/* =========================================================
   /assets/site.css — 半岛娱乐 · 数据舱 共享样式
   ========================================================= */

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

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

body, h1, h2, h3, h4, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
button, input { font: inherit; color: inherit; }
a { color: inherit; }

/* ---------- 2. 变量 ---------- */
:root {
  --c-deep:      #06131F;
  --c-panel:     #0C2033;
  --c-grid:      #16344C;
  --c-steel:     #2A4E68;
  --c-cyan:      #6FF2E0;
  --c-teal:      #0E7A73;
  --c-white:     #EDF4F7;
  --c-muted:     #9AB0C0;
  --c-coral:     #FF7A5C;
  --c-coral-dim: #8A3A2A;

  --rail-w: 260px;
  --shell-max: 1180px;
  --gap: clamp(16px, 2.4vw, 32px);
  --dur: 180ms;
  --ease: cubic-bezier(.2, .7, .3, 1);

  --f-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, "Times New Roman", serif;
  --f-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --line: 1px solid var(--c-grid);
}

/* ---------- 3. 基底与中文排版 ---------- */
body {
  min-height: 100vh;
  padding-left: 0;
  background-color: var(--c-deep);
  background-image:
    repeating-linear-gradient(to right, rgba(22, 52, 76, .55) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(to bottom, rgba(22, 52, 76, .32) 0 1px, transparent 1px 96px);
  background-attachment: fixed;
  color: var(--c-white);
  font-family: var(--f-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body[data-scroll-lock] { overflow: hidden; }

h1, h2, h3, h4 {
  font-family: var(--f-serif);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: .01em;
  color: var(--c-white);
}
h1 { font-size: clamp(34px, 5.2vw, 64px); }
h2 { font-size: clamp(26px, 3.2vw, 40px); }
h3 {
  font-family: var(--f-sans);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .06em;
  line-height: 1.6;
}
h4 { font-size: 17px; font-weight: 600; }

p { max-width: 68ch; }
strong, b { font-weight: 600; color: var(--c-white); }

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

/* ---------- 4. 焦点与可访问 ---------- */
:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
}
:focus:not(:focus-visible) { outline: none; }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.is-hidden { display: none !important; }

.skip-link {
  position: fixed; left: 12px; top: -80px; z-index: 120;
  padding: 10px 16px;
  background: var(--c-cyan); color: var(--c-deep);
  font-size: 13px; letter-spacing: .1em; text-decoration: none;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 5. 工具类 ---------- */
.mono {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}
.muted { color: var(--c-muted); }
.label {
  font-family: var(--f-sans);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-muted);
}
.rule { height: 1px; background: var(--c-grid); border: 0; margin-block: clamp(24px, 4vw, 48px); }

/* ---------- 6. 滚动进度 ---------- */
.scroll-meter {
  position: fixed; top: 0; left: 0; right: 0;
  height: 2px; z-index: 90;
  background: transparent;
  pointer-events: none;
}
.scroll-meter__bar {
  display: block; height: 100%; width: 100%;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 120ms linear;
}

/* ---------- 7. 侧边轨道头部 ---------- */
.rail-header {
  position: fixed; top: 0; left: 0; bottom: 0;
  width: var(--rail-w);
  z-index: 60;
  display: flex;
  flex-direction: column;
  background: var(--c-deep);
  border-right: var(--line);
  overflow-x: hidden;
  overflow-y: auto;
  scrollbar-width: thin;
}

.rail-meter {
  display: flex; flex-direction: column; gap: 6px;
  max-width: none;
  padding: 15px 20px 14px;
  border-bottom: var(--line);
  font-size: 11px; line-height: 1.5; letter-spacing: .14em;
  color: var(--c-muted);
}
.rail-meter__phase { color: var(--c-muted); }
.rail-meter__pulse {
  display: inline-flex; align-items: center; gap: 7px;
  color: var(--c-cyan); opacity: .9;
}
.pulse-dot {
  display: inline-block; width: 6px; height: 6px;
  background: var(--c-cyan);
  animation: pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: .25; }
  50%      { opacity: 1; }
}

.rail-brand { padding: 26px 20px 22px; border-bottom: var(--line); }
.brand { display: block; text-decoration: none; }
.brand__mark {
  display: block;
  font-family: var(--f-serif); font-weight: 700;
  font-size: 21px; line-height: 1.35; letter-spacing: .01em;
  color: var(--c-white);
  transition: color var(--dur) var(--ease);
}
.brand__sub {
  display: block; margin-top: 8px;
  font-size: 11px; line-height: 1.55; letter-spacing: .1em;
  color: var(--c-muted);
}
.brand:hover .brand__mark { color: var(--c-cyan); }

.rail-nav { flex: 1 1 auto; min-height: 0; padding: 12px 0 6px; }
.rail-nav__list { display: flex; flex-direction: column; }
.rail-nav__item { border-bottom: var(--line); }
.rail-nav__item:first-child { border-top: var(--line); }

.rail-nav__link {
  position: relative;
  display: grid; grid-template-columns: 10px 26px 1fr;
  align-items: center; gap: 10px;
  padding: 13px 20px;
  border-left: 2px solid transparent;
  color: var(--c-muted);
  font-size: 15px; letter-spacing: .04em;
  text-decoration: none;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.rail-nav__link:hover {
  color: var(--c-white);
  background: rgba(22, 52, 76, .55);
  border-left-color: var(--c-steel);
}
.rail-nav__cursor {
  width: 8px; height: 8px;
  border: 1px solid var(--c-steel);
  background: transparent;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.rail-nav__index {
  font-family: var(--f-mono);
  font-size: 11px; letter-spacing: .08em;
  color: var(--c-steel);
  transition: color var(--dur) var(--ease);
}
.rail-nav__link:hover .rail-nav__index { color: var(--c-muted); }
.rail-nav__link[aria-current="page"] {
  color: var(--c-cyan);
  border-left-color: var(--c-cyan);
  background: rgba(111, 242, 224, .06);
}
.rail-nav__link[aria-current="page"] .rail-nav__cursor {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}
.rail-nav__link[aria-current="page"] .rail-nav__index { color: var(--c-cyan); }
.rail-nav__label { font-weight: 500; }

.rail-nav__legal {
  display: flex; flex-wrap: wrap; gap: 6px 16px;
  padding: 18px 20px 4px;
}
.rail-nav__minor {
  font-size: 11px; letter-spacing: .1em;
  color: var(--c-steel);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.rail-nav__minor:hover { color: var(--c-cyan); }

.rail-tools {
  display: grid; gap: 8px;
  padding: 16px 20px 20px;
  border-top: var(--line);
  background: linear-gradient(180deg, rgba(12, 32, 51, 0) 0%, rgba(12, 32, 51, .6) 100%);
}
.tool-btn {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  width: 100%;
  padding: 10px 12px;
  background: transparent;
  border: 1px solid var(--c-grid);
  color: var(--c-muted);
  font-family: var(--f-sans);
  font-size: 12px; letter-spacing: .12em;
  text-decoration: none;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.tool-btn::after {
  content: "›";
  font-family: var(--f-mono);
  color: var(--c-steel);
  transition: color var(--dur) var(--ease);
}
.tool-btn:hover {
  color: var(--c-white);
  border-color: var(--c-steel);
  background: rgba(22, 52, 76, .5);
}
.tool-btn:hover::after { color: var(--c-cyan); }
.tool-btn[aria-expanded="true"] {
  color: var(--c-cyan);
  border-color: var(--c-cyan);
  background: rgba(111, 242, 224, .06);
}
.tool-btn--link::after { content: "→"; }

.rail-panel {
  display: none;
  padding: 14px 20px 18px;
  border-top: var(--line);
  background: var(--c-panel);
}
.rail-panel[data-open] { display: block; }
.rail-panel__head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 12px;
  max-width: none;
  margin-bottom: 10px;
}
.rail-panel__label { display: block; margin-bottom: 8px; }
.rail-panel__status {
  max-width: none;
  margin-top: 10px;
  font-size: 11px; line-height: 1.6; letter-spacing: .06em;
  color: var(--c-muted);
}

.chip-row { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  padding: 6px 10px;
  background: transparent;
  border: 1px solid var(--c-grid);
  color: var(--c-muted);
  font-family: var(--f-sans);
  font-size: 12px; letter-spacing: .08em;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.chip:hover { border-color: var(--c-steel); color: var(--c-white); }
.chip[aria-pressed="true"] {
  background: rgba(111, 242, 224, .12);
  border-color: var(--c-cyan);
  color: var(--c-cyan);
}

.link-btn {
  padding: 0;
  background: none;
  border: 0;
  border-bottom: 1px solid var(--c-steel);
  color: var(--c-muted);
  font-family: var(--f-sans);
  font-size: 11px; letter-spacing: .12em;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.link-btn:hover { color: var(--c-cyan); border-bottom-color: var(--c-cyan); }

.rail-input {
  width: 100%;
  padding: 10px 12px;
  background: var(--c-deep);
  border: 1px solid var(--c-grid);
  color: var(--c-white);
  font-family: var(--f-mono);
  font-size: 13px; letter-spacing: .04em;
  transition: border-color var(--dur) var(--ease);
}
.rail-input::placeholder { color: var(--c-steel); font-family: var(--f-sans); }
.rail-input:focus { border-color: var(--c-cyan); outline: none; }
.rail-input:focus-visible { outline: 2px solid var(--c-cyan); outline-offset: 1px; }

/* ---------- 8. 移动控制 ---------- */
.nav-scrim { display: none; }
.nav-toggle { display: none; }

.to-top {
  position: fixed; right: 16px; bottom: 76px; z-index: 86;
  padding: 10px 14px;
  background: var(--c-panel);
  border: 1px solid var(--c-grid);
  color: var(--c-muted);
  font-family: var(--f-sans);
  font-size: 12px; letter-spacing: .12em;
  cursor: pointer;
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.to-top[data-visible] {
  opacity: 1; visibility: visible; pointer-events: auto;
}
.to-top:hover { color: var(--c-cyan); border-color: var(--c-cyan); }

/* ---------- 9. 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 7vw, 96px);
  border-top: var(--line);
  background: linear-gradient(180deg, rgba(12, 32, 51, .6) 0%, rgba(6, 19, 31, 1) 78%);
}
.site-footer__inner {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(32px, 5vw, 56px) clamp(20px, 4vw, 56px) 22px;
}
.site-footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}
.site-footer__brand { align-self: start; }
.site-footer__mark {
  display: block;
  font-family: var(--f-serif); font-weight: 700;
  font-size: 20px; letter-spacing: .01em;
  color: var(--c-white);
}
.site-footer__line {
  max-width: 36ch;
  margin-top: 12px;
  font-size: 14px; line-height: 1.75;
  color: var(--c-muted);
}
.site-footer__meta {
  max-width: none;
  margin-top: 14px;
  font-size: 11px; letter-spacing: .12em;
  color: var(--c-steel);
}
.site-footer__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
}
.foot-col { min-width: 0; }
.foot-col__title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: var(--line);
  font-family: var(--f-sans);
  font-size: 11px; font-weight: 500;
  letter-spacing: .16em;
  color: var(--c-cyan);
}
.foot-col__list { display: flex; flex-direction: column; gap: 9px; }
.foot-col__link {
  font-size: 14px; line-height: 1.65;
  color: var(--c-muted);
  text-decoration: none;
  overflow-wrap: anywhere;
  transition: color var(--dur) var(--ease);
}
.foot-col__link:hover { color: var(--c-white); }
.foot-col__link--strong { color: var(--c-white); }

.copy-btn {
  display: inline-flex; align-items: center; gap: 10px;
  margin-top: 14px;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid var(--c-grid);
  color: var(--c-muted);
  font-family: var(--f-sans);
  font-size: 11px; letter-spacing: .12em;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.copy-btn:hover { color: var(--c-cyan); border-color: var(--c-cyan); background: rgba(111, 242, 224, .05); }
.copy-btn[data-state="done"] { color: var(--c-cyan); border-color: var(--c-cyan); }
.copy-btn__state { font-family: var(--f-mono); color: var(--c-steel); }
.copy-btn[data-state="done"] .copy-btn__state { color: var(--c-coral); }

.site-footer__legal {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 24px;
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 18px;
  border-top: var(--line);
  font-size: 12px; letter-spacing: .06em;
  color: var(--c-steel);
}
.legal__icp { max-width: none; font-family: var(--f-mono); color: var(--c-muted); }
.legal__note { flex: 1 1 320px; max-width: 62ch; line-height: 1.7; }
.legal__copy { max-width: none; font-family: var(--f-mono); }

/* ---------- 10. 通用容器与分区 ---------- */
.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 56px);
}

.section {
  padding-block: clamp(40px, 6vw, 80px);
  border-top: var(--line);
}
.section:first-of-type { border-top: 0; }
.section__head {
  display: grid; gap: 10px;
  max-width: 66ch;
  margin-bottom: clamp(20px, 3vw, 36px);
}
.section__index {
  font-family: var(--f-mono);
  font-size: 12px; letter-spacing: .16em;
  color: var(--c-cyan);
}
.section__title { font-size: clamp(26px, 3.4vw, 42px); }
.section__desc {
  max-width: 64ch;
  font-size: 16px;
  color: var(--c-muted);
}

/* ---------- 11. 栅格 ---------- */
.grid { display: grid; gap: var(--gap); grid-template-columns: 1fr; }
.grid--2, .grid--3 { grid-template-columns: 1fr; }

/* ---------- 12. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 20px;
  background: transparent;
  border: 1px solid var(--c-steel);
  color: var(--c-white);
  font-family: var(--f-sans);
  font-size: 13px; letter-spacing: .1em;
  text-decoration: none;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.btn:hover { border-color: var(--c-cyan); color: var(--c-cyan); background: rgba(111, 242, 224, .06); }
.btn--primary {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: var(--c-deep);
  font-weight: 500;
}
.btn--primary:hover { background: #8ff7ea; border-color: #8ff7ea; color: var(--c-deep); }
.btn--ghost { border-color: var(--c-grid); color: var(--c-muted); }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }

/* ---------- 13. 数据组件 ---------- */
.data-card {
  display: flex; flex-direction: column; gap: 12px;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--c-panel);
  border: 1px solid var(--c-grid);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.data-card:hover { border-color: var(--c-steel); transform: translateY(-2px); }
.data-card__label {
  font-size: 12px; letter-spacing: .12em;
  color: var(--c-muted);
}
.data-card__value {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 5vw, 48px);
  line-height: 1;
  letter-spacing: .01em;
  color: var(--c-white);
}
.data-card__value--accent { color: var(--c-coral); }
.data-card__foot {
  padding-top: 10px;
  border-top: var(--line);
  font-size: 12px; letter-spacing: .08em;
  color: var(--c-muted);
}
.data-card--offset { margin-top: 0; }

.stat-row {
  display: flex; flex-wrap: wrap;
  background: var(--c-panel);
  border: 1px solid var(--c-grid);
}
.stat {
  flex: 1 1 140px;
  padding: 16px 18px;
  border-right: var(--line);
}
.stat:last-child { border-right: 0; }
.stat__value {
  display: block;
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px; line-height: 1.2;
  color: var(--c-white);
}
.stat__label {
  display: block; margin-top: 6px;
  font-size: 11px; letter-spacing: .12em;
  color: var(--c-muted);
}

.tag {
  display: inline-block;
  padding: 4px 8px;
  border: 1px solid var(--c-grid);
  color: var(--c-muted);
  font-size: 11px; letter-spacing: .12em;
}
.tag--accent { color: var(--c-coral); border-color: var(--c-coral-dim); }

/* ---------- 14. 面包屑 ---------- */
.breadcrumb { padding-block: 18px; border-bottom: var(--line); }
.breadcrumb__list {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  font-size: 12px; letter-spacing: .1em;
  color: var(--c-muted);
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb__item[aria-current="page"] { color: var(--c-cyan); }
.breadcrumb__link {
  color: var(--c-muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.breadcrumb__link:hover { color: var(--c-cyan); }
.breadcrumb__sep { font-family: var(--f-mono); color: var(--c-steel); }

/* ---------- 15. 长文 ---------- */
.prose { max-width: 66ch; font-size: 17px; line-height: 1.8; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 {
  margin-top: 2.2em; padding-top: 1.2em;
  border-top: var(--line);
  font-size: clamp(24px, 2.8vw, 32px);
}
.prose h3 { margin-top: 1.8em; color: var(--c-cyan); }
.prose ul { display: flex; flex-direction: column; gap: .5em; padding-left: 1.1em; }
.prose li { position: relative; }
.prose li::before {
  content: "";
  position: absolute; left: -1.1em; top: .8em;
  width: 6px; height: 1px;
  background: var(--c-cyan);
}
.prose a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--c-teal);
  transition: border-color var(--dur) var(--ease);
}
.prose a:hover { border-bottom-color: var(--c-cyan); }
.prose__lede { max-width: 60ch; font-size: 19px; color: var(--c-muted); }

/* ---------- 16. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--c-panel);
  border: 1px solid var(--c-grid);
}
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame__img {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: saturate(.68) hue-rotate(180deg) brightness(.82) contrast(1.05);
}
.media-frame__grid {
  position: absolute; inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(to right, rgba(111, 242, 224, .12) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(to bottom, rgba(111, 242, 224, .08) 0 1px, transparent 1px 48px);
  mix-blend-mode: screen;
}
.media-frame__placeholder {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--f-mono);
  font-size: 12px; letter-spacing: .14em;
  color: var(--c-steel);
}
.media-frame__caption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 10px 14px;
  border-top: var(--line);
  background: rgba(6, 19, 31, .84);
  font-size: 11px; letter-spacing: .1em;
  color: var(--c-muted);
}

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1023px) {
  .rail-header {
    width: min(86vw, 330px);
    z-index: 80;
    padding-bottom: 28px;
    transform: translateX(-100%);
    transition: transform var(--dur) var(--ease);
    box-shadow: none;
  }
  .rail-header[data-open] { transform: translateX(0); }
  .rail-nav { flex: 0 0 auto; }

  .nav-scrim {
    display: block;
    position: fixed; inset: 0; z-index: 75;
    background: rgba(6, 19, 31, .74);
    opacity: 0; visibility: hidden;
    transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
  }
  .nav-scrim[data-open] { opacity: 1; visibility: visible; }

  .nav-toggle {
    display: inline-flex; align-items: center; gap: 10px;
    position: fixed; right: 16px; bottom: 16px; z-index: 85;
    padding: 13px 18px;
    background: var(--c-panel);
    border: 1px solid var(--c-cyan);
    color: var(--c-cyan);
    font-family: var(--f-sans);
    font-size: 12px; letter-spacing: .14em;
    cursor: pointer;
    transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
  }
  .nav-toggle::before {
    content: "";
    width: 14px; height: 9px;
    border-top: 1px solid currentColor;
    border-bottom: 1px solid currentColor;
  }
  .nav-toggle[aria-expanded="true"] { background: rgba(111, 242, 224, .12); }
}

@media (max-width: 599px) {
  .site-footer__legal { flex-direction: column; align-items: flex-start; }
}

@media (min-width: 600px) {
  .site-footer__cols { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 768px) {
  .site-footer__top { grid-template-columns: minmax(240px, 1fr) 1.45fr; }
}

@media (min-width: 900px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--offset > *:nth-child(even) { margin-top: 40px; }
  .data-card--offset { margin-top: 40px; }
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
  .nav-toggle { display: none; }
  .nav-scrim { display: none; }
  .scroll-meter { left: var(--rail-w); }
  .to-top { right: 32px; bottom: 32px; }
}

/* ---------- 18. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .data-card:hover { transform: none; }
}