/* ============================================================
   多宝体育登录 — 共享站点样式  /assets/site.css
   深墨绿底 / 瓷白与纸色 / 青柠焦点 / 琥珀编号
   ============================================================ */

/* ---------- 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, ul, ol, dl, dd, blockquote {
  margin: 0;
}

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

/* ---------- 2. Tokens ---------- */
:root {
  --ink: #0E2A24;
  --ink-deep: #071613;
  --porcelain: #F5F1E6;
  --paper: #E7DFC9;
  --lime: #C8F45A;
  --amber: #E9A64B;
  --sage: #86A096;
  --black: #111A17;
  --lime-soft: #E4FF9E;
  --amber-soft: #F5D3A0;

  --line: rgba(245, 241, 230, 0.16);
  --line-soft: rgba(245, 241, 230, 0.09);
  --line-ink: rgba(17, 26, 23, 0.85);

  --font-body: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-display: 'Barlow Condensed', 'Oswald', 'Noto Sans SC', 'PingFang SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', 'Noto Sans Mono CJK SC', 'Noto Sans SC', monospace;
  --font-hand: 'LXGW WenKai', 'Ma Shan Zheng', cursive;

  --rail-w: 272px;
  --gap: 8px;
  --pad-x: clamp(18px, 3.4vw, 56px);
  --stack-s: clamp(16px, 2vw, 24px);
  --stack-m: clamp(32px, 4vw, 48px);
  --stack-l: clamp(56px, 7vw, 96px);

  --ease: cubic-bezier(0.32, 0.72, 0.24, 1);
  --t-fast: 160ms;
  --t-mid: 240ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  padding-left: var(--rail-w);
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 620px at 92% -10%, rgba(200, 244, 90, 0.09), transparent 62%),
    radial-gradient(900px 700px at -12% 108%, rgba(233, 166, 75, 0.08), transparent 60%);
  background-attachment: fixed;
  color: var(--porcelain);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.015em;
  -webkit-font-smoothing: antialiased;
  transition: padding-left var(--t-mid) var(--ease);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 300;
  pointer-events: none;
  opacity: 0.5;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(245, 241, 230, 0.03) 0 1px,
    transparent 1px 3px
  );
}

main { min-width: 0; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 0.94;
  letter-spacing: 0.03em;
  color: var(--porcelain);
  text-wrap: balance;
}

h1 { font-size: clamp(44px, 7.2vw, 112px); }
h2 { font-size: clamp(30px, 3.8vw, 56px); }
h3 { font-size: clamp(21px, 2.2vw, 32px); line-height: 1.1; }
h4 { font-size: clamp(17px, 1.5vw, 21px); line-height: 1.24; letter-spacing: 0.05em; }

p { max-width: 66ch; }

strong { font-weight: 700; color: var(--porcelain); }
em { font-style: italic; }

::selection {
  background: var(--lime);
  color: var(--black);
}

/* ---------- 4. 焦点与可访问性 ---------- */
:where(a, button, [tabindex], input, select, textarea):focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 2px;
  box-shadow: 0 0 0 4px rgba(200, 244, 90, 0.22);
}

.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;
}

html.nav-open { overflow: hidden; }

/* ---------- 5. 布局容器 ---------- */
.container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 32px);
}

.grid--7-5 { grid-template-columns: 7fr 5fr; }
.grid--3-9 { grid-template-columns: 3fr 9fr; }
.grid--5-7 { grid-template-columns: 5fr 7fr; }
.grid--halves { grid-template-columns: 1fr 1fr; }

.grid > * { min-width: 0; }

/* ---------- 6. 组件：文字工具 ---------- */
.lead {
  font-size: clamp(17px, 1.5vw, 19px);
  line-height: 1.8;
  color: rgba(245, 241, 230, 0.86);
  max-width: 60ch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}

.annotation {
  font-family: var(--font-hand);
  font-style: italic;
  font-size: 14px;
  line-height: 1.6;
  color: var(--sage);
  letter-spacing: 0.02em;
}

/* ---------- 7. 组件：面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 20px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--sage);
}

.breadcrumb a {
  color: var(--sage);
  transition: color var(--t-fast) var(--ease);
}

.breadcrumb a:hover { color: var(--lime); }

.breadcrumb__sep {
  opacity: 0.5;
  user-select: none;
}

.breadcrumb [aria-current="page"] { color: var(--porcelain); }

/* ---------- 8. 组件：标签与卡片 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.07em;
  border: 1px solid currentColor;
  color: var(--amber);
  background: rgba(233, 166, 75, 0.1);
  white-space: nowrap;
}

.tag--lime {
  color: var(--lime);
  background: rgba(200, 244, 90, 0.12);
}

.tag--paper {
  color: var(--black);
  background: var(--amber-soft);
  border-color: var(--black);
}

.card {
  position: relative;
  padding: clamp(16px, 2vw, 26px);
  background: rgba(245, 241, 230, 0.045);
  border: 1px solid var(--line);
  transition: transform var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease);
}

.card::after {
  content: "";
  position: absolute;
  inset: 5px -5px -5px 5px;
  border: 1px solid var(--line-soft);
  pointer-events: none;
  transition: transform var(--t-mid) var(--ease);
  z-index: -1;
}

.card:hover {
  transform: translate(-2px, -2px);
  border-color: rgba(200, 244, 90, 0.42);
}

.card:hover::after { transform: translate(2px, 2px); }

.card--paper {
  background: var(--paper);
  color: var(--ink-deep);
  border: 1px solid var(--black);
  box-shadow: 5px 5px 0 rgba(17, 26, 23, 0.58);
}

.card--paper::after { display: none; }
.card--paper :where(h2, h3, h4, p, li) { color: var(--ink-deep); }

/* ---------- 9. 组件：按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 16px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.2;
  border: 1px solid currentColor;
  transition:
    transform var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    box-shadow var(--t-fast) var(--ease);
}

.btn--lime {
  background: var(--lime);
  color: var(--black);
  border-color: var(--lime);
  box-shadow: 3px 3px 0 var(--amber);
}

.btn--lime:hover {
  background: var(--lime-soft);
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--amber);
}

.btn--ghost {
  background: transparent;
  color: var(--porcelain);
  border-color: rgba(134, 160, 150, 0.65);
}

.btn--ghost:hover {
  color: var(--amber);
  border-color: var(--amber);
  background: rgba(233, 166, 75, 0.08);
}

.btn--block {
  display: flex;
  width: 100%;
  justify-content: space-between;
}

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

/* ---------- 10. 组件：图片框 ---------- */
.figure-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(7, 22, 19, 0.05), rgba(7, 22, 19, 0.18)),
    var(--paper);
  border: 1px solid var(--black);
  box-shadow: 6px 6px 0 rgba(233, 166, 75, 0.3);
}

.figure-frame > img,
.figure-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.05);
}

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

.figure-frame__caption {
  margin-top: 10px;
  font-family: var(--font-hand);
  font-style: italic;
  font-size: 13px;
  color: var(--sage);
}

/* ---------- 11. 组件：刻度条与荧光标记 ---------- */
.rule-scale {
  display: flex;
  align-items: center;
  height: 28px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(245, 241, 230, 0.28) 0 1px,
    transparent 1px 40px
  );
  background-size: 100% 8px;
  background-repeat: repeat-x;
  background-position: 0 100%;
}

[data-mark] {
  position: relative;
  display: inline-block;
  isolation: isolate;
}

[data-mark]::before {
  content: "";
  position: absolute;
  z-index: -1;
  left: -2px;
  right: -2px;
  bottom: 0.06em;
  height: 0.42em;
  background: linear-gradient(100deg, rgba(200, 244, 90, 0.66), rgba(228, 255, 158, 0.42));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 320ms var(--ease);
}

[data-mark].is-marked::before { transform: scaleX(1); }

/* ---------- 12. 头部：跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 400;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--black);
  background: var(--lime);
  border: 1px solid var(--black);
  transform: translateY(-200%);
  transition: transform var(--t-fast) var(--ease);
}

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

/* ---------- 13. 头部：阅读进度 ---------- */
.read-progress {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  height: 3px;
  z-index: 250;
  pointer-events: none;
  background: rgba(245, 241, 230, 0.08);
}

.read-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--lime), var(--amber));
}

/* ---------- 14. 头部：整体 ---------- */
.site-header {
  position: relative;
  z-index: 120;
}

/* ---------- 15. 头部：侧边轨道 ---------- */
.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3vh, 32px);
  width: var(--rail-w);
  padding: 26px 22px 22px;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--ink-deep);
  background-image:
    radial-gradient(340px 220px at 50% -6%, rgba(200, 244, 90, 0.1), transparent 70%);
  border-right: 1px solid var(--line);
  box-shadow: inset -1px 0 0 var(--line-soft);
}

.rail::-webkit-scrollbar { width: 6px; }
.rail::-webkit-scrollbar-thumb {
  background: rgba(245, 241, 230, 0.16);
  border-radius: 6px;
}

/* 品牌章 */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line-soft);
}

.brand__mark,
.mobile-bar__mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 500;
  color: var(--lime);
  background: rgba(200, 244, 90, 0.1);
  border: 1px solid rgba(200, 244, 90, 0.55);
  box-shadow: 2px 2px 0 rgba(233, 166, 75, 0.55);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: 0.06em;
  color: var(--porcelain);
}

.brand__desc {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.4;
  letter-spacing: 0.08em;
  color: var(--sage);
}

/* 侧边导航 */
.rail__nav { display: flex; flex-direction: column; gap: 10px; }

.rail__label {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--sage);
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-item { min-width: 0; }

.nav-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--porcelain);
  border-left: 2px solid transparent;
  transition:
    color var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
}

.nav-link__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--sage);
  font-variant-numeric: tabular-nums;
  transition: color var(--t-fast) var(--ease);
}

.nav-link__label { min-width: 0; }

.nav-link:hover {
  color: var(--lime-soft);
  background: rgba(245, 241, 230, 0.06);
  border-left-color: var(--amber);
  transform: translateX(2px);
}

.nav-link:hover .nav-link__idx { color: var(--amber); }

.nav-link[aria-current="page"] {
  color: var(--lime);
  background: rgba(200, 244, 90, 0.1);
  border-left-color: var(--lime);
}

.nav-link[aria-current="page"] .nav-link__idx { color: var(--lime); }

/* 侧边动作区 */
.rail__actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
}

/* 侧边元数据 */
.rail__meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
}

.rail__meta-line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--sage);
}

.rail__meta-num {
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.rail__note {
  margin-top: 6px;
  font-family: var(--font-hand);
  font-style: italic;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(134, 160, 150, 0.95);
}

/* ---------- 16. 头部：移动端 ---------- */
.mobile-bar,
.nav-scrim { display: none; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--lime);
  border: 1px solid rgba(200, 244, 90, 0.5);
  background: rgba(200, 244, 90, 0.06);
  transition: background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.nav-toggle:hover { background: rgba(200, 244, 90, 0.14); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: background-color var(--t-fast) var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--t-mid) var(--ease);
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

[data-header][data-open="true"] .nav-toggle__bars { background: transparent; }
[data-header][data-open="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
[data-header][data-open="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.nav-toggle__label { line-height: 1; }

/* ---------- 17. 页脚 ---------- */
.site-footer {
  margin-top: var(--stack-l);
  background: var(--ink-deep);
  background-image:
    radial-gradient(700px 320px at 8% 0%, rgba(233, 166, 75, 0.07), transparent 70%);
  color: var(--porcelain);
  border-top: 3px double rgba(245, 241, 230, 0.3);
}

.footer__top {
  display: grid;
  grid-template-columns: minmax(220px, 1.05fr) minmax(0, 1.9fr) minmax(230px, 1.15fr);
  gap: clamp(24px, 3.4vw, 56px);
  padding-block: clamp(40px, 5vw, 72px) clamp(28px, 3vw, 44px);
}

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

.brand--footer { padding-bottom: 14px; border-bottom: 1px solid var(--line-soft); }

.footer__tagline {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 241, 230, 0.72);
  max-width: 30ch;
}

.footer__stamp {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--amber);
  opacity: 0.9;
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 36px);
}

.footer__col { min-width: 0; }

.footer__col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
}

.footer__col-title::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--lime);
  transform: rotate(45deg);
}

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

.footer__link {
  display: inline-block;
  font-size: 14px;
  line-height: 1.5;
  color: rgba(245, 241, 230, 0.82);
  transition: color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.footer__link:hover {
  color: var(--amber);
  transform: translateX(2px);
}

.footer__contact { display: flex; flex-direction: column; gap: 12px; min-width: 0; }

.footer__contact-list { display: flex; flex-direction: column; gap: 8px; }

.footer__contact-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 13px;
  line-height: 1.6;
}

.footer__contact-key {
  flex: 0 0 34px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.footer__contact-value {
  color: rgba(245, 241, 230, 0.85);
  word-break: break-word;
  min-width: 0;
}

.footer__note {
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-hand);
  font-style: italic;
  font-size: 13px;
  line-height: 1.65;
  color: var(--sage);
  max-width: 34ch;
}

.footer__strip {
  background: rgba(200, 244, 90, 0.07);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.footer__strip-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(16px, 3vw, 48px);
  padding-block: 16px;
}

.footer__strip-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.footer__strip-key { color: var(--sage); }

.footer__strip-val {
  color: var(--porcelain);
  font-variant-numeric: tabular-nums;
}

.footer__bottom { border-top: 1px solid var(--line-soft); }

.footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--sage);
}

.footer__copy,
.footer__icp { font-size: 11px; }

.footer__icp { color: rgba(245, 241, 230, 0.6); }

/* 返回顶部 */
.to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 210;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--black);
  background: var(--paper);
  border: 1px solid var(--black);
  box-shadow: 3px 3px 0 rgba(233, 166, 75, 0.85);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition:
    opacity var(--t-mid) var(--ease),
    transform var(--t-mid) var(--ease),
    visibility var(--t-mid) var(--ease),
    background-color var(--t-fast) var(--ease);
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover { background: var(--lime); }

/* ---------- 18. 响应式：平板 ---------- */
@media (max-width: 1280px) and (min-width: 1081px) {
  :root { --rail-w: 248px; }
  .rail { padding: 22px 18px 18px; }
  .brand__desc { display: none; }
}

@media (max-width: 1080px) {
  :root { --rail-w: 0px; }

  body { padding-left: 0; font-size: 16px; }

  .read-progress { left: 0; }

  .mobile-bar {
    position: sticky;
    top: 0;
    z-index: 230;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 11px var(--pad-x);
    background: rgba(7, 22, 19, 0.95);
    border-bottom: 1px solid var(--line);
  }

  .mobile-bar__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
  }

  .mobile-bar__mark { width: 32px; height: 32px; font-size: 14px; }

  .mobile-bar__text {
    font-family: var(--font-display);
    font-size: 17px;
    font-weight: 800;
    letter-spacing: 0.06em;
    color: var(--porcelain);
    white-space: nowrap;
  }

  .nav-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 190;
    background: rgba(7, 22, 19, 0.68);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--t-mid) var(--ease), visibility var(--t-mid) var(--ease);
  }

  .site-header[data-open="true"] .nav-scrim {
    opacity: 1;
    visibility: visible;
  }

  .rail {
    top: 0;
    bottom: 0;
    z-index: 210;
    width: min(86vw, 320px);
    padding: 24px 20px 26px;
    gap: 22px;
    transform: translateX(-104%);
    transition: transform var(--t-mid) var(--ease);
    box-shadow: none;
  }

  .site-header[data-open="true"] .rail {
    transform: translateX(0);
    box-shadow: 12px 0 40px rgba(0, 0, 0, 0.45);
  }

  .brand__desc { display: block; }

  .nav-link { padding: 12px 10px; font-size: 16px; }

  .rail__actions { margin-top: 4px; }

  .grid--7-5,
  .grid--3-9,
  .grid--5-7,
  .grid--halves { grid-template-columns: 1fr; }

  .footer__top {
    grid-template-columns: 1fr 1fr;
    padding-block: 40px 32px;
  }

  .footer__brand { grid-column: 1 / -1; }

  .footer__contact { grid-column: 1 / -1; }

  .to-top { right: 14px; bottom: 14px; }
}

/* ---------- 19. 响应式：手机 ---------- */
@media (max-width: 720px) {
  h1 { font-size: clamp(36px, 12vw, 60px); }
  h2 { font-size: clamp(26px, 8vw, 38px); }

  .footer__top { grid-template-columns: 1fr; gap: 30px; }

  .footer__cols { grid-template-columns: 1fr 1fr; }

  .footer__strip-inner { gap: 12px 24px; padding-block: 14px; }

  .footer__strip-item { font-size: 11px; }

  .footer__bottom-inner { flex-direction: column; align-items: flex-start; gap: 8px; }

  .btn { padding: 12px 15px; font-size: 14px; }
}

@media (max-width: 420px) {
  .footer__cols { grid-template-columns: 1fr; }
}

/* ---------- 20. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  [data-mark]::before { transform: scaleX(1); }

  .to-top { transition: none; }
}