/* ============================================================
   亿万电竞 · 中国区主站  —  /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 轨道头部 / 页脚 / 基础组件
   ============================================================ */

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

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

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

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

a { color: inherit; text-decoration: none; }
img, svg, video { display: block; max-width: 100%; }
em { font-style: normal; }

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

/* ---------- 2. 设计令牌 ---------- */
:root {
  --ink: #0A0B12;
  --ink-2: #14161F;
  --line: #2A2E3D;
  --paper: #F2EDE4;
  --paper-2: #E2DACB;

  --violet: #6C4DF6;
  --violet-soft: #9B7CFF;
  --magenta: #FF2D9B;
  --cyan: #4DE8E0;
  --yellow: #FFD166;

  --txt: #F2EDE4;
  --txt-dim: #A2A8BC;

  --rail: 112px;
  --bw: 2px;
  --hard: 6px 8px 0 0 var(--ink-2);
  --hard-accent: 8px 10px 0 0 var(--violet);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);

  --font-sans: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC",
    "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular",
    Menlo, Consolas, "Courier New", monospace;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(42, 46, 61, 0.34) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 46, 61, 0.34) 1px, transparent 1px);
  background-size: 72px 72px;
  color: var(--txt);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  color: var(--txt);
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.06;
}

h2 {
  font-size: clamp(1.5rem, 3.2vw, 2.125rem);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.24;
}

h3 {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.4;
}

p { max-width: 68ch; }
strong { font-weight: 800; color: var(--paper); }

/* ---------- 4. 通用工具类 ---------- */
.wrap {
  width: min(1240px, 100% - 40px);
  margin-inline: auto;
}

.section { padding-block: clamp(40px, 6vw, 88px); }

.mono {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 0.75rem;
}

.lede {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--txt);
  max-width: 62ch;
}

.rule {
  height: var(--bw);
  border: 0;
  background: var(--line);
  margin-block: clamp(28px, 4vw, 56px);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.3rem;
  border: var(--bw) solid var(--line);
  background: var(--ink-2);
  color: var(--txt);
  font-weight: 800;
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease),
    background-color 180ms var(--ease), color 180ms var(--ease),
    border-color 180ms var(--ease);
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--hard-accent);
  border-color: var(--violet);
}

.btn--solid {
  background: var(--violet);
  border-color: var(--violet);
  color: var(--paper);
}

.btn--solid:hover {
  box-shadow: 8px 10px 0 0 var(--magenta);
  border-color: var(--magenta);
}

.btn--ghost { background: transparent; }

/* ---------- 6. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.18rem 0.55rem;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  line-height: 1.7;
}

.tag--cyan { color: var(--cyan); }
.tag--magenta { color: var(--magenta); }
.tag--violet { color: var(--violet-soft); }
.tag--yellow { color: var(--yellow); }

/* ---------- 7. 卡片 / 面板 / 框景 ---------- */
.card {
  position: relative;
  background: var(--ink-2);
  border: var(--bw) solid var(--line);
  padding: 22px;
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease),
    border-color 180ms var(--ease);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--hard);
  border-color: var(--violet);
}

.card__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.card__title { margin-top: 0.5rem; font-size: 1.125rem; font-weight: 800; }
.card__body { margin-top: 0.5rem; font-size: 0.9375rem; color: var(--txt-dim); }

.panel {
  background: var(--paper);
  color: var(--ink);
  border: var(--bw) solid var(--ink);
  padding: clamp(20px, 3vw, 44px);
  box-shadow: var(--hard-accent);
}

.panel h1, .panel h2, .panel h3, .panel h4 { color: var(--ink); }
.panel p { color: #23242E; }
.panel a { color: var(--violet); text-decoration: underline; text-underline-offset: 3px; }
.panel .mono { color: #4A4C5E; }

.frame {
  position: relative;
  border: var(--bw) solid var(--line);
  background: var(--ink-2);
  padding: clamp(20px, 4vw, 48px);
}

.frame::before,
.frame::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: var(--bw) solid var(--cyan);
}

.frame::before { top: -2px; left: -2px; border-right: 0; border-bottom: 0; }
.frame::after { right: -2px; bottom: -2px; border-top: 0; border-left: 0; }

/* ---------- 8. 图片容器基础规则 ---------- */
.figure {
  position: relative;
  border: var(--bw) solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
  box-shadow: var(--hard);
}

.figure__img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background:
    radial-gradient(120% 100% at 12% 0%, rgba(108, 77, 246, 0.55), transparent 62%),
    linear-gradient(122deg, rgba(255, 45, 155, 0.34) 0%, rgba(77, 232, 224, 0.26) 72%),
    var(--ink-2);
}

.figure--wide .figure__img { aspect-ratio: 21 / 9; }
.figure--tall .figure__img { aspect-ratio: 3 / 4; }

.figure__cap {
  display: block;
  border-top: var(--bw) solid var(--line);
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan);
}

/* ---------- 9. 数据行 ---------- */
.data-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
}

.data-row__key { color: var(--txt-dim); }
.data-row__val { color: var(--cyan); }

/* ---------- 10. 栅格 ---------- */
.grid { display: grid; gap: 20px; }
.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }

/* ---------- 11. 面包屑 ---------- */
.breadcrumb { margin-bottom: 26px; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.breadcrumb__link { color: var(--txt-dim); transition: color 160ms var(--ease); }
.breadcrumb__link:hover { color: var(--cyan); }
.breadcrumb__sep { color: var(--line); }
.breadcrumb__current { color: var(--cyan); }

/* ---------- 12. 显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

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

/* ============================================================
   13. 头部外壳
   ============================================================ */
.skip-link {
  position: absolute;
  left: 12px;
  top: -120px;
  z-index: 200;
  padding: 0.6rem 1rem;
  background: var(--cyan);
  color: var(--ink);
  font-weight: 800;
  font-size: 0.875rem;
  border: var(--bw) solid var(--ink);
  transition: top 160ms var(--ease);
}

.skip-link:focus { top: 12px; }

.scroll-line {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 120;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--violet) 0%, var(--magenta) 55%, var(--cyan) 100%);
  pointer-events: none;
  transition: width 120ms linear;
}

.site-head {
  position: sticky;
  top: 0;
  z-index: 80;
}

/* 顶部条（移动 / 平板） */
.headbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: rgba(10, 11, 18, 0.95);
  border-bottom: var(--bw) solid var(--line);
}

.headbar__brand { display: flex; align-items: center; gap: 10px; }

.headbar__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 34px;
  height: 34px;
  background: var(--violet);
  color: var(--paper);
  font-weight: 900;
  font-size: 1.0625rem;
  border: var(--bw) solid var(--cyan);
}

.headbar__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  font-weight: 900;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
}

.headbar__tag {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: var(--bw) solid var(--line);
  background: var(--ink-2);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.nav-toggle:hover { border-color: var(--violet-soft); color: var(--cyan); }
.nav-toggle[aria-expanded="true"] { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle__bars { position: relative; display: block; width: 16px; height: 10px; }

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 180ms var(--ease), top 180ms var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { top: 8px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 4px; transform: rotate(-45deg); }

/* 轨道 / 抽屉本体 */
.rail {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 90;
  display: flex;
  flex-direction: column;
  width: min(88vw, 360px);
  background: var(--ink);
  border-left: var(--bw) solid var(--line);
  overflow-y: auto;
  overscroll-behavior: contain;
  transform: translateX(101%);
  transition: transform 220ms var(--ease);
}

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

.rail__top {
  padding: 16px;
  border-bottom: var(--bw) solid var(--line);
  background: linear-gradient(180deg, #171a27 0%, var(--ink) 100%);
}

.rail__brand { display: flex; align-items: center; gap: 10px; }

.rail__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 40px;
  height: 40px;
  background: var(--violet);
  color: var(--paper);
  font-weight: 900;
  font-size: 1.125rem;
  border: var(--bw) solid var(--cyan);
}

.rail__wordmark { font-weight: 900; font-size: 1rem; letter-spacing: -0.01em; }

.rail__dock {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px;
  border-bottom: var(--bw) solid var(--line);
}

/* 赛区坐标板 */
.region { position: relative; }

.region__trigger {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 3px;
  width: 100%;
  padding: 9px 10px;
  border: var(--bw) solid var(--line);
  background: var(--ink-2);
  text-align: left;
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.region__trigger:hover { border-color: var(--violet-soft); }
.region__trigger[aria-expanded="true"] { border-color: var(--cyan); background: #171a27; }

.region__code {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.region__label { font-weight: 800; font-size: 0.9375rem; letter-spacing: 0.02em; }

.region__board {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  z-index: 30;
  padding: 12px;
  background: var(--ink-2);
  border: var(--bw) solid var(--cyan);
  box-shadow: 8px 10px 0 0 rgba(108, 77, 246, 0.65);
}

.region__board[hidden] { display: none; }

.region__board-head {
  margin: 0 0 8px;
  font-size: 0.5625rem;
  letter-spacing: 0.16em;
  color: var(--txt-dim);
}

.region__list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; }

.region__opt {
  width: 100%;
  padding: 7px 8px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--txt);
  font-size: 0.8125rem;
  font-weight: 600;
  text-align: left;
  transition: background-color 140ms var(--ease), color 140ms var(--ease),
    border-color 140ms var(--ease);
}

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

.region__opt[aria-pressed="true"] {
  background: var(--violet);
  border-color: var(--violet);
  color: var(--paper);
}

.region__hint {
  margin: 8px 0 0;
  font-size: 0.5625rem;
  letter-spacing: 0.1em;
  color: var(--txt-dim);
}

/* 常驻键 */
.rail__key {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 9px 10px;
  border: var(--bw) solid var(--line);
  background: var(--ink-2);
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease),
    color 180ms var(--ease);
}

.rail__key-code {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--magenta);
}

.rail__key-label { font-size: 0.8125rem; font-weight: 800; letter-spacing: 0.02em; }

.rail__key:hover {
  background: var(--violet);
  border-color: var(--violet);
  color: var(--paper);
}

.rail__key:hover .rail__key-code { color: var(--paper); }

/* 主导航列表 */
.rail__nav { flex: 1 1 auto; min-height: 0; overflow-y: auto; overscroll-behavior: contain; }
.rail__list { display: flex; flex-direction: column; }
.rail__item { border-bottom: 1px solid var(--line); }

.rail__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.02em;
  color: var(--txt);
  transition: background-color 180ms var(--ease), color 180ms var(--ease);
}

.rail__link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 8px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms var(--ease);
}

.rail__link:hover { background: var(--ink-2); color: var(--cyan); }
.rail__link:hover::after,
.rail__link:focus-visible::after { transform: scaleX(1); }

.rail__idx {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--violet-soft);
  transition: color 180ms var(--ease);
}

.rail__txt { font-size: 1rem; }

.rail__link[aria-current="page"] { background: rgba(108, 77, 246, 0.18); color: var(--paper); }

.rail__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--magenta);
}

.rail__link[aria-current="page"] .rail__idx { color: var(--magenta); }

.rail__foot {
  padding: 12px 14px;
  border-top: var(--bw) solid var(--line);
  background: var(--ink-2);
}

.rail__stat {
  font-size: 0.5625rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
  text-align: center;
}

/* 抽屉遮罩 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 85;
  background: rgba(10, 11, 18, 0.72);
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms var(--ease);
}

.nav-scrim[data-show] { opacity: 1; pointer-events: auto; }

/* ============================================================
   14. 页脚
   ============================================================ */
.site-foot {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  background: var(--ink-2);
  border-top: 3px solid var(--violet);
}

.site-foot::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: min(200px, 32%);
  height: 3px;
  background: var(--cyan);
}

.foot__grid {
  display: grid;
  gap: 32px;
  padding-block: clamp(36px, 5vw, 64px);
}

.foot__brand { max-width: 36ch; }
.foot__mark { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 900; letter-spacing: -0.02em; }
.foot__tag { margin-top: 0.5rem; font-size: 0.9375rem; color: var(--txt-dim); }
.foot__coords {
  margin-top: 1rem;
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.foot__head {
  margin-bottom: 0.9rem;
  padding-bottom: 0.5rem;
  border-bottom: var(--bw) solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--violet-soft);
}

.foot__links { display: flex; flex-direction: column; gap: 0.6rem; }

.foot__link {
  position: relative;
  display: inline-block;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--txt);
  transition: color 180ms var(--ease);
}

.foot__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms var(--ease);
}

.foot__link:hover { color: var(--cyan); }
.foot__link:hover::after { transform: scaleX(1); }

.foot__contact { max-width: 40ch; }

.copy-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.copy-row__value {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--cyan);
  word-break: break-all;
}

.copy-btn {
  padding: 0.35rem 0.6rem;
  border: var(--bw) solid var(--line);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: border-color 160ms var(--ease), color 160ms var(--ease),
    background-color 160ms var(--ease);
}

.copy-btn:hover { border-color: var(--magenta); color: var(--magenta); }
.copy-btn[data-copied] { background: var(--cyan); border-color: var(--cyan); color: var(--ink); }

.foot__line { font-size: 0.875rem; color: var(--txt-dim); }
.foot__line + .foot__line { margin-top: 0.25rem; }

.foot__base { border-top: var(--bw) solid var(--line); background: var(--ink); }

.foot__base-in {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.75rem;
  padding-block: 20px 28px;
}

.foot__icp { font-size: 0.6875rem; letter-spacing: 0.08em; color: var(--txt-dim); }
.foot__legal { font-size: 0.75rem; color: var(--txt-dim); }
.foot__note { flex: 1 1 100%; max-width: 72ch; font-size: 0.75rem; color: var(--txt-dim); }

/* ============================================================
   15. 响应式
   ============================================================ */
@media (min-width: 640px) {
  .foot__grid { grid-template-columns: repeat(2, 1fr); gap: 30px 24px; }
  .wrap { width: min(1240px, 100% - 56px); }
}

@media (min-width: 768px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  body { font-size: 16.5px; }
}

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

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

  .site-head {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--rail);
    z-index: 80;
  }

  .headbar { display: none; }
  .nav-scrim { display: none; }

  .rail {
    position: absolute;
    inset: 0;
    width: 100%;
    transform: none;
    border-left: 0;
    border-right: var(--bw) solid var(--line);
    overflow: visible;
    background: linear-gradient(180deg, #171a27 0%, var(--ink) 32%);
  }

  .rail__top { padding: 16px 8px; }
  .rail__brand { justify-content: center; }
  .rail__wordmark { display: none; }
  .rail__mark { width: 46px; height: 46px; }

  .rail__dock { gap: 6px; padding: 10px 6px; }

  .region__trigger { align-items: center; padding: 8px 4px; text-align: center; }
  .region__code { font-size: 0.5rem; letter-spacing: 0.12em; }
  .region__label { font-size: 0.8125rem; }

  .region__board {
    top: -6px;
    left: calc(100% + 12px);
    right: auto;
    width: 268px;
  }

  .rail__key { align-items: center; gap: 2px; padding: 8px 4px; }
  .rail__key-code { font-size: 0.5rem; letter-spacing: 0.12em; }
  .rail__key-label { font-size: 0.75rem; letter-spacing: -0.01em; white-space: nowrap; }

  .rail__nav { overflow-y: auto; overflow-x: hidden; }

  .rail__link {
    flex-direction: column;
    gap: 3px;
    padding: 11px 4px;
    font-size: 0.8125rem;
  }

  .rail__idx { font-size: 0.5625rem; letter-spacing: 0.14em; }

  .rail__txt {
    font-size: 0.8125rem;
    letter-spacing: -0.02em;
    white-space: nowrap;
    text-align: center;
  }

  .rail__link::after {
    left: auto;
    right: 8px;
    top: 12px;
    bottom: 12px;
    width: 2px;
    height: auto;
    transform: scaleY(0);
    transform-origin: top;
  }

  .rail__link:hover::after,
  .rail__link:focus-visible::after { transform: scaleY(1); }

  .rail__link[aria-current="page"]::before {
    left: 8px;
    right: 8px;
    top: auto;
    bottom: 0;
    width: auto;
    height: 3px;
  }

  .rail__foot { padding: 10px 6px; }
  .rail__stat { font-size: 0.5rem; letter-spacing: 0.1em; }

  .foot__grid { grid-template-columns: 1.6fr 1fr 1fr 1fr 1.5fr; gap: 24px; }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1280px) {
  .wrap { width: min(1320px, 100% - 72px); }
}

/* ============================================================
   16. 无障碍与动效偏好
   ============================================================ */
@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;
    scroll-behavior: auto !important;
  }

  [data-reveal] { opacity: 1; transform: none; }
  .scroll-line { transition: none; }
}