/* =========================================================
   杏彩赛场 / SPRINT-XINGCAI  —  /assets/site.css
   共享外壳：reset、变量、中文排版、头部、页脚、通用组件
   ========================================================= */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

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

:where(a, button, input, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 0;
}

/* ---------- 变量 ---------- */
:root {
  --ink: #0B0C0E;
  --ink-2: #14161A;
  --ink-3: #1D2026;
  --apricot: #FF8A3D;
  --apricot-hot: #FF5A2A;
  --apricot-soft: #FFB37A;
  --cyan: #29E6D6;
  --lime: #E6FF4D;
  --paper: #F4EEE6;
  --muted: #8A909A;
  --teal-deep: #12302F;
  --brown-deep: #3A1D12;

  --line: rgba(244, 238, 230, 0.14);
  --line-strong: rgba(244, 238, 230, 0.30);

  --shell: 1280px;
  --shell-wide: 1440px;
  --measure: 44rem;
  --gutter: clamp(16px, 4vw, 48px);
  --header-h: 60px;

  --s1: 12px; --s2: 14px; --s3: 16px; --s4: 18px;
  --s5: 24px; --s6: 32px; --s7: 48px; --s8: 72px; --s9: 120px;

  --font-head: "Noto Sans SC", "HarmonyOS Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "HarmonyOS Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Consolas, "PingFang SC", monospace;

  --dur: .18s;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 中文排版基础 ---------- */
body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.78;
  font-weight: 400;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.16;
  text-wrap: balance;
}
h1 { font-size: clamp(34px, 5.4vw, 68px); }
h2 { font-size: clamp(26px, 3.6vw, 44px); }
h3 { font-size: clamp(20px, 2.2vw, 28px); }
h4 { font-size: var(--s4); letter-spacing: -0.02em; }

p { margin-bottom: 1.05em; }
p:last-child { margin-bottom: 0; }

strong { font-weight: 700; color: var(--paper); }
::selection { background: var(--lime); color: var(--ink); }

/* ---------- 布局原子 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.shell--wide { max-width: var(--shell-wide); }

.prose { max-width: var(--measure); }
.prose p { line-height: 1.85; }

.section { padding-block: clamp(40px, 6vw, 80px); }
.section + .section { border-top: 1px solid var(--line); }

.section-title { margin: 0 0 18px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 14px;
}
.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--apricot);
  flex: 0 0 auto;
}

.rule { height: 1px; background: var(--line); border: 0; margin: 0; }

.grid { display: grid; gap: clamp(16px, 2.4vw, 32px); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }

.stack > * + * { margin-top: var(--stack-gap, 16px); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--s2);
  letter-spacing: .02em;
  text-decoration: none;
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  transition: background var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}
.btn--primary { background: var(--apricot); color: var(--ink); border-color: var(--apricot); }
.btn--primary:hover { background: var(--apricot-hot); border-color: var(--apricot-hot); }
.btn--ghost { color: var(--paper); border-color: var(--line-strong); }
.btn--ghost:hover { color: var(--cyan); border-color: var(--cyan); }
.btn:active { transform: translateY(1px); }

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  background: var(--ink-3);
  color: var(--apricot-soft);
  border: 1px solid var(--line);
  white-space: nowrap;
}
.tag--lime { background: var(--lime); color: var(--ink); border-color: var(--lime); font-weight: 700; }
.tag--cyan { background: transparent; color: var(--cyan); border-color: rgba(41, 230, 214, .55); }

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  max-width: var(--shell);
  margin-inline: auto;
  padding: 20px var(--gutter) 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
}
.breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumbs li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs li::after { content: "/"; color: rgba(244, 238, 230, 0.28); }
.breadcrumbs li:last-child::after { content: ""; }
.breadcrumbs a { text-decoration: none; color: var(--muted); transition: color var(--dur) var(--ease); }
.breadcrumbs a:hover { color: var(--apricot); }
.breadcrumbs [aria-current="page"] { color: var(--paper); }

/* ---------- 图片容器 ---------- */
.media-figure { margin: 0; }

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background:
    linear-gradient(140deg, var(--ink-3) 0%, var(--teal-deep) 100%);
  border: 1px solid var(--line);
}
.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(244, 238, 230, 0.10) 1px, transparent 1px);
  background-size: 4px 4px;
  opacity: .45;
}
.media-frame--portrait { aspect-ratio: 1 / 1.2; }
.media-frame--wide { aspect-ratio: 21 / 9; }

.media-frame--film {
  background:
    radial-gradient(circle at 50% 38%, #6b3118 0%, var(--brown-deep) 62%, #190c07 100%);
  border-color: rgba(255, 179, 122, .28);
}
.media-frame--film::after {
  background-image:
    radial-gradient(rgba(255, 200, 150, .18) 1px, transparent 1px),
    radial-gradient(circle at 50% 50%, transparent 45%, rgba(0, 0, 0, .55) 100%);
  background-size: 3px 3px, 100% 100%;
  opacity: .85;
}

.media-caption {
  margin-top: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 档案资料卡 ---------- */
.file-card {
  position: relative;
  display: block;
  padding: 18px 20px 22px;
  background: var(--ink-3);
  border: 1px solid var(--line);
  color: var(--paper);
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: border-color var(--dur) var(--ease),
              background var(--dur) var(--ease);
}
.file-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--apricot);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}
.file-card:hover,
.file-card:focus-visible { border-color: var(--apricot); background: var(--ink-2); }
.file-card:hover::before,
.file-card:focus-visible::before { transform: scaleY(1); background: var(--cyan); }

.file-card-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--lime);
  margin-bottom: 10px;
}
.file-card-title {
  display: block;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: var(--s4);
  letter-spacing: -0.02em;
  line-height: 1.4;
  margin-bottom: 8px;
}
.file-card-meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- 筛选协议 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.filter-chip {
  appearance: none;
  padding: 8px 13px;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  cursor: pointer;
  transition: background var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.filter-chip:hover { border-color: var(--cyan); color: var(--cyan); }
.filter-chip[aria-pressed="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  font-weight: 700;
}
.filter-chip[aria-pressed="true"]:hover { color: var(--ink); border-color: var(--lime); }
.filter-status {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--cyan);
}
[data-filter-item][hidden] { display: none !important; }

/* ---------- 复制按钮 ---------- */
.copy-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 2px 8px;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .02em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.copy-chip::after {
  content: "复制";
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--muted);
}
.copy-chip:hover { border-color: var(--cyan); color: var(--cyan); }
.copy-chip[data-copied] { border-color: var(--lime); color: var(--lime); }
.copy-chip[data-copied]::after { content: "已复制"; color: var(--lime); }
.copy-chip-text { white-space: nowrap; }

/* ---------- 显现 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
.js [data-reveal].is-visible { opacity: 1; transform: none; }

/* =========================================================
   头部：命令栏
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(11, 12, 14, 0.96);
  border-bottom: 1px solid var(--line-strong);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.skip-link {
  position: absolute;
  left: 14px;
  top: -80px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition: top .16s var(--ease);
}
.skip-link:focus { top: 8px; }

.command-bar {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 28px);
  width: 100%;
  max-width: var(--shell-wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
  height: var(--header-h);
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--paper);
}
.brand-mark {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  background: var(--apricot);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
}
.brand-name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.04em;
  white-space: nowrap;
}
.brand-latin {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--muted);
  white-space: nowrap;
  padding-left: 10px;
  border-left: 1px solid var(--line-strong);
  line-height: 1.4;
}

.primary-nav {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  justify-content: center;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
}
.nav-item { flex: 0 0 auto; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  padding: 9px 9px 11px;
  font-family: var(--font-head);
  font-size: 14px;
  line-height: 1.2;
  color: var(--paper);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}
.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}
.nav-label { white-space: nowrap; }
.nav-link::after {
  content: "";
  position: absolute;
  left: 9px;
  right: 9px;
  bottom: 4px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav-link:hover,
.nav-link:focus-visible { color: var(--apricot-soft); }
.nav-link:hover .nav-index { color: var(--apricot); }
.nav-link:hover::after,
.nav-link:focus-visible::after {
  transform: scaleX(1);
  background: var(--apricot);
}
.nav-link[aria-current="page"] { color: var(--cyan); font-weight: 700; }
.nav-link[aria-current="page"] .nav-index { color: var(--cyan); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); background: var(--cyan); }

.header-utility {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}
.utility-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  text-decoration: none;
  background: var(--apricot);
  color: var(--ink);
  border: 1px solid var(--apricot);
  transition: background var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}
.utility-link:hover { background: var(--apricot-hot); border-color: var(--apricot-hot); }
.utility-link--version {
  background: transparent;
  color: var(--paper);
  border-color: var(--line-strong);
}
.utility-link--version:hover {
  background: transparent;
  color: var(--lime);
  border-color: var(--lime);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  height: 34px;
  padding: 0 12px;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--apricot); color: var(--apricot); }
.nav-toggle-label { line-height: 1; }
.nav-toggle-bars {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 2px;
  background: var(--apricot);
  transition: background var(--dur) var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--apricot);
  transition: transform var(--dur) var(--ease);
}
.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-5px) rotate(-45deg); }

.status-strip {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-block: 6px;
  padding-inline: max(var(--gutter), calc((100% - var(--shell-wide)) / 2 + var(--gutter)));
  background: var(--ink-2);
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--muted);
}
.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(41, 230, 214, .16);
  animation: pulse-dot 2.6s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: .35; }
}
.status-text { color: var(--apricot-soft); white-space: nowrap; }
.status-meta { margin-left: auto; white-space: nowrap; }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--apricot) 0%, var(--apricot-hot) 45%, var(--cyan) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
  z-index: 3;
}

/* =========================================================
   页脚：档案柜
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  background: var(--ink-2);
  border-top: 1px solid var(--line-strong);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  max-width: var(--shell-wide);
  margin-inline: auto;
  padding: clamp(36px, 5vw, 64px) var(--gutter) clamp(30px, 4vw, 48px);
}

.footer-brand-line {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.4;
  letter-spacing: -0.035em;
  margin-bottom: 12px;
  max-width: 20ch;
}
.footer-brand-latin {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .28em;
  color: var(--muted);
  margin-bottom: 20px;
}

.version-chip {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: stretch;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
}
.version-chip-label {
  padding: 8px 10px;
  background: var(--lime);
  color: var(--ink);
  font-weight: 700;
  letter-spacing: .04em;
}
.version-chip-value {
  padding: 8px 11px;
  color: var(--paper);
  letter-spacing: .06em;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 36px);
}
.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 14px;
}
.footer-list { display: grid; gap: 9px; }
.footer-link {
  display: inline-block;
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-link:hover { color: var(--apricot); border-bottom-color: var(--apricot); }

.footer-contact-line {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 13px;
  line-height: 1.7;
}
.footer-contact-key {
  flex: 0 0 auto;
  min-width: 36px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--muted);
}
.footer-contact-value { color: var(--paper); }

.footer-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  max-width: var(--shell-wide);
  margin-inline: auto;
  padding: 16px var(--gutter);
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--muted);
}
.footer-legal { margin: 0; }
.footer-copy { margin: 0; color: var(--muted); }
.footer-actions { display: flex; align-items: center; gap: 14px; }

.back-to-top {
  padding: 5px 10px;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity var(--dur) var(--ease),
              transform var(--dur) var(--ease),
              visibility var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.back-to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover { color: var(--cyan); border-color: var(--cyan); }

.mobile-dock { display: none; }

/* =========================================================
   响应式
   ========================================================= */
@media (max-width: 1080px) {
  .brand-latin { display: none; }
  .nav-link { padding-inline: 7px; font-size: 13px; }
  .nav-index { display: none; }
}

@media (max-width: 900px) {
  :root { --header-h: 56px; }
  html { scroll-padding-top: 96px; }

  .command-bar { gap: 10px; }
  .brand-name { font-size: 16px; }
  .header-utility { display: none; }
  .nav-toggle { display: inline-flex; margin-left: auto; }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    max-height: 72vh;
    overflow-y: auto;
    padding: 6px var(--gutter) 18px;
    background: var(--ink-2);
    border-bottom: 1px solid var(--line-strong);
    box-shadow: 0 24px 48px rgba(0, 0, 0, .55);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-6px);
    transition: opacity var(--dur) var(--ease),
                transform var(--dur) var(--ease),
                visibility var(--dur) var(--ease);
  }
  .primary-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-top: 6px;
  }
  .nav-item { border-bottom: 1px solid var(--line); }
  .nav-item:last-child { border-bottom: 0; }
  .nav-link {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding: 14px 4px;
    font-size: 17px;
    letter-spacing: -0.02em;
  }
  .nav-index { display: inline; font-size: 11px; color: var(--muted); }
  .nav-link::after { left: 4px; right: auto; width: 22px; bottom: 8px; }
  .nav-link[aria-current="page"] .nav-index { color: var(--cyan); }

  .status-strip { font-size: 10px; gap: 8px; }
  .status-meta { display: none; }

  .grid--12 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

  .footer-top {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-bar { padding-bottom: calc(16px + 62px + env(safe-area-inset-bottom)); }

  .mobile-dock {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 55;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    background: rgba(20, 22, 26, 0.97);
    border-top: 1px solid var(--line-strong);
    padding-bottom: env(safe-area-inset-bottom);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
  }
  .dock-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: 9px 4px;
    min-height: 52px;
    text-decoration: none;
    color: var(--paper);
    border-right: 1px solid var(--line);
    transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
  }
  .dock-item:last-child { border-right: 0; }
  .dock-item:hover,
  .dock-item:focus-visible { color: var(--cyan); background: rgba(41, 230, 214, .07); }
  .dock-key {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: .12em;
    color: var(--cyan);
    line-height: 1.2;
  }
  .dock-label { font-size: 12px; line-height: 1.2; white-space: nowrap; }
}

@media (max-width: 560px) {
  body { font-size: 16px; line-height: 1.75; }
  .brand-mark { width: 24px; height: 24px; font-size: 12px; }
  .brand-name { font-size: 15px; }
  .grid--12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
  .footer-bar { font-size: 10px; }
  .copy-chip { font-size: 11px; }
  .status-text { overflow: hidden; text-overflow: ellipsis; }
}

/* =========================================================
   动效偏好
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .status-dot { animation: none !important; opacity: 1 !important; }
}