/* =========================================================
   AK主站 · /assets/site.css
   赛场数据指挥中心 / 框架式导航 / 极细界线 / 大字报数据
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #0B1410;
  --panel: #101B16;
  --raise: #16241E;
  --text: #E8EDE9;
  --muted: #9AA8A1;
  --flame: #FF4B1F;
  --flame-2: #FF7A45;
  --blue: #2FA8FF;
  --blue-soft: #7FD1FF;
  --blue-panel: #0F2A3A;
  --line: #3A4A42;

  --rail-w: 264px;
  --status-h: 36px;
  --rail-bar-h: 62px;

  --font-head: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', sans-serif;
  --font-body: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Roboto Mono', 'SFMono-Regular', monospace;

  --ease: cubic-bezier(.2, .7, .3, 1);
  --r: 2px;
  --shadow: 0 14px 34px -26px rgba(0, 0, 0, .95);
}

/* ---------- 2. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  padding: 0;
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 14% -8%, rgba(47, 168, 255, .08), transparent 52%),
    radial-gradient(circle at 94% 2%, rgba(255, 75, 31, .07), transparent 46%),
    linear-gradient(180deg, #0B1410 0%, #0A120E 60%, #0B1410 100%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}
img, svg, video { max-width: 100%; }
ul, ol { margin: 0; padding: 0; list-style: none; }
p { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.02em;
}
h1 { font-size: clamp(34px, 5vw, 56px); line-height: 1.05; font-weight: 900; }
h2 { font-size: clamp(24px, 3vw, 32px); }
h3 { font-size: 20px; }
hr { border: 0; border-top: 1px solid var(--line); margin: 0; }
::selection { background: var(--flame); color: #0B1410; }

/* ---------- 3. 基础工具 ---------- */
.mono {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
}
.wrap {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: clamp(18px, 4vw, 40px);
}
.main-frame {
  padding-left: var(--rail-w);
  padding-top: var(--status-h);
  scroll-margin-top: calc(var(--status-h) + 8px);
  min-height: 60vh;
}
.main-frame:focus { outline: none; }
.section { padding-block: clamp(36px, 5vw, 76px); }
.section + .section { border-top: 1px solid var(--line); }
.section-title { font-size: clamp(24px, 3vw, 32px); }
.lede {
  font-size: 17px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 62ch;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--blue-soft);
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--flame);
}
.v-label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .32em;
  color: var(--muted);
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
  background: var(--panel);
}
.tag--flame { border-color: rgba(255, 75, 31, .55); color: var(--flame); }
.tag--blue { border-color: rgba(47, 168, 255, .55); color: var(--blue-soft); }
.rule { height: 1px; background: var(--line); border: 0; }
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
  box-shadow: var(--shadow);
}
.stack > * + * { margin-top: 16px; }

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--panel);
  color: var(--text);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: .04em;
  line-height: 1.3;
  cursor: pointer;
  transition: background .18s var(--ease), border-color .18s var(--ease),
              transform .18s var(--ease), color .18s var(--ease);
}
.btn:hover { background: var(--raise); border-color: var(--flame); transform: translateY(-2px); }
.btn--flame {
  background: var(--flame);
  border-color: var(--flame);
  color: #0B1410;
}
.btn--flame:hover { background: var(--flame-2); border-color: var(--flame-2); color: #0B1410; }
.btn--ghost { background: transparent; }
.btn--ghost:hover { background: var(--raise); }
.btn__arrow { font-family: var(--font-mono); font-size: 13px; }

/* ---------- 5. 网格 ---------- */
.grid { display: grid; gap: clamp(18px, 2.4vw, 28px); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }
@media (max-width: 899.98px) {
  .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .grid--12 > * { grid-column: auto; }
}

/* ---------- 6. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--muted);
}
.crumbs-link { color: var(--muted); transition: color .18s var(--ease); }
.crumbs-link:hover { color: var(--flame); }
.crumbs-sep { color: var(--line); }
.crumbs [aria-current="page"] { color: var(--text); }

/* ---------- 7. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r);
  aspect-ratio: 16 / 9;
  background-color: var(--panel);
  background-image:
    repeating-linear-gradient(90deg, rgba(58, 74, 66, .34) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, rgba(58, 74, 66, .26) 0 1px, transparent 1px 64px),
    radial-gradient(120% 90% at 10% 6%, rgba(47, 168, 255, .18), transparent 58%),
    radial-gradient(90% 70% at 92% 94%, rgba(255, 75, 31, .16), transparent 62%);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(232, 237, 233, .05);
}
.media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--muted);
}

/* ---------- 8. 头部：跳过链接与进度 ---------- */
.skip-link {
  position: fixed;
  left: 12px;
  top: -64px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--flame);
  color: #0B1410;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 14px;
  border-radius: var(--r);
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 8px; }
.scroll-meter {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 200;
  background: linear-gradient(90deg, var(--flame), var(--flame-2));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* ---------- 9. 头部：状态细条 ---------- */
.status-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--status-h);
  z-index: 70;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 14px;
  background: #070E0A;
  border-bottom: 1px solid var(--line);
}
.status-ticker {
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.status-ticker::-webkit-scrollbar { display: none; }
.status-track { display: flex; width: max-content; }
.status-seq { display: flex; align-items: center; gap: 0; }
.status-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
  white-space: nowrap;
}
.status-item::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: none;
  background: var(--flame);
  box-shadow: 0 0 0 3px rgba(255, 75, 31, .16);
}
.status-item + .status-item {
  margin-left: 22px;
  padding-left: 22px;
  border-left: 1px solid var(--line);
}
.status-item b {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--text);
}
.status-item--blue::before {
  background: var(--blue);
  box-shadow: 0 0 0 3px rgba(47, 168, 255, .16);
}
.status-item--blue b { color: var(--blue-soft); }
.status-item--live::before { animation: statusPulse 2.4s ease-in-out infinite; }
@keyframes statusPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .35; transform: scale(.7); }
}
.status-meta {
  flex: none;
  margin: 0;
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--line);
  text-transform: uppercase;
}

/* ---------- 10. 头部：左侧框架导航 ---------- */
.rail {
  position: fixed;
  top: var(--status-h);
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 26px;
  padding: 26px 22px 22px;
  overflow-y: auto;
  background-color: #0A130F;
  background-image:
    linear-gradient(180deg, rgba(255, 75, 31, .05), transparent 22%),
    repeating-linear-gradient(0deg, rgba(58, 74, 66, .22) 0 1px, transparent 1px 44px);
  border-right: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  transition: opacity .18s var(--ease);
}
.brand:hover { opacity: .86; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  flex: none;
  background: var(--flame);
  color: #0B1410;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: .02em;
  border-radius: var(--r);
  box-shadow: 0 10px 24px -14px rgba(255, 75, 31, .95);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.3; min-width: 0; }
.brand-name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -.01em;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--muted);
  text-transform: uppercase;
}
.rail-nav { position: relative; padding-right: 16px; }
.nav-list { display: flex; flex-direction: column; gap: 2px; }
.nav-item { display: block; }
.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 12px 11px 14px;
  border: 1px solid transparent;
  border-radius: var(--r);
  color: var(--muted);
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .01em;
  transition: color .18s var(--ease), background .18s var(--ease),
              border-color .18s var(--ease), transform .18s var(--ease);
}
.nav-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  bottom: 7px;
  width: 2px;
  background: var(--flame);
  transform: scaleY(0);
  transform-origin: 50% 0;
  transition: transform .2s var(--ease);
}
.nav-link:hover {
  color: var(--text);
  background: var(--raise);
  border-color: var(--line);
  transform: translateX(2px);
}
.nav-link:hover::before { transform: scaleY(1); }
.nav-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--line);
  transition: color .18s var(--ease);
}
.nav-link:hover .nav-num { color: var(--flame-2); }
.nav-link[aria-current="page"] {
  color: var(--text);
  background: var(--raise);
  border-color: rgba(255, 75, 31, .5);
  font-weight: 800;
}
.nav-link[aria-current="page"]::before { transform: scaleY(1); }
.nav-link[aria-current="page"] .nav-num { color: var(--flame); }
.rail-foot {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.rail-note {
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.7;
  letter-spacing: .16em;
  color: var(--muted);
}
.rail-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: transparent;
  color: var(--text);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: .06em;
  transition: background .18s var(--ease), border-color .18s var(--ease);
}
.rail-cta::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--flame);
  transition: transform .18s var(--ease);
}
.rail-cta:hover { background: var(--raise); border-color: var(--flame); }
.rail-cta:hover::after { transform: translateX(4px); }
.rail-tag {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .34em;
  color: rgba(154, 168, 161, .45);
  pointer-events: none;
  user-select: none;
}

/* ---------- 11. 头部：移动端按钮与抽屉 ---------- */
.nav-toggle {
  position: fixed;
  top: calc(var(--status-h) + 12px);
  right: 14px;
  z-index: 120;
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r);
  color: var(--text);
  cursor: pointer;
  transition: border-color .18s var(--ease), background .18s var(--ease);
}
.nav-toggle:hover { border-color: var(--flame); background: var(--raise); }
.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
  height: 14px;
}
.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  transition: transform .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child { transform: translateY(-3px) rotate(-45deg); }
.nav-toggle-text {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
}
.nav-drawer {
  position: fixed;
  inset: 0;
  z-index: 110;
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding: calc(var(--status-h) + 76px) 22px 26px;
  background-color: #070E0A;
  background-image:
    radial-gradient(circle at 88% 4%, rgba(255, 75, 31, .12), transparent 42%),
    repeating-linear-gradient(0deg, rgba(58, 74, 66, .2) 0 1px, transparent 1px 52px);
  border-left: 1px solid var(--line);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-14px);
  transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s var(--ease);
}
.nav-drawer[data-open] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
body.is-nav-open { overflow: hidden; }
.drawer-head { border-bottom: 1px solid var(--line); padding-bottom: 14px; }
.drawer-eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .26em;
  color: var(--blue-soft);
}
.drawer-title {
  margin-top: 6px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 26px;
  letter-spacing: -.02em;
}
.drawer-nav { flex: 1 1 auto; overflow-y: auto; }
.drawer-item { display: block; }
.drawer-link {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 4px;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -.01em;
  transition: color .18s var(--ease), padding-left .18s var(--ease);
}
.drawer-link:hover,
.drawer-link[aria-current="page"] { color: var(--flame); padding-left: 10px; }
.drawer-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--blue-soft);
}
.drawer-link[aria-current="page"] .drawer-num { color: var(--flame); }
.drawer-foot {
  flex: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.drawer-note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
}
.drawer-cta { width: 100%; }

/* ---------- 12. 头部：右下信号按钮 ---------- */
.signal-top {
  position: fixed;
  right: 20px;
  bottom: 22px;
  z-index: 90;
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  padding: 0;
  border: 1px solid var(--flame-2);
  border-radius: 50%;
  background: var(--flame);
  color: #0B1410;
  cursor: pointer;
  box-shadow: 0 18px 34px -20px rgba(255, 75, 31, .95);
  transition: transform .18s var(--ease), background .18s var(--ease);
}
.signal-top:hover { background: var(--flame-2); transform: translateY(-2px); }
.signal-ring {
  position: absolute;
  inset: -6px;
  border: 1px solid rgba(255, 75, 31, .45);
  border-radius: 50%;
  pointer-events: none;
  animation: signalPulse 2.8s ease-out infinite;
}
@keyframes signalPulse {
  0% { transform: scale(.82); opacity: .85; }
  70% { transform: scale(1.14); opacity: 0; }
  100% { transform: scale(1.14); opacity: 0; }
}
.signal-icon {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  margin-left: var(--rail-w);
  border-top: 1px solid var(--line);
  background-color: #070D0A;
  background-image:
    radial-gradient(circle at 82% 0%, rgba(47, 168, 255, .08), transparent 46%),
    linear-gradient(180deg, #0A130F 0%, #070D0A 100%);
  color: var(--text);
}
.version-band {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: #060B08;
}
.version-track {
  display: flex;
  width: max-content;
  animation: versionScroll 46s linear infinite;
}
@keyframes versionScroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.version-seq {
  display: flex;
  gap: 26px;
  padding: 10px 26px;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--line);
}
.version-seq span:nth-child(2n) { color: rgba(47, 168, 255, .7); }
.footer-inner { padding-block: clamp(38px, 5vw, 60px) 24px; }
.footer-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 34px;
}
.brand--footer .brand-mark {
  width: 54px;
  height: 54px;
  font-size: 19px;
}
.brand--footer .brand-name { font-size: 20px; }
.brand--footer .brand-sub { font-size: 10px; letter-spacing: .24em; }
.footer-note {
  max-width: 44ch;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}
.footer-note--small {
  margin-top: 14px;
  font-size: 12px;
  line-height: 1.7;
  color: rgba(154, 168, 161, .82);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.5fr;
  gap: clamp(22px, 3vw, 40px);
}
.footer-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--blue-soft);
}
.footer-list { display: flex; flex-direction: column; gap: 9px; }
.footer-link {
  position: relative;
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14px;
  color: var(--text);
  transition: color .18s var(--ease);
}
.footer-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--flame);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .18s var(--ease);
}
.footer-link:hover { color: var(--flame); }
.footer-link:hover::after { transform: scaleX(1); }
.footer-list--contact { gap: 14px; }
.footer-list--contact li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}
.footer-key {
  flex: none;
  min-width: 44px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--line);
}
.footer-val { font-size: 14px; color: var(--text); }
.footer-val.mono { letter-spacing: .1em; }
.copy-mail {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 5px 10px;
  border: 1px dashed var(--line);
  border-radius: var(--r);
  background: var(--panel);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  cursor: pointer;
  transition: border-color .18s var(--ease), background .18s var(--ease), color .18s var(--ease);
}
.copy-mail:hover { border-color: var(--flame); background: var(--raise); }
.copy-hint {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--blue-soft);
}
.copy-mail.is-copied { border-color: var(--flame); }
.copy-mail.is-copied .copy-hint { color: var(--flame); }
.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: clamp(30px, 4vw, 46px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
}
.footer-copy { margin: 0; }
.footer-icp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
}
.footer-top {
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: transparent;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  cursor: pointer;
  transition: border-color .18s var(--ease), color .18s var(--ease), background .18s var(--ease);
}
.footer-top:hover { border-color: var(--flame); color: var(--flame); background: var(--raise); }

/* ---------- 14. 焦点可见 ---------- */
:focus-visible {
  outline: 2px solid var(--blue-soft);
  outline-offset: 3px;
  border-radius: 1px;
}
a:focus-visible,
button:focus-visible { outline: 2px solid var(--blue-soft); outline-offset: 3px; }

/* ---------- 15. 断点 ---------- */
@media (max-width: 1199.98px) {
  :root { --rail-w: 240px; }
  .rail { padding: 22px 18px 18px; }
}

@media (max-width: 1023.98px) {
  :root { --rail-w: 0px; }
  .main-frame { padding-left: 0; padding-top: calc(var(--status-h) + var(--rail-bar-h)); }
  .site-footer { margin-left: 0; }

  .rail {
    top: var(--status-h);
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: var(--rail-bar-h);
    flex-direction: row;
    align-items: center;
    gap: 14px;
    padding: 0 118px 0 16px;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .rail-nav, .rail-foot, .rail-tag { display: none; }
  .brand-mark { width: 38px; height: 38px; font-size: 15px; }
  .brand-name { font-size: 16px; }
  .brand-sub { font-size: 9px; letter-spacing: .18em; }

  .nav-toggle { display: inline-flex; }
  .status-meta { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-col--wide { grid-column: 1 / -1; }
}

@media (max-width: 599.98px) {
  :root { --rail-bar-h: 58px; }
  .status-item { font-size: 11px; }
  .status-item + .status-item { margin-left: 14px; padding-left: 14px; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .footer-col--wide { grid-column: auto; }
  .footer-head { flex-direction: column; align-items: flex-start; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .signal-top { width: 44px; height: 44px; right: 14px; bottom: 14px; }
  .drawer-link { font-size: 20px; padding: 12px 4px; }
  .nav-drawer { padding-left: 18px; padding-right: 18px; }
}

@media (min-width: 1024px) {
  .nav-drawer { display: none; }
}

/* ---------- 16. 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .version-track { animation: none; }
  .signal-ring { display: none; }
}