/* ============================================================
   游戏888攻略 — 共享样式 /assets/site.css
   基调：深渊墨蓝底 + 街机霓虹锚点 + 手绘攻略地图质感
   ============================================================ */

/* ---------- 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, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  /* 色彩体系 */
  --ink: #070B14;
  --panel: #0E1726;
  --panel-2: #121E31;
  --line: #1E2C46;
  --paper: #EFE9DC;
  --mist: #9AA9C0;
  --cyan: #33E1E1;
  --magenta: #FF3D9A;
  --amber: #FFC24B;
  --alert: #FF6B5A;
  --grad-pixel: linear-gradient(90deg, #33E1E1 0%, #FF3D9A 52%, #FFC24B 100%);

  /* 字体栈 */
  --font-display: "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* 字号层级 160 / 96 / 56 / 34 / 24 / 18 / 15 / 13 */
  --fs-display: clamp(3.25rem, 10vw, 10rem);
  --fs-h1: clamp(2.25rem, 6vw, 6rem);
  --fs-h2: clamp(1.75rem, 3.6vw, 3.5rem);
  --fs-h3: clamp(1.375rem, 2.4vw, 2.125rem);
  --fs-h4: clamp(1.125rem, 1.6vw, 1.5rem);
  --fs-body: clamp(1rem, 1.05vw, 1.125rem);
  --fs-sm: 0.9375rem;
  --fs-xs: 0.8125rem;

  /* 结构尺寸 */
  --rail-w: 84px;
  --topbar-h: 64px;
  --measure: 34em;
  --gutter: clamp(20px, 4.6vw, 64px);
  --gap: clamp(16px, 2vw, 28px);
  --cell: 48px;

  --hair: 1px solid var(--line);
  --ease: cubic-bezier(0.32, 0.72, 0.24, 1);

  color-scheme: dark;
}

/* ---------- 3. 页面底座 ---------- */
body {
  min-height: 100vh;
  padding-left: var(--rail-w);
  padding-top: var(--topbar-h);
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(30, 44, 70, 0.34) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 44, 70, 0.34) 1px, transparent 1px);
  background-size: var(--cell) var(--cell);
  color: var(--mist);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 扫描线质感：低透明度、不拦截交互 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 400;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(255, 255, 255, 0.022) 0px,
    rgba(255, 255, 255, 0.022) 1px,
    transparent 1px,
    transparent 3px
  );
}

/* ---------- 4. 中文排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--paper);
  line-height: 1.1;
  letter-spacing: -0.01em;
}
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); font-weight: 800; }
h4 { font-size: var(--fs-h4); font-weight: 700; }

p { max-width: var(--measure); }
strong, b { color: var(--paper); font-weight: 700; }
em { font-style: normal; color: var(--amber); }
small { font-size: var(--fs-xs); }

::selection {
  background: var(--cyan);
  color: var(--ink);
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
:focus:not(:focus-visible) { outline: none; }

#main-content { scroll-margin-top: calc(var(--topbar-h) + 24px); }

/* ---------- 5. 通用工具与基础组件 ---------- */
.wrap {
  width: 100%;
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--narrow { max-width: 900px; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.panel-grid {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 268px), 1fr));
}

.stack {
  display: grid;
  gap: 4px;
}

.grid-field {
  background-image:
    linear-gradient(rgba(30, 44, 70, 0.62) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 44, 70, 0.62) 1px, transparent 1px);
  background-size: var(--cell) var(--cell);
}

.rule {
  height: 1px;
  background: var(--line);
  border: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
}

.coord {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--amber);
  border-bottom: 1px dashed rgba(255, 194, 75, 0.45);
  padding-bottom: 1px;
}

.pin {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--magenta);
  transform: rotate(45deg);
  box-shadow: 0 0 10px rgba(255, 61, 154, 0.7);
  flex: none;
}

.panel {
  position: relative;
  padding: clamp(20px, 2.6vw, 34px);
  background: var(--panel);
  border: var(--hair);
  transition: border-color 0.16s linear, background-color 0.16s linear;
}
.panel:hover { border-color: var(--cyan); }

.panel__index {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--amber);
}
.panel__title {
  margin-top: 8px;
  font-size: var(--fs-h4);
}
.panel__text {
  margin-top: 10px;
  font-size: var(--fs-sm);
  line-height: 1.7;
}

.link-fill {
  position: relative;
  color: var(--mist);
  transition: color 0.16s linear;
}
.link-fill::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.16s linear;
}
.link-fill:hover { color: var(--paper); }
.link-fill:hover::after { transform: scaleX(1); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  color: var(--mist);
}
.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.breadcrumb li + li::before {
  content: "/";
  color: var(--line);
}
.breadcrumb a {
  border-bottom: 1px solid transparent;
  transition: color 0.16s linear, border-color 0.16s linear;
}
.breadcrumb a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.breadcrumb [aria-current="page"] { color: var(--paper); }

/* 响应式图片容器（页面阶段放置 <img>） */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--panel-2);
  border: var(--hair);
  aspect-ratio: 16 / 10;
}
.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 > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.06) brightness(0.9) hue-rotate(-8deg);
  transition: transform 0.4s var(--ease);
}
.media-frame:hover > img { transform: scale(1.02); }

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(7, 11, 20, 0.22) 0px,
    rgba(7, 11, 20, 0.22) 1px,
    transparent 1px,
    transparent 4px
  );
}
.media-frame > figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 8px 14px;
  background: rgba(7, 11, 20, 0.86);
  border-top: var(--hair);
  border-right: var(--hair);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border: var(--hair);
  background: transparent;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  white-space: nowrap;
  transition: color 0.16s linear, border-color 0.16s linear, background-color 0.16s linear, box-shadow 0.16s linear;
}
.btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}
.btn-primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04121a;
  font-weight: 700;
  box-shadow: 0 0 0 1px rgba(51, 225, 225, 0.22), 0 0 22px rgba(51, 225, 225, 0.2);
}
.btn-primary:hover {
  background: var(--paper);
  border-color: var(--paper);
  color: var(--ink);
  box-shadow: none;
}
.btn-ghost {
  border-color: var(--line);
  color: var(--mist);
}
.btn-ghost:hover {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---------- 7. 显现（页面用 data-reveal） ---------- */
[data-reveal] { transition: opacity 0.34s var(--ease), transform 0.34s var(--ease); }
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
}
html.js [data-reveal="shown"] {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 8. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: calc(var(--rail-w) + 10px);
  z-index: 500;
  padding: 10px 16px;
  background: var(--cyan);
  color: #04121a;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  transition: top 0.16s linear;
}
.skip-link:focus { top: 10px; }

/* ---------- 9. 站点头部 ---------- */
.site-header { position: relative; z-index: 140; }

/* 9.1 左侧坐标轴 */
.rail {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 152;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 14px 0 20px;
  overflow-x: hidden;
  overflow-y: auto;
  background: linear-gradient(180deg, rgba(51, 225, 225, 0.07) 0%, rgba(7, 11, 20, 0) 26%), var(--panel);
  border-right: var(--hair);
}
.rail::after {
  content: "";
  position: absolute;
  top: 0;
  right: -1px;
  bottom: 0;
  width: 9px;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    to bottom,
    var(--line) 0,
    var(--line) 1px,
    transparent 1px,
    transparent var(--cell)
  );
  opacity: 0.85;
}

.rail-head {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  width: 46px;
  padding: 8px 0 10px;
  border: var(--hair);
  background: var(--ink);
}
.rail-head-mark {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-shadow: 0 0 10px rgba(51, 225, 225, 0.6);
}
.rail-head-code {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--paper);
}

/* 9.2 纵向导航 */
.rail-nav {
  flex: 1 1 auto;
  min-height: 0;
}
.rail-nav-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}
.rail-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  width: 64px;
  padding: 9px 5px;
  border: 1px solid transparent;
  color: var(--mist);
  transition: color 0.16s linear, border-color 0.16s linear, background-color 0.16s linear;
}
.rail-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--amber);
}
.rail-label {
  writing-mode: vertical-rl;
  font-size: 13px;
  letter-spacing: 0.12em;
  line-height: 1.2;
}
.rail-link:hover {
  color: var(--paper);
  border-color: var(--cyan);
  background: rgba(51, 225, 225, 0.07);
}
.rail-link[aria-current="page"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  font-weight: 700;
}
.rail-link[aria-current="page"] .rail-index { color: rgba(7, 11, 20, 0.72); }

/* 9.3 顶部细线框 */
.topbar {
  position: fixed;
  top: 0;
  right: 0;
  left: var(--rail-w);
  z-index: 148;
  height: var(--topbar-h);
  background: rgba(7, 11, 20, 0.9);
  border-bottom: var(--hair);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.topbar-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 100%;
  padding-inline: var(--gutter);
}

.topbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: none;
}
.topbar-brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  padding: 3px 6px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
  box-shadow: 0 0 14px rgba(51, 225, 225, 0.3);
}
.topbar-brand-name {
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 1.2vw, 1.125rem);
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--paper);
  text-shadow: 0 0 22px rgba(51, 225, 225, 0.18);
  transition: color 0.16s linear;
}
.topbar-brand:hover .topbar-brand-name { color: var(--cyan); }

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}
.topbar-signature {
  max-width: none;
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
  white-space: nowrap;
}

.topbar-progress {
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--grad-pixel);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

.legend-toggle {
  padding: 8px 12px;
  border: var(--hair);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
  white-space: nowrap;
  transition: color 0.16s linear, background-color 0.16s linear, border-color 0.16s linear;
}
.legend-toggle:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}
.legend-toggle[aria-expanded="true"] {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--ink);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: var(--hair);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  transition: color 0.16s linear, background-color 0.16s linear, border-color 0.16s linear;
}
.nav-toggle:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}
.nav-toggle[aria-expanded="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}
.nav-toggle-icon {
  position: relative;
  display: inline-block;
  width: 14px;
  height: 8px;
  border-top: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
}
.nav-toggle-icon::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: currentColor;
  transform: translateY(-50%);
}

/* 9.4 图例面板 */
.legend-panel {
  position: fixed;
  top: var(--topbar-h);
  left: var(--rail-w);
  z-index: 146;
  width: min(392px, calc(100vw - var(--rail-w) - 16px));
  max-height: calc(100vh - var(--topbar-h) - 20px);
  overflow-y: auto;
  padding: 22px clamp(18px, 2vw, 26px) 28px;
  background: var(--panel-2);
  border-left: var(--hair);
  border-right: var(--hair);
  border-bottom: var(--hair);
  opacity: 0;
  visibility: hidden;
  transform: translateX(-14px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s;
}
.site-header[data-legend-open="true"] .legend-panel {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}
.legend-title {
  font-size: var(--fs-h4);
  font-weight: 800;
}
.legend-intro {
  max-width: none;
  margin-top: 8px;
  font-size: var(--fs-xs);
  line-height: 1.7;
  color: var(--mist);
}
.legend-list {
  margin-top: 16px;
  border-top: var(--hair);
}
.legend-item + .legend-item { border-top: var(--hair); }
.legend-link {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 0 12px;
  align-items: baseline;
  padding: 11px 10px;
  border-left: 2px solid transparent;
  transition: background-color 0.16s linear, border-color 0.16s linear;
}
.legend-code {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--amber);
}
.legend-name {
  font-size: 15px;
  color: var(--paper);
}
.legend-desc {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.55;
  color: var(--mist);
}
.legend-link:hover {
  background: rgba(51, 225, 225, 0.08);
  border-left-color: var(--cyan);
}
.legend-link:hover .legend-name { color: var(--cyan); }

/* ---------- 10. 站点页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(60px, 9vw, 140px);
  background: var(--panel);
  border-top: var(--hair);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(120px, 18vw, 260px);
  height: 2px;
  background: var(--grad-pixel);
}

.footer-grid {
  max-width: 1440px;
  margin-inline: auto;
  padding: clamp(40px, 5.4vw, 76px) var(--gutter) clamp(28px, 3.4vw, 44px);
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(0, 2.6fr);
  gap: clamp(28px, 4.4vw, 72px);
}

.footer-identity {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}
.footer-brand {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 1.8vw, 1.75rem);
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--paper);
  transition: color 0.16s linear;
}
.footer-brand:hover { color: var(--cyan); }
.footer-signature {
  max-width: 20em;
  font-size: var(--fs-sm);
  color: var(--mist);
}
.footer-coords {
  display: flex;
  align-items: baseline;
  gap: 8px;
  width: 100%;
  max-width: none;
  padding-top: 12px;
  border-top: var(--hair);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.1em;
}
.coord-key { color: var(--mist); }
.coord-val { color: var(--amber); }

.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 40px);
}
.footer-col-title {
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: var(--hair);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--paper);
}
.footer-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-list a {
  position: relative;
  display: inline-block;
  padding: 3px 0;
  font-size: var(--fs-sm);
  color: var(--mist);
  transition: color 0.16s linear;
}
.footer-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.16s linear;
}
.footer-list a:hover { color: var(--paper); }
.footer-list a:hover::after { transform: scaleX(1); }
.footer-list a[aria-current="page"] { color: var(--cyan); }

.footer-note {
  max-width: 1440px;
  margin-inline: auto;
  padding: 22px var(--gutter);
  border-top: var(--hair);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.04em;
  line-height: 1.8;
  color: var(--mist);
  opacity: 0.86;
}

.footer-base {
  max-width: 1440px;
  margin-inline: auto;
  padding: 18px var(--gutter) 36px;
  border-top: var(--hair);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 32px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.05em;
  line-height: 1.8;
  color: var(--mist);
}
.footer-base p { max-width: none; }
.footer-contact { flex: 1 1 340px; }
.footer-meta {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  color: var(--paper);
}
.footer-icp { color: var(--amber); }
.footer-sep { color: var(--line); }

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1180px) {
  .topbar-signature { display: none; }
}

@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 900px) {
  body { padding-left: 0; }
  .skip-link { left: 10px; }

  .rail {
    width: min(296px, 84vw);
    align-items: stretch;
    gap: 14px;
    padding: 16px 14px 22px;
    transform: translateX(-102%);
    transition: transform 0.24s var(--ease);
    box-shadow: 24px 0 60px rgba(0, 0, 0, 0.55);
  }
  .rail::after { display: none; }
  .site-header[data-open="true"] .rail { transform: translateX(0); }

  .rail-head {
    flex-direction: row;
    align-self: flex-start;
    gap: 8px;
    width: auto;
    padding: 6px 12px;
  }
  .rail-nav-list { align-items: stretch; gap: 2px; }
  .rail-link {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 14px;
    width: 100%;
    padding: 12px 14px;
    border: var(--hair);
    border-left: 2px solid transparent;
  }
  .rail-index { font-size: 12px; }
  .rail-label {
    writing-mode: horizontal-tb;
    font-size: 15px;
    letter-spacing: 0.06em;
  }
  .rail-link[aria-current="page"] {
    background: rgba(51, 225, 225, 0.1);
    border-color: var(--line);
    border-left-color: var(--cyan);
    color: var(--paper);
  }
  .rail-link[aria-current="page"] .rail-index { color: var(--amber); }

  .topbar { left: 0; }
  .topbar-inner { padding-inline: clamp(14px, 4vw, 24px); }
  .topbar-actions { gap: 8px; }
  .legend-toggle { display: none; }
  .nav-toggle { display: inline-flex; }
  .btn { padding: 9px 14px; }

  .legend-panel {
    left: 0;
    width: min(360px, 100vw);
  }
}

@media (max-width: 760px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px 20px; }
  .footer-base { flex-direction: column; align-items: flex-start; gap: 14px; }
}

@media (max-width: 620px) {
  .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .topbar-brand-mark { min-width: 40px; font-size: 12px; }
  .nav-toggle-label { display: none; }
  .topbar-actions { gap: 6px; }
}

@media (max-width: 420px) {
  .btn-primary { padding: 9px 12px; letter-spacing: 0.04em; }
}

/* ---------- 12. 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;
  }
  html.js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
  .media-frame:hover > img { transform: none; }
}