/* =========================================================
   天博赛场 V4 · 共享样式 /assets/site.css
   深空蓝底 · 蓝图网格 · 青柠强调 · 粗野主义卡片
   ========================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
[id] { scroll-margin-top: 112px; }

/* ---------- 2. 变量 ---------- */
:root {
  --space-900: #0A1730;
  --midnight: #142A4C;
  --line: #2E4A78;
  --lime: #C6FF3E;
  --amber: #FF8B2E;
  --signal: #FF5468;
  --mist: #8FAEDC;
  --paper-white: #F4F7FF;
  --paper: #E6EBF4;
  --graphite: #0D1117;

  --shell-max: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --pill: 999px;
  --card-radius: 18px;

  --font-display: "Inter", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;

  --shadow-hard: 6px 6px 0 rgba(13, 17, 23, 0.65);
  --shadow-hard-lg: 10px 14px 0 rgba(13, 17, 23, 0.72);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* ---------- 3. 中文排版与基底 ---------- */
body {
  background-color: var(--space-900);
  background-image:
    linear-gradient(rgba(46, 74, 120, 0.20) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 74, 120, 0.20) 1px, transparent 1px),
    radial-gradient(120% 70% at 78% -10%, rgba(46, 74, 120, 0.55) 0%, rgba(10, 23, 48, 0) 62%);
  background-size: 64px 64px, 64px 64px, 100% 100%;
  color: var(--paper-white);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: 0.01em;
  min-height: 100vh;
  overflow-x: hidden;
}
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 900; line-height: 1.08; letter-spacing: -0.02em; }
p { text-wrap: pretty; }

.display-1 { font-family: var(--font-display); font-weight: 900; font-size: clamp(44px, 9vw, 156px); line-height: 0.9; letter-spacing: -0.035em; }
.display-2 { font-family: var(--font-display); font-weight: 900; font-size: clamp(32px, 5.2vw, 76px); line-height: 0.98; letter-spacing: -0.028em; }
.display-3 { font-family: var(--font-display); font-weight: 900; font-size: clamp(22px, 3.2vw, 42px); line-height: 1.12; letter-spacing: -0.02em; }
.label, .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}
.num { font-family: var(--font-mono); font-weight: 600; font-variant-numeric: tabular-nums; }
.prose { max-width: 68ch; font-size: 17px; line-height: 1.85; }
.prose p + p { margin-top: 1.1em; }
.prose a { color: var(--lime); text-decoration: none; border-bottom: 1px solid rgba(198, 255, 62, 0.45); }
.prose a:hover { border-bottom-color: var(--lime); }

/* ---------- 4. 焦点与可达性 ---------- */
:focus-visible { outline: 2px solid var(--lime); outline-offset: 3px; border-radius: 6px; }
.skip-link {
  position: fixed; top: 12px; left: 12px; z-index: 200;
  padding: 10px 18px; border-radius: var(--pill);
  background: var(--lime); color: var(--space-900);
  font-size: 14px; font-weight: 800; text-decoration: none;
  transform: translateY(-180%);
  transition: transform 0.24s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 5. 布局骨架 ---------- */
.shell { width: 100%; max-width: var(--shell-max); margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: clamp(48px, 7vw, 96px) 0; }
.section-head {
  display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between;
  gap: 18px; margin-bottom: clamp(20px, 3vw, 34px);
}
.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.card-grid { display: grid; gap: clamp(16px, 2.4vw, 28px); grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.slash { display: block; height: 16px; border: 0; margin: 0;
  background: repeating-linear-gradient(115deg, var(--line) 0 1px, transparent 1px 13px); }
.grid-veil {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(46, 74, 120, 0.45) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 74, 120, 0.45) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(90% 80% at 20% 0%, #000 0%, transparent 78%);
  mask-image: radial-gradient(90% 80% at 20% 0%, #000 0%, transparent 78%);
  opacity: 0.55;
}
.surface-light { background: var(--paper); color: var(--space-900); }
.surface-light .label, .surface-light .eyebrow { color: #3A5A88; }
.surface-light .prose a { color: #1E3E6B; border-bottom-color: rgba(30, 62, 107, 0.4); }

/* ---------- 6. 按钮与标签 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 22px; border: 2px solid var(--line); border-radius: var(--pill);
  background: var(--midnight); color: var(--paper-white);
  font-size: 15px; font-weight: 700; letter-spacing: 0.02em;
  text-decoration: none; cursor: pointer;
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease), border-color 0.22s, background 0.22s, color 0.22s;
}
.btn:hover { transform: translate(-2px, -2px); border-color: var(--lime); color: var(--lime); }
.btn--primary {
  background: var(--lime); border-color: var(--lime); color: var(--space-900);
  box-shadow: 4px 4px 0 rgba(13, 17, 23, 0.7);
}
.btn--primary:hover { color: var(--space-900); box-shadow: 6px 6px 0 rgba(13, 17, 23, 0.78); }
.btn--ghost { background: transparent; }
.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.42; cursor: not-allowed; transform: none !important; box-shadow: none;
  border-color: var(--line); color: var(--mist);
}
.tag {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 4px 12px; border: 1px solid var(--line); border-radius: var(--pill);
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--mist);
}
.tag--live { color: var(--signal); border-color: rgba(255, 84, 104, 0.5); }
.tag--live::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--signal); animation: tb-pulse 1.6s ease-in-out infinite;
}
@keyframes tb-pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.2; } }

/* ---------- 7. 面包屑 ---------- */
.breadcrumbs {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--mist);
}
.breadcrumbs li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs li::after { content: "/"; color: var(--line); }
.breadcrumbs li:last-child::after { content: ""; }
.breadcrumbs a { color: var(--mist); text-decoration: none; transition: color 0.2s; }
.breadcrumbs a:hover { color: var(--lime); }
.breadcrumbs [aria-current="page"] { color: var(--paper-white); }

/* ---------- 8. 卡片 / 图片容器 / 数据块 ---------- */
.card {
  position: relative; display: flex; flex-direction: column; gap: 14px;
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--midnight);
  border: 2px solid var(--line); border-radius: var(--card-radius);
  box-shadow: var(--shadow-hard);
  transition: transform 0.28s var(--ease), border-color 0.28s, box-shadow 0.28s;
}
.card:hover { transform: translate(-3px, -5px); border-color: var(--lime); box-shadow: var(--shadow-hard-lg); }
.card-title { font-family: var(--font-display); font-weight: 900; font-size: clamp(19px, 1.6vw, 24px); line-height: 1.25; }
.card-meta { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; color: var(--mist); }

.media {
  position: relative; display: block; overflow: hidden;
  aspect-ratio: 16 / 10; border: 2px solid var(--line); border-radius: 14px;
  background: linear-gradient(150deg, var(--midnight), var(--space-900));
}
.media img { width: 100%; height: 100%; object-fit: cover; }
.media::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(200deg, rgba(198, 255, 62, 0.16), transparent 46%, rgba(10, 23, 48, 0.6));
}
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }
.media-caption { display: block; margin-top: 10px; font-size: 13px; line-height: 1.7; color: var(--mist); }

.stat { display: flex; flex-direction: column; gap: 6px; }
.stat__value { font-family: var(--font-mono); font-weight: 600; font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 5vw, 62px); line-height: 1; color: var(--paper-white); }
.stat__label { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--mist); }
.stat__delta { font-family: var(--font-mono); font-size: 12px; font-weight: 600; color: var(--amber); }
.stat__delta--down { color: var(--signal); }

/* ---------- 9. 编辑部目录 / 粘性锚点 ---------- */
.index-list { counter-reset: tb-idx; border-top: 1px solid var(--line); }
.index-item {
  display: grid; grid-template-columns: auto 1fr auto; align-items: baseline; gap: 16px;
  padding: 16px 4px; border-bottom: 1px dashed var(--line);
}
.index-item::before {
  counter-increment: tb-idx; content: counter(tb-idx, decimal-leading-zero);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; color: var(--lime);
}
.index-item a { color: var(--paper-white); font-weight: 700; text-decoration: none; transition: color 0.2s; }
.index-item a:hover { color: var(--lime); }
.index-item span { font-family: var(--font-mono); font-size: 12px; color: var(--mist); }

.anchor-nav { position: sticky; top: 112px; align-self: start; border-left: 2px solid var(--line); padding-left: 16px; }
.anchor-nav a { display: block; padding: 8px 0; color: var(--mist); font-size: 14px; text-decoration: none; transition: color 0.2s, transform 0.2s; }
.anchor-nav a:hover { color: var(--paper-white); transform: translateX(3px); }
.anchor-nav a[aria-current="true"] { color: var(--lime); font-weight: 700; }

/* ---------- 10. 滚动入场 ---------- */
[data-reveal] { opacity: 0; transform: translateY(12px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
[data-reveal].is-visible { opacity: 1; transform: none; }
html:not(.js-ready) [data-reveal] { opacity: 1; transform: none; }

/* =========================================================
   11. 头部：悬浮胶囊导航浮岛
   ========================================================= */
.site-header {
  position: sticky; top: 0; z-index: 80;
  padding: 12px var(--gutter) 0;
  background: linear-gradient(180deg, rgba(10, 23, 48, 0.97) 0%, rgba(10, 23, 48, 0.84) 64%, rgba(10, 23, 48, 0) 100%);
}
.header-shell { position: relative; max-width: var(--shell-max); margin: 0 auto; }
.header-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  padding: 10px 12px 10px 20px;
  border: 1px solid var(--line); border-radius: var(--pill);
  background-color: rgba(20, 42, 76, 0.76);
  background-image:
    linear-gradient(rgba(46, 74, 120, 0.24) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 74, 120, 0.24) 1px, transparent 1px);
  background-size: 26px 26px;
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  box-shadow: 0 24px 48px -32px rgba(13, 17, 23, 0.98), inset 0 1px 0 rgba(244, 247, 255, 0.06);
  transition: padding 0.32s var(--ease), background-color 0.32s var(--ease),
              border-color 0.32s var(--ease), box-shadow 0.32s var(--ease);
}
.site-header[data-stuck="true"] .header-inner {
  padding: 6px 10px 6px 16px;
  background-color: rgba(20, 42, 76, 0.96);
  border-color: rgba(198, 255, 62, 0.42);
  box-shadow: 0 28px 44px -28px rgba(13, 17, 23, 1);
}

.brand { display: inline-flex; align-items: center; gap: 12px; min-width: 0; text-decoration: none; color: var(--paper-white); }
.brand-mark {
  position: relative; flex: 0 0 auto; width: 34px; height: 34px;
  border: 2px solid var(--lime); border-radius: 10px;
  display: grid; place-items: center;
  background: linear-gradient(140deg, rgba(198, 255, 62, 0.22), rgba(10, 23, 48, 0) 72%);
}
.brand-mark__ring { width: 13px; height: 13px; border: 2px solid var(--lime); border-radius: 50%; }
.brand-mark__dot {
  position: absolute; top: 4px; right: 4px; width: 6px; height: 6px;
  border-radius: 50%; background: var(--amber); box-shadow: 0 0 0 2px rgba(10, 23, 48, 0.9);
}
.brand-text { display: flex; align-items: baseline; gap: 8px; min-width: 0; }
.brand-name { font-family: var(--font-display); font-weight: 900; font-size: clamp(18px, 2.1vw, 22px); letter-spacing: -0.01em; white-space: nowrap; }
.brand-ver {
  font-family: var(--font-mono); font-size: 11px; font-weight: 700; letter-spacing: 0.16em;
  color: var(--space-900); background: var(--lime); padding: 2px 7px; border-radius: 6px;
}

.nav-toggle {
  display: none; align-items: center; gap: 9px;
  padding: 9px 16px 9px 13px;
  border: 1px solid var(--line); border-radius: var(--pill);
  background: rgba(10, 23, 48, 0.6); color: var(--paper-white);
  font-size: 13px; font-weight: 700; letter-spacing: 0.08em; cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.nav-toggle:hover { border-color: var(--lime); color: var(--lime); }
.nav-toggle__bars { display: grid; gap: 3px; width: 18px; }
.nav-toggle__bars i { display: block; height: 2px; border-radius: 2px; background: currentColor;
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.site-nav { display: flex; align-items: center; gap: 10px; min-width: 0; }
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-link {
  display: inline-flex; align-items: center;
  padding: 9px 15px; border: 1px solid transparent; border-radius: var(--pill);
  color: var(--mist); font-size: 14px; font-weight: 600; line-height: 1.2;
  text-decoration: none; white-space: nowrap;
  transition: color 0.2s, background 0.2s, border-color 0.2s;
}
.nav-link:hover { color: var(--paper-white); background: rgba(46, 74, 120, 0.62); border-color: var(--line); }
.nav-link[aria-current="page"] {
  color: var(--lime);
  background: rgba(198, 255, 62, 0.12);
  border-color: rgba(198, 255, 62, 0.5);
}
.nav-link[aria-current="page"]::before {
  content: ""; width: 6px; height: 6px; margin-right: 8px; border-radius: 50%;
  background: var(--lime); box-shadow: 0 0 10px rgba(198, 255, 62, 0.9);
}
.nav-cta {
  display: inline-flex; align-items: center; gap: 8px;
  margin-left: 6px; padding: 11px 20px; border-radius: var(--pill);
  background: var(--lime); color: var(--space-900);
  font-size: 14px; font-weight: 800; letter-spacing: 0.02em; text-decoration: none; white-space: nowrap;
  box-shadow: 4px 4px 0 rgba(13, 17, 23, 0.55);
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease), background 0.22s;
}
.nav-cta::after {
  content: ""; width: 7px; height: 7px; border-right: 2px solid currentColor; border-top: 2px solid currentColor;
  transform: rotate(45deg);
}
.nav-cta:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 rgba(13, 17, 23, 0.62); }

.scroll-track {
  position: relative; height: 2px; margin: 9px 16px 0;
  border-radius: 2px; background: rgba(46, 74, 120, 0.6); overflow: hidden;
}
.scroll-bar { display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--lime), var(--amber) 70%, var(--signal)); border-radius: 2px; }

/* =========================================================
   12. 页脚：石墨黑终端面板
   ========================================================= */
.site-footer {
  position: relative; margin-top: clamp(56px, 8vw, 110px);
  background: var(--graphite); color: var(--paper-white);
  border-top: 2px solid var(--line);
}
.site-footer::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(46, 74, 120, 0.38) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 74, 120, 0.38) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 78%);
}
.footer-rail { height: 3px; background: linear-gradient(90deg, var(--lime) 0%, var(--amber) 52%, var(--signal) 100%); }
.footer-inner {
  position: relative; z-index: 1;
  max-width: var(--shell-max); margin: 0 auto;
  padding: clamp(36px, 5vw, 64px) var(--gutter) 28px;
}
.footer-grid { display: grid; grid-template-columns: 1.3fr 0.8fr 1fr 1.4fr; gap: clamp(24px, 4vw, 56px); }

.footer-wordmark { font-family: var(--font-display); font-weight: 900; font-size: clamp(24px, 3vw, 34px); letter-spacing: -0.01em; }
.footer-ver { margin-top: 10px; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; color: var(--mist); }
.footer-ver__tag {
  display: inline-block; margin-right: 8px; padding: 2px 7px; border-radius: 5px;
  background: var(--lime); color: var(--space-900); font-weight: 700;
}
.footer-note { margin-top: 14px; font-size: 14px; line-height: 1.75; color: var(--mist); }
.footer-title {
  margin-bottom: 14px; font-family: var(--font-mono); font-size: 12px; font-weight: 600;
  letter-spacing: 0.2em; text-transform: uppercase; color: var(--lime);
}
.footer-list { display: grid; gap: 9px; }
.footer-list a { position: relative; color: var(--paper-white); font-size: 14px; text-decoration: none; transition: color 0.2s; }
.footer-list a::before { content: "—"; margin-right: 8px; color: var(--line); transition: color 0.2s; }
.footer-list a:hover { color: var(--lime); }
.footer-list a:hover::before { color: var(--lime); }
.footer-hint { margin-top: 14px; font-size: 12.5px; line-height: 1.7; color: var(--mist); }

.contact-list { display: grid; gap: 10px; }
.contact-row { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px; font-size: 13.5px; }
.contact-key {
  flex: 0 0 auto; font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--line);
}
.contact-val { flex: 1 1 auto; min-width: 0; color: var(--paper-white); word-break: break-word; line-height: 1.6; }
.copy-btn {
  flex: 0 0 auto; padding: 5px 12px; border: 1px solid var(--line); border-radius: var(--pill);
  background: transparent; color: var(--mist);
  font-size: 12px; font-weight: 600; letter-spacing: 0.06em; cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.copy-btn:hover { border-color: var(--lime); color: var(--lime); }
.copy-btn.is-copied { border-color: var(--lime); background: var(--lime); color: var(--space-900); }
.footer-icp { margin-top: 14px; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.08em; color: var(--mist); }

.footer-bottom {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px;
  margin-top: clamp(28px, 4vw, 48px); padding-top: 20px; border-top: 1px solid var(--line);
}
.footer-copy { font-family: var(--font-mono); font-size: 12.5px; letter-spacing: 0.06em; color: var(--mist); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-legal a { color: var(--mist); font-size: 13px; text-decoration: none; transition: color 0.2s; }
.footer-legal a:hover { color: var(--lime); }

/* =========================================================
   13. 响应式
   ========================================================= */
@media (max-width: 1100px) {
  .nav-link { padding: 8px 11px; font-size: 13px; }
  .nav-cta { padding: 10px 16px; font-size: 13px; }
  .footer-grid { grid-template-columns: 1.2fr 1fr 1.2fr; }
  .footer-block:nth-child(4) { grid-column: 1 / -1; }
}

@media (max-width: 960px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: absolute; left: 0; right: 0; top: calc(100% + 10px);
    flex-direction: column; align-items: stretch; gap: 6px;
    max-height: min(74vh, 560px); overflow-y: auto; overscroll-behavior: contain;
    padding: 14px;
    border: 2px solid var(--line); border-radius: 20px;
    background: rgba(13, 28, 54, 0.98);
    box-shadow: var(--shadow-hard-lg);
    opacity: 0; visibility: hidden; transform: translateY(-10px) scale(0.985); transform-origin: top center;
    transition: opacity 0.24s var(--ease), transform 0.24s var(--ease), visibility 0.24s;
  }
  .site-nav[data-open="true"] { opacity: 1; visibility: visible; transform: none; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav-link { padding: 14px 16px; border-radius: 14px; font-size: 15px; }
  .nav-cta { margin: 8px 0 0; justify-content: center; padding: 14px 20px; font-size: 15px; }
  .scroll-track { margin: 9px 12px 0; }
  .index-item { grid-template-columns: auto 1fr; }
  .index-item span { grid-column: 2; }
  .card-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .anchor-nav { position: static; border-left: 0; border-top: 1px solid var(--line); padding: 12px 0 0; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer-block:nth-child(1), .footer-block:nth-child(4) { grid-column: 1 / -1; }
  .card-grid--3 { grid-template-columns: 1fr; }
  .card:hover { transform: translate(-2px, -3px); }
}

@media (max-width: 480px) {
  .brand-ver { display: none; }
  .brand-name { font-size: 17px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .contact-row { font-size: 13px; }
}

/* =========================================================
   14. 动效降级
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .card:hover, .btn:hover, .nav-cta:hover { transform: none; }
  .index-item a:hover, .anchor-nav a:hover { transform: none; }
}