] {
  color: var(--ink);
  background: var(--cyan);
  box-shadow: 0 0 0 1px rgba(159, 247, 242, .5), 0 8px 20px -12px rgba(34, 230, 224, .95);
}

/* 头部右侧 */
.header__side {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: .6rem;
}

.nav-toggle {
  display: none;
  position: relative;
  width: 42px;
  height: 42px;
  flex: none;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(20, 27, 61, .72);
  transition: border-color .18s ease, background-color .18s ease;
}

.nav-toggle__bar {
  position: absolute;
  left: 11px;
  right: 11px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform .22s ease, opacity .22s ease;
}

.nav-toggle__bar:nth-child(1) { top: 15px; }
.nav-toggle__bar:nth-child(2) { top: 23px; }

.nav-toggle[aria-expanded="true"] {
  border-color: var(--line-strong);
  background: rgba(34, 230, 224, .12);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  transform: translateY(-4px) rotate(-45deg);
}

/* 移动端导航 */
@media (max-width: 1040px) {
  .header__bar {
    grid-template-columns: auto auto;
    justify-content: space-between;
  }

  .nav-toggle { display: block; }

  .nav {
    display: none;
    justify-self: stretch;
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    padding: 12px;
    border-radius: 22px;
    border-color: var(--line-strong);
    background: rgba(9, 15, 36, .98);
    box-shadow: 0 34px 66px -32px rgba(0, 0, 0, 1);
  }

  .nav[data-open="true"] { display: block; }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav__list a {
    padding: .8rem 1rem;
    border-radius: 13px;
    font-size: 1rem;
  }
}

@media (max-width: 720px) {
  .brand__slogan { display: none; }
}

@media (max-width: 560px) {
  .chip--version { display: none; }
  .topline__label { font-size: 10px; letter-spacing: .1em; }
  .topline__inner { gap: .5rem; }
}

/* ── 11. 页脚 ───────────────────────────────────────────────────────── */
.site-footer {
  position: relative;
  margin-top: clamp(4rem, 8vw, 7rem);
  border-top: 1px solid var(--line);
  background:
    radial-gradient(120% 62% at 12% 0%, rgba(6, 50, 58, .5) 0%, rgba(6, 50, 58, 0) 62%),
    linear-gradient(180deg, #070F24 0%, #050B1A 100%);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan) 16%, var(--ember) 50%, var(--cyan) 84%, transparent);
  opacity: .6;
}

.site-footer::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(34, 230, 224, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 230, 224, .05) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(80% 100% at 82% 0%, #000, transparent 70%);
  mask-image: radial-gradient(80% 100% at 82% 0%, #000, transparent 70%);
}

.footer__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.5fr);
  gap: clamp(2rem, 4vw, 3.5rem);
  padding-block: clamp(3rem, 6vw, 4.5rem) clamp(2.25rem, 4vw, 3rem);
}

.footer__brand {
  display: inline-flex;
  align-items: baseline;
  gap: .34rem;
  line-height: 1;
}

.footer__mark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: -.02em;
  color: var(--paper);
}

.footer__cn {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--cyan);
}

.footer__slogan {
  margin-top: .6rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan-soft);
  max-width: none;
}

.footer__contact {
  display: grid;
  gap: .5rem;
  margin-top: 1.6rem;
  font-size: .9rem;
}

.footer__contact li {
  display: flex;
  flex-wrap: wrap;
  gap: .2rem .75rem;
  align-items: baseline;
}

.footer__k {
  flex: none;
  min-width: 4.4em;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}

.footer__v { color: var(--text); word-break: break-word; }
.footer__v.num { color: var(--cyan); }

.footer__note {
  margin-top: 1rem;
  max-width: 40ch;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--muted);
}

.footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.75rem;
}

.footer__col h3 {
  margin-bottom: .95rem;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--cyan);
}

.footer__col li + li { margin-top: .1rem; }

.footer__col a {
  display: inline-block;
  padding: .22rem 0;
  font-size: .92rem;
  color: var(--muted);
  transition: color .18s ease, transform .18s ease;
}

@media (hover: hover) {
  .footer__col a:hover {
    color: var(--paper);
    transform: translateX(3px);
  }
}

.footer__base {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line-soft);
  padding-block: 1.35rem;
}

.footer__base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
}

.footer__legal { color: var(--cyan-soft); }
.footer__copy { color: var(--muted); }
.footer__year { margin-left: auto; }

@media (max-width: 900px) {
  .footer__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 2.5rem;
    padding-block: clamp(2.75rem, 8vw, 3.5rem) 2.25rem;
  }
}

@media (max-width: 620px) {
  .footer__nav { grid-template-columns: minmax(0, 1fr); gap: 1.75rem; }
  .footer__year { margin-left: 0; }
}

/* ── 12. 滚动显现 ───────────────────────────────────────────────────── */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s ease, transform .5s ease;
}

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

/* ── 13. 焦点可见 ───────────────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

.btn:focus-visible,
.nav__list a:focus-visible,
.nav-toggle:focus-visible { outline-offset: 2px; }

/* ── 14. 动效偏好降级 ───────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

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

  .card:hover,
  .btn:hover { transform: none; }
}