/* ============================================================
   竞博指南 · site.css
   深海蓝底 / 竞速橙锚点 / 荧光青高亮
   纵向栏目索引轨道 + 堆叠面板语言
   ============================================================ */

:root {
  --ink-900: #061626;
  --ink-800: #0B2238;
  --ink-700: #12314D;
  --orange-500: #FF6A1A;
  --orange-300: #FF9A5C;
  --cyan-400: #2FE3D0;
  --gray-300: #A9B8C8;
  --paper: #F5F8FB;
  --ink-black: #03080F;
  --mist: #D7E2EC;

  --rail-w: 104px;
  --topbar-h: 64px;
  --page-max: 1200px;

  --font-sans: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(.22, .8, .28, 1);
  --dur-1: 180ms;
  --dur-2: 240ms;

  --r-xl: 32px;
  --r-lg: 24px;
  --r-md: 16px;

  --line-soft: rgba(215, 226, 236, .12);
  --line-mid: rgba(215, 226, 236, .22);

  --scroll-progress: 0;
}

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

ul, ol { margin: 0; padding: 0; }

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

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

a { color: var(--cyan-400); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--orange-300); }

:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection { background: var(--orange-500); color: var(--ink-black); }

/* ---------- 标题与排版基元 ---------- */
.display {
  margin: 0;
  font-size: clamp(32px, 5.4vw, 68px);
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: -.02em;
}

.kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.8;
  color: var(--gray-300);
}

.section-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--orange-500);
}

/* ---------- 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 48px);
}

#main-content {
  display: block;
  scroll-margin-top: 24px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  display: inline-flex;
  align-items: center;
  padding: 11px 20px;
  border-radius: 999px;
  background: var(--orange-500);
  color: var(--ink-black);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .02em;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform var(--dur-1) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); color: var(--ink-black); }

@media (min-width: 900px) {
  .skip-link { left: calc(var(--rail-w) + 16px); }
}

/* ============================================================
   头部 · 纵向栏目索引轨道
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 60;
}

.rail {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: 100%;
  height: 100%;
  padding: 20px 10px 22px;
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 56%, #030D18 100%);
  border-right: 1px solid var(--line-soft);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--ink-700) transparent;
}

.rail::-webkit-scrollbar { width: 4px; }
.rail::-webkit-scrollbar-thumb { background: var(--ink-700); border-radius: 4px; }

/* 品牌 */
.rail__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--paper);
  text-decoration: none;
}

.rail__glyph {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 15px;
  background: var(--paper);
  color: var(--ink-900);
  font-size: 19px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0;
  box-shadow: 0 10px 22px -14px rgba(0, 0, 0, .9);
  transition: background-color var(--dur-1) var(--ease), transform var(--dur-1) var(--ease);
}

.rail__brand:hover .rail__glyph,
.rail__brand:focus-visible .rail__glyph {
  background: var(--orange-500);
  color: var(--ink-black);
  transform: rotate(-6deg);
}

.rail__brandname {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .1em;
  white-space: nowrap;
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--line-mid);
  border-radius: 999px;
  background: transparent;
  color: var(--paper);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  cursor: pointer;
  transition: border-color var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}

.nav-toggle:hover { border-color: var(--orange-300); color: var(--orange-300); }

.nav-toggle__icon {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__icon span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur-1) var(--ease), opacity 140ms linear;
}

.nav-toggle__icon span:nth-child(2) { width: 11px; }

.site-header[data-open="true"] .nav-toggle__icon span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__icon span:nth-child(2) { opacity: 0; }
.site-header[data-open="true"] .nav-toggle__icon span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 导航 */
.rail__nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: none;
}

.rail__nav::-webkit-scrollbar { display: none; }

.rail__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
}

.rail__item { width: 100%; }

.rail__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 9px 2px;
  border-radius: 14px;
  color: var(--gray-300);
  text-decoration: none;
  text-align: center;
  transition: background-color var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}

.rail__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  color: rgba(169, 184, 200, .78);
  transition: color var(--dur-1) var(--ease);
}

.rail__label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .01em;
  line-height: 1.35;
  white-space: nowrap;
}

.rail__link:hover,
.rail__link:focus-visible {
  background: var(--ink-700);
  color: var(--paper);
}

.rail__link:hover .rail__num,
.rail__link:focus-visible .rail__num { color: var(--orange-300); }

.rail__link[aria-current="page"] {
  background: var(--orange-500);
  color: var(--ink-black);
}

.rail__link[aria-current="page"] .rail__num { color: rgba(3, 8, 15, .72); }

/* 轨道底部 */
.rail__meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 100%;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.rail__meta-text {
  display: none;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gray-300);
}

.rail__meta-link {
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--gray-300);
  text-decoration: none;
  transition: color var(--dur-1) var(--ease);
}

.rail__meta-link:hover { color: var(--orange-300); }

.rail__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  margin-top: 4px;
  padding: 10px 12px;
  border-radius: 999px;
  background: var(--orange-500);
  color: var(--ink-black);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: .04em;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease);
}

.rail__cta:hover,
.rail__cta:focus-visible {
  background: var(--orange-300);
  color: var(--ink-black);
  box-shadow: 0 0 0 4px rgba(255, 154, 92, .16);
}

/* 阅读进度 */
.progress {
  position: fixed;
  z-index: 61;
  pointer-events: none;
  background: rgba(215, 226, 236, .08);
}

.progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, var(--orange-500), var(--cyan-400));
}

@media (min-width: 900px) {
  .progress {
    top: 0;
    bottom: 0;
    left: calc(var(--rail-w) - 3px);
    width: 3px;
  }
  .progress__bar {
    transform-origin: top center;
    transform: scaleY(var(--scroll-progress, 0));
    transition: transform 90ms linear;
  }
}

/* 桌面端为主内容让位 */
@media (min-width: 900px) {
  body { padding-left: var(--rail-w); }
}

/* ============================================================
   头部 · 移动端 / 平板（< 900px）
   ============================================================ */
@media (max-width: 899px) {
  body { padding-top: var(--topbar-h); }

  html.nav-open,
  html.nav-open body { overflow: hidden; }

  .site-header {
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: 100%;
    height: var(--topbar-h);
  }

  .rail {
    flex-direction: row;
    align-items: center;
    gap: 10px;
    height: var(--topbar-h);
    padding: 0 14px;
    background: rgba(11, 34, 56, .96);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-right: none;
    border-bottom: 1px solid var(--line-soft);
    overflow: visible;
  }

  .rail__brand {
    flex-direction: row;
    align-items: center;
    gap: 10px;
    margin-right: auto;
  }

  .rail__glyph { width: 36px; height: 36px; border-radius: 12px; font-size: 16px; }
  .rail__brandname { font-size: 14px; letter-spacing: .06em; }

  .nav-toggle { display: inline-flex; flex: 0 0 auto; }

  .rail__nav {
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    bottom: 0;
    z-index: 2;
    width: min(340px, 86vw);
    padding: 20px 18px 28px;
    gap: 14px;
    align-items: stretch;
    background: var(--ink-800);
    border-right: 1px solid var(--line-mid);
    box-shadow: 24px 0 60px -40px rgba(0, 0, 0, .95);
    transform: translateX(-102%);
    visibility: hidden;
    transition: transform var(--dur-2) var(--ease), visibility var(--dur-2) var(--ease);
    overflow-y: auto;
  }

  .site-header[data-open="true"] .rail__nav {
    transform: translateX(0);
    visibility: visible;
  }

  .site-header::after {
    content: "";
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
    background: rgba(3, 8, 15, .68);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--dur-2) var(--ease);
  }

  .site-header[data-open="true"]::after {
    opacity: 1;
    pointer-events: auto;
  }

  .rail__list { gap: 4px; }

  .rail__link {
    flex-direction: row;
    align-items: baseline;
    justify-content: flex-start;
    gap: 14px;
    padding: 12px 14px;
    border-radius: 16px;
    text-align: left;
  }

  .rail__num { font-size: 11px; }
  .rail__label { font-size: 15px; }

  .rail__meta {
    align-items: flex-start;
    gap: 12px;
    margin-top: auto;
    padding-top: 18px;
    border-top: 1px solid var(--line-soft);
  }

  .rail__meta-text { display: block; }

  .rail__meta-link {
    display: inline-flex;
    padding: 10px 16px;
    border: 1px solid var(--line-mid);
    border-radius: 999px;
    font-size: 13.5px;
    color: var(--paper);
  }

  .rail__cta {
    align-self: flex-start;
    margin-top: 0;
    padding: 12px 22px;
    font-size: 14px;
  }

  .progress {
    top: var(--topbar-h);
    left: 0;
    right: 0;
    height: 2px;
  }

  .progress__bar {
    transform-origin: left center;
    transform: scaleX(var(--scroll-progress, 0));
  }

  #main-content { scroll-margin-top: calc(var(--topbar-h) + 20px); }
}

/* ============================================================
   通用组件
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--dur-1) var(--ease),
              color var(--dur-1) var(--ease),
              border-color var(--dur-1) var(--ease),
              box-shadow var(--dur-1) var(--ease);
}

.btn--solid {
  background: var(--orange-500);
  color: var(--ink-black);
}

.btn--solid:hover,
.btn--solid:focus-visible {
  background: var(--orange-300);
  color: var(--ink-black);
  box-shadow: 0 12px 30px -18px rgba(255, 106, 26, .9);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(47, 227, 208, .45);
  color: var(--paper);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--cyan-400);
  color: var(--cyan-400);
  background: rgba(47, 227, 208, .08);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gray-300);
}

.breadcrumb li { display: inline-flex; align-items: center; gap: 6px; }

.breadcrumb li + li::before {
  content: "/";
  color: rgba(169, 184, 200, .45);
}

.breadcrumb a {
  color: var(--gray-300);
  text-decoration: none;
}

.breadcrumb a:hover { color: var(--cyan-400); }

.breadcrumb [aria-current="page"] { color: var(--orange-300); }

.panel {
  position: relative;
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-xl);
  background: var(--ink-800);
}

.panel--offset { margin-left: clamp(0px, 3vw, 44px); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border: 1px solid var(--line-mid);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--gray-300);
  white-space: nowrap;
}

.tag--accent {
  border-color: rgba(255, 106, 26, .5);
  color: var(--orange-300);
}

.tag--info {
  border-color: rgba(47, 227, 208, .45);
  color: var(--cyan-400);
}

/* 图片容器基础规则（共享头尾不使用，供页面阶段放置图片） */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
  aspect-ratio: 16 / 10;
}

.media > img,
.media > svg,
.media > picture > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.media--texture {
  background-image:
    radial-gradient(120% 120% at 12% 8%, rgba(47, 227, 208, .18), transparent 58%),
    radial-gradient(100% 100% at 92% 92%, rgba(255, 106, 26, .22), transparent 62%),
    linear-gradient(160deg, var(--ink-700), var(--ink-900));
}

.media__caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--gray-300);
}

/* 显现动画 */
.js-motion .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--dur-2) ease-out, transform var(--dur-2) ease-out;
}

.js-motion .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 96px);
  padding: clamp(48px, 6vw, 80px) 0 clamp(32px, 4vw, 44px);
  border-top: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(47, 227, 208, .10), transparent 58%),
    radial-gradient(90% 80% at 100% 0%, rgba(255, 106, 26, .10), transparent 62%),
    linear-gradient(180deg, var(--ink-900), #030D18 78%, #02060C 100%);
  color: var(--paper);
}

.footer-inner {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  width: 100%;
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 48px);
}

/* 顶部：品牌 + 链接 */
.footer-top {
  display: grid;
  gap: 28px;
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.footer-brand__glyph {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 18px;
  background: var(--paper);
  color: var(--ink-900);
  font-size: 22px;
  font-weight: 900;
  line-height: 1;
}

.footer-brand__name {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .05em;
}

.footer-brand__desc {
  max-width: 42ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--gray-300);
}

.footer-links ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-links a {
  display: inline-flex;
  padding: 9px 16px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--paper);
  text-decoration: none;
  transition: border-color var(--dur-1) var(--ease),
              color var(--dur-1) var(--ease),
              background-color var(--dur-1) var(--ease);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  border-color: var(--cyan-400);
  color: var(--cyan-400);
  background: rgba(47, 227, 208, .08);
}

/* 改版锚点板 */
.footer-revision {
  position: relative;
  display: grid;
  gap: 22px;
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid rgba(255, 106, 26, .38);
  border-radius: var(--r-xl);
  background:
    radial-gradient(120% 150% at 100% 0%, rgba(255, 106, 26, .22), transparent 60%),
    var(--ink-800);
  box-shadow: 0 30px 60px -46px rgba(0, 0, 0, .95);
  overflow: hidden;
}

.footer-revision::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--orange-500), var(--cyan-400));
}

.footer-revision__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--orange-300);
}

.footer-revision__title {
  margin: 0;
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.01em;
}

.footer-revision__meta {
  display: grid;
  gap: 10px;
  margin: 0;
}

.footer-revision__meta > div {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding-bottom: 9px;
  border-bottom: 1px dashed rgba(215, 226, 236, .16);
}

.footer-revision__meta > div:last-child { border-bottom: 0; padding-bottom: 0; }

.footer-revision__meta dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--gray-300);
}

.footer-revision__meta dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--paper);
}

.footer-revision .btn { justify-self: start; }

/* 底部：联系 + 法务 */
.footer-bottom {
  display: grid;
  gap: 26px;
}

.footer-contact__title {
  margin: 0 0 16px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--cyan-400);
  text-transform: uppercase;
}

.contact-list {
  list-style: none;
  display: grid;
  gap: 10px;
  max-width: 560px;
}

.contact-list li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(215, 226, 236, .14);
}

.contact-list__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--gray-300);
}

.contact-list__val {
  font-size: 15px;
  color: var(--paper);
  word-break: break-word;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  line-height: 1.9;
  color: var(--gray-300);
}

.footer-base p { margin: 0; }

/* 中等宽度收敛 */
@media (min-width: 760px) {
  .footer-top {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
    gap: 40px;
  }
  .footer-links { justify-self: end; }
}

@media (min-width: 900px) {
  .footer-revision {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr) auto;
    align-items: center;
    gap: 36px;
  }
  .footer-bottom { gap: 32px; }
  .footer-base { margin-top: 6px; }
}

/* ============================================================
   动效降级
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .js-motion .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .progress__bar { transition: none; }
  .rail__nav { transition: none; }
}