/* ============================================================
   全站赛事 · Site Kit
   视觉母题：边陲夜赛指挥台 —— 深靛蓝夜幕 / 沙金数字 / 青绿状态
   ============================================================ */

/* ---------- 1. reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 120px;
}

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

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

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

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

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

hr { border: 0; border-top: 1px solid var(--line); margin: 0; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 色板 */
  --ink: #101A2E;
  --ink-deep: #0A0E16;
  --panel: #1B2942;
  --panel-soft: #22314C;
  --gold: #D7A447;
  --clay: #C5663B;
  --teal: #2FAF9A;
  --volt: #54E0C6;
  --paper: #EDE7D8;
  --mist: #8E97A8;
  --sand: #F0D9A8;

  /* 边界 */
  --line: rgba(237, 231, 216, 0.14);
  --line-soft: rgba(237, 231, 216, 0.08);
  --line-strong: rgba(237, 231, 216, 0.28);

  /* 字体 */
  --font-display: "Barlow Condensed", "Oswald", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", system-ui, sans-serif;
  --font-body: "Noto 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;

  /* 圆角：档案卡用大圆角，数据面板用小圆角 */
  --r-xl: 28px;
  --r-lg: 20px;
  --r-md: 14px;
  --r-sm: 10px;
  --r-pill: 999px;

  /* 尺寸与动效 */
  --shell: 1380px;
  --gutter: clamp(16px, 3.6vw, 52px);
  --dur: 160ms;
  --ease: cubic-bezier(0.24, 0.62, 0.36, 1);
  --focus: #54E0C6;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 560px at 82% -8%, rgba(47, 175, 154, 0.16), transparent 60%),
    radial-gradient(880px 520px at 4% 2%, rgba(197, 102, 59, 0.13), transparent 58%);
  background-repeat: no-repeat;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: clamp(15.5px, 0.55vw + 14px, 17px);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
}

h1 { font-size: clamp(2.4rem, 5vw, 5.2rem); }
h2 { font-size: clamp(1.8rem, 3vw, 2.8rem); }
h3 { font-size: clamp(1.15rem, 1.4vw, 1.42rem); letter-spacing: -0.01em; }

strong, b { font-weight: 700; color: var(--paper); }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

#main-content { scroll-margin-top: 120px; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 999;
  padding: 12px 20px;
  border-radius: var(--r-pill);
  background: var(--volt);
  color: #08131A;
  font-weight: 700;
  font-size: 0.9rem;
  transform: translateY(-180%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus-visible {
  transform: translateY(0);
  outline-offset: 4px;
}

/* ---------- 5. 头部外壳 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition:
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.site-header[data-scrolled="true"] {
  background: rgba(10, 14, 22, 0.93);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  backdrop-filter: blur(14px) saturate(1.15);
  border-bottom-color: rgba(215, 164, 71, 0.3);
  box-shadow: 0 20px 44px -32px rgba(0, 0, 0, 0.95);
}

/* 5.1 仪表细栏 */
.header-rail {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px var(--gutter);
  border-bottom: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.site-header[data-scrolled="true"] .header-rail {
  border-bottom-color: var(--line-soft);
  color: rgba(142, 151, 168, 0.95);
}

.rail-tag {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 4px rgba(47, 175, 154, 0.16);
}

.rail-text {
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rail-meta {
  margin-left: auto;
  white-space: nowrap;
  color: rgba(142, 151, 168, 0.75);
}

/* 5.2 主导航条 */
.header-bar {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.5vw, 32px);
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 13px var(--gutter) 15px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: var(--paper);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  border-radius: var(--r-md);
  background: linear-gradient(150deg, #E7B962, var(--gold) 42%, var(--clay));
  color: #0A0E16;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.2rem;
  letter-spacing: 0;
  line-height: 1;
  box-shadow: inset 0 0 0 1px rgba(10, 14, 22, 0.35), 0 10px 22px -16px rgba(215, 164, 71, 0.9);
  transition: transform var(--dur) var(--ease);
}

.brand:hover .brand-mark { transform: rotate(-4deg) scale(1.04); }

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

/* 5.3 导航 */
.site-nav { margin-left: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item { display: flex; }

.nav-link {
  display: inline-block;
  padding: 9px 13px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: 0.93rem;
  font-weight: 500;
  white-space: nowrap;
  color: rgba(237, 231, 216, 0.76);
  transition:
    color var(--dur) var(--ease),
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.nav-link:hover {
  color: var(--paper);
  background: rgba(237, 231, 216, 0.08);
  border-color: var(--line);
}

.nav-link[aria-current="page"] {
  color: #08131A;
  background: var(--volt);
  border-color: var(--volt);
  font-weight: 700;
}

.nav-link[aria-current="page"]:hover {
  background: #7BECDB;
  border-color: #7BECDB;
  color: #08131A;
}

/* 5.4 头部动作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid rgba(215, 164, 71, 0.55);
  border-radius: var(--r-pill);
  background: linear-gradient(180deg, rgba(215, 164, 71, 0.2), rgba(215, 164, 71, 0.06));
  color: #E7B962;
  font-size: 0.88rem;
  font-weight: 700;
  white-space: nowrap;
  transition:
    background var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.header-cta:hover {
  background: var(--gold);
  border-color: var(--gold);
  color: #0A0E16;
}

.cta-short { display: none; }

/* 5.5 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(237, 231, 216, 0.06);
  color: var(--paper);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover {
  background: rgba(84, 224, 198, 0.12);
  border-color: rgba(84, 224, 198, 0.5);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: background var(--dur) var(--ease);
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }

.nav-toggle-label { line-height: 1; }

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 130px);
  padding-top: clamp(44px, 6vw, 84px);
  background: var(--ink-deep);
  color: var(--paper);
  overflow: hidden;
  border-top: 1px solid rgba(215, 164, 71, 0.18);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--clay) 18%, var(--gold) 48%, var(--teal) 80%, transparent);
  opacity: 0.75;
}

.site-footer::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -34%;
  width: 62vw;
  height: 62vw;
  max-width: 900px;
  max-height: 900px;
  background: radial-gradient(circle, rgba(47, 175, 154, 0.14), transparent 62%);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(0, 0.75fr) minmax(0, 0.75fr) minmax(0, 1.25fr);
  gap: clamp(26px, 4vw, 58px);
  padding-bottom: clamp(32px, 5vw, 58px);
}

/* 6.1 页脚品牌 */
.footer-brand { min-width: 0; }

.footer-mark {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-md);
  background: linear-gradient(150deg, #E7B962, var(--gold) 42%, var(--clay));
  color: #0A0E16;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.1rem;
  line-height: 1;
}

.footer-name {
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.34rem;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.footer-claim {
  max-width: 34ch;
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--mist);
}

.footer-stamp {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 16px;
  padding: 5px 12px;
  border: 1px solid rgba(215, 164, 71, 0.35);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

/* 6.2 页脚栏目 */
.footer-col { min-width: 0; }

.footer-col-title {
  margin: 0 0 15px;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

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

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.93rem;
  color: rgba(237, 231, 216, 0.76);
  transition: color var(--dur) var(--ease);
}

.footer-links a::before {
  content: "";
  width: 5px;
  height: 5px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--teal);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer-links a:hover,
.footer-links a:focus-visible { color: var(--paper); }

.footer-links a:hover::before,
.footer-links a:focus-visible::before {
  opacity: 1;
  transform: translateX(0);
}

/* 6.3 页脚联系 */
.footer-contact { min-width: 0; }

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-row {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-bottom: 11px;
  border-bottom: 1px solid var(--line-soft);
}

.contact-row:last-child { border-bottom: 0; padding-bottom: 0; }

.contact-key {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.contact-val {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.contact-val--mono {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.03em;
  color: var(--sand);
}

/* 6.4 页脚法务条 */
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 28px;
  padding: 20px 0 28px;
  border-top: 1px solid var(--line-soft);
  font-size: 0.8rem;
  color: var(--mist);
}

.legal-icp {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  color: rgba(237, 231, 216, 0.62);
}

.legal-note {
  flex: 1 1 340px;
  min-width: 0;
  line-height: 1.68;
  color: rgba(142, 151, 168, 0.92);
}

.legal-mark {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: rgba(237, 231, 216, 0.42);
}

/* ---------- 7. 通用布局 ---------- */
.wrap {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(48px, 7vw, 100px); }
.section--tight { padding-block: clamp(26px, 4vw, 52px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 14px 24px;
  margin-bottom: clamp(20px, 3vw, 38px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.prose { max-width: 72ch; }
.prose p + p { margin-top: 1em; }
.prose a {
  color: var(--volt);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.prose ul,
.prose ol {
  padding-left: 1.25em;
  margin-top: 0.8em;
}
.prose li + li { margin-top: 0.4em; }

.grid {
  display: grid;
  gap: clamp(14px, 2vw, 26px);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr)); }

.stack {
  display: flex;
  flex-direction: column;
  gap: clamp(12px, 1.6vw, 20px);
}

.divider {
  height: 1px;
  border: 0;
  margin-block: clamp(20px, 3vw, 38px);
  background: linear-gradient(90deg, transparent, var(--line), transparent);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-family: var(--font-body);
  font-size: 0.94rem;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  cursor: pointer;
  transition:
    transform var(--dur) var(--ease),
    background var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.btn:hover { transform: translateY(-2px); }

.btn--solid {
  background: var(--gold);
  border-color: var(--gold);
  color: #0A0E16;
  box-shadow: 0 16px 30px -20px rgba(215, 164, 71, 0.95);
}

.btn--solid:hover {
  background: var(--sand);
  border-color: var(--sand);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--paper);
}

.btn--ghost:hover {
  border-color: var(--volt);
  color: var(--volt);
  background: rgba(84, 224, 198, 0.08);
}

.btn--teal {
  background: var(--teal);
  border-color: var(--teal);
  color: #06131A;
}

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

.btn--sm {
  padding: 9px 16px;
  font-size: 0.83rem;
}

/* ---------- 9. 面包屑 ---------- */
.crumb { padding: 20px 0 4px; }

.crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.crumb-list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.crumb-list li + li::before {
  content: "/";
  color: rgba(142, 151, 168, 0.45);
}

.crumb-list a { color: var(--mist); transition: color var(--dur) var(--ease); }
.crumb-list a:hover { color: var(--volt); }

.crumb-item[aria-current="page"] { color: var(--sand); }

/* ---------- 10. 卡片与面板 ---------- */
.card {
  position: relative;
  padding: clamp(20px, 2.6vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  background: linear-gradient(162deg, rgba(27, 41, 66, 0.96), rgba(10, 14, 22, 0.88));
  transition:
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.card:hover {
  border-color: rgba(84, 224, 198, 0.42);
  transform: translateY(-3px);
  box-shadow: 0 26px 48px -32px rgba(0, 0, 0, 0.95);
}

.panel {
  padding: clamp(16px, 2.2vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(27, 41, 66, 0.92), rgba(10, 14, 22, 0.72));
}

/* ---------- 11. 标签与数字 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--mist);
  white-space: nowrap;
}

.tag--gold {
  border-color: rgba(215, 164, 71, 0.5);
  background: rgba(215, 164, 71, 0.1);
  color: var(--gold);
}

.tag--teal {
  border-color: rgba(47, 175, 154, 0.5);
  background: rgba(47, 175, 154, 0.1);
  color: var(--teal);
}

.tag--clay {
  border-color: rgba(197, 102, 59, 0.55);
  background: rgba(197, 102, 59, 0.13);
  color: #E5915F;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.price {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold);
}

.price--xl { font-size: clamp(2.2rem, 4.4vw, 3.6rem); }

/* ---------- 12. 图片容器（页面阶段放置占位图） ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--r-xl);
  background: linear-gradient(150deg, var(--panel), var(--ink-deep));
  isolation: isolate;
}

.media-frame > img,
.media-frame > picture img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.06) brightness(0.94);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(196deg, rgba(16, 26, 46, 0) 42%, rgba(10, 14, 22, 0.7) 100%);
  pointer-events: none;
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame--strip {
  aspect-ratio: 21 / 9;
  border-radius: var(--r-md);
}

/* ---------- 13. 进入视口渐显（由 data-reveal 驱动） ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease);
}

[data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1119px) {
  .nav-toggle { display: inline-flex; }

  .header-actions { margin-left: auto; }

  .site-nav {
    display: none;
    position: absolute;
    left: 12px;
    right: 12px;
    top: calc(100% + 10px);
    margin-left: 0;
    padding: 16px;
    border: 1px solid var(--line-strong);
    border-radius: var(--r-xl);
    background: rgba(10, 14, 22, 0.985);
    box-shadow: 0 34px 70px -34px rgba(0, 0, 0, 0.95);
  }

  .site-nav[data-open] {
    display: block;
    animation: nav-drop 0.18s var(--ease) both;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 3px;
  }

  .nav-link {
    display: block;
    padding: 13px 16px;
    border-radius: var(--r-md);
    font-size: 1rem;
  }

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

  .footer-brand { grid-column: 1 / -1; }
}

@keyframes nav-drop {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 760px) {
  .brand-sub { display: none; }
  .rail-meta { display: none; }
  .rail-text { letter-spacing: 0.14em; }
  .header-bar { padding: 10px var(--gutter) 12px; }
  .brand-mark { width: 38px; height: 38px; font-size: 1.08rem; }
  .brand-name { font-size: 1.06rem; }
  .header-cta { padding: 9px 14px; font-size: 0.82rem; }
}

@media (max-width: 640px) {
  .cta-full { display: none; }
  .cta-short { display: inline; }
  .legal-mark { margin-left: 0; }
}

@media (max-width: 520px) {
  .nav-toggle { padding: 11px; gap: 0; }
  .nav-toggle-label { display: none; }
  .footer-main { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .media-frame--strip { aspect-ratio: 16 / 10; }
}

/* ---------- 15. 无障碍降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .card:hover,
  .btn:hover,
  .brand:hover .brand-mark {
    transform: none;
  }
}