/* ============================================================
   亿万指南 · 共享样式 /assets/site.css
   侧边导览轨道 + 紧凑命令栏 + 硬边框珠宝色分区
   ============================================================ */

/* ---------- 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, hr {
  margin: 0;
}

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

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

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

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

table { border-collapse: collapse; width: 100%; }

/* ---------- tokens ---------- */
:root {
  /* 品牌色 */
  --abyss: #081A29;
  --teal: #0B2E33;
  --slate: #1C3242;
  --paper: #F1F5F8;
  --mist: #C7D5E0;
  --cyan: #2DE2D0;
  --amber: #F6A623;
  --indigo: #4A3B7C;
  --wine: #6D2B3F;
  --graphite: #7A8896;
  --ink: #0B1A26;

  /* 结构与节奏 */
  --rail-w: 220px;
  --header-h: 62px;
  --gap: clamp(16px, 2vw, 24px);
  --pad: clamp(20px, 4vw, 56px);
  --shadow-hard: 6px 6px 0 rgba(4, 16, 26, 0.78);
  --shadow-hard-sm: 4px 4px 0 rgba(4, 16, 26, 0.7);

  /* 字体 */
  --font-display: "Archivo Black", "Anton", "Haettenschweiler", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 动效 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- base typography ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--paper);
  background-color: var(--abyss);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.01em;
}

p { text-wrap: pretty; }

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

.surface-paper :focus-visible,
.panel--paper :focus-visible {
  outline-color: #0B7D74;
}

.btn--primary:focus-visible {
  outline-color: var(--paper);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -90px;
  z-index: 200;
  display: inline-block;
  padding: 10px 16px;
  background: var(--cyan);
  color: #04141C;
  font-size: 14px;
  font-weight: 800;
  border: 2px solid #04141C;
  box-shadow: var(--shadow-hard-sm);
  transition: top 0.16s var(--ease);
}

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

/* ============================================================
   头部：移动端顶部条 / 桌面端左侧品牌轨道
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  min-height: var(--header-h);
  padding: 0 clamp(14px, 4vw, 20px);
  color: var(--paper);
  background-color: var(--abyss);
  background-image: repeating-linear-gradient(
    180deg,
    rgba(45, 226, 208, 0.05) 0 1px,
    rgba(8, 26, 41, 0) 1px 7px
  );
  border-bottom: 2px solid var(--slate);
}

.rail-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding-block: 9px;
}

/* 品牌 */
.brand {
  display: grid;
  grid-template-columns: 34px auto;
  grid-template-rows: auto auto;
  column-gap: 10px;
  align-items: center;
  color: var(--paper);
}

.brand__mark {
  grid-row: 1 / 3;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--cyan);
  color: #04141C;
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1;
  border: 2px solid #04101A;
  box-shadow: 3px 3px 0 rgba(4, 16, 26, 0.85);
}

.brand__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: 0.03em;
}

.brand__meta {
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  color: var(--graphite);
  white-space: nowrap;
}

/* 移动导航按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 6px 12px;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  border: 2px solid var(--slate);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.nav-toggle:hover {
  color: var(--paper);
  border-color: var(--cyan);
}

.nav-toggle__box {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.18s var(--ease);
}

.site-header[data-open] .nav-toggle {
  color: var(--cyan);
  border-color: var(--cyan);
}

.site-header[data-open] .nav-toggle__bar:first-child {
  transform: translateY(3px) rotate(45deg);
}

.site-header[data-open] .nav-toggle__bar:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

/* 导航（移动端为全屏抽屉） */
.rail-nav {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  display: none;
  padding: 18px 16px 152px;
  overflow-y: auto;
  overscroll-behavior: contain;
  background-color: var(--abyss);
  background-image: linear-gradient(180deg, rgba(11, 46, 51, 0.92), rgba(8, 26, 41, 0) 58%);
  border-top: 1px solid #17384A;
}

.site-header[data-open] .rail-nav {
  display: block;
  animation: navIn 0.2s var(--ease) both;
}

@keyframes navIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

.rail-nav__caption {
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--graphite);
  border-bottom: 1px dashed #1C3242;
}

.rail-nav__list {
  display: grid;
  gap: 4px;
  margin-top: 14px;
}

.rail-nav__link {
  position: relative;
  display: grid;
  grid-template-columns: 30px 1fr;
  align-items: center;
  gap: 10px;
  padding: 12px 10px;
  color: var(--mist);
  font-size: 16px;
  letter-spacing: 0.02em;
  border-left: 3px solid transparent;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.rail-nav__index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--graphite);
  transition: color 0.18s var(--ease);
}

.rail-nav__label { line-height: 1.2; }

.rail-nav__link:hover {
  background: var(--teal);
  border-left-color: var(--cyan);
  color: var(--paper);
}

.rail-nav__link:hover .rail-nav__index { color: var(--cyan); }

.rail-nav__link[aria-current="page"] {
  background: var(--teal);
  border-left-color: var(--amber);
  color: var(--paper);
}

.rail-nav__link[aria-current="page"] .rail-nav__index { color: var(--amber); }

.rail-nav__link[aria-current="page"]::after {
  content: "当前";
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  padding: 2px 5px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  color: var(--amber);
  background: rgba(246, 166, 35, 0.1);
  border: 1px solid rgba(246, 166, 35, 0.5);
}

/* 轨道底部状态与入口 */
.rail-panel {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 101;
  display: none;
  gap: 10px;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom, 0px));
  background: var(--teal);
  border-top: 2px solid var(--cyan);
}

.site-header[data-open] .rail-panel { display: grid; }

.rail-panel__hint {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  line-height: 1.5;
  color: var(--mist);
}

.rail-panel__dot {
  flex: 0 0 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(246, 166, 35, 0.18);
  animation: railPulse 2.6s var(--ease) infinite;
}

@keyframes railPulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(246, 166, 35, 0.18); }
  50% { box-shadow: 0 0 0 7px rgba(246, 166, 35, 0.04); }
}

.rail-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

/* ============================================================
   按钮
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 14px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.2;
  text-align: center;
  color: var(--paper);
  background: transparent;
  border: 2px solid var(--slate);
  cursor: pointer;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease),
              background-color 0.18s var(--ease), color 0.18s var(--ease),
              border-color 0.18s var(--ease);
}

.btn:hover { transform: translate(-2px, -2px); }
.btn:active { transform: none; box-shadow: none; }

.btn--primary {
  color: #04141C;
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 800;
  box-shadow: var(--shadow-hard-sm);
}

.btn--primary:hover {
  box-shadow: 6px 6px 0 rgba(4, 16, 26, 0.8);
}

.btn--ghost {
  color: var(--mist);
  border-color: #26465C;
}

.btn--ghost:hover {
  color: var(--paper);
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard-sm);
}

.btn--amber {
  color: #1A1000;
  background: var(--amber);
  border-color: var(--amber);
  box-shadow: var(--shadow-hard-sm);
}

.btn--outline {
  color: #0B2E33;
  border-color: #0B2E33;
}

.btn--outline:hover {
  color: var(--paper);
  background: #0B2E33;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  padding: clamp(36px, 5vw, 64px) var(--pad) 24px;
  color: var(--paper);
  background-color: var(--teal);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(199, 213, 224, 0.055) 0 1px,
    rgba(11, 46, 51, 0) 1px 64px
  );
  border-top: 2px solid var(--slate);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background-image: linear-gradient(
    90deg,
    var(--cyan) 0 20%,
    var(--amber) 20% 28%,
    var(--indigo) 28% 42%,
    var(--wine) 42% 49%,
    var(--slate) 49% 100%
  );
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
  max-width: 1240px;
  margin: 0 auto;
}

.footer-brand__mark {
  font-family: var(--font-display);
  font-size: clamp(28px, 4.6vw, 44px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.01em;
}

.footer-brand__mark::before {
  content: "//";
  margin-right: 0.36em;
  font-size: 0.55em;
  vertical-align: 0.18em;
  color: var(--cyan);
}

.footer-brand__line {
  max-width: 34ch;
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.footer-update {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--amber);
  background: rgba(246, 166, 35, 0.08);
  border: 1px solid rgba(246, 166, 35, 0.38);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
  gap: 24px;
}

.footer-col__title {
  margin-bottom: 12px;
  padding-left: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.18em;
  line-height: 1.4;
  color: var(--cyan);
  border-left: 3px solid var(--indigo);
}

.footer-col:nth-child(2) .footer-col__title { color: var(--mist); border-left-color: var(--wine); }
.footer-col:nth-child(3) .footer-col__title { color: var(--mist); border-left-color: var(--graphite); }

.footer-col__list {
  display: grid;
  gap: 2px;
}

.footer-link {
  display: inline-block;
  padding: 5px 0;
  font-size: 14px;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-link:hover {
  color: var(--paper);
  border-bottom-color: var(--cyan);
}

.footer-contact__list {
  display: grid;
  gap: 12px;
  margin-top: 4px;
}

.footer-contact__item {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

.footer-contact__key {
  display: block;
  margin-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
  color: var(--graphite);
}

.footer-contact__value { word-break: break-word; }

.footer-note {
  margin-top: 14px;
  padding-left: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--graphite);
  border-left: 2px solid var(--wine);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(199, 213, 224, 0.22);
}

.footer-legal__line,
.footer-legal__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

.footer-legal__meta { color: var(--amber); }

/* ============================================================
   通用页面组件
   ============================================================ */
.container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section { padding-block: clamp(32px, 5vw, 72px); }
.section--tight { padding-block: clamp(20px, 3vw, 36px); }

.surface-paper {
  color: var(--ink);
  background-color: var(--paper);
}

.surface-paper .lede { color: #3A4A57; }
.surface-paper .meta-mono { color: #5B6C7A; }

.display {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.012em;
}

.display--light {
  font-weight: 300;
  letter-spacing: 0.015em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: currentColor;
}

.index-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.lede {
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.75;
  color: var(--mist);
}

.meta-mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--graphite);
}

.stack { display: grid; gap: 12px; }

.rule {
  height: 2px;
  border: 0;
  background: var(--slate);
  margin-block: clamp(20px, 3vw, 32px);
}

/* 面包屑 */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  padding-block: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

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

.breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  color: #3D5B6E;
}

.breadcrumbs a {
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.breadcrumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

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

/* 面板与卡片 */
.panel {
  padding: clamp(18px, 2.4vw, 28px);
  color: var(--paper);
  background: var(--slate);
  border: 2px solid #24455A;
  box-shadow: var(--shadow-hard);
}

.panel--teal { background: var(--teal); }

.panel--paper {
  color: var(--ink);
  background: var(--paper);
  border-color: #C3D3DE;
  box-shadow: 6px 6px 0 #B9CBD8;
}

.card {
  padding: clamp(18px, 2.4vw, 28px);
  color: var(--paper);
  background: var(--slate);
  border: 2px solid #24455A;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease), border-color 0.18s var(--ease);
}

.card:hover,
.card:focus-within {
  transform: translate(-2px, -2px);
  border-color: var(--cyan);
  box-shadow: 8px 8px 0 rgba(4, 16, 26, 0.8);
}

/* 栅格 */
.grid {
  display: grid;
  gap: var(--gap);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(215px, 1fr)); }

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  line-height: 1.4;
  color: var(--cyan);
  border: 1px solid currentColor;
}

.tag--wine {
  color: #F0C4D0;
  background: rgba(109, 43, 63, 0.45);
  border-color: #8A3852;
}

.tag--indigo {
  color: #CFC4F5;
  background: rgba(74, 59, 124, 0.5);
  border-color: #5E4C99;
}

.tag--amber {
  color: #FFD79A;
  background: rgba(246, 166, 35, 0.14);
  border-color: var(--amber);
}

/* 提示条 */
.notice {
  padding: 14px 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
  background: rgba(246, 166, 35, 0.1);
  border: 1px solid rgba(246, 166, 35, 0.4);
  border-left: 4px solid var(--amber);
}

.surface-paper .notice { color: var(--ink); }

/* 时间轴 */
.timeline {
  display: grid;
  margin-left: 6px;
  border-left: 2px solid var(--slate);
}

.timeline__item {
  position: relative;
  padding: 0 0 18px 18px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 5px;
  width: 10px;
  height: 10px;
  background: var(--abyss);
  border: 2px solid var(--cyan);
}

.timeline__item[data-state="new"]::before {
  background: var(--amber);
  border-color: var(--amber);
}

.timeline__item:last-child { padding-bottom: 0; }

.timeline__date {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.timeline__body {
  margin-top: 4px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
}

/* 图片容器基类 */
.media {
  position: relative;
  overflow: hidden;
  background: var(--teal);
  border: 2px solid #24455A;
  box-shadow: var(--shadow-hard);
}

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

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }

.media__caption {
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--mist);
  border-top: 2px solid #24455A;
}

/* ---------- 滚动进度条（JS 注入） ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 120;
  background: rgba(8, 26, 41, 0.55);
  pointer-events: none;
}

.scroll-progress__bar {
  width: 0;
  height: 100%;
  background-image: linear-gradient(90deg, var(--cyan), var(--amber));
  transition: width 0.1s linear;
}

/* ---------- 显现 ---------- */
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.42s var(--ease), transform 0.42s var(--ease);
}

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

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 720px) {
  .footer__inner {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .footer-brand { grid-column: 1 / -1; }

  .footer-legal { grid-column: 1 / -1; }
}

@media (min-width: 960px) {
  body { padding-left: var(--rail-w); }

  .site-header {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--rail-w);
    height: auto;
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    min-height: 0;
    padding: 0 0 16px;
    overflow-y: auto;
    overscroll-behavior: contain;
    border-bottom: 0;
    border-right: 2px solid var(--slate);
  }

  .rail-top {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    width: 100%;
    padding: 16px 16px 14px;
    border-bottom: 2px solid var(--slate);
  }

  .brand__name { font-size: 18px; }

  .nav-toggle { display: none; }

  .rail-nav {
    position: static;
    display: block;
    inset: auto;
    flex: 1 1 auto;
    padding: 16px 16px 8px;
    overflow: visible;
    background-image: none;
    border-top: 0;
    animation: none;
  }

  .rail-nav__caption { font-size: 9.5px; }

  .rail-nav__list { gap: 2px; margin-top: 12px; }

  .rail-nav__link {
    grid-template-columns: 24px 1fr;
    gap: 8px;
    padding: 9px 8px;
    font-size: 13.5px;
  }

  .rail-nav__link[aria-current="page"]::after {
    right: 6px;
    padding: 1px 4px;
    font-size: 8px;
  }

  .rail-panel {
    position: static;
    display: grid;
    margin-top: auto;
    padding: 14px 16px 4px;
    background: transparent;
    border-top: 2px solid var(--slate);
    border-top-color: var(--slate);
  }

  .rail-actions { grid-template-columns: 1fr; }

  .btn { width: 100%; }

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

@media (min-width: 1040px) {
  .footer__inner {
    grid-template-columns: 1.15fr 1.7fr 1fr;
    align-items: start;
  }

  .footer-brand { grid-column: auto; }
}

@media (max-width: 400px) {
  .rail-actions { grid-template-columns: 1fr; }
  .brand__meta { display: none; }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .btn:hover,
  .card:hover,
  .card:focus-within { transform: none; }

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

  .rail-panel__dot { animation: none; }
}