/* =========================================================
   9博看台 · 共享外壳样式 /assets/site.css
   深空黑底 + 框架式导航轴 + Bento 数据看板
   ========================================================= */

/* ---------- 1. reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
:where(h1, h2, h3, h4) { text-wrap: balance; }

/* ---------- 2. 变量 ---------- */
:root {
  --void: #05070C;
  --panel: #0C1018;
  --panel-2: #111826;
  --rail: #151B26;
  --ink: #E8F1F5;
  --ink-dim: #8FA3B0;
  --cyan: #00E5D0;
  --cyan-deep: #0A2A2A;
  --cyan-edge: #123A38;
  --amber: #FFB547;
  --magenta: #FF3D8B;
  --violet: #7C5CFF;
  --white: #FFFFFF;

  --rail-w: 168px;
  --bar-h: 40px;
  --bar-h-mobile: 32px;

  --gap: 6px;
  --gutter: 24px;
  --edge: 32px;
  --maxw: 1320px;

  --r-xl: 28px;
  --r-lg: 22px;
  --r-md: 16px;
  --r-pill: 999px;

  --f-display: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --f-text: "Source Han Sans SC", "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --fs-body: 17px;
  --t-fast: 120ms;
  --t-mid: 240ms;
  --t-slow: 520ms;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 3. 基础与中文排版 ---------- */
html { scroll-behavior: smooth; }

body {
  background-color: var(--void);
  color: var(--ink);
  font-family: var(--f-text);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  min-height: 100vh;
  padding-top: var(--bar-h);
  padding-left: var(--rail-w);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--f-display);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -.03em;
}
h1 { font-size: clamp(44px, 7vw, 104px); font-weight: 900; line-height: .98; }
h2 { font-size: clamp(24px, 3vw, 40px); }
h3 { font-size: 20px; letter-spacing: -.01em; }
h4 { font-size: 16px; letter-spacing: 0; }

p { max-width: 68ch; }
strong { font-weight: 700; color: var(--ink); }
small { font-size: 12px; color: var(--ink-dim); }

::selection { background: var(--cyan); color: #04120F; }

/* ---------- 4. 焦点与工具 ---------- */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 4px;
}

.mono,
.num,
[data-count-to] {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.kicker {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.src {
  display: block;
  margin-top: 16px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-dim);
  text-align: right;
}

#main-content {
  display: block;
  scroll-margin-top: calc(var(--bar-h) + 16px);
}

/* ---------- 5. skip link ---------- */
.skip-link {
  position: fixed;
  top: calc(var(--bar-h) + 10px);
  left: calc(var(--rail-w) + 14px);
  z-index: 200;
  transform: translateY(-220%);
  padding: 10px 20px;
  border-radius: var(--r-pill);
  background: var(--cyan);
  color: #04120F;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  transition: transform var(--t-mid) var(--ease);
}
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- 6. 头部：顶部标尺 ---------- */
.railframe { position: relative; z-index: 90; }

.railframe__rule {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  height: var(--bar-h);
  z-index: 90;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 18px;
  background: rgba(12, 16, 24, .94);
  border-bottom: 1px solid var(--rail);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.railframe__stamp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-dim);
  white-space: nowrap;
}

.railframe__pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 208, .14);
  animation: ledBreath 2.4s ease-in-out infinite;
}

.railframe__ticks {
  flex: 1 1 auto;
  min-width: 24px;
  height: 7px;
  background-image: repeating-linear-gradient(to right, rgba(143, 163, 176, .38) 0 1px, transparent 1px 12px);
  background-repeat: repeat-x;
  background-position: left bottom;
  background-size: 100% 7px;
}

.railframe__meta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ink-dim);
  white-space: nowrap;
}

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

.railframe__bar {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--rail);
  overflow: hidden;
  pointer-events: none;
}
.railframe__barfill {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
}

/* ---------- 7. 头部：移动导航按钮 ---------- */
.navtoggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--rail);
  background: var(--rail);
  color: var(--ink);
  font-size: 12px;
  letter-spacing: .1em;
  white-space: nowrap;
}
.navtoggle:hover { border-color: var(--cyan); color: var(--cyan); }
.navtoggle__bars { display: flex; flex-direction: column; gap: 3px; width: 14px; }
.navtoggle__bars i {
  display: block;
  height: 1.5px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform var(--t-mid) var(--ease), opacity var(--t-fast) linear;
}
.navtoggle__label { font-weight: 600; }
.navtoggle[aria-expanded="true"] .navtoggle__bars i:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.navtoggle[aria-expanded="true"] .navtoggle__bars i:nth-child(2) { opacity: 0; }
.navtoggle[aria-expanded="true"] .navtoggle__bars i:nth-child(3) { transform: translateY(-4.5px) rotate(-45deg); }

/* ---------- 8. 头部：左侧导航轴 ---------- */
.railtrack {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--rail-w);
  height: 100vh;
  z-index: 95;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 16px 14px 20px;
  background: var(--panel);
  border-right: 1px solid var(--rail);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.railtrack__top {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  margin: -16px -14px 0;
  padding: 0 14px;
  border-bottom: 1px solid var(--rail);
  flex: 0 0 auto;
}
.railtrack__led {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--amber);
}
.railtrack__state {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  white-space: nowrap;
}

.railtrack__brand {
  display: block;
  padding: 14px 12px;
  border-radius: var(--r-lg);
  background: var(--cyan-deep);
  border: 1px solid var(--cyan-edge);
  transition: border-color var(--t-fast) linear;
}
.railtrack__brand:hover { border-color: var(--cyan); }
.railtrack__mark {
  display: block;
  font-family: var(--f-mono);
  font-weight: 700;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--cyan);
}
.railtrack__title {
  display: block;
  margin-top: 8px;
  font-family: var(--f-display);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: .02em;
  color: var(--ink);
}
.railtrack__sub {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  line-height: 1.55;
  letter-spacing: .04em;
  color: var(--ink-dim);
}

.railtrack__list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.railtrack__item { min-width: 0; }

.railtrack__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: 14px;
  color: var(--ink-dim);
  transition: background var(--t-fast) linear, color var(--t-fast) linear, border-color var(--t-fast) linear;
}
.railtrack__link:hover { background: var(--rail); color: var(--ink); }
.railtrack__idx {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--ink-dim);
  opacity: .8;
}
.railtrack__label { font-weight: 500; }

.railtrack__link[aria-current="page"] {
  background: var(--rail);
  color: var(--ink);
  border-color: var(--cyan-edge);
}
.railtrack__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 18px;
  border-radius: 2px;
  background: var(--cyan);
  transform: translateY(-50%);
}
.railtrack__link[aria-current="page"] .railtrack__idx { color: var(--cyan); opacity: 1; }

.railtrack__foot {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--rail);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.railtrack__hint {
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--ink-dim);
  max-width: none;
}

/* ---------- 9. 复制胶囊 ---------- */
.copycap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--rail);
  background: var(--rail);
  color: var(--ink-dim);
  font-size: 12px;
  letter-spacing: .04em;
  transition: border-color var(--t-fast) linear, color var(--t-fast) linear, background var(--t-fast) linear;
}
.copycap:hover { border-color: var(--cyan); color: var(--cyan); }
.copycap.is-done {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04120F;
  font-weight: 700;
}
.copycap__text { display: inline-block; }

/* ---------- 10. 页脚 ---------- */
.deckfoot {
  position: relative;
  margin-top: 72px;
  background: var(--panel);
  border-top: 1px solid var(--rail);
}
.deckfoot::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 7px;
  background-image: repeating-linear-gradient(to right, rgba(143, 163, 176, .34) 0 1px, transparent 1px 16px);
  background-repeat: repeat-x;
  background-position: left top;
  background-size: 100% 7px;
  pointer-events: none;
}

.deckfoot__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 60px var(--edge) 0;
}

.deckfoot__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.1fr;
  gap: 32px;
  padding-bottom: 44px;
}

.deckfoot__brand { min-width: 0; }
.deckfoot__mark {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: -.02em;
  color: var(--ink);
}
.deckfoot__note {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--ink-dim);
  max-width: 36ch;
}

.deckfoot__contact {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.deckfoot__cline {
  display: flex;
  align-items: baseline;
  gap: 10px;
  max-width: none;
}
.deckfoot__ckey {
  flex: 0 0 auto;
  min-width: 40px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan);
}
.deckfoot__cval {
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--ink);
  word-break: break-all;
}
.deckfoot__copy { margin-top: 18px; max-width: none; }

.deckfoot__col { min-width: 0; }
.deckfoot__colhead {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 18px;
}
.deckfoot__links {
  display: flex;
  flex-direction: column;
  gap: 11px;
}
.deckfoot__link {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  color: var(--ink);
  transition: color var(--t-fast) linear;
}
.deckfoot__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 1px;
  background: var(--cyan);
  opacity: .5;
  transform: translateY(-50%);
  transition: width var(--t-fast) linear, opacity var(--t-fast) linear;
}
.deckfoot__link:hover { color: var(--cyan); }
.deckfoot__link:hover::before { width: 11px; opacity: 1; }

.deckfoot__hours {
  margin-top: 18px;
  font-size: 12px;
  line-height: 1.75;
  color: var(--ink-dim);
  max-width: 26ch;
}

.deckfoot__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 28px;
  padding: 24px 0 38px;
  border-top: 1px solid var(--rail);
  font-size: 12px;
  color: var(--ink-dim);
}
.deckfoot__source {
  flex: 1 1 340px;
  line-height: 1.7;
  max-width: none;
}
.deckfoot__source a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(0, 229, 208, .4);
}
.deckfoot__source a:hover { border-bottom-color: var(--cyan); }
.deckfoot__legal {
  font-family: var(--f-mono);
  letter-spacing: .04em;
  max-width: none;
}
.deckfoot__footnote {
  flex: 1 1 100%;
  font-size: 11px;
  opacity: .85;
  max-width: none;
}

/* ---------- 11. 容器与栅格 ---------- */
.sheet {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--edge);
  padding-right: var(--edge);
}
.sheet--prose { max-width: 62ch; }
.sheet--prose > p { max-width: none; }

.bentogrid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

/* ---------- 12. Bento 块 ---------- */
.block {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 22px;
  border-radius: var(--r-lg);
  border: 1px solid var(--rail);
  background: var(--panel);
}
.block--focus {
  background: var(--cyan-deep);
  border-color: var(--cyan-edge);
  padding: 28px;
}
.block__kicker {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.block__title {
  margin-top: 10px;
  font-family: var(--f-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--ink);
}
.block__body {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-dim);
  max-width: none;
}
.block__source {
  display: block;
  margin-top: auto;
  padding-top: 16px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-dim);
  text-align: right;
}

/* ---------- 13. 焦点数字与数据条 ---------- */
.stat {
  display: block;
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(32px, 4.5vw, 72px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--amber);
}
.stat--white { color: var(--white); }
.stat--cyan { color: var(--cyan); }
.stat__unit {
  margin-left: .28em;
  font-size: .45em;
  font-weight: 500;
  color: var(--ink-dim);
  letter-spacing: .02em;
}

.scale {
  position: relative;
  height: 6px;
  border-radius: 3px;
  background: var(--rail);
  overflow: hidden;
}
.scale__fill {
  display: block;
  height: 100%;
  border-radius: 3px;
  background: var(--cyan);
}
.scale__fill--amber { background: var(--amber); }
.scale__fill--violet { background: var(--violet); }

/* ---------- 14. 胶囊与分段标签 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--rail);
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ink-dim);
}
.chip--on { border-color: var(--cyan); color: var(--cyan); }
.chip--warm { border-color: rgba(255, 181, 71, .5); color: var(--amber); }

.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
  border-radius: var(--r-pill);
  border: 1px solid var(--rail);
  background: var(--panel);
}
.segmented__tab {
  padding: 9px 18px;
  border-radius: var(--r-pill);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--ink-dim);
  transition: background var(--t-fast) linear, color var(--t-fast) linear;
}
.segmented__tab:hover { color: var(--ink); }
.segmented__tab[aria-selected="true"],
.segmented__tab.is-active {
  background: var(--cyan-deep);
  color: var(--cyan);
}

[data-panel][hidden] { display: none; }

/* ---------- 15. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--r-pill);
  border: 1px solid var(--rail);
  background: var(--panel);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .04em;
  transition: border-color var(--t-fast) linear, color var(--t-fast) linear, background var(--t-fast) linear;
}
.btn:hover { border-color: var(--cyan); color: var(--cyan); }
.btn--key { background: var(--cyan); border-color: var(--cyan); color: #04120F; }
.btn--key:hover { background: transparent; color: var(--cyan); }

/* ---------- 16. 面包屑 ---------- */
.crumbs {
  padding-top: 28px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--ink-dim);
}
.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.crumbs li { display: flex; align-items: center; }
.crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--rail);
}
.crumbs a { color: var(--ink-dim); }
.crumbs a:hover { color: var(--cyan); }
.crumbs [aria-current="page"] { color: var(--ink); }

/* ---------- 17. 图形容器（供页面阶段放入图片/SVG） ---------- */
.mediaframe {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--rail);
  background-color: var(--cyan-deep);
  background-image:
    linear-gradient(rgba(0, 229, 208, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 208, .07) 1px, transparent 1px);
  background-size: 26px 26px, 26px 26px;
}
.mediaframe > img,
.mediaframe > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.mediaframe--tall { aspect-ratio: 4 / 5; }
.mediaframe--square { aspect-ratio: 1 / 1; }
.mediaframe--wide { aspect-ratio: 21 / 9; }
.mediaframe--ring {
  background-image: repeating-radial-gradient(circle at 50% 50%, rgba(0, 229, 208, .2) 0 1px, transparent 1px 22px);
}
.mediaframe--matrix {
  background-image:
    repeating-linear-gradient(90deg, rgba(0, 229, 208, .12) 0 12px, transparent 12px 18px),
    repeating-linear-gradient(0deg, rgba(0, 229, 208, .12) 0 12px, transparent 12px 18px);
}
.mediaframe__cap {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 12px;
  padding: 6px 12px;
  border-radius: var(--r-pill);
  background: rgba(5, 7, 12, .72);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--ink-dim);
}

/* ---------- 18. 动效 ---------- */
@keyframes ledBreath {
  0%, 100% { opacity: 1; }
  50% { opacity: .45; }
}
@keyframes heatPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .72; }
}
.panel-pulse { animation: heatPulse 1.2s ease-in-out infinite; }

.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
}
.has-js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 19. 响应式 ---------- */
@media (max-width: 1199px) {
  :root { --rail-w: 56px; --edge: 24px; }

  body { padding-left: var(--rail-w); }

  .railtrack { padding: 12px 8px 16px; gap: 14px; align-items: stretch; }
  .railtrack__top { height: 40px; margin: -12px -8px 0; padding: 0 8px; justify-content: center; }
  .railtrack__state { display: none; }
  .railtrack__brand { padding: 10px 6px; text-align: center; }
  .railtrack__title,
  .railtrack__sub { display: none; }
  .railtrack__mark { font-size: 22px; }
  .railtrack__link { justify-content: center; padding: 11px 4px; }
  .railtrack__label { display: none; }
  .railtrack__idx { font-size: 12px; opacity: 1; }
  .railtrack__link[aria-current="page"]::before { left: -8px; height: 16px; }
  .railtrack__foot { display: none; }

  .deckfoot__grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .deckfoot__brand { grid-column: span 3; }

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

@media (max-width: 767px) {
  :root { --fs-body: 16px; --edge: 18px; }

  body {
    padding-left: 0;
    padding-top: var(--bar-h-mobile);
    padding-bottom: 76px;
  }

  .skip-link {
    top: calc(var(--bar-h-mobile) + 8px);
    left: 12px;
  }

  #main-content { scroll-margin-top: calc(var(--bar-h-mobile) + 14px); }

  /* 顶部标尺 */
  .railframe__rule {
    left: 0;
    height: var(--bar-h-mobile);
    gap: 10px;
    padding: 0 12px;
  }
  .railframe__ticks { display: none; }
  .railframe__stamp { font-size: 10px; letter-spacing: .12em; }
  .railframe__meta { font-size: 11px; }
  .navtoggle { display: inline-flex; }

  /* 导航轴折叠为底部胶囊条 */
  .railtrack {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: auto;
    height: 64px;
    flex-direction: row;
    align-items: center;
    gap: 0;
    padding: 0 8px;
    border-right: 0;
    border-top: 1px solid var(--rail);
    background: rgba(12, 16, 24, .96);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    overflow: hidden;
  }
  .railtrack__top,
  .railtrack__brand,
  .railtrack__foot { display: none; }

  .railtrack__list {
    flex-direction: row;
    gap: 6px;
    width: 100%;
    padding: 8px 4px;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .railtrack__list::-webkit-scrollbar { display: none; }
  .railtrack__item { flex: 0 0 auto; }
  .railtrack__link {
    padding: 9px 14px;
    white-space: nowrap;
    flex: 0 0 auto;
  }
  .railtrack__label { display: inline; }
  .railtrack__idx { display: none; }
  .railtrack__link[aria-current="page"]::before { display: none; }
  .railtrack__link[aria-current="page"] { color: var(--cyan); }

  /* 展开态：整屏栏目面板 */
  .railtrack[data-open] {
    top: var(--bar-h-mobile);
    bottom: 0;
    height: auto;
    flex-direction: column;
    align-items: stretch;
    gap: 18px;
    padding: 20px 18px 28px;
    background: var(--void);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    overflow-y: auto;
  }
  .railtrack[data-open] .railtrack__brand {
    display: block;
    text-align: left;
    padding: 14px 12px;
  }
  .railtrack[data-open] .railtrack__title,
  .railtrack[data-open] .railtrack__sub { display: block; }
  .railtrack[data-open] .railtrack__mark { font-size: 34px; }
  .railtrack[data-open] .railtrack__list {
    flex-direction: column;
    width: auto;
    padding: 0;
    gap: 4px;
    overflow: visible;
  }
  .railtrack[data-open] .railtrack__link {
    justify-content: flex-start;
    padding: 12px 14px;
  }
  .railtrack[data-open] .railtrack__idx { display: inline; }
  .railtrack[data-open] .railtrack__foot {
    display: flex;
    margin-top: auto;
    padding-top: 18px;
  }

  /* 栅格全坍缩 */
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 12; }

  .block { padding: 18px; }
  .block--focus { padding: 22px; }
  .block__source { text-align: left; }

  /* 页脚 */
  .deckfoot { margin-top: 56px; }
  .deckfoot__inner { padding: 44px var(--edge) 0; }
  .deckfoot__grid {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-bottom: 32px;
  }
  .deckfoot__brand { grid-column: auto; }
  .deckfoot__note { max-width: none; }
  .deckfoot__hours { max-width: none; }
  .deckfoot__base { flex-direction: column; align-items: flex-start; gap: 10px; }
}

/* ---------- 20. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .has-js [data-reveal] { opacity: 1; transform: none; }
  .railframe__barfill { transition: none; }
}