/* =========================================================
   777游戏厅 · 全站共享样式  /assets/site.css
   深空黑 + 霓虹青 · 展览画册式布局 · 评测实验室精密感
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: #0B0D10;
}

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

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

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

a { color: inherit; }

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

table { border-collapse: collapse; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --ink: #0B0D10;
  --ink-2: #1A1D22;
  --ink-3: #12151A;
  --cream: #EFE9DE;
  --paper: #F2EDE4;

  --neon: #22E1D6;
  --violet: #8B5CF6;
  --amber: #FF7A2F;
  --moss: #7FA37B;
  --clay: #C4704F;
  --steel: #5B7FA6;

  --text: #F2EDE4;
  --text-dim: rgba(242, 237, 228, 0.68);
  --text-mute: rgba(242, 237, 228, 0.44);
  --ink-text: #14171B;
  --ink-text-dim: rgba(20, 23, 27, 0.72);

  --line: rgba(242, 237, 228, 0.13);
  --line-2: rgba(242, 237, 228, 0.3);
  --line-ink: rgba(20, 23, 27, 0.16);

  --rail-w: 96px;
  --bar-h: 40px;
  --shell-max: 1360px;
  --gutter: clamp(18px, 4vw, 56px);
  --radius: 2px;

  --font-display: "Impact", "Haettenschweiler", "Arial Narrow", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-ui: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui,
    -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "DejaVu Sans Mono",
    "Cascadia Mono", Consolas, "Courier New", monospace;
  --font-body: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", Georgia,
    "Times New Roman", serif;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --scroll-progress: 0;
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  position: relative;
  min-height: 100vh;
  padding-left: var(--rail-w);
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

/* 像素扫描线叠加层：仅装饰，永不拦截事件 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: repeating-linear-gradient(
    180deg,
    rgba(242, 237, 228, 0.026) 0,
    rgba(242, 237, 228, 0.026) 1px,
    rgba(0, 0, 0, 0) 1px,
    rgba(0, 0, 0, 0) 4px
  );
}

::selection {
  background: var(--neon);
  color: #06201F;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: 0.006em;
  color: var(--paper);
}

h1 { font-size: clamp(34px, 6.2vw, 74px); }
h2 { font-size: clamp(26px, 3.6vw, 42px); }
h3 { font-size: clamp(19px, 2.2vw, 26px); line-height: 1.3; }
h4 { font-size: clamp(16px, 1.5vw, 19px); line-height: 1.4; }

p { text-wrap: pretty; }

.u-mono,
code, kbd, samp, time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.u-dim { color: var(--text-dim); }

/* ---------- 4. 可访问性 ---------- */
:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
  box-shadow: 4px 4px 0 0 rgba(255, 122, 47, 0.68);
  border-radius: 1px;
}

:focus:not(:focus-visible) { outline: none; }

.section--cream :focus-visible,
.footer__legal :focus-visible {
  outline-color: var(--ink-text);
  box-shadow: 4px 4px 0 0 var(--amber);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

#main-content { display: block; }
#main-content:focus { outline: none; }

/* ---------- 5. 布局基元 ---------- */
.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(44px, 7vw, 110px); }
.section--tight { padding-block: clamp(26px, 4vw, 58px); }

.section--cream {
  background: var(--cream);
  color: var(--ink-text);
}
.section--cream h1,
.section--cream h2,
.section--cream h3,
.section--cream h4 { color: var(--ink-text); }

.section--edge {
  background: var(--ink-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 30px);
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.grid--7-5 { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.grid--8-4 { grid-template-columns: minmax(0, 8fr) minmax(0, 4fr); }
.grid--9-3 { grid-template-columns: minmax(0, 9fr) minmax(0, 3fr); }
.grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.col-3 { grid-column: span 3; }
.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-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: transparent;
  color: var(--paper);
  font-family: var(--font-ui);
  font-size: 13px;
  line-height: 1;
  letter-spacing: 0.12em;
  text-decoration: none;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease),
    color 0.18s var(--ease);
}

.btn--primary {
  background: var(--neon);
  border-color: var(--neon);
  color: #06201F;
  font-weight: 700;
}
.btn--primary:hover { background: #5CF0E7; border-color: #5CF0E7; }

.btn--ghost { color: var(--text-dim); }
.btn--ghost:hover { color: var(--paper); border-color: var(--neon); }

.section--cream .btn--ghost { color: var(--ink-text-dim); }
.section--cream .btn--ghost:hover { color: var(--ink-text); border-color: var(--ink-text); }

.btn--ink {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--cream);
}
.btn--ink:hover { background: #000; }

/* ---------- 7. 文本组件 ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--neon);
}
.eyebrow--ink { color: #0F7D76; }

.prose {
  max-width: 72ch;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(242, 237, 228, 0.86);
}
.prose h2 {
  margin: 2.1em 0 0.6em;
  font-size: clamp(22px, 2.8vw, 32px);
}
.prose h3 { margin: 1.8em 0 0.5em; }
.prose p { margin-bottom: 1.35em; }
.prose ul, .prose ol { margin: 0 0 1.35em; padding-left: 1.3em; }
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 0.45em; }
.prose a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 225, 214, 0.4);
}
.prose a:hover { border-bottom-color: var(--neon); }
.prose strong { color: var(--paper); font-weight: 700; }
.prose blockquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--violet);
  color: var(--text-dim);
}
.prose code {
  padding: 2px 6px;
  background: rgba(34, 225, 214, 0.09);
  border: 1px solid var(--line);
  color: var(--neon);
  font-size: 0.88em;
}

.section--cream .prose { color: var(--ink-text-dim); }
.section--cream .prose strong { color: var(--ink-text); }
.section--cream .prose a { color: #0F7D76; border-bottom-color: rgba(15, 125, 118, 0.4); }
.section--cream .prose code {
  background: rgba(20, 23, 27, 0.06);
  border-color: var(--line-ink);
  color: #0F7D76;
}

.note {
  padding-left: 12px;
  border-left: 2px solid var(--violet);
  font-family: var(--font-ui);
  font-size: 12px;
  line-height: 1.75;
  letter-spacing: 0.05em;
  color: var(--text-mute);
}
.note--vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  padding: 12px 0 0;
  border-left: 0;
  border-top: 2px solid var(--violet);
}

.rule {
  height: 1px;
  border: 0;
  margin: clamp(20px, 3vw, 38px) 0;
  background: var(--line);
}
.section--cream .rule { background: var(--line-ink); }

/* ---------- 8. 数据组件 ---------- */
.score {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(36px, 7vw, 72px);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--neon);
  text-shadow: 0 0 26px rgba(34, 225, 214, 0.35);
}
.score--sm { font-size: clamp(22px, 3vw, 34px); }
.score__unit {
  margin-left: 4px;
  font-size: 0.36em;
  letter-spacing: 0.12em;
  color: var(--text-mute);
  text-shadow: none;
}
.section--cream .score { color: #0F7D76; text-shadow: none; }
.section--cream .score__unit { color: rgba(20, 23, 27, 0.5); }

[data-cat="clay"] { --cat: var(--clay); }
[data-cat="moss"] { --cat: var(--moss); }
[data-cat="steel"] { --cat: var(--steel); }
[data-cat="violet"] { --cat: var(--violet); }
[data-cat="amber"] { --cat: var(--amber); }
[data-cat="neon"] { --cat: var(--neon); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 10px;
  border: 1px solid var(--line-2);
  border-radius: 1px;
  background: rgba(242, 237, 228, 0.03);
  color: var(--text-dim);
  font-family: var(--font-ui);
  font-size: 11px;
  line-height: 1;
  letter-spacing: 0.16em;
}
.tag::before {
  content: "";
  width: 6px;
  height: 6px;
  transform: rotate(45deg);
  background: var(--cat, var(--neon));
}
.tag--solid {
  background: var(--cat, var(--neon));
  border-color: transparent;
  color: #06201F;
}
.tag--solid::before { background: #06201F; }

.panel {
  padding: clamp(16px, 2vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.card {
  position: relative;
  display: block;
  padding: clamp(16px, 2vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
  color: inherit;
  text-decoration: none;
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease),
    background-color 0.18s var(--ease);
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--line-2);
  background: #1E222A;
}
.card:focus-within { border-color: rgba(34, 225, 214, 0.5); }

/* ---------- 9. 图片容器（供页面阶段放占位） ---------- */
.media {
  display: block;
  position: relative;
  border: 1px solid var(--line);
  background: var(--ink-3);
  overflow: hidden;
}

.media__frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background:
    repeating-linear-gradient(
      180deg,
      rgba(34, 225, 214, 0.05) 0,
      rgba(34, 225, 214, 0.05) 1px,
      rgba(0, 0, 0, 0) 1px,
      rgba(0, 0, 0, 0) 5px
    ),
    linear-gradient(135deg, #12151A 0%, #1A1D22 55%, #101318 100%);
}

.media--21x9 .media__frame { aspect-ratio: 21 / 9; }
.media--4x3 .media__frame { aspect-ratio: 4 / 3; }
.media--3x4 .media__frame { aspect-ratio: 3 / 4; }
.media--1x1 .media__frame { aspect-ratio: 1 / 1; }

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

.media__scan {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    180deg,
    rgba(11, 13, 16, 0.34) 0,
    rgba(11, 13, 16, 0.34) 1px,
    rgba(0, 0, 0, 0) 1px,
    rgba(0, 0, 0, 0) 4px
  );
}

.media__cap {
  margin-top: 10px;
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-mute);
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumbs {
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-mute);
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.breadcrumbs li { display: flex; align-items: center; gap: 8px; }
.breadcrumbs li::after { content: "／"; color: var(--line-2); }
.breadcrumbs li:last-child::after { content: none; }
.breadcrumbs a {
  color: var(--text-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.breadcrumbs a:hover { color: var(--neon); border-bottom-color: var(--neon); }
.breadcrumbs [aria-current="page"] { color: var(--paper); }

/* =========================================================
   11. 页头：左侧竖排轨道
   ========================================================= */
.site-header { position: relative; }

.skip-link {
  position: fixed;
  top: 10px;
  left: calc(var(--rail-w) + 14px);
  z-index: 120;
  padding: 10px 16px;
  background: var(--cream);
  border: 1px solid var(--ink-text);
  color: var(--ink-text);
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 0.18s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.nav-scrim { display: none; }

.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 60;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 16px 0 14px;
  border-right: 1px solid var(--line);
  background:
    repeating-linear-gradient(
      180deg,
      rgba(34, 225, 214, 0.045) 0,
      rgba(34, 225, 214, 0.045) 1px,
      rgba(0, 0, 0, 0) 1px,
      rgba(0, 0, 0, 0) 5px
    ),
    linear-gradient(180deg, #0B0D10 0%, #131820 50%, #0B0D10 100%);
}

.rail__progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  transform-origin: top center;
  transform: scaleY(var(--scroll-progress, 0));
  background: linear-gradient(180deg, var(--neon) 0%, var(--violet) 58%, var(--amber) 100%);
}

.rail__brand {
  padding: 2px 8px 16px;
  border-bottom: 1px solid var(--line);
  text-align: center;
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand__mark {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: 0.1em;
  color: var(--paper);
  transition: color 0.18s var(--ease);
}
.brand:hover .brand__mark { color: var(--neon); }

.brand__tagline {
  font-family: var(--font-ui);
  font-size: 9px;
  line-height: 1.7;
  letter-spacing: 0.12em;
  color: var(--violet);
  text-align: center;
}

.rail__nav {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 14px 4px;
  scrollbar-width: thin;
}

.nav-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

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

.nav-link {
  position: relative;
  display: block;
  padding: 11px 8px;
  border: 1px solid transparent;
  border-radius: 1px;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-ui);
  font-size: 12.5px;
  line-height: 1.15;
  letter-spacing: 0.2em;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}
.nav-link:hover {
  color: var(--paper);
  background: rgba(34, 225, 214, 0.07);
  border-color: var(--line-2);
}
.nav-link[aria-current="page"] {
  color: var(--neon);
  background: rgba(34, 225, 214, 0.1);
  border-color: rgba(34, 225, 214, 0.45);
}
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  bottom: -3px;
  left: 50%;
  width: 6px;
  height: 6px;
  transform: translateX(-50%) rotate(45deg);
  background: var(--neon);
}

.rail__actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px 10px 0;
  border-top: 1px solid var(--line);
}
.rail__actions .btn {
  width: 100%;
  padding: 10px 4px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
}

/* 移动端状态条与抽屉开关（桌面隐藏） */
.mobile-bar { display: none; }
.nav-toggle { display: none; }

/* =========================================================
   12. 页脚
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  border-top: 1px solid var(--line);
  background: var(--ink-2);
  color: var(--text);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  opacity: 0.85;
  background: linear-gradient(
    90deg,
    var(--neon) 0%,
    var(--violet) 42%,
    var(--amber) 78%,
    rgba(0, 0, 0, 0) 100%
  );
}

.footer__inner {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(38px, 5.4vw, 76px) var(--gutter) clamp(26px, 3.4vw, 46px);
}

.footer__grid {
  display: grid;
  gap: clamp(22px, 3vw, 46px);
  grid-template-columns: 1.7fr 1fr 1fr 1fr;
}

.footer__brand {
  font-family: var(--font-display);
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.footer__tagline {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--violet);
}

.footer__motto {
  margin-top: 14px;
  max-width: 26ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-dim);
}

.footer__col-title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3em;
  color: var(--text-mute);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer__link {
  position: relative;
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}
.footer__link:hover { color: var(--neon); }

.footer__link--cat { padding-left: 15px; }
.footer__link--cat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  transform: translateY(-50%) rotate(45deg);
  background: var(--cat, var(--neon));
}

.footer__contact {
  margin-top: clamp(28px, 4vw, 52px);
  padding-top: clamp(20px, 3vw, 34px);
  border-top: 1px solid var(--line);
}

.contact-list {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.contact-list__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.contact-list__key {
  font-family: var(--font-ui);
  font-size: 10.5px;
  letter-spacing: 0.28em;
  color: var(--text-mute);
}

.contact-list__val {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--paper);
  word-break: break-word;
}
.contact-list__val--text {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  color: var(--text-dim);
}

.footer__legal {
  border-top: 1px solid var(--line-ink);
  background: var(--cream);
  color: var(--ink-text);
}

.footer__legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 16px var(--gutter);
}

.footer__icp,
.footer__copy {
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: #414850;
}
.footer__copy { color: #5A626B; }

.footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.footer__legal-links a {
  color: var(--ink-text);
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-bottom: 1px solid rgba(20, 23, 27, 0.35);
}
.footer__legal-links a:hover {
  color: var(--clay);
  border-bottom-color: var(--clay);
}

/* ---------- 13. 滚动显现 ---------- */
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
html.has-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* =========================================================
   14. 响应式
   ========================================================= */
@media (max-width: 1023px) {
  .grid--7-5,
  .grid--8-4,
  .grid--9-3 { grid-template-columns: 1fr; }

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

  .footer__grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer__masthead { grid-column: 1 / -1; }
  .contact-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 899px) {
  body {
    padding-left: 0;
    padding-top: var(--bar-h);
  }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--bar-h);
    z-index: 80;
  }

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

  .mobile-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    height: var(--bar-h);
    padding-left: 14px;
    border-bottom: 1px solid var(--line);
    background: rgba(11, 13, 16, 0.96);
  }

  .mobile-bar__brand {
    flex: 0 0 auto;
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: var(--paper);
    white-space: nowrap;
  }

  .mobile-bar__label {
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--neon);
  }
  .mobile-bar__label::before {
    content: "／";
    margin-right: 6px;
    color: var(--violet);
  }

  .nav-toggle {
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: center;
    width: var(--bar-h);
    height: var(--bar-h);
    border-left: 1px solid var(--line);
    background: transparent;
  }

  .nav-toggle__bars,
  .nav-toggle__bars::before,
  .nav-toggle__bars::after {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--neon);
    transition: transform 0.18s var(--ease), opacity 0.18s var(--ease);
  }
  .nav-toggle__bars { position: relative; }
  .nav-toggle__bars::before,
  .nav-toggle__bars::after {
    content: "";
    position: absolute;
    left: 0;
  }
  .nav-toggle__bars::before { top: -6px; }
  .nav-toggle__bars::after { top: 6px; }

  .nav-toggle[aria-expanded="true"] .nav-toggle__bars { transform: rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
    top: 0;
    transform: rotate(-90deg);
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
    top: 0;
    opacity: 0;
  }

  .nav-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 65;
    background: rgba(11, 13, 16, 0.74);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.18s ease-out;
  }
  body.is-nav-open .nav-scrim {
    opacity: 1;
    pointer-events: auto;
  }

  .rail {
    inset: var(--bar-h) auto 0 0;
    width: min(84vw, 320px);
    padding: 20px 18px 18px;
    overflow-y: auto;
    border-right: 1px solid var(--line-2);
    box-shadow: 18px 0 40px rgba(0, 0, 0, 0.5);
    transform: translateX(-102%);
    visibility: hidden;
    transition: transform 0.2s var(--ease), visibility 0s linear 0.2s;
  }
  .rail[data-open] {
    transform: translateX(0);
    visibility: visible;
    transition: transform 0.2s var(--ease), visibility 0s linear 0s;
  }

  .rail__progress { display: none; }

  .rail__brand {
    padding: 0 0 16px;
    border-bottom: 1px solid var(--line);
    text-align: left;
  }

  .brand {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
  }
  .brand__mark {
    writing-mode: horizontal-tb;
    font-size: 20px;
    letter-spacing: 0.04em;
  }
  .brand__tagline { display: none; }

  .rail__nav {
    flex: 1 1 auto;
    padding: 16px 0;
    overflow: visible;
  }

  .nav-list {
    align-items: stretch;
    gap: 0;
    counter-reset: navidx;
  }

  .nav-item {
    display: block;
    width: auto;
    counter-increment: navidx;
  }

  .nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 13px 6px;
    border: 0;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    writing-mode: horizontal-tb;
    font-size: 15px;
    line-height: 1.5;
    letter-spacing: 0.06em;
    color: var(--text-dim);
  }
  .nav-link::before {
    content: counter(navidx, decimal-leading-zero);
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0;
    color: var(--text-mute);
  }
  .nav-link:hover {
    background: rgba(34, 225, 214, 0.08);
    border-color: var(--line);
    color: var(--paper);
  }
  .nav-link[aria-current="page"] {
    color: var(--neon);
    background: rgba(34, 225, 214, 0.09);
    border-color: var(--line);
    box-shadow: inset 3px 0 0 0 var(--neon);
  }
  .nav-link[aria-current="page"]::after { display: none; }
  .nav-link[aria-current="page"]::before { color: var(--neon); }

  .rail__actions {
    flex-direction: row;
    gap: 8px;
    padding: 16px 0 0;
  }
  .rail__actions .btn { flex: 1 1 0; }

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

@media (max-width: 639px) {
  .grid--thirds,
  .grid--halves { grid-template-columns: 1fr; }

  .col-3, .col-4, .col-5, .col-6,
  .col-7, .col-8, .col-9, .col-12 { grid-column: 1 / -1; }

  .footer__grid { grid-template-columns: 1fr; }
  .contact-list { grid-template-columns: 1fr; }
  .footer__legal-inner { justify-content: flex-start; }
}

@media (max-height: 760px) and (min-width: 900px) {
  .rail { padding-top: 12px; }
  .brand__tagline { display: none; }
  .brand__mark { font-size: 17px; }
  .nav-link { padding: 8px 7px; font-size: 12px; letter-spacing: 0.16em; }
  .rail__actions .btn { padding: 8px 4px; font-size: 11px; }
}

/* ---------- 15. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    transition-delay: 0s !important;
    scroll-behavior: auto !important;
  }

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

  .card:hover { transform: none; }
  .rail__progress { transform: scaleY(1); opacity: 0.4; }
}