/* =========================================================
   华体汇移动 · 共享外壳样式 /assets/site.css
   深墨蓝基底 + 荧光青关键路径 + 暖橙次强调
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  margin: 0;
  background-color: #0A1A2A;
  background-image:
    repeating-linear-gradient(0deg, rgba(59, 240, 210, .035) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(90deg, rgba(59, 240, 210, .035) 0 1px, transparent 1px 72px);
  background-attachment: fixed;
  color: #EDF2F6;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.85;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
input, textarea, select { font: inherit; }
:focus-visible { outline: 2px solid #3BF0D2; outline-offset: 3px; }
::selection { background: #3BF0D2; color: #04211C; }

/* ---------- 2. tokens ---------- */
:root {
  --ink-900: #060D15;
  --ink-800: #0A1A2A;
  --ink-700: #122A40;
  --ink-600: #1E3B58;
  --mute: #93AABD;
  --mute-dim: rgba(147, 170, 189, .62);
  --white: #EDF2F6;
  --cyan: #3BF0D2;
  --orange: #FF8A3D;
  --mist: #CFF4EC;
  --grid: rgba(59, 240, 210, .10);
  --hair: rgba(147, 170, 189, .22);
  --hair-strong: rgba(147, 170, 189, .40);

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Noto Sans Mono CJK SC", monospace;

  --fs-label: 12px;
  --fs-sm: 14px;
  --fs-body: clamp(16px, .35vw + 15px, 18px);
  --fs-md: clamp(18px, .8vw + 15px, 24px);
  --fs-lg: clamp(22px, 1.6vw + 16px, 34px);
  --fs-xl: clamp(34px, 3.4vw + 18px, 56px);
  --fs-2xl: clamp(44px, 5.6vw + 20px, 96px);

  --bar-h: 48px;
  --rail-w: 264px;
  --wrap: 1280px;
  --gut: clamp(18px, 4vw, 56px);
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* ---------- 3. 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: var(--gut);
  padding-right: var(--gut);
}
.wrap--narrow { max-width: 820px; }

#main-content {
  display: block;
  min-height: 60vh;
  padding-top: var(--bar-h);
}
#main-content:focus { outline: none; }

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

/* ---------- 4. skip link ---------- */
.skip-link {
  position: fixed;
  top: 6px;
  left: 6px;
  z-index: 200;
  padding: 10px 16px;
  background: #3BF0D2;
  color: #04211C;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  border-radius: 2px;
  transform: translateY(-140%);
  transition: transform .18s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 5. header / 命令条 ---------- */
.site-header {
  --bar-h: 48px;
  position: relative;
  z-index: 60;
  transition: --bar-h .2s linear;
}
.site-header[data-condensed] { --bar-h: 40px; }

.cmdbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  height: var(--bar-h);
  background: rgba(6, 13, 21, .94);
  border-bottom: 1px solid var(--hair);
  backdrop-filter: blur(10px);
  transition: height .2s var(--ease);
}

.cmdbar__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  height: 100%;
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gut);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  min-height: 32px;
}
.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 26px;
  padding: 0 8px;
  border: 1px solid rgba(59, 240, 210, .45);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  border-radius: 2px;
}
.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand__name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--white);
}
.brand__host {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--mute-dim);
}

.cmdbar__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.cmd {
  display: inline-flex;
  align-items: center;
  height: 30px;
  padding: 0 12px;
  border: 1px solid var(--hair);
  border-radius: 2px;
  color: var(--mute);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  white-space: nowrap;
  transition: color .16s var(--ease), border-color .16s var(--ease), background-color .16s var(--ease);
}
.cmd:hover { color: var(--white); border-color: var(--hair-strong); background: rgba(147, 170, 189, .08); }
.cmd--cyan { color: var(--cyan); border-color: rgba(59, 240, 210, .55); background: rgba(59, 240, 210, .07); }
.cmd--cyan:hover { color: #04211C; background: var(--cyan); border-color: var(--cyan); }
.cmd--orange { color: var(--orange); border-color: rgba(255, 138, 61, .5); }
.cmd--orange:hover { color: #2A0F02; background: var(--orange); border-color: var(--orange); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-width: 44px;
  min-height: 44px;
  padding: 0 8px;
  border: 1px solid transparent;
  border-radius: 2px;
  color: var(--mute);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.nav-toggle:hover { color: var(--white); border-color: var(--hair); }
.nav-toggle__bars { position: relative; display: block; width: 18px; height: 11px; }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 1px;
  background: currentColor;
  transition: transform .16s var(--ease), top .16s var(--ease), bottom .16s var(--ease);
}
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] { color: var(--cyan); border-color: rgba(59, 240, 210, .38); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { bottom: 5px; transform: rotate(-45deg); }

/* ---------- 6. 滚动进度 ---------- */
.scroll-progress {
  position: fixed;
  top: var(--bar-h);
  left: 0;
  right: 0;
  z-index: 78;
  height: 2px;
  background: rgba(30, 59, 88, .55);
  pointer-events: none;
  transition: top .2s var(--ease);
}
.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

/* ---------- 7. 左侧索引栏 ---------- */
.index-rail {
  position: fixed;
  top: var(--bar-h);
  left: 0;
  z-index: 70;
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: var(--rail-w);
  height: calc(100vh - var(--bar-h));
  padding: clamp(22px, 4vh, 44px) clamp(16px, 1.8vw, 30px);
  overflow-y: auto;
  overscroll-behavior: contain;
  background: linear-gradient(180deg, #08131F 0%, #0A1A2A 100%);
  border-right: 1px solid var(--hair);
  transition: top .2s var(--ease), height .2s var(--ease);
}
.index-rail__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--mute-dim);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--hair);
}
.index-rail__list { display: flex; flex-direction: column; gap: 2px; }

.index-link {
  display: grid;
  grid-template-columns: 34px 1fr;
  align-items: baseline;
  gap: 6px;
  padding: 11px 8px;
  border-left: 1px solid transparent;
  border-radius: 0 2px 2px 0;
  color: var(--mute);
  transition: color .16s var(--ease), background-color .16s var(--ease), border-color .16s var(--ease);
}
.index-link__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: rgba(147, 170, 189, .55);
  transition: color .16s var(--ease), transform .16s var(--ease), font-size .16s var(--ease);
}
.index-link__label { font-size: 15px; letter-spacing: .02em; }
.index-link:hover { color: var(--white); background: rgba(59, 240, 210, .06); border-left-color: rgba(59, 240, 210, .45); }
.index-link:hover .index-link__num { color: var(--cyan); }
.index-link[aria-current="page"] {
  color: var(--cyan);
  background: rgba(59, 240, 210, .10);
  border-left-color: var(--cyan);
}
.index-link[aria-current="page"] .index-link__num { color: var(--cyan); transform: scale(1.08); }

.index-rail__foot {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--hair);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.index-rail__action {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid rgba(59, 240, 210, .38);
  border-radius: 2px;
  color: var(--cyan);
  font-size: 14px;
  transition: background-color .16s var(--ease), color .16s var(--ease);
}
.index-rail__action:hover { background: var(--cyan); color: #04211C; }
.index-rail__note { font-size: 13px; line-height: 1.7; color: var(--mute-dim); }

/* ---------- 8. footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 140px);
  background: #060D15;
  border-top: 1px solid var(--ink-600);
  color: var(--mute);
  padding: clamp(48px, 7vw, 88px) 0 28px;
}
.footer__inner {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: var(--gut);
  padding-right: var(--gut);
}
.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 72px);
}
.footer__brand { display: flex; flex-direction: column; align-items: flex-start; }
.footer__mark {
  display: inline-block;
  padding: 6px 10px;
  border: 1px solid rgba(59, 240, 210, .32);
  border-radius: 2px;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
}
.footer__name {
  margin: 16px 0 8px;
  font-family: var(--font-sans);
  font-size: clamp(22px, 2.2vw, 30px);
  font-weight: 300;
  letter-spacing: .02em;
  color: var(--white);
}
.footer__tagline { max-width: 34ch; font-size: 14px; line-height: 1.8; color: var(--mute); }
.footer__actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.footer__action {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  border: 1px solid var(--hair-strong);
  border-radius: 2px;
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  transition: color .16s var(--ease), border-color .16s var(--ease), background-color .16s var(--ease);
}
.footer__action:hover { border-color: var(--cyan); color: var(--cyan); background: rgba(59, 240, 210, .08); }
.footer__action--cyan { color: var(--cyan); border-color: rgba(59, 240, 210, .45); }
.footer__action--orange { color: var(--orange); border-color: rgba(255, 138, 61, .45); }
.footer__action--orange:hover { color: #2A0F02; background: var(--orange); border-color: var(--orange); }

.footer__cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 4vw, 48px);
}
.footer__col-title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--white);
}
.footer__list { display: flex; flex-direction: column; gap: 9px; }
.footer__link {
  display: inline-block;
  font-size: 14px;
  color: var(--mute);
  transition: color .16s var(--ease), transform .16s var(--ease);
}
.footer__link:hover { color: var(--cyan); transform: translateX(3px); }

.footer__contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px 32px;
  margin-top: clamp(36px, 5vw, 56px);
  padding-top: 26px;
  border-top: 1px solid var(--hair);
}
.footer__contact-row { display: flex; flex-direction: column; gap: 6px; }
.footer__contact-row--note { grid-column: 1 / -1; }
.footer__contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mute-dim);
}
.footer__contact-value { font-size: 15px; color: var(--white); }
.footer__note { font-size: 13px; line-height: 1.8; color: var(--mute-dim); max-width: 60ch; }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}
.footer__legal { display: flex; flex-wrap: wrap; gap: 18px; }
.footer__legal-link { color: var(--mute); }
.footer__legal-link:hover { color: var(--cyan); }
.footer__icp { color: var(--mute-dim); }
.footer__copy { color: var(--mute-dim); margin-left: auto; }
.to-top {
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--hair-strong);
  border-radius: 2px;
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  transition: color .16s var(--ease), border-color .16s var(--ease), background-color .16s var(--ease);
}
.to-top:hover { color: var(--cyan); border-color: rgba(59, 240, 210, .5); background: rgba(59, 240, 210, .08); }

/* ---------- 9. 通用排版组件 ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: .2em;
  color: var(--cyan);
}
.lede {
  font-size: clamp(17px, .6vw + 15px, 20px);
  line-height: 1.85;
  color: var(--mute);
  max-width: 38em;
}
.text-accent { color: var(--cyan); font-weight: 600; }
.text-warm { color: var(--orange); font-weight: 600; }

.section-head { margin-bottom: clamp(24px, 4vw, 48px); }
.section-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: .02em;
  color: rgba(59, 240, 210, .22);
}
.section-title {
  margin-top: .18em;
  font-size: clamp(36px, 5.6vw, 88px);
  font-weight: 250;
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--white);
}
.section-title em { font-style: normal; color: var(--cyan); }

.rule { height: 1px; border: 0; margin: clamp(32px, 5vw, 72px) 0; background: var(--hair); }
.rule--band {
  height: 4px;
  background: linear-gradient(90deg, var(--cyan), rgba(59, 240, 210, 0) 62%, var(--orange));
}

/* ---------- 10. 面板与按钮 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--ink-700);
  border: 1px solid var(--hair);
  border-radius: 2px;
}
.panel--layer {
  box-shadow: 7px 7px 0 0 rgba(18, 42, 64, .92), 8px 8px 0 0 rgba(147, 170, 189, .20);
}
.panel--mist {
  background: var(--mist);
  border-color: var(--mist);
  color: #0A1A2A;
}
.panel--mist p,
.panel--mist li,
.panel--mist .panel__title { color: #0A1A2A; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  transition: background-color .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}
.btn--cyan { background: var(--cyan); color: #04211C; }
.btn--cyan:hover { background: #6FF6DF; }
.btn--orange { background: var(--orange); color: #2A0F02; }
.btn--orange:hover { background: #FFA76A; }
.btn--ghost { border-color: var(--hair-strong); color: var(--white); }
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); background: rgba(59, 240, 210, .08); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: .08em;
  color: var(--mute);
}
.chip--cyan { color: var(--cyan); border-color: rgba(59, 240, 210, .42); }
.chip--orange { color: var(--orange); border-color: rgba(255, 138, 61, .42); }
.chip__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex: 0 0 auto;
}

/* ---------- 11. 控制台状态面板 ---------- */
.status {
  display: grid;
  border: 1px solid var(--hair);
  border-radius: 2px;
  background: var(--ink-700);
}
.status__row {
  display: grid;
  grid-template-columns: minmax(64px, auto) 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-top: 1px solid var(--hair);
  font-size: 15px;
}
.status__row:first-child { border-top: 0; }
.status__key {
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: .1em;
  color: var(--mute-dim);
}
.status__val { color: var(--white); }
.status__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(59, 240, 210, .14);
}
.status__dot--warm { background: var(--orange); box-shadow: 0 0 0 4px rgba(255, 138, 61, .16); }

/* ---------- 12. 索引列表 ---------- */
.index-list { border-top: 1px solid var(--hair); }
.index-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: clamp(14px, 2vw, 28px);
  padding: clamp(16px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--hair);
  transition: background-color .16s var(--ease);
}
.index-item:hover { background: rgba(59, 240, 210, .05); }
.index-item__num { font-family: var(--font-mono); font-size: var(--fs-label); color: var(--mute-dim); }
.index-item__title { font-size: clamp(17px, 1.2vw + 13px, 22px); font-weight: 400; color: var(--white); }
.index-item__meta { font-family: var(--font-mono); font-size: var(--fs-label); color: var(--mute-dim); }

/* ---------- 13. 面包屑 ---------- */
.breadcrumb { margin-bottom: clamp(20px, 3vw, 36px); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: .08em;
  color: var(--mute-dim);
}
.breadcrumb__list li + li::before { content: "/"; margin-right: 10px; color: rgba(147, 170, 189, .45); }
.breadcrumb__link { color: var(--mute); }
.breadcrumb__link:hover { color: var(--cyan); }
.breadcrumb__current { color: var(--cyan); }

/* ---------- 14. 网格 ---------- */
.grid { display: grid; gap: clamp(18px, 2.4vw, 32px); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.stack { display: flex; flex-direction: column; gap: clamp(16px, 2vw, 28px); }

/* ---------- 15. 图片容器基础规则 ---------- */
.media-figure { margin: 0; }
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--hair);
  border-radius: 2px;
  background: var(--ink-700);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 16 / 7; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--slant { clip-path: polygon(0 0, 100% 0, 100% 86%, 0 100%); }
.media-frame--placeholder {
  background-image:
    repeating-linear-gradient(0deg, transparent 0 47px, rgba(59, 240, 210, .09) 47px 48px),
    repeating-linear-gradient(90deg, transparent 0 47px, rgba(59, 240, 210, .09) 47px 48px);
}
.media-frame__label {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 12px;
  background: rgba(6, 13, 21, .84);
  border-top: 1px solid rgba(59, 240, 210, .35);
  border-right: 1px solid rgba(59, 240, 210, .35);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: .1em;
  color: var(--cyan);
}
.media-figure__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: .06em;
  color: var(--mute-dim);
}

/* ---------- 16. 滚动显现 ---------- */
[data-reveal] { opacity: 1; transform: none; }
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .48s var(--ease), transform .48s var(--ease);
}
.has-js [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 17. 响应式 ---------- */
@media (min-width: 900px) {
  .footer__top { grid-template-columns: minmax(260px, 1fr) minmax(0, 1.35fr); }
}

@media (min-width: 1024px) {
  #main-content { padding-left: var(--rail-w); }
  .footer__inner { padding-left: calc(var(--rail-w) + var(--gut)); }
}

@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }

  .index-rail {
    top: var(--bar-h);
    left: 0;
    right: 0;
    width: auto;
    height: auto;
    max-height: calc(100dvh - var(--bar-h));
    padding: 20px var(--gut) 26px;
    border-right: 0;
    border-bottom: 1px solid var(--hair);
    box-shadow: 0 18px 40px rgba(6, 13, 21, .6);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .18s var(--ease), transform .18s var(--ease), visibility .18s linear;
  }
  .index-rail[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .index-link { grid-template-columns: 40px 1fr; padding: 13px 10px; }
  .index-link__label { font-size: 16px; }
  .index-rail__foot { margin-top: 22px; }
}

@media (max-width: 899px) {
  .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .grid--12 > .col-4,
  .grid--12 > .col-5,
  .grid--12 > .col-7,
  .grid--12 > .col-8 { grid-column: 1 / -1; }
  .footer__cols { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 719px) {
  .cmd--secondary { display: none; }
  .brand__host { display: none; }
  .footer__copy { margin-left: 0; }
  .footer__bottom { gap: 12px 16px; }
  .status__row { grid-template-columns: 1fr auto; }
  .status__key { grid-column: 1 / -1; }
}

@media (min-width: 1024px) {
  .site-header[data-condensed] .cmd--secondary { display: none; }
}

/* ---------- 18. 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .has-js [data-reveal] { opacity: 1; transform: none; }
  .footer__link:hover { transform: none; }
  .index-link[aria-current="page"] .index-link__num { transform: none; }
}