/* ============================================================
   千赢体育VIP · 中文专区 — /assets/site.css
   共享外壳：左侧轨道导航 + 比分带页脚 + 通用组件
   ============================================================ */

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

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

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

ul, ol { list-style: none; }

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

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

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

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

/* ---------- 2. 设计变量 ---------- */
:root {
  --ink: #08160F;
  --ink-2: #0B1C14;
  --panel: #0C1E16;
  --field: #0E2033;
  --glass: rgba(20, 44, 36, 0.62);
  --edge: rgba(215, 255, 60, 0.16);
  --edge-soft: rgba(234, 243, 236, 0.09);
  --lime: #D7FF3C;
  --lime-dim: #9FBF2A;
  --flame: #FF5A36;
  --paper: #EAF3EC;
  --muted: #8FA3A8;
  --light: #F4F7F0;
  --indigo: #2B1F3A;
  --wine: #4A1B25;

  --rail-w: 88px;
  --pad-x: clamp(20px, 4vw, 56px);
  --radius: 12px;

  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  color: var(--paper);
  background-color: var(--ink);
  background-image:
    repeating-linear-gradient(90deg,
      rgba(215, 255, 60, 0.022) 0 1px,
      rgba(215, 255, 60, 0) 1px 76px),
    radial-gradient(130% 90% at 82% -12%, rgba(14, 32, 51, 0.92), rgba(8, 22, 15, 0) 62%);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

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

::selection {
  background: var(--lime);
  color: #08160F;
}

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

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 10px 18px;
  border-radius: 8px;
  background: var(--lime);
  color: #08160F;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
  transform: translateY(-180%);
  transition: transform 0.22s ease;
}

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

/* ---------- 5. 左侧轨道导航 ---------- */
.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 90;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, rgba(12, 30, 21, 0.95) 0%, rgba(8, 22, 15, 0.9) 100%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  border-right: 1px solid var(--edge-soft);
}

.rail__progress {
  position: absolute;
  top: 0;
  right: -1px;
  width: 2px;
  height: 100%;
  transform-origin: top center;
  transform: scaleY(var(--p, 0));
  background: linear-gradient(180deg, var(--lime), var(--lime-dim));
  box-shadow: 0 0 14px rgba(215, 255, 60, 0.6);
  pointer-events: none;
  z-index: 3;
}

.rail__top {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 18px 8px 14px;
  border-bottom: 1px solid var(--edge-soft);
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 7px;
  text-align: center;
}

.brand__mark {
  display: block;
  position: relative;
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: linear-gradient(150deg, rgba(215, 255, 60, 0.95), rgba(159, 191, 42, 0.5));
  box-shadow: 0 0 18px rgba(215, 255, 60, 0.4);
}

.brand__mark::after {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: 2px;
  background: #08160F;
}

.brand__mark--sm { width: 18px; height: 18px; border-radius: 5px; box-shadow: 0 0 12px rgba(215, 255, 60, 0.35); }
.brand__mark--sm::after { inset: 4px; }

.brand__name {
  font-size: 12px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--paper);
  letter-spacing: 0.01em;
}

.brand__en {
  display: block;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  color: var(--lime);
  margin-top: 2px;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.rail__version {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  color: var(--lime);
  border: 1px solid rgba(215, 255, 60, 0.35);
  border-radius: 999px;
  padding: 2px 8px;
  white-space: nowrap;
}

.rail__toggle {
  display: none;
  align-items: center;
  gap: 9px;
  background: transparent;
  border: 1px solid rgba(234, 243, 236, 0.18);
  border-radius: 8px;
  padding: 9px 12px;
  color: var(--paper);
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.rail__toggle:hover { border-color: rgba(215, 255, 60, 0.5); color: var(--lime); }

.rail__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
}

.rail__bars::before,
.rail__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 0.24s ease, opacity 0.24s ease;
}

.rail__bars::before { top: -6px; }
.rail__bars::after { top: 6px; }

.rail__toggle-text { font-size: 12px; letter-spacing: 0.16em; }

.rail__nav {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 10px 0;
  scrollbar-width: thin;
}

.rail__nav::-webkit-scrollbar { width: 4px; }
.rail__nav::-webkit-scrollbar-thumb { background: rgba(215, 255, 60, 0.25); border-radius: 2px; }

.rail__list { display: flex; flex-direction: column; }

.rail__link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 11px 4px;
  font-size: 12.5px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-left: 2px solid transparent;
  transition: color 0.22s ease, background-color 0.22s ease, border-color 0.22s ease;
}

.rail__link:hover {
  color: var(--paper);
  background: rgba(215, 255, 60, 0.07);
}

.rail__link[aria-current="page"] {
  color: var(--lime);
  border-left-color: var(--lime);
  background: linear-gradient(90deg, rgba(215, 255, 60, 0.16), rgba(215, 255, 60, 0));
}

.rail__idx {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: inherit;
  opacity: 0.66;
}

.rail__link[aria-current="page"] .rail__idx { opacity: 1; }

.rail__label { display: block; }

.rail__foot {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 12px 8px 14px;
  border-top: 1px solid var(--edge-soft);
}

.rail__cta {
  display: block;
  text-align: center;
  padding: 11px 6px;
  border-radius: 8px;
  background: var(--lime);
  color: #08160F;
  font-size: 11.5px;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: 0.05em;
  box-shadow: 0 0 0 1px rgba(215, 255, 60, 0.35), 0 10px 24px rgba(215, 255, 60, 0.16);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.rail__cta:hover { background: #E4FF6E; transform: translateY(-2px); }

.rail__status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--flame);
  box-shadow: 0 0 0 0 rgba(255, 90, 54, 0.55);
  animation: pulseDot 2.4s ease-out infinite;
}

@keyframes pulseDot {
  0% { box-shadow: 0 0 0 0 rgba(255, 90, 54, 0.55); }
  70% { box-shadow: 0 0 0 8px rgba(255, 90, 54, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 90, 54, 0); }
}

.rail__top-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 8px 4px;
  border-radius: 6px;
  border: 1px solid rgba(234, 243, 236, 0.14);
  background: transparent;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.12em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, color 0.2s ease, border-color 0.2s ease, visibility 0.25s;
}

.rail__top-btn[data-visible] { opacity: 1; visibility: visible; }

.rail__top-btn:hover { color: var(--lime); border-color: rgba(215, 255, 60, 0.45); }

/* ---------- 6. 页脚 ---------- */
.site-foot {
  position: relative;
  margin-top: clamp(56px, 9vw, 140px);
  background: linear-gradient(180deg, var(--field) 0%, #0A1A14 46%, var(--ink) 100%);
  border-top: 1px solid var(--edge);
  overflow: hidden;
}

.site-foot__strip {
  height: 6px;
  background-image: repeating-linear-gradient(90deg,
    rgba(215, 255, 60, 0.85) 0 26px,
    rgba(215, 255, 60, 0.1) 26px 52px,
    rgba(255, 90, 54, 0.7) 52px 66px,
    rgba(215, 255, 60, 0.1) 66px 92px);
  background-size: 92px 100%;
  animation: stripFlow 40s linear infinite;
}

@keyframes stripFlow {
  from { background-position: 0 0; }
  to { background-position: -92px 0; }
}

.site-foot__inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: clamp(36px, 5vw, 76px) var(--pad-x) clamp(24px, 3vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1.45fr) minmax(0, 1fr);
  gap: clamp(28px, 3.4vw, 56px);
}

.site-foot__logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.site-foot__lede {
  margin-top: 14px;
  max-width: 42ch;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

.foot-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.foot-stat {
  flex: 1 1 78px;
  min-width: 78px;
  padding: 11px 13px;
  border-radius: 9px;
  background: var(--glass);
  border: 1px solid var(--edge-soft);
}

.foot-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.foot-stat__cap {
  display: block;
  margin-top: 7px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.site-foot__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 2.6vw, 40px);
}

.foot-col__title {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--lime);
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid rgba(215, 255, 60, 0.2);
}

.foot-col__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.foot-link {
  position: relative;
  display: inline-block;
  font-size: 14px;
  color: var(--muted);
  transition: color 0.2s ease, padding-left 0.22s ease;
}

.foot-link::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--lime);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.foot-link:hover {
  color: var(--paper);
  padding-left: 14px;
}

.foot-link:hover::before { opacity: 1; }

.foot-contact__list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.foot-contact__item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.foot-contact__key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--lime-dim);
}

.foot-contact__val {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.foot-contact__val--note {
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--muted);
}

.site-foot__base {
  max-width: 1320px;
  margin: 0 auto;
  padding: 16px var(--pad-x) 30px;
  border-top: 1px solid rgba(234, 243, 236, 0.08);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
}

.site-foot__copy {
  font-size: 12.5px;
  color: var(--muted);
}

.site-foot__legal {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ---------- 7. 通用容器 / 网格 ---------- */
.container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 28px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- 8. 面包屑 ---------- */
.crumb { padding-top: 18px; }

.crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.crumb__item {
  display: inline-flex;
  align-items: center;
  gap: 9px;
}

.crumb__item + .crumb__item::before {
  content: "/";
  color: rgba(143, 163, 168, 0.45);
}

.crumb__link { color: var(--muted); transition: color 0.2s ease; }
.crumb__link:hover { color: var(--lime); }
.crumb__item--current { color: var(--paper); }

/* ---------- 9. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 9px;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--lime {
  background: var(--lime);
  color: #08160F;
  box-shadow: 0 12px 28px rgba(215, 255, 60, 0.18);
}

.btn--lime:hover { background: #E4FF6E; }

.btn--ghost {
  background: var(--glass);
  color: var(--paper);
  border-color: rgba(215, 255, 60, 0.28);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.btn--ghost:hover { border-color: var(--lime); color: var(--lime); }

.btn--light {
  background: var(--light);
  color: #0A1A12;
  border-color: #DCE6D8;
}

/* ---------- 10. 卡片层 ---------- */
.card {
  position: relative;
  padding: clamp(20px, 2.4vw, 30px);
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--edge-soft);
  transition: border-color 0.24s ease, transform 0.24s ease, box-shadow 0.24s ease;
}

.card:hover {
  border-color: rgba(215, 255, 60, 0.3);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.42);
}

.card--glass {
  background: var(--glass);
  border-color: var(--edge);
  -webkit-backdrop-filter: blur(12px) saturate(135%);
  backdrop-filter: blur(12px) saturate(135%);
}

.card--field { background: var(--field); }
.card--indigo { background: var(--indigo); }
.card--wine { background: var(--wine); }

.card--light {
  background: var(--light);
  color: #16281E;
  border-color: #DCE6D8;
}

.card--light .card__meta { color: #5C7264; }

.card__title {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.card__meta {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

/* ---------- 11. 区块头 / 索引标签 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(234, 243, 236, 0.1);
}

.section-head__title {
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 800;
  line-height: 1.25;
}

.section-head__note {
  max-width: 46ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--lime-dim);
}

/* ---------- 12. 数字与数据条 ---------- */
.num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.num--lime { color: var(--lime); }
.num--flame { color: var(--flame); }

.stat-bar {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stat-bar__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.stat-bar__val {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 56px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.stat-bar__track {
  position: relative;
  height: 6px;
  border-radius: 999px;
  background: rgba(234, 243, 236, 0.1);
  overflow: hidden;
}

.stat-bar__fill {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--lime-dim), var(--lime));
}

.stat-bar__cap {
  font-size: 12.5px;
  color: var(--muted);
}

/* ---------- 13. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid rgba(215, 255, 60, 0.3);
  background: rgba(215, 255, 60, 0.08);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.tag--flame {
  border-color: rgba(255, 90, 54, 0.42);
  background: rgba(255, 90, 54, 0.1);
  color: var(--flame);
}

.tag--muted {
  border-color: rgba(234, 243, 236, 0.14);
  background: rgba(234, 243, 236, 0.04);
  color: var(--muted);
}

/* ---------- 14. 正文与浅色阅读层 ---------- */
.prose {
  font-size: 16px;
  line-height: 1.75;
  color: #CFDCD2;
}

.prose p + p { margin-top: 16px; }

.prose h2 {
  margin: 34px 0 14px;
  font-size: 24px;
  font-weight: 800;
  color: var(--paper);
}

.prose h3 {
  margin: 26px 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

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

.prose li {
  position: relative;
  padding-left: 18px;
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime-dim);
}

.prose strong { color: var(--paper); font-weight: 700; }

.read-layer {
  padding: clamp(22px, 3vw, 46px);
  border-radius: 14px;
  background: var(--light);
  border: 1px solid #DCE6D8;
  color: #16281E;
}

.read-layer h2,
.read-layer h3 { color: #0B1C14; }
.read-layer .prose { color: #2A3D31; }
.read-layer .prose h2,
.read-layer .prose h3 { color: #0B1C14; }
.read-layer .prose li::before { background: #6E8A5A; }

/* ---------- 15. 图片占位容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
  border: 1px solid var(--edge-soft);
  background: linear-gradient(150deg, var(--field) 0%, #0A1A12 100%);
  aspect-ratio: 16 / 9;
}

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

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg,
    rgba(234, 243, 236, 0.05) 0 1px,
    rgba(234, 243, 236, 0) 1px 4px);
  mix-blend-mode: screen;
}

.media-frame__cap {
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 2;
  padding: 5px 11px;
  border-radius: 999px;
  background: rgba(8, 22, 15, 0.78);
  border: 1px solid rgba(215, 255, 60, 0.25);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
}

/* ---------- 16. 响应式：平板 / 手机 ---------- */
@media (max-width: 1100px) {
  .site-foot__inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .site-foot__brand { grid-column: 1 / -1; }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  body { padding-left: 0; }

  .rail {
    position: sticky;
    top: 0;
    left: auto;
    right: auto;
    bottom: auto;
    width: 100%;
    height: auto;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0 14px;
    border-right: 0;
    border-bottom: 1px solid rgba(234, 243, 236, 0.08);
    background: rgba(9, 24, 16, 0.94);
  }

  .rail__top {
    flex-direction: row;
    align-items: center;
    gap: 10px;
    padding: 11px 0;
    border-bottom: 0;
    min-width: 0;
  }

  .brand {
    flex-direction: row;
    align-items: center;
    gap: 8px;
    text-align: left;
  }

  .brand__mark { width: 20px; height: 20px; border-radius: 6px; }
  .brand__mark::after { inset: 5px; }

  .brand__name {
    display: flex;
    align-items: baseline;
    gap: 4px;
    font-size: 14px;
    line-height: 1.2;
  }

  .brand__en { display: inline; margin-top: 0; font-size: 10.5px; letter-spacing: 0.12em; }
  .brand__sub { display: none; }

  .rail__version { font-size: 9px; padding: 2px 7px; }

  .rail__toggle { display: inline-flex; }

  .rail__nav {
    order: 3;
    flex: 1 0 100%;
    max-height: 0;
    overflow: hidden;
    padding: 0;
    transition: max-height 0.3s ease;
  }

  .rail__nav[data-open],
  .rail[data-open] .rail__nav {
    max-height: min(72vh, 520px);
    overflow-y: auto;
    padding: 6px 0 4px;
    border-top: 1px solid rgba(234, 243, 236, 0.08);
  }

  .rail__list { flex-direction: column; gap: 2px; }

  .rail__link {
    flex-direction: row;
    justify-content: flex-start;
    gap: 12px;
    padding: 13px 10px;
    font-size: 15px;
    letter-spacing: 0.06em;
    border-left: 0;
    border-radius: 8px;
  }

  .rail__link[aria-current="page"] {
    border-left-color: transparent;
    background: rgba(215, 255, 60, 0.12);
    box-shadow: inset 3px 0 0 var(--lime);
  }

  .rail__idx { font-size: 10px; }

  .rail__foot {
    order: 4;
    flex: 1 0 100%;
    flex-direction: row;
    align-items: center;
    gap: 10px;
    max-height: 0;
    overflow: hidden;
    padding: 0;
    border-top: 0;
    transition: max-height 0.3s ease, padding 0.3s ease;
  }

  .rail__foot[data-open],
  .rail[data-open] .rail__foot {
    max-height: 180px;
    padding: 8px 0 16px;
    border-top: 1px solid rgba(234, 243, 236, 0.08);
  }

  .rail__cta { flex: 1 1 auto; font-size: 13px; padding: 11px 14px; }

  .rail__status { display: none; }

  .rail__top-btn { padding: 10px 13px; font-size: 12px; }

  .rail__progress {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 2px;
    transform-origin: left center;
    transform: scaleX(var(--p, 0));
  }

  #main-content { scroll-margin-top: 72px; }

  .site-foot__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 680px) {
  .site-foot__inner { grid-template-columns: minmax(0, 1fr); }
  .site-foot__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .site-foot__base { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 420px) {
  .site-foot__nav { grid-template-columns: minmax(0, 1fr); }
  .brand__name { font-size: 13px; }
}

@media (max-height: 680px) and (min-width: 901px) {
  .rail__top { padding: 12px 6px 10px; gap: 7px; }
  .brand__mark { width: 22px; height: 22px; }
  .rail__link { padding: 8px 4px; font-size: 12px; }
  .rail__foot { padding: 10px 8px; gap: 7px; }
}

/* ---------- 17. 动效降级 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .site-foot__strip { animation: none; }
  .pulse-dot { animation: none; box-shadow: 0 0 0 3px rgba(255, 90, 54, 0.22); }
}