/* ============================================================
   626 在线登录口 — /assets/site.css
   共享层：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   ============================================================ */

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

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

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

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

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩 */
  --bg: #05131F;
  --bg-deep: #020A12;
  --bg-channel: #0A2237;
  --bg-grid: #123049;
  --line: #1E4A66;
  --line-soft: rgba(30, 74, 102, 0.5);
  --ink: #E6EEF4;
  --ink-dim: #93AAB9;
  --orange: #FF7A29;
  --orange-soft: #FFB074;
  --cyan: #35E0D6;
  --green: #46D98A;
  --red: #FF5470;

  /* 字号阶梯：12 / 14 / 17 / 22 / 30 / 44 / 56 */
  --fs-1: 12px;
  --fs-2: 14px;
  --fs-3: 17px;
  --fs-4: 22px;
  --fs-5: 30px;
  --fs-6: 44px;
  --fs-7: 56px;

  /* 字体 */
  --font-display: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", Georgia, serif;

  /* 度量 */
  --shell-w: 1180px;
  --gutter: 24px;
  --shadow-hard: 6px 6px 0 0 var(--line);
  --shadow-soft: 4px 4px 0 0 var(--bg-deep);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
  letter-spacing: 0.005em;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-wrap: break-word;
}

main { flex: 1 0 auto; display: block; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.28;
}

h1 { font-size: var(--fs-7); }
h2 { font-size: var(--fs-5); }
h3 { font-size: var(--fs-4); }
h4 { font-size: var(--fs-3); }

strong, b { font-weight: 800; }
small { font-size: var(--fs-1); }

::selection { background: var(--orange); color: #06131F; }

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

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

/* ---------- 4. 布局 ---------- */
.shell {
  width: min(var(--shell-w), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}

.col-main { grid-column: 1 / span 7; }
.col-index { grid-column: 9 / span 3; }
.col-wide { grid-column: 1 / -1; }
.col-half { grid-column: span 6; }

.section { padding: clamp(56px, 8vw, 120px) 0; }
.section--tight { padding: clamp(32px, 4vw, 64px) 0; }
.section--deep { padding: clamp(72px, 11vw, 160px) 0; }

.section--channel {
  background-color: var(--bg-channel);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.section--ruled {
  border-top: 2px solid var(--line);
}

.divider {
  height: 2px;
  background-color: var(--line);
  border: 0;
  margin: 0;
}

/* ---------- 5. 文本工具 ---------- */
.mono {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.annot {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background-color: var(--orange);
  flex: none;
}

.lede {
  font-family: var(--font-serif);
  font-size: var(--fs-4);
  line-height: 1.7;
  color: var(--ink);
  max-width: 46ch;
}

.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;
}

.texture-lines { position: relative; }

.texture-lines::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(230, 238, 244, 0.06) 0 1px,
    transparent 1px 5px
  );
  opacity: 0.34;
}

.texture-lines > * { position: relative; z-index: 1; }

/* ---------- 6. 章节头 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 16px;
  margin-bottom: 32px;
  border-bottom: 2px solid var(--line);
}

.section-head__num {
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--orange);
  flex: none;
}

.section-head__title {
  font-size: var(--fs-5);
  flex: 1 1 auto;
  min-width: 0;
}

.section-head__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 20px;
  font-size: var(--fs-2);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  color: var(--ink);
  background-color: var(--bg-grid);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-soft);
  transition: transform 0.14s ease, box-shadow 0.14s ease,
              background-color 0.14s ease, color 0.14s ease,
              border-color 0.14s ease;
}

.btn:hover {
  transform: translate(-2px, -2px);
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: var(--shadow-hard);
}

.btn:active {
  transform: translate(0, 0);
  box-shadow: 2px 2px 0 0 var(--bg-deep);
}

.btn--primary {
  background-color: var(--orange);
  border-color: var(--orange);
  color: #06131F;
}

.btn--primary:hover {
  background-color: var(--orange-soft);
  border-color: var(--orange-soft);
  color: #06131F;
  box-shadow: 6px 6px 0 0 rgba(255, 122, 41, 0.35);
}

.btn--ghost { background-color: transparent; }
.btn--sm { padding: 8px 14px; font-size: var(--fs-1); }

/* ---------- 8. 标签 / 卡片 / 面板 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
  background-color: var(--bg-channel);
  border: 1px solid var(--line);
  transition: color 0.14s ease, border-color 0.14s ease,
              background-color 0.14s ease;
}

.chip:hover { color: var(--ink); border-color: var(--cyan); }

.chip[aria-pressed="true"] {
  background-color: var(--orange);
  border-color: var(--orange);
  color: #06131F;
  font-weight: 700;
}

.card {
  position: relative;
  padding: 22px 22px 20px;
  background-color: var(--bg-grid);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
  transition: border-color 0.16s ease;
}

.card:hover { border-color: var(--cyan); }

.card__num {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.card__title { font-size: var(--fs-4); margin-top: 8px; }

.card__text {
  margin-top: 10px;
  font-size: var(--fs-2);
  color: var(--ink-dim);
}

.card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}

.panel {
  padding: 24px;
  background-color: var(--bg-channel);
  border: 2px solid var(--line);
}

.panel--grid { background-color: var(--bg-grid); }

.callout {
  padding: 16px 20px;
  background-color: var(--bg-channel);
  border-left: 3px solid var(--orange);
}

.callout__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--orange);
}

/* ---------- 9. 索引列表 / 面包屑 ---------- */
.list-index { border-top: 2px solid var(--line); }

.list-index__item {
  display: flex;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.list-index__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.list-index__text { font-size: var(--fs-2); color: var(--ink); }

.list-index__item:hover .list-index__text { color: var(--cyan); }
.list-index__item:hover { border-bottom-color: var(--cyan); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}

.breadcrumb__item { display: flex; align-items: center; gap: 8px; }

.breadcrumb a {
  color: var(--ink-dim);
  border-bottom: 1px solid transparent;
}

.breadcrumb a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.breadcrumb__sep { color: var(--line); }

/* ---------- 10. 正文 / 图片容器 ---------- */
.prose { max-width: 62ch; }
.prose > * + * { margin-top: 1.05em; }
.prose h2 { font-size: var(--fs-5); margin-top: 1.8em; }
.prose h3 { font-size: var(--fs-4); margin-top: 1.5em; }
.prose p { color: var(--ink); }

.prose li { position: relative; padding-left: 20px; }

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 8px;
  height: 2px;
  background-color: var(--cyan);
}

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(53, 224, 214, 0.45);
}

.prose a:hover { border-bottom-color: var(--cyan); }

.prose blockquote {
  padding-left: 20px;
  border-left: 3px solid var(--line);
  font-family: var(--font-serif);
  font-size: var(--fs-4);
  color: var(--ink-dim);
}

.figure { margin: 0; }

.figure__frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--bg-grid);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.figure__frame > img,
.figure__frame > svg,
.figure__frame > picture { width: 100%; height: 100%; object-fit: cover; }

.figure__frame--tall { aspect-ratio: 3 / 4; }
.figure__frame--wide { aspect-ratio: 21 / 9; }
.figure__frame--square { aspect-ratio: 1 / 1; }

.figure__frame--placeholder {
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  background-image:
    repeating-linear-gradient(0deg, rgba(230, 238, 244, 0.05) 0 1px, transparent 1px 6px),
    repeating-linear-gradient(90deg, rgba(30, 74, 102, 0.35) 0 1px, transparent 1px 48px);
}

.figure__cap {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}

/* ---------- 11. 状态灯 ---------- */
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 999px;
  background-color: var(--dot, var(--green));
  box-shadow: 0 0 8px 0 var(--dot, var(--green));
}

.status-dot--orange { --dot: var(--orange); }
.status-dot--cyan { --dot: var(--cyan); }
.status-dot--green { --dot: var(--green); }
.status-dot--red { --dot: var(--red); }

.status-dot--pulse { animation: dot-pulse 0.6s ease-out 2; }

@keyframes dot-pulse {
  0% { box-shadow: 0 0 0 0 currentColor; opacity: 1; }
  100% { box-shadow: 0 0 0 9px rgba(70, 217, 138, 0); opacity: 1; }
}

/* ---------- 12. 页头 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 200;
  padding: 10px 16px;
  font-size: var(--fs-2);
  font-weight: 700;
  color: #06131F;
  background-color: var(--orange);
  border: 2px solid var(--orange-soft);
  transition: top 0.16s ease;
}

.skip-link:focus { top: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg);
  border-bottom: 2px solid var(--line);
}

/* 上层：品牌署名 + 版本日期条 + 状态灯 + 快捷入口 */
.header-utility {
  background-color: var(--bg-channel);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  max-height: 92px;
  opacity: 1;
  transition: max-height 0.28s ease, opacity 0.2s ease;
}

.header-utility__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  min-height: 52px;
  padding: 12px 0;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  flex: none;
  font-family: var(--font-display);
  font-size: var(--fs-4);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.brand__mark {
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--orange);
  border: 2px solid var(--orange);
  padding: 1px 6px 2px;
  transition: color 0.14s ease, border-color 0.14s ease;
}

.brand:hover .brand__mark { color: var(--orange-soft); border-color: var(--orange-soft); }
.brand:hover .brand__name { color: var(--cyan); }

.brand__name { color: var(--ink); transition: color 0.14s ease; }

.brand__tail {
  font-family: var(--font-body);
  font-size: var(--fs-1);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}

.ver-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
  background-color: var(--bg-grid);
  border: 1px solid var(--line);
}

.ver-badge__code { color: var(--cyan); }
.ver-badge__rev { color: var(--orange); font-weight: 700; }
.ver-badge__date { color: var(--ink-dim); }
.ver-badge__sep { color: var(--line); }

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}

.header-utility__links {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-left: auto;
  font-size: var(--fs-2);
  font-weight: 700;
}

.header-utility__links a {
  color: var(--ink-dim);
  border-bottom: 1px solid transparent;
  transition: color 0.14s ease, border-color 0.14s ease;
}

.header-utility__links a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* 下层：主导航 */
.header-navbar {
  position: relative;
  background-color: var(--bg);
}

.header-navbar__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 56px;
}

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

.site-nav__list { display: flex; align-items: stretch; gap: 2px; }

.site-nav__list a {
  display: block;
  padding: 10px 14px;
  font-size: var(--fs-2);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-dim);
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, background-color 0.15s ease,
              border-color 0.15s ease;
}

.site-nav__list a:hover {
  color: var(--ink);
  background-color: var(--bg-channel);
}

.site-nav__list a[aria-current="page"] {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  font-size: var(--fs-2);
  font-weight: 700;
  color: var(--ink);
  border: 2px solid var(--line);
  transition: color 0.14s ease, border-color 0.14s ease;
}

.nav-toggle:hover { color: var(--cyan); border-color: var(--cyan); }
.nav-toggle[aria-expanded="true"] { color: var(--orange); border-color: var(--orange); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 14px;
  height: 2px;
  background-color: currentColor;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 14px;
  height: 2px;
  background-color: currentColor;
}

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

.header-navbar__meta {
  display: none;
  align-items: center;
  gap: 14px;
  margin-left: auto;
}

.site-header[data-condensed] .header-utility {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.site-header[data-condensed] .header-navbar__meta { display: flex; }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background-color: var(--orange);
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(80px, 10vw, 160px);
  background-color: var(--bg-channel);
  border-top: 2px solid var(--line);
  overflow: hidden;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr 0.9fr 0.9fr 1.7fr;
  gap: 28px;
  padding: clamp(40px, 5vw, 64px) 0 clamp(28px, 4vw, 48px);
}

.footer-brand__name {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-size: var(--fs-4);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.footer-brand__line {
  margin-top: 12px;
  max-width: 30ch;
  font-size: var(--fs-2);
  color: var(--ink-dim);
}

.footer-brand__ver {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}

.footer-col__title {
  padding-bottom: 10px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
  border-bottom: 1px solid var(--line);
}

.footer-col__list li + li { margin-top: 8px; }

.footer-col__list a {
  font-size: var(--fs-2);
  color: var(--ink);
  border-bottom: 1px solid transparent;
  transition: color 0.14s ease, border-color 0.14s ease;
}

.footer-col__list a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }

.footer-contact__list { margin: 0; }

.footer-contact__row {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 6px 0;
  border-bottom: 1px solid var(--line-soft);
}

.footer-contact__row dt {
  flex: none;
  min-width: 42px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.footer-contact__row dd {
  font-size: var(--fs-2);
  color: var(--ink);
}

.footer-contact__note {
  margin-top: 12px;
  font-size: var(--fs-1);
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  color: var(--ink-dim);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 0 26px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}

.footer-legal__item { display: inline-flex; align-items: center; gap: 8px; }

/* ---------- 14. 显现动效 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.24s ease, transform 0.24s ease;
}

html.js [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 1000px) {
  .col-main,
  .col-index,
  .col-half { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  :root { --gutter: 20px; }

  .brand__tail { display: none; }
  .header-utility__links { gap: 14px; }
  .header-navbar__meta { display: none !important; }

  .nav-toggle { display: inline-flex; }
  .header-navbar__inner { justify-content: space-between; }
  .site-nav { margin-left: 0; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    background-color: var(--bg-channel);
    border-top: 2px solid var(--line);
    border-bottom: 2px solid var(--line);
    box-shadow: var(--shadow-hard);
    z-index: 120;
  }

  .site-nav[data-open] { display: block; }

  .site-nav__list { flex-direction: column; gap: 0; padding: 8px 0; }

  .site-nav__list a {
    padding: 14px 18px;
    border-bottom: 1px solid var(--line-soft);
    border-left: 3px solid transparent;
    border-bottom-width: 1px;
  }

  .site-nav__list a[aria-current="page"] {
    color: var(--orange);
    border-left-color: var(--orange);
    border-bottom-color: var(--line-soft);
    background-color: rgba(255, 122, 41, 0.07);
  }

  h1 { font-size: var(--fs-5); }
  h2 { font-size: var(--fs-4); }
}

@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  h1 { font-size: var(--fs-5); }
  .lede { font-size: var(--fs-3); }
  .header-utility__inner { gap: 10px; padding: 10px 0; }
  .header-status { width: 100%; }
  .header-utility__links { margin-left: 0; }
  .footer-legal { flex-direction: column; gap: 6px; }
}

/* ---------- 16. 降低动效 ---------- */
@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;
  }

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

  .status-dot--pulse { animation: none; }
}