/* ==========================================================================
   云开赛场 / SQUAD YUNKAI — 共享站点样式 site.css
   蓝图网格 · 命令栏头部 · 控制台式页脚
   ========================================================================== */

/* 01 — 设计令牌
   ========================================================================== */
:root {
  --navy-900: #0B1D33;
  --navy-700: #14304C;
  --teal-500: #2E9E92;
  --teal-200: #BFE3DD;
  --orange-500: #F26522;
  --orange-100: #FFE3D2;
  --lime-400: #C6FF4F;
  --paper: #F6F8F7;
  --ink: #101820;
  --grid-line: #C7D3D1;
  --neutral: #5A6B70;

  --font-display: "Archivo Black", "Source Han Sans SC Heavy", "Source Han Sans SC",
    "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo,
    Consolas, "Courier New", monospace;

  --shell-max: 1320px;
  --gutter: clamp(16px, 4vw, 44px);
  --radius: 14px;
  --radius-sm: 8px;
  --ease: cubic-bezier(.2, .7, .3, 1);
  --shadow-card: 0 18px 40px -26px rgba(11, 29, 51, .55);
}

/* 02 — Reset
   ========================================================================== */
*,
*::before,
*::after { box-sizing: border-box; }

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

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

ul, ol { padding: 0; list-style: none; }

img, svg, video, canvas { display: block; max-width: 100%; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a { color: inherit; text-decoration: none; }

input, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4 { font-weight: 400; line-height: 1.15; }

/* 03 — 基础排版与蓝图底纹
   ========================================================================== */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, rgba(199, 211, 209, .30) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(199, 211, 209, .30) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: -1px -1px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--teal-200);
  color: var(--navy-900);
}

:where(a, button, [tabindex], summary):focus-visible {
  outline: 3px solid var(--orange-500);
  outline-offset: 3px;
  border-radius: 3px;
}

#main-content { scroll-margin-top: 112px; }

/* 04 — 布局容器与通用网格
   ========================================================================== */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px);
}

.rule {
  border: 0;
  border-top: 1px solid var(--grid-line);
  margin-block: clamp(28px, 4vw, 48px);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: minmax(0, 3fr) minmax(0, 5fr); }
.grid--asym-wide { grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); }

/* 05 — 标题 / 数据 / 正文组件
   ========================================================================== */
.display-1 {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 6vw, 5.25rem);
  line-height: .98;
  letter-spacing: -.01em;
  color: var(--navy-900);
}

.h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.2vw, 2.75rem);
  line-height: 1.12;
  letter-spacing: -.005em;
  color: var(--navy-900);
}

.h3 {
  font-size: clamp(1.1rem, 1.7vw, 1.4rem);
  font-weight: 700;
  line-height: 1.32;
  color: var(--navy-900);
}

.data-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--navy-900);
}

.data-anchor {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(3.5rem, 12vw, 6.5rem);
  line-height: .85;
  letter-spacing: -.03em;
  color: var(--orange-500);
}

.label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--neutral);
}

.label--teal { color: var(--teal-500); }

.chapter {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 16px;
}

.chapter-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--teal-500);
}

.chapter-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--neutral);
}

.prose {
  max-width: 42em;
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
}

.prose p + p { margin-top: 1em; }

.prose strong { font-weight: 700; color: var(--navy-900); }

.prose a {
  color: var(--teal-500);
  border-bottom: 1px solid currentColor;
}

.prose a:hover { color: var(--navy-900); }

/* 06 — 面包屑
   ========================================================================== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--neutral);
}

.breadcrumb a {
  color: var(--neutral);
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.breadcrumb a:hover {
  color: var(--teal-500);
  border-bottom-color: var(--teal-500);
}

.breadcrumb-sep { color: var(--grid-line); }

.breadcrumb [aria-current="page"] { color: var(--navy-900); }

/* 07 — 按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 10px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.2;
  cursor: pointer;
  transition: background-color .18s var(--ease), color .18s var(--ease),
    border-color .18s var(--ease), transform .18s var(--ease);
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--orange-500);
  color: var(--navy-900);
}

.btn--primary:hover {
  background: #d9541a;
  color: var(--paper);
}

.btn--ghost {
  background: transparent;
  border-color: var(--teal-500);
  color: var(--navy-900);
}

.btn--ghost:hover {
  background: var(--teal-200);
  border-color: var(--teal-200);
}

.btn--dark {
  background: var(--navy-900);
  color: var(--paper);
}

.btn--dark:hover {
  background: var(--teal-500);
  color: var(--navy-900);
}

.btn--sm {
  padding: 8px 14px;
  font-size: 13px;
  border-radius: var(--radius-sm);
}

.btn--block { width: 100%; }

/* 08 — 面板 / 卡片 / 标签
   ========================================================================== */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  background: #FFFFFF;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
}

.panel--dark {
  background: var(--navy-900);
  border-color: var(--navy-700);
  color: var(--teal-200);
  background-image:
    linear-gradient(to right, rgba(199, 211, 209, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(199, 211, 209, .07) 1px, transparent 1px);
  background-size: 24px 24px;
}

.panel--dark .h3,
.panel--dark .data-num { color: var(--paper); }

.panel--tint {
  background: var(--teal-200);
  border-color: transparent;
}

.panel--warm {
  background: var(--orange-100);
  border-color: transparent;
}

.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  background: #FFFFFF;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease),
    border-color .24s var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--teal-500);
  box-shadow: var(--shadow-card);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  background: var(--paper);
  border: 1px solid var(--grid-line);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--navy-900);
  transition: background-color .18s var(--ease), border-color .18s var(--ease),
    color .18s var(--ease);
}

.chip:hover { border-color: var(--teal-500); }

.chip--active {
  background: var(--teal-500);
  border-color: var(--teal-500);
  color: var(--navy-900);
  font-weight: 700;
}

.chip--live {
  background: var(--navy-900);
  border-color: var(--navy-900);
  color: var(--lime-400);
  font-family: var(--font-mono);
  letter-spacing: .08em;
}

.badge-team {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--teal-200);
  color: var(--navy-900);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .02em;
}

/* 09 — 图片容器（供页面阶段放置 .media 内图片）
   ========================================================================== */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background-color: var(--navy-700);
  aspect-ratio: 16 / 10;
  isolation: isolate;
}

.media > img,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s var(--ease);
}

.media:hover > img,
.media:hover > picture > img { transform: scale(1.03); }

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media--bleed { border-radius: 0; }

.media-tag {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 2;
  padding: 5px 10px;
  border-radius: 999px;
  background: rgba(11, 29, 51, .84);
  color: var(--teal-200);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

/* 10 — 站点头部
   ========================================================================== */
.skip-link {
  position: absolute;
  left: 12px;
  top: -72px;
  z-index: 999;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--orange-500);
  color: var(--navy-900);
  font-size: 14px;
  font-weight: 700;
  transition: top .18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--paper);
  border-bottom: 1px solid var(--grid-line);
}

/* 10.1 状态条 */
.header-strip {
  background: var(--navy-900);
  color: var(--teal-200);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

.header-strip-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  min-height: 30px;
  padding-block: 5px;
}

.strip-live {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
}

.strip-label {
  color: var(--lime-400);
  font-weight: 700;
}

.strip-mono { font-variant-numeric: tabular-nums; }

.strip-meta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: rgba(191, 227, 221, .72);
}

.strip-sep { color: var(--teal-500); }

.live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime-400);
  box-shadow: 0 0 0 0 rgba(198, 255, 79, .55);
  animation: yk-pulse 1.8s ease-in-out infinite;
}

@keyframes yk-pulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(198, 255, 79, .55); }
  50%      { transform: scale(1.35); box-shadow: 0 0 0 6px rgba(198, 255, 79, 0); }
}

/* 10.2 命令栏 */
.command-bar {
  position: relative;
  background: var(--paper);
}

.command-inner {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 28px);
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
}

.brand-cube {
  width: 16px;
  height: 16px;
  border-radius: 3px;
  background: var(--teal-500);
  box-shadow: 4px 4px 0 0 var(--teal-200);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-cn {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: -.01em;
  color: var(--ink);
}

.brand-en {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--neutral);
}

/* 10.3 导航 */
.primary-nav { margin-inline: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 1vw, 14px);
}

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 9px 7px 13px;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--ink);
  white-space: nowrap;
  transition: background-color .18s var(--ease), color .18s var(--ease);
}

.nav-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 4px;
  height: 18px;
  border-radius: 2px;
  background: var(--teal-500);
  transform: translateY(-50%) scaleY(0);
  transform-origin: center;
  transition: transform .18s var(--ease);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .06em;
  color: var(--neutral);
  transition: color .18s var(--ease);
}

.nav-link:hover { background: rgba(46, 158, 146, .10); }

.nav-link:hover::before,
.nav-link[aria-current="page"]::before {
  transform: translateY(-50%) scaleY(1);
}

.nav-link[aria-current="page"] {
  font-weight: 700;
  color: var(--navy-900);
}

.nav-link[aria-current="page"] .nav-index {
  color: var(--teal-500);
  font-weight: 700;
}

/* 10.4 命令栏右侧 */
.command-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: auto;
  flex: 0 0 auto;
}

.follow-count {
  display: flex;
  align-items: baseline;
  gap: 5px;
  font-size: 12px;
  color: var(--neutral);
}

.follow-num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--navy-900);
  font-variant-numeric: tabular-nums;
}

.follow-label { letter-spacing: .04em; }

/* 10.5 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius-sm);
  background: var(--paper);
  color: var(--navy-900);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
}

.nav-toggle:hover { border-color: var(--teal-500); }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 12px;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--navy-900);
  transition: transform .2s var(--ease);
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }

.site-header[data-open] .nav-toggle-bars::before {
  transform: translateY(5px) rotate(45deg);
}

.site-header[data-open] .nav-toggle-bars::after {
  transform: translateY(-5px) rotate(-45deg);
}

/* 10.6 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
}

.scroll-progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--teal-500), var(--lime-400));
  transition: width .1s linear;
}

/* 11 — 站点页脚
   ========================================================================== */
.site-footer {
  position: relative;
  padding-top: clamp(40px, 6vw, 72px);
  background-color: var(--navy-900);
  color: var(--teal-200);
  background-image:
    linear-gradient(to right, rgba(199, 211, 209, .09) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(199, 211, 209, .09) 1px, transparent 1px);
  background-size: 24px 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.5fr);
  gap: clamp(26px, 3.4vw, 52px);
  padding-block: 0 clamp(32px, 4vw, 48px);
  border-bottom: 1px solid rgba(199, 211, 209, .16);
}

.footer-brand .brand { margin-bottom: 16px; }

.brand--footer .brand-cn { color: var(--paper); }
.brand--footer .brand-en { color: rgba(191, 227, 221, .62); }

.footer-tagline {
  max-width: 24em;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(246, 248, 247, .78);
}

.footer-coord {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: rgba(191, 227, 221, .55);
}

.footer-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding: 9px 14px;
  border: 1px solid rgba(46, 158, 146, .55);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 700;
  color: var(--teal-200);
  transition: background-color .18s var(--ease), color .18s var(--ease),
    border-color .18s var(--ease);
}

.footer-cta::after {
  content: "";
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 6px solid currentColor;
}

.footer-cta:hover {
  background: var(--teal-500);
  border-color: var(--teal-500);
  color: var(--navy-900);
}

.footer-col { padding-top: 6px; }

.footer-heading {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--teal-500);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
}

.footer-links a {
  color: rgba(246, 248, 247, .82);
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.footer-links a:hover {
  color: var(--lime-400);
  border-bottom-color: var(--lime-400);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 13px;
  line-height: 1.6;
}

.footer-contact li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.fc-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: rgba(191, 227, 221, .58);
}

.fc-value {
  color: var(--paper);
  word-break: break-word;
}

.fc-note {
  font-size: 12px;
  color: rgba(191, 227, 221, .55);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-block: 22px clamp(26px, 4vw, 40px);
}

.footer-legal {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(191, 227, 221, .66);
}

.footer-icp { color: rgba(246, 248, 247, .8); }

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 12px;
}

.footer-legal-links a {
  color: rgba(191, 227, 221, .72);
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-bottom-color .18s var(--ease);
}

.footer-legal-links a:hover {
  color: var(--lime-400);
  border-bottom-color: var(--lime-400);
}

/* 12 — 返回顶部控制台按钮（由 site.js 注入）
   ========================================================================== */
.back-to-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 32px);
  z-index: 150;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--navy-700);
  border-radius: 10px;
  background: var(--navy-900);
  color: var(--teal-200);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  box-shadow: 0 16px 32px -18px rgba(11, 29, 51, .85);
  transition: opacity .24s var(--ease), transform .24s var(--ease),
    visibility .24s var(--ease), background-color .18s var(--ease),
    color .18s var(--ease);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--teal-500);
  border-color: var(--teal-500);
  color: var(--navy-900);
}

.back-to-top-icon {
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 7px solid currentColor;
}

.back-to-top-text { line-height: 1; }

/* 13 — 响应式：平板
   ========================================================================== */
@media (max-width: 1000px) {
  .command-inner {
    flex-wrap: wrap;
    min-height: 62px;
    padding-block: 10px;
  }

  .brand { margin-right: auto; }
  .follow-count { display: none; }

  .nav-toggle { display: inline-flex; }

  .command-actions {
    order: 3;
    margin-left: 0;
    gap: 10px;
  }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 5;
    display: none;
    padding: 14px max(var(--gutter), calc((100vw - var(--shell-max)) / 2 + var(--gutter))) 26px;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
    background: var(--navy-900);
    border-top: 1px solid var(--navy-700);
    box-shadow: 0 28px 44px -22px rgba(11, 29, 51, .7);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    display: flex;
    padding: 13px 12px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    color: rgba(246, 248, 247, .88);
  }

  .nav-index { color: var(--teal-500); }

  .nav-link:hover { background: rgba(46, 158, 146, .18); }

  .nav-link[aria-current="page"] { color: var(--paper); }

  .nav-link[aria-current="page"] .nav-index { color: var(--lime-400); }

  .grid--asym,
  .grid--asym-wide { grid-template-columns: minmax(0, 1fr); }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* 14 — 响应式：手机
   ========================================================================== */
@media (max-width: 640px) {
  body {
    font-size: 16px;
    line-height: 1.8;
  }

  .header-strip { font-size: 10px; }
  .strip-meta { display: none; }

  .command-inner { min-height: 58px; gap: 8px; }
  .brand-cn { font-size: 17px; }
  .brand-en { font-size: 9px; letter-spacing: .14em; }

  .command-actions .btn { padding: 7px 11px; font-size: 12px; }

  .grid--2 { grid-template-columns: minmax(0, 1fr); }
  .grid--asym,
  .grid--asym-wide { grid-template-columns: minmax(0, 1fr); }

  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .footer-base { flex-direction: column; align-items: flex-start; }

  #main-content { scroll-margin-top: 96px; }
}

/* 15 — 降低动效
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .card:hover,
  .btn:hover,
  .media:hover > img { transform: none; }
}