/* ==========================================================================
   乐投中心 / site.css —— 共享外壳、基础排版与通用组件
   ========================================================================== */

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

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

html.is-nav-open { overflow: hidden; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-17);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

a { color: inherit; }

button { font: inherit; color: inherit; }

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

/* ------------------------------ 变量 ------------------------------ */
:root {
  --deep: #05192B;
  --hold: #0B2B44;
  --canvas: #F5F8FA;
  --desk: #E9E4DC;
  --signal: #FF6A2B;
  --ink-orange: #C2410C;
  --cyan: #2FE3D2;
  --ink: #16232E;
  --index: #8695A3;
  --line: #C9D4DC;
  --green: #57D08A;
  --amber: #E8B03A;

  --font-display: "Barlow Condensed", "Oswald", "Arial Narrow", "Helvetica Neue Condensed", system-ui, "PingFang SC", sans-serif;
  --font-head: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --fs-96: clamp(46px, 9vw, 96px);
  --fs-64: clamp(36px, 6.4vw, 64px);
  --fs-44: clamp(28px, 4.6vw, 44px);
  --fs-34: clamp(24px, 3vw, 34px);
  --fs-26: clamp(20px, 2.4vw, 26px);
  --fs-20: 20px;
  --fs-17: 17px;
  --fs-13: 13px;

  --rail-w: 96px;
  --maxw: 1320px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

@media (min-width: 961px) {
  body { padding-left: var(--rail-w); }
}

/* ------------------------------ 排版 ------------------------------ */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

h1 { font-size: var(--fs-34); }
h2 { font-size: var(--fs-26); }
h3 { font-size: var(--fs-20); }
h4 { font-size: var(--fs-17); }

p { max-width: 68ch; }

strong { font-weight: 700; }

/* ------------------------------ 工具类 ------------------------------ */
.u-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 56px);
}

.section { padding: clamp(36px, 6vw, 80px) 0; }
.section--canvas { background: var(--canvas); }
.section--desk { background: var(--desk); }
.section--deep { background: var(--deep); color: var(--canvas); }
.section--deep h1,
.section--deep h2,
.section--deep h3 { color: var(--canvas); }
.section--deep .lede { color: #C9D6E0; }
.section--deep .rule { border-color: rgba(201, 212, 220, 0.2); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.14em;
  color: var(--ink-orange);
  text-transform: uppercase;
}
.section--deep .eyebrow { color: var(--cyan); }

.display-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-64);
  line-height: 0.95;
  letter-spacing: -0.01em;
}

.index-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-64);
  line-height: 0.9;
  letter-spacing: -0.01em;
  color: var(--signal);
}

.lede {
  font-size: var(--fs-20);
  line-height: 1.6;
  max-width: 52ch;
}

.rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}

/* ------------------------------ 栅格 ------------------------------ */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}

.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

@media (max-width: 900px) {
  .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 12; }
}

/* ------------------------------ 跳转链接 ------------------------------ */
.skip-link {
  position: fixed;
  left: 8px;
  top: 8px;
  z-index: 200;
  padding: 10px 14px;
  background: var(--signal);
  color: #07131F;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.08em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 0.18s var(--ease);
}
.skip-link:focus { transform: none; }

/* ------------------------------ 头部：工具条 ------------------------------ */
.site-header {
  position: relative;
  z-index: 50;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 32px);
  min-height: 68px;
  padding: 8px clamp(16px, 3vw, 32px);
  background: rgba(5, 25, 43, 0.96);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(201, 212, 220, 0.18);
  color: var(--canvas);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  text-decoration: none;
  color: var(--canvas);
}

.brand__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 30px;
  height: 30px;
  border: 1px solid var(--signal);
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.02em;
}

.brand__body { display: block; min-width: 0; }

.brand__name {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-20);
  line-height: 1.2;
  letter-spacing: 0.06em;
}

.brand__line {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  line-height: 1.5;
  color: var(--index);
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.utility {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-left: auto;
}

.utility__link {
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--index);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.utility__link:hover { color: var(--canvas); border-color: var(--signal); }
.utility__link[aria-current="page"] { color: var(--canvas); border-color: var(--signal); }

.topbar__cta { flex: none; }

/* ------------------------------ 按钮 ------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid transparent;
  background: transparent;
  color: inherit;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.1em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.btn::after {
  content: "\2192";
  font-family: var(--font-mono);
  line-height: 1;
}
.btn--signal { background: var(--signal); border-color: var(--signal); color: #07131F; }
.btn--signal:hover { background: #FF8752; border-color: #FF8752; }
.btn--ghost { border-color: rgba(201, 212, 220, 0.42); color: var(--canvas); }
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn--ink { border-color: var(--ink); color: var(--ink); }
.btn--ink:hover { background: var(--ink); color: var(--canvas); }
.btn--quiet { border-color: var(--line); color: var(--ink-orange); }
.btn--quiet:hover { border-color: var(--ink-orange); }

/* ------------------------------ 头部：移动按钮 ------------------------------ */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid rgba(201, 212, 220, 0.34);
  color: var(--canvas);
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle__box {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}
.nav-toggle__box span {
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transition: transform 0.22s var(--ease);
}
.nav-toggle__box span:nth-child(1) { top: 0; }
.nav-toggle__box span:nth-child(2) { bottom: 0; }

.nav-toggle__text { display: block; }

.site-header[data-open] .nav-toggle__box span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.site-header[data-open] .nav-toggle__box span:nth-child(2) { transform: translateY(-4.5px) rotate(-45deg); }

/* ------------------------------ 头部：轨道导航 ------------------------------ */
.rail {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 60;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 16px 0 18px;
  background-color: var(--hold);
  background-image: linear-gradient(rgba(201, 212, 220, 0.055) 1px, transparent 1px);
  background-size: 100% 24px;
  border-right: 1px solid rgba(201, 212, 220, 0.16);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.rail__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(47, 227, 210, 0.6);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.02em;
}

.rail__note { display: none; }

.rail__list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: 100%;
  margin: auto 0;
}

.rail__item { display: flex; justify-content: center; width: 100%; }

.rail__link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 74px;
  padding: 10px 0;
  color: #93A4B2;
  text-decoration: none;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.rail__link:hover { color: var(--canvas); background: rgba(47, 227, 210, 0.08); }

.rail__num {
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--index);
}

.rail__label {
  writing-mode: vertical-rl;
  font-family: var(--font-head);
  font-size: var(--fs-13);
  line-height: 1.3;
  letter-spacing: 0.2em;
}

.rail__link[aria-current="page"] { color: var(--canvas); }
.rail__link[aria-current="page"] .rail__num { color: var(--signal); }
.rail__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -11px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--signal);
}

.rail__extra { display: none; }

.rail__foot {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding-top: 6px;
}

.rail__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 227, 210, 0.18);
}

.rail__status {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.14em;
  color: var(--index);
}

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(5, 25, 43, 0.72);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s var(--ease);
}
.site-header[data-open] .nav-scrim { opacity: 1; pointer-events: auto; }

/* ------------------------------ 阅读进度 ------------------------------ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 70;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}
@media (min-width: 961px) {
  .scroll-progress { left: var(--rail-w); }
}

/* ------------------------------ 页脚 ------------------------------ */
.site-footer {
  position: relative;
  overflow: hidden;
  padding-top: clamp(36px, 5vw, 64px);
  background: var(--deep);
  color: var(--canvas);
  border-top: 1px solid rgba(201, 212, 220, 0.18);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(201, 212, 220, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 212, 220, 0.05) 1px, transparent 1px);
  background-size: 64px 24px;
}
.footer__wrap { position: relative; z-index: 1; }

.footer__top {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr 0.9fr 0.9fr;
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(28px, 4vw, 48px);
}

.footer__mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(47, 227, 210, 0.6);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: var(--fs-13);
}

.footer__title {
  margin-top: 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-44);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--canvas);
}

.footer__tagline {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.1em;
  color: var(--cyan);
  max-width: none;
}

.footer__meta {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  line-height: 1.6;
  color: var(--index);
  max-width: none;
}

.footer__col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(201, 212, 220, 0.18);
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.12em;
  color: var(--index);
  max-width: none;
}
.footer__col-num { color: var(--signal); }

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-top: 12px;
}

.footer__link {
  font-size: var(--fs-17);
  line-height: 1.5;
  color: #D6DEE5;
  text-decoration: none;
  transition: color 0.18s var(--ease);
}
.footer__link:hover { color: var(--signal); }
.footer__link[aria-current="page"] { color: var(--signal); }

.footer__contact {
  display: grid;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid rgba(201, 212, 220, 0.18);
  border-bottom: 1px solid rgba(201, 212, 220, 0.18);
}

.footer__contact-lead {
  font-size: var(--fs-17);
  line-height: 1.6;
  color: #D6DEE5;
  max-width: 60ch;
}

.footer__contact-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.02em;
  color: var(--canvas);
  max-width: none;
}

.footer__contact-k {
  min-width: 2.4em;
  color: var(--index);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  padding: 18px 0 26px;
}

.footer__legal-line,
.footer__legal-note {
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.04em;
  color: var(--index);
  max-width: none;
}

/* ------------------------------ 面包屑 ------------------------------ */
.crumbs { margin: 18px 0 0; }

.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--index);
}

.crumbs__list li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.crumbs__list li::after {
  content: "/";
  color: rgba(134, 149, 163, 0.7);
}
.crumbs__list li:last-child::after { content: none; }

.crumbs__link {
  color: var(--ink-orange);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--ease);
}
.crumbs__link:hover { border-color: currentColor; }

.crumbs__current { color: var(--ink); }

.section--deep .crumbs__list { color: var(--index); }
.section--deep .crumbs__link { color: var(--cyan); }
.section--deep .crumbs__current { color: var(--canvas); }

/* ------------------------------ 状态徽标 / 图例 ------------------------------ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.5);
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--ink);
}
.tag--ok { border-color: rgba(87, 208, 138, 0.7); color: #1E7A4A; }
.tag--warn { border-color: rgba(232, 176, 58, 0.8); color: #8A5E00; }
.tag--index { border-color: rgba(22, 35, 46, 0.22); color: var(--index); }

.section--deep .tag {
  background: rgba(11, 43, 68, 0.6);
  border-color: rgba(201, 212, 220, 0.28);
  color: #D6DEE5;
}
.section--deep .tag--ok { border-color: rgba(87, 208, 138, 0.7); color: var(--green); }
.section--deep .tag--warn { border-color: rgba(232, 176, 58, 0.8); color: var(--amber); }

.dot {
  display: inline-block;
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
}
.dot--ok { background: var(--green); }
.dot--warn { background: var(--amber); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.04em;
  color: var(--index);
}
.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ------------------------------ 图片容器 ------------------------------ */
.figure {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 0;
}

.figure__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  background: var(--desk);
}

.figure__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure__caption {
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.04em;
  color: var(--index);
  max-width: none;
}

.figure--device .figure__frame {
  aspect-ratio: 9 / 19.5;
  max-width: 280px;
}
.figure--wide .figure__frame { aspect-ratio: 21 / 9; }
.figure--square .figure__frame { aspect-ratio: 1 / 1; }

.section--deep .figure__frame { border-color: rgba(201, 212, 220, 0.24); }
.section--deep .figure__caption { color: var(--index); }

/* ------------------------------ 手风琴 ------------------------------ */
.accordion {
  border-top: 1px solid var(--line);
}

.accordion__item {
  border-bottom: 1px solid var(--line);
}

.accordion__trigger {
  display: flex;
  align-items: baseline;
  gap: 16px;
  width: 100%;
  padding: 16px 0;
  background: none;
  border: 0;
  text-align: left;
  color: var(--ink);
  cursor: pointer;
  transition: color 0.18s var(--ease);
}
.accordion__trigger:hover { color: var(--ink-orange); }

.accordion__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-13);
  letter-spacing: 0.06em;
  color: var(--ink-orange);
}

.accordion__title {
  flex: 1;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--fs-20);
  line-height: 1.4;
}

.accordion__sign {
  flex: none;
  position: relative;
  display: block;
  width: 12px;
  height: 12px;
}
.accordion__sign::before,
.accordion__sign::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}
.accordion__sign::before { left: 0; right: 0; top: 5.5px; height: 1px; }
.accordion__sign::after { top: 0; bottom: 0; left: 5.5px; width: 1px; }

.accordion__trigger[aria-expanded="true"] .accordion__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.accordion__panel {
  height: auto;
  overflow: hidden;
  transition: height 0.24s var(--ease);
}

.accordion__inner {
  padding: 0 0 20px;
  color: var(--ink);
}
.accordion__inner p { max-width: 66ch; }

.section--deep .accordion,
.section--deep .accordion__item { border-color: rgba(201, 212, 220, 0.2); }
.section--deep .accordion__trigger { color: var(--canvas); }
.section--deep .accordion__trigger:hover { color: var(--cyan); }
.section--deep .accordion__num { color: var(--signal); }
.section--deep .accordion__inner { color: #C9D6E0; }

/* ------------------------------ 响应式：抽屉导航 ------------------------------ */
@media (max-width: 960px) {
  body { padding-left: 0; }

  .topbar {
    min-height: 60px;
    padding: 8px 16px;
    gap: 12px;
  }

  .brand__line { display: none; }
  .utility { display: none; }
  .topbar__cta { display: none; }
  .nav-toggle { display: inline-flex; }

  .rail {
    width: min(86vw, 340px);
    align-items: stretch;
    gap: 16px;
    padding: 22px 20px 26px;
    background-image: none;
    transform: translateX(-100%);
    visibility: hidden;
    transition: transform 0.24s var(--ease), visibility 0.24s linear;
    box-shadow: 24px 0 48px rgba(3, 14, 24, 0.4);
  }
  .site-header[data-open] .rail {
    transform: none;
    visibility: visible;
  }

  .rail__mark { align-self: flex-start; }

  .rail__note {
    display: block;
    padding-bottom: 14px;
    border-bottom: 1px solid rgba(201, 212, 220, 0.18);
    font-family: var(--font-mono);
    font-size: var(--fs-13);
    line-height: 1.6;
    letter-spacing: 0.02em;
    color: var(--index);
    max-width: none;
  }

  .rail__list {
    align-items: stretch;
    gap: 2px;
    margin: 0;
  }

  .rail__item { justify-content: flex-start; }

  .rail__link {
    flex-direction: row;
    align-items: baseline;
    justify-content: flex-start;
    gap: 14px;
    width: 100%;
    padding: 13px 10px;
    border-bottom: 1px solid rgba(201, 212, 220, 0.1);
  }

  .rail__label {
    writing-mode: horizontal-tb;
    font-size: var(--fs-17);
    letter-spacing: 0.08em;
  }

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

  .rail__foot {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 8px;
  }

  .rail__status {
    writing-mode: horizontal-tb;
    letter-spacing: 0.1em;
  }

  .rail__extra {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid rgba(201, 212, 220, 0.18);
  }

  .rail__extra-link {
    padding: 6px 0;
    font-family: var(--font-mono);
    font-size: var(--fs-13);
    letter-spacing: 0.08em;
    color: var(--index);
    text-decoration: none;
    transition: color 0.18s var(--ease);
  }
  .rail__extra-link:hover { color: var(--canvas); }

  .rail__cta { justify-content: center; }

  .footer__top { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .footer__top { grid-template-columns: 1fr; }
  .footer__title { font-size: var(--fs-34); }
  .footer__legal { flex-direction: column; }
}

/* ------------------------------ 动效降级 ------------------------------ */
@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;
  }
}