/* =========================================================
   博业体育赛场 · 共享站点套件 /assets/site.css
   赛场信号台：命令栏 + 刻度带 + 奶油纸面页脚
   ========================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
button { font: inherit; color: inherit; background: none; border: 0; }
table { border-collapse: collapse; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #061A2B;
  --ink-800: #0B2A43;
  --cream: #F4EBDD;
  --warm-white: #FFF8EC;
  --grayblue: #C9D3D8;
  --brown: #1B1512;
  --cyan: #19E3FF;
  --orange: #FF6A2A;
  --sig-red: #E8432E;
  --teal: #1E6F7A;
  --sand: #D8B36A;
  --focus: #7CB8FF;

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", Georgia, "Songti SC", serif;

  --step-1: 12px;
  --step-2: 16px;
  --step-3: 20px;
  --step-4: 28px;
  --step-5: 44px;
  --step-6: 72px;
  --step-7: 112px;

  --wrap: 1200px;
  --pad-x: clamp(18px, 4vw, 56px);
  --ease: cubic-bezier(.2, .7, .3, 1);
  --t-fast: 180ms;
  --t-mid: 240ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background: var(--ink-900);
  color: var(--warm-white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
@media (min-width: 900px) { body { font-size: 17px; } }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
}
p { text-wrap: pretty; }

::selection { background: var(--cyan); color: var(--ink-900); }

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

/* ---------- 4. 布局与通用组件 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.section { position: relative; padding-block: clamp(48px, 7vw, 96px); }
.section--ink { background: var(--ink-900); color: var(--warm-white); }
.section--mid { background: var(--ink-800); color: var(--warm-white); }
.section--paper { background: var(--cream); color: var(--brown); }
.section--paper h1, .section--paper h2, .section--paper h3 { color: var(--brown); }
.section--paper .lede { color: #4A4038; }
.section--paper .eyebrow { color: var(--sig-red); }
.section--paper .prose a { color: #0D6B7A; }
.section--paper .tag--cyan { color: var(--teal); }

.display {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 7vw, 112px);
  line-height: .94;
  letter-spacing: -.03em;
}

.lede {
  max-width: 46ch;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.75;
  color: var(--grayblue);
}

.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);
}
.eyebrow::before { content: ""; width: 18px; height: 1px; background: currentColor; }
.eyebrow--orange { color: var(--orange); }
.eyebrow--red { color: var(--sig-red); }
.eyebrow--sand { color: var(--sand); }

.index-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1;
  letter-spacing: -.02em;
  color: rgba(201, 211, 216, .3);
  -webkit-text-stroke: 1px rgba(201, 211, 216, .55);
}
.section--paper .index-num {
  color: rgba(27, 21, 18, .18);
  -webkit-text-stroke: 1px rgba(27, 21, 18, .42);
}

.data-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.prose { max-width: 68ch; font-size: 17px; line-height: 1.85; }
.prose p + p { margin-top: 1.1em; }
.prose h2 { font-size: clamp(24px, 3vw, 32px); margin: 1.7em 0 .6em; }
.prose h3 { font-size: clamp(19px, 2.2vw, 24px); margin: 1.4em 0 .5em; }
.prose ul, .prose ol { display: grid; gap: .5em; margin-block: 1em; }
.prose li { position: relative; padding-left: 1.4em; }
.prose li::before {
  content: ""; position: absolute; left: 0; top: .72em;
  width: 8px; height: 1px; background: var(--cyan);
}
.section--paper .prose li::before { background: var(--sig-red); }
.prose a { color: var(--cyan); text-decoration: underline; text-underline-offset: 3px; }
.prose blockquote {
  margin-block: 1.4em;
  padding-left: 1.1em;
  border-left: 3px solid var(--sand);
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--grayblue);
}

.rule-track {
  height: 10px;
  margin-block: clamp(20px, 3vw, 32px);
  border-top: 1px solid rgba(201, 211, 216, .18);
  background-image: repeating-linear-gradient(90deg, rgba(201, 211, 216, .35) 0 1px, transparent 1px 22px);
}
.section--paper .rule-track {
  border-top-color: rgba(27, 21, 18, .22);
  background-image: repeating-linear-gradient(90deg, rgba(27, 21, 18, .3) 0 1px, transparent 1px 22px);
}

/* 图片容器：页面阶段直接放入 img */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: linear-gradient(150deg, var(--ink-800), var(--ink-900));
  border: 1px solid rgba(201, 211, 216, .18);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--grayblue);
}
.section--paper .media-cap { color: #6B5F56; }

.panel {
  background: var(--ink-800);
  border: 1px solid rgba(201, 211, 216, .16);
  padding: clamp(18px, 3vw, 28px);
}
.panel--cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}
.panel--rail { border-left: 3px solid var(--cyan); }
.panel--rail-orange { border-left: 3px solid var(--orange); }
.panel--rail-red { border-left: 3px solid var(--sig-red); }
.panel--cream { background: var(--cream); color: var(--brown); border-color: rgba(27, 21, 18, .18); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  border: 1px solid currentColor;
  line-height: 1.5;
}
.tag--cyan { color: var(--cyan); }
.tag--orange { color: var(--orange); }
.tag--red { color: var(--sig-red); }
.tag--sand { color: var(--sand); }
.tag--fill { background: var(--orange); border-color: var(--orange); color: var(--brown); font-weight: 700; }

/* 按钮：切角 + 内嵌焦点环 */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  min-height: 44px;
  padding: .62em 1.2em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: .06em;
  text-decoration: none;
  cursor: pointer;
  background: var(--orange);
  color: var(--brown);
  border: 1px solid transparent;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
  transition: transform var(--t-fast) var(--ease), background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.btn::after {
  content: "";
  position: absolute;
  inset: 3px;
  border: 2px solid var(--focus);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-fast) var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:focus-visible { outline: none; }
.btn:focus-visible::after { opacity: 1; }
.btn--cta { background: var(--orange); color: var(--brown); }
.btn--cta:hover { background: #ff8347; }
.btn--ghost {
  background: transparent;
  color: var(--cyan);
  border-color: rgba(25, 227, 255, .5);
}
.btn--ghost:hover { background: var(--cyan); color: var(--ink-900); border-color: var(--cyan); }
.btn--line {
  background: transparent;
  color: var(--warm-white);
  border-color: rgba(201, 211, 216, .4);
}
.btn--line:hover { border-color: var(--cyan); color: var(--cyan); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--grayblue);
}
.breadcrumb a { color: var(--grayblue); text-decoration: none; transition: color var(--t-fast) var(--ease); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--warm-white); }
.breadcrumb-sep { color: var(--teal); }
.section--paper .breadcrumb, .section--paper .breadcrumb a { color: #6B5F56; }
.section--paper .breadcrumb [aria-current="page"] { color: var(--brown); }

.grid { display: grid; gap: clamp(16px, 3vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); }
.grid--stagger > *:nth-child(even) { margin-top: clamp(14px, 3vw, 36px); }

/* 入场显现 */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}
.js [data-reveal].is-revealed { opacity: 1; transform: none; }

/* ---------- 5. Skip link ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 12px;
  z-index: 300;
  padding: 12px 18px;
  background: var(--cyan);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  text-decoration: none;
  transition: top 160ms var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 6. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ink-900);
}

/* 6.1 顶部信号轨道 */
.header-rail {
  background: var(--ink-800);
  border-bottom: 1px solid rgba(201, 211, 216, .16);
}
.rail-inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad-x);
  min-height: 36px;
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--grayblue);
}
.rail-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--cyan);
  white-space: nowrap;
}
.rail-tag-dot {
  width: 6px;
  height: 6px;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(25, 227, 255, .9);
}
.rail-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--grayblue);
  white-space: nowrap;
}
.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 8px rgba(255, 106, 42, .9);
}

/* 6.2 快捷信号通道（桌面为轨道内联，移动端变底部信号坞） */
.signal-dock {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}
.signal-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 26px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: none;
  color: var(--warm-white);
  text-decoration: none;
  border: 1px solid rgba(201, 211, 216, .22);
  background: rgba(6, 26, 43, .55);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.chip-dot {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--chip, var(--cyan));
  box-shadow: 0 0 8px var(--chip, var(--cyan));
}
.signal-chip--cyan { --chip: var(--cyan); }
.signal-chip--orange { --chip: var(--orange); }
.signal-chip--red { --chip: var(--sig-red); }
.signal-chip:hover {
  border-color: var(--chip, var(--cyan));
  color: var(--chip, var(--cyan));
  transform: translateY(-1px);
}

/* 6.3 命令栏 */
.header-bar {
  background: var(--ink-900);
  border-bottom: 1px solid rgba(25, 227, 255, .34);
  background-image:
    repeating-linear-gradient(90deg, rgba(216, 179, 106, .16) 0 1px, transparent 1px 16px);
  background-size: 100% 6px;
  background-position: bottom left;
  background-repeat: no-repeat;
}
.bar-inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad-x);
  min-height: 66px;
  display: flex;
  align-items: center;
  gap: clamp(10px, 2.4vw, 30px);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
  text-decoration: none;
  color: var(--warm-white);
}
.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: none;
  background: linear-gradient(140deg, var(--ink-800), var(--ink-900));
  border: 1px solid rgba(25, 227, 255, .55);
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  transition: border-color var(--t-fast) var(--ease);
}
.brand-mark-line {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  box-shadow: 0 -7px 0 0 var(--sand), 0 7px 0 0 var(--orange);
  transition: box-shadow var(--t-fast) var(--ease);
}
.brand:hover .brand-mark { border-color: var(--orange); }
.brand:hover .brand-mark-line { box-shadow: 0 -7px 0 0 var(--orange), 0 7px 0 0 var(--cyan); }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: .06em;
  color: var(--warm-white);
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--teal);
}

/* 主导航 */
.primary-nav { flex: 1; min-width: 0; }
.nav-list { display: flex; align-items: stretch; gap: 2px; }
.nav-item { display: flex; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--grayblue);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--teal);
  transition: color var(--t-fast) var(--ease);
}
.nav-label { white-space: nowrap; }
.nav-link:hover { color: var(--warm-white); background: rgba(11, 42, 67, .85); }
.nav-link:hover .nav-index { color: var(--cyan); }
.nav-link[aria-current="page"] { color: var(--warm-white); background: rgba(25, 227, 255, .08); }
.nav-link[aria-current="page"] .nav-index { color: var(--cyan); }
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(25, 227, 255, .65);
}
.nav-foot {
  display: none;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: none;
  color: var(--grayblue);
}

/* 操作区与抽屉按钮 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex: none;
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  min-width: 44px;
  padding: 10px 12px;
  color: var(--warm-white);
  border: 1px solid rgba(201, 211, 216, .3);
  cursor: pointer;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.toggle-line {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
}
.toggle-line + .toggle-line { margin-top: 0; }
.nav-toggle { flex-wrap: wrap; }
.toggle-text {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
}

/* 阅读进度 */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(25, 227, 255, .1);
  pointer-events: none;
}
.read-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width 90ms linear;
}

/* ---------- 7. 页脚 ---------- */
.site-footer { position: relative; background: var(--ink-900); }

.footer-paper {
  position: relative;
  background: var(--cream);
  color: var(--brown);
  padding-block: clamp(40px, 6vw, 78px) clamp(32px, 4.5vw, 56px);
  clip-path: polygon(0 26px, 100% 0, 100% 100%, 0 100%);
}
.footer-paper::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 26px;
  background-image: repeating-linear-gradient(90deg, rgba(27, 21, 18, .22) 0 1px, transparent 1px 18px);
  border-bottom: 1px solid rgba(27, 21, 18, .14);
  pointer-events: none;
}
.footer-inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.35fr);
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}
.footer-brand-line {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--brown);
}
.footer-desc {
  margin-top: 14px;
  max-width: 38ch;
  font-size: 15px;
  line-height: 1.8;
  color: #3A322C;
}
.footer-signals {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}
.footer-signal {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 34px;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--brown);
  text-decoration: none;
  border: 1px solid rgba(27, 21, 18, .3);
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.footer-signal::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brown);
}
.footer-signal--cyan::before { background: var(--teal); }
.footer-signal--orange::before { background: var(--orange); }
.footer-signal--red::before { background: var(--sig-red); }
.footer-signal:hover { background: var(--brown); color: var(--cream); border-color: var(--brown); }

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 32px);
}
.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: #6B5F56;
  padding-bottom: 8px;
  margin-bottom: 10px;
  border-bottom: 1px solid rgba(27, 21, 18, .26);
}
.footer-links { display: grid; gap: 4px; }
.footer-links a {
  display: inline-block;
  padding: 4px 0;
  font-size: 15px;
  color: var(--brown);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.footer-links a:hover { color: #000; border-bottom-color: var(--orange); }

.footer-contact {
  margin-top: clamp(26px, 4vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
  gap: clamp(16px, 3vw, 34px);
  padding: clamp(18px, 3vw, 28px);
  background: var(--ink-900);
  color: var(--warm-white);
  border-left: 3px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}
.contact-head { display: flex; flex-direction: column; gap: 10px; }
.contact-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-note {
  font-size: 12px;
  line-height: 1.7;
  color: var(--grayblue);
}
.contact-list { display: grid; gap: 10px; align-content: start; }
.contact-item {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.6;
}
.contact-label {
  flex: none;
  min-width: 3.2em;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--teal);
}
.contact-value { color: var(--warm-white); word-break: break-word; }

.footer-base {
  background: var(--ink-900);
  border-top: 1px solid rgba(201, 211, 216, .16);
}
.footer-base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 24px;
  min-height: 64px;
  padding-block: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--grayblue);
}
.footer-icp { color: var(--grayblue); }
.footer-copy { color: var(--grayblue); }
.footer-domain { margin-left: auto; color: var(--teal); }

/* ---------- 8. 响应式 ---------- */
@media (max-width: 1080px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .nav-link { padding: 10px 9px; font-size: 13px; }
  .brand-sub { display: none; }
}

@media (max-width: 960px) {
  body { padding-bottom: 64px; }
  body.nav-open { overflow: hidden; }

  .rail-inner { min-height: 32px; gap: 12px; }
  .rail-status { font-size: 10px; letter-spacing: .08em; }

  /* 信号坞固定底部 */
  .signal-dock {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 120;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    background: var(--ink-800);
    border-top: 1px solid rgba(25, 227, 255, .38);
    box-shadow: 0 -12px 30px rgba(0, 0, 0, .45);
  }
  .signal-chip {
    justify-content: center;
    min-height: 60px;
    padding: 8px 6px;
    border: 0;
    border-right: 1px solid rgba(201, 211, 216, .14);
    background: transparent;
    font-size: 11px;
    letter-spacing: .06em;
  }
  .signal-chip:last-child { border-right: 0; }
  .signal-chip:hover { background: rgba(6, 26, 43, .9); transform: none; }

  /* 抽屉导航 */
  .js .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 95;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
    padding: 10px var(--pad-x) 26px;
    background: var(--ink-800);
    border-top: 1px solid rgba(25, 227, 255, .3);
    border-bottom: 1px solid rgba(201, 211, 216, .2);
    box-shadow: 0 24px 40px rgba(0, 0, 0, .45);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), visibility var(--t-mid) var(--ease);
  }
  .js .site-header[data-open] .primary-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }
  .js .nav-toggle { display: inline-flex; }
  .nav-list { flex-direction: column; gap: 0; }
  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 15px 4px;
    font-size: 17px;
    border-bottom: 1px solid rgba(201, 211, 216, .12);
  }
  .nav-link[aria-current="page"]::after {
    left: 0;
    right: auto;
    top: 12px;
    bottom: 12px;
    width: 3px;
    height: auto;
  }
  .nav-foot { display: block; }
  .header-actions .btn--cta { display: none; }
  .nav-toggle[aria-expanded="true"] .toggle-line:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .toggle-line:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] .toggle-line:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
  .toggle-line { transition: transform var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease); }
  .nav-toggle { row-gap: 5px; column-gap: 10px; }

  /* 页脚 */
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-contact { grid-template-columns: minmax(0, 1fr); }
  .footer-domain { margin-left: 0; }
}

@media (max-width: 720px) {
  .grid--2, .grid--3, .grid--split { grid-template-columns: minmax(0, 1fr); }
  .grid--stagger > *:nth-child(even) { margin-top: 0; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
  .footer-paper { clip-path: polygon(0 18px, 100% 0, 100% 100%, 0 100%); }
  .rail-status { display: none; }
  .brand-mark { width: 34px; height: 34px; }
  .brand-name { font-size: 16px; }
  .contact-label { min-width: 3em; }
}

@media (max-width: 420px) {
  .rail-tag { font-size: 10px; letter-spacing: .1em; }
  .signal-chip { font-size: 10px; letter-spacing: .02em; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 9. 动效与可访问性降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; transition: none; }
  .btn:hover, .signal-chip:hover { transform: none; }
}