/* ==========================================================================
   ROR 电竞站 · 共享样式表 /assets/site.css
   深空黑底 × 霓虹竞技场：重置、变量、中文排版、页头页脚、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, table, caption {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

table { border-collapse: collapse; }

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

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

main { display: block; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 品牌色板 */
  --ink: #07090E;
  --slate: #1B2028;
  --slate-deep: #11151B;
  --graphite: #6E7681;
  --paper: #F2EDE4;
  --cyan: #00E5FF;
  --lava: #FF6B1A;
  --violet: #9B5DE5;
  --moss: #4F6B4A;
  --clay: #B85C38;
  --cyan-soft: #7FF3FF;

  /* 纸面专用深色（保证米白底上的对比度） */
  --clay-ink: #8F4423;
  --teal-ink: #0A6A78;

  /* 线条与状态 */
  --line-cyan: rgba(0, 229, 255, 0.22);
  --line-cyan-strong: rgba(0, 229, 255, 0.55);
  --line-steel: rgba(110, 118, 129, 0.28);
  --line-paper: rgba(20, 24, 29, 0.16);

  /* 字体 */
  --font-display: "Impact", "Haettenschweiler", "Arial Narrow", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 尺度 */
  --radius: 2px;
  --frame-x: clamp(14px, 3vw, 40px);
  --wrap: 1440px;
  --shadow-paper: 0 1px 0 rgba(0, 0, 0, 0.4), 0 22px 46px -32px rgba(0, 0, 0, 0.95);
  --glow-cyan: 0 0 0 1px rgba(0, 229, 255, 0.28), 0 0 26px -8px rgba(0, 229, 255, 0.55);
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    repeating-linear-gradient(115deg, rgba(255, 255, 255, 0.022) 0 1px, transparent 1px 8px),
    repeating-linear-gradient(0deg, rgba(0, 229, 255, 0.03) 0 1px, transparent 1px 4px);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.012em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

p { margin-bottom: 1em; }

strong { font-weight: 700; }

::selection {
  background: var(--cyan);
  color: #04121A;
}

:focus-visible {
  outline: 2px solid var(--cyan-soft);
  outline-offset: 3px;
  border-radius: 1px;
}

/* ---------- 4. 容器与框架 ---------- */
.container {
  width: min(var(--wrap), 100% - (2 * var(--frame-x)));
  margin-inline: auto;
}

/* 页面外壳：两侧固定霓虹细线，让导航成为页面边框的一部分 */
.site-frame { position: relative; }

.site-frame::before,
.site-frame::after {
  content: "";
  position: fixed;
  top: 0;
  bottom: 0;
  width: 1px;
  z-index: 30;
  pointer-events: none;
  background: linear-gradient(180deg,
      rgba(0, 229, 255, 0.45),
      rgba(155, 93, 229, 0.22) 50%,
      rgba(255, 107, 26, 0.32));
}

.site-frame::before { left: 6px; }
.site-frame::after { right: 6px; }

@media (max-width: 700px) {
  .site-frame::before,
  .site-frame::after { display: none; }
}

/* ---------- 5. 跳至主内容 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 50%;
  transform: translate(-50%, -180%);
  z-index: 120;
  padding: 10px 20px;
  background: var(--cyan);
  color: #04121A;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: var(--radius);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

/* ---------- 6. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7, 9, 14, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-cyan);
}

.header-frame {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 24px);
  width: min(var(--wrap), 100% - (2 * var(--frame-x)));
  margin-inline: auto;
  min-height: 76px;
  padding: 6px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand__glyph {
  font-family: var(--font-display);
  font-size: 21px;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--cyan);
  padding: 7px 10px 6px;
  border-radius: 1px;
  box-shadow: 0 0 24px -8px var(--cyan);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand__line {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
  transition: color 0.16s ease;
}

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

.brand:hover .brand__line { color: var(--cyan-soft); }

.brand__spine {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  max-height: 62px;
  overflow: hidden;
  margin-left: 2px;
  padding-left: 8px;
  border-left: 1px solid var(--line-cyan);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  color: rgba(110, 118, 129, 0.9);
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 10px 14px;
  border: 1px solid var(--line-cyan);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan-soft);
  transition: background 0.16s ease, border-color 0.16s ease;
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--cyan);
  transition: transform 0.22s ease, opacity 0.18s ease;
}

.nav-toggle[aria-expanded="true"] {
  background: rgba(0, 229, 255, 0.14);
  border-color: var(--line-cyan-strong);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.nav-toggle:active { transform: translateY(1px); }

/* 导航 */
.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(4px, 1vw, 14px);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0px, 0.5vw, 6px);
}

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 12px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(242, 237, 228, 0.78);
  transition: color 0.16s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 5px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s ease;
}

.nav-link:hover { color: var(--cyan-soft); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  color: var(--cyan);
  background: rgba(0, 229, 255, 0.07);
}

.nav-link[aria-current="page"]::after { transform: scaleX(1); }

/* 熔岩橙胶囊入口 */
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--lava);
  color: #14060B;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  white-space: nowrap;
  box-shadow: 0 0 24px -10px var(--lava);
  transition: background 0.16s ease, transform 0.12s ease;
}

.nav-cta:hover { background: #FF8340; transform: translateY(-1px); }
.nav-cta:active { transform: translateY(1px); }

.nav-cta__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #14060B;
  animation: ror-pulse 1.8s ease-in-out infinite;
}

@keyframes ror-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.7); }
}

/* 顶部滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 55%, var(--lava));
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.6);
  pointer-events: none;
}

/* ---------- 7. 页脚（米白纸面横带） ---------- */
.site-footer { margin-top: clamp(56px, 9vw, 120px); }

.footer-sheet {
  background-color: var(--paper);
  background-image: repeating-linear-gradient(0deg, rgba(20, 24, 29, 0.05) 0 1px, transparent 1px 7px);
  color: #22272E;
  border-top: 3px solid var(--cyan);
  box-shadow: 0 -20px 60px -42px rgba(0, 229, 255, 0.6);
  padding: clamp(30px, 4vw, 56px) 0 clamp(18px, 2vw, 28px);
}

.footer-masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 24px;
  padding-bottom: clamp(18px, 2.4vw, 28px);
  border-bottom: 1px solid var(--line-paper);
}

.footer-brand {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1;
  letter-spacing: 0.03em;
  color: #12161B;
  margin: 0;
}

.footer-slogan {
  font-size: 14px;
  line-height: 1.7;
  color: #4C545E;
  max-width: 46ch;
  margin: 0;
}

.footer-stamp {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--paper);
  background: var(--clay);
  padding: 6px 11px;
  border-radius: 1px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 2.6vw, 40px);
  padding: clamp(24px, 3vw, 40px) 0;
}

.footer-col__title {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--clay-ink);
  padding-bottom: 8px;
  margin-bottom: 12px;
  border-bottom: 2px solid rgba(184, 92, 56, 0.35);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
}

.footer-list a {
  color: #22272E;
  border-bottom: 1px solid rgba(34, 39, 46, 0.22);
  padding-bottom: 1px;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.footer-list a:hover {
  color: var(--clay-ink);
  border-bottom-color: var(--clay-ink);
}

.footer-list--plain li {
  color: #3A424C;
  font-size: 13.5px;
  line-height: 1.7;
}

.footer-key {
  display: inline-block;
  min-width: 3.4em;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--clay-ink);
}

.footer-legal-line {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: #4C545E;
}

.footer-note {
  margin-top: 14px;
  margin-bottom: 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: #59616B;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  justify-content: space-between;
  align-items: center;
  padding-top: 18px;
  border-top: 1px solid var(--line-paper);
  font-size: 12.5px;
  color: #4C545E;
}

.footer-copyright {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #22272E;
}

.footer-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
}

.footer-sheet a:focus-visible {
  outline: 2px solid var(--teal-ink);
  outline-offset: 2px;
}

/* ---------- 8. 章节编号体系 ---------- */
.sec {
  position: relative;
  padding: clamp(40px, 7vw, 96px) 0;
}

.sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2vw, 28px);
  align-items: start;
  margin-bottom: clamp(20px, 3vw, 40px);
}

.sec-num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 64px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--clay);
}

.sec-title {
  font-size: clamp(24px, 2.6vw, 38px);
  font-weight: 700;
  line-height: 1.25;
}

.sec-kicker {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.sec-sub {
  margin-top: 8px;
  margin-bottom: 0;
  max-width: 62ch;
  font-size: 15px;
  color: rgba(242, 237, 228, 0.66);
}

.display {
  font-family: var(--font-display);
  font-size: clamp(40px, 7vw, 110px);
  font-weight: 400;
  line-height: 0.98;
  letter-spacing: 0.01em;
  color: var(--paper);
  -webkit-text-stroke: 2px var(--cyan);
  text-shadow: 0 0 30px rgba(0, 229, 255, 0.35);
}

.annot {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--graphite);
}

/* ---------- 9. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(14px, 2vw, 26px);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.grid--7-3 {
  grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  gap: clamp(20px, 3vw, 44px);
  align-items: start;
}

@media (max-width: 980px) {
  .grid--7-3 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 10. 卡片（专题研究板） ---------- */
.card {
  position: relative;
  padding: clamp(16px, 2vw, 26px);
  background: linear-gradient(180deg, rgba(27, 32, 40, 0.96), rgba(17, 21, 27, 0.96));
  border: 1px solid var(--line-steel);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.card:hover {
  border-color: var(--line-cyan-strong);
  transform: translateY(-4px);
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.16), 0 26px 52px -32px rgba(0, 229, 255, 0.65);
}

.card--tilt { transform: rotate(-0.8deg); }
.card--tilt:hover { transform: rotate(-0.8deg) translateY(-4px); }

.card__title {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 8px;
}

.card__sum {
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(242, 237, 228, 0.78);
  margin-bottom: 12px;
}

.card__edge,
.card__terms,
.card__more {
  font-size: 13px;
  line-height: 1.75;
  color: rgba(242, 237, 228, 0.6);
  padding-top: 10px;
  margin-top: 10px;
  border-top: 1px dashed rgba(110, 118, 129, 0.35);
  margin-bottom: 0;
}

.card__edge strong,
.card__terms strong,
.card__more strong {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin-right: 6px;
}

/* ---------- 11. 指标与标签 ---------- */
.metric {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.metric__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.05;
  color: var(--cyan);
}

.metric__unit {
  font-size: 0.6em;
  margin-left: 4px;
  color: var(--graphite);
}

.metric__label {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: rgba(242, 237, 228, 0.6);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  border: 1px solid currentColor;
  border-radius: 999px;
  white-space: nowrap;
}

.tag--violet { color: var(--violet); }
.tag--lava { color: var(--lava); }
.tag--clay { color: var(--clay); }
.tag--moss {
  color: #0D1410;
  background: var(--moss);
  border-color: var(--moss);
}

/* ---------- 12. 索引表 ---------- */
.index-table {
  width: 100%;
  font-size: 14.5px;
}

.index-table caption {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--graphite);
  padding-bottom: 10px;
}

.index-table thead th {
  position: sticky;
  top: 80px;
  z-index: 2;
  background: #0D1117;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  font-weight: 500;
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line-cyan);
}

.index-table td {
  padding: 11px 12px;
  border-bottom: 1px solid rgba(110, 118, 129, 0.2);
  font-variant-numeric: tabular-nums;
  vertical-align: top;
}

.index-table tbody tr:nth-child(even) { background: rgba(27, 32, 40, 0.55); }
.index-table tbody tr:hover { background: rgba(0, 229, 255, 0.07); }

/* ---------- 13. 面板 / 正文 / 分隔 ---------- */
.panel {
  padding: clamp(16px, 2vw, 26px);
  background: rgba(27, 32, 40, 0.72);
  border: 1px solid var(--line-steel);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
}

.prose { max-width: 40em; }

.prose p {
  color: rgba(242, 237, 228, 0.82);
  margin-bottom: 1.1em;
}

.prose h2,
.prose h3 { margin: 1.6em 0 0.6em; }

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--line-cyan-strong), rgba(155, 93, 229, 0.35) 55%, rgba(255, 107, 26, 0.4));
  margin: clamp(24px, 4vw, 48px) 0;
}

/* ---------- 14. 面包屑 ---------- */
.breadcrumb {
  margin-top: clamp(18px, 3vw, 32px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb li::after {
  content: "／";
  margin-left: 8px;
  color: rgba(110, 118, 129, 0.6);
}

.breadcrumb li:last-child::after { content: ""; }

.breadcrumb a { transition: color 0.16s ease; }
.breadcrumb a:hover { color: var(--cyan-soft); }
.breadcrumb [aria-current="page"] { color: var(--paper); }

/* ---------- 15. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid var(--line-cyan-strong);
  border-radius: var(--radius);
  background: rgba(0, 229, 255, 0.06);
  color: var(--cyan-soft);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease, transform 0.1s ease;
}

.btn:hover {
  background: rgba(0, 229, 255, 0.16);
  color: #EAFFFF;
}

.btn:active { transform: translateY(1px); }

.btn--lava {
  background: var(--lava);
  border-color: var(--lava);
  color: #14060B;
}

.btn--lava:hover {
  background: #FF8340;
  border-color: #FF8340;
  color: #14060B;
}

.btn--ghost {
  background: transparent;
  border-color: rgba(110, 118, 129, 0.5);
  color: rgba(242, 237, 228, 0.86);
}

.btn--ghost:hover {
  background: rgba(242, 237, 228, 0.06);
  color: var(--paper);
}

/* ---------- 16. 媒体容器（页面阶段放置图片） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  width: 100%;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  background-image: linear-gradient(135deg,
      rgba(0, 229, 255, 0.08),
      rgba(155, 93, 229, 0.12) 45%,
      rgba(255, 107, 26, 0.09));
  background-color: var(--slate-deep);
  box-shadow: var(--shadow-paper);
}

.media-frame[data-ratio="16/9"] { aspect-ratio: 16 / 9; }
.media-frame[data-ratio="4/3"] { aspect-ratio: 4 / 3; }
.media-frame[data-ratio="1/1"] { aspect-ratio: 1 / 1; }
.media-frame[data-ratio="3/4"] { aspect-ratio: 3 / 4; }

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.16) 0 1px, transparent 1px 3px);
}

.media-frame__cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

/* ---------- 17. 左侧浮动锚点栏 ---------- */
.rail {
  position: sticky;
  top: 96px;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-left: 14px;
  border-left: 1px solid var(--line-cyan);
}

.rail__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--graphite);
  text-transform: uppercase;
}

.rail-link {
  display: block;
  padding: 2px 0;
  font-size: 13px;
  color: rgba(242, 237, 228, 0.6);
  transition: color 0.16s ease, transform 0.16s ease;
}

.rail-link:hover {
  color: var(--cyan-soft);
  transform: translateX(3px);
}

.rail-link.is-active {
  color: var(--cyan);
}

.rail-link.is-active::before {
  content: "— ";
  color: var(--clay);
}

@media (max-width: 980px) {
  .rail {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px 16px;
    padding-left: 0;
    padding-top: 12px;
    border-left: 0;
    border-top: 1px solid var(--line-cyan);
  }
}

/* ---------- 18. 显现动效 ---------- */
.js-ready .reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ---------- 19. 响应式：平板与手机 ---------- */
@media (max-width: 1200px) {
  .brand__spine { display: none; }
}

@media (max-width: 960px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    margin-left: 0;
    padding: 6px var(--frame-x) 22px;
    background: linear-gradient(180deg, rgba(27, 32, 40, 0.99), rgba(7, 9, 14, 0.99));
    border-bottom: 1px solid var(--line-cyan);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    transition: max-height 0.35s ease, visibility 0.35s ease;
  }

  .site-nav[data-open] {
    max-height: 78vh;
    overflow-y: auto;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 14px 4px;
    font-size: 16px;
    border-bottom: 1px solid rgba(110, 118, 129, 0.2);
  }

  .nav-link::after { left: 4px; right: auto; width: 46px; bottom: 8px; }

  .nav-cta {
    margin: 16px 0 0;
    justify-content: center;
    width: 100%;
    padding: 13px 18px;
  }

  .index-table thead th { top: 70px; }
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-stamp { margin-left: 0; }
}

@media (max-width: 560px) {
  .header-frame { min-height: 66px; }
  .brand__tag { display: none; }
  .brand__glyph { font-size: 18px; padding: 6px 9px 5px; }
  .brand__line { font-size: 14px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .sec-head { grid-template-columns: minmax(0, 1fr); }
  .sec-num { font-size: 34px; }
}

/* ---------- 20. 动效偏好与打印 ---------- */
@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;
  }

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

@media print {
  .site-header,
  .site-footer,
  .scroll-progress,
  .rail { display: none; }

  body {
    background: #FFF;
    color: #000;
  }
}