/* ===========================================================
   火博看台 · 共享样式表  /assets/site.css
   层：深色底 → 玻璃浮层 → 云白实色内容层
   =========================================================== */

*, *::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, li, figure, figcaption, blockquote, dl, dd {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }

:root {
  --flame: #FF5A1F;
  --flame-soft: #FF7B45;
  --navy: #0B1B3A;
  --navy-deep: #071229;
  --indigo: #14306B;
  --sky: #1E9BFF;
  --sky-deep: #1170C4;
  --jade: #00A88F;
  --gold: #F5C542;
  --vermillion: #E0362C;
  --cloud: #F7F4EF;
  --graphite: #2A2F3A;

  --glass: rgba(255, 255, 255, 0.10);
  --glass-strong: rgba(255, 255, 255, 0.16);
  --glass-line: rgba(255, 255, 255, 0.22);
  --hairline: rgba(11, 27, 58, 0.12);

  --shadow-1: 0 4px 14px rgba(4, 10, 24, 0.18);
  --shadow-2: 0 18px 40px rgba(4, 10, 24, 0.38);

  --shell: 1280px;
  --header-offset: clamp(86px, 9vw, 112px);
  --radius-pill: 999px;
  --radius-card: 18px;

  --font-display: "Source Han Sans SC", "Noto 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", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

[id] { scroll-margin-top: calc(var(--header-offset) + 18px); }

body {
  min-height: 100vh;
  padding-top: var(--header-offset);
  background: var(--navy);
  color: var(--cloud);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

h1 { font-size: clamp(34px, 5vw, 58px); }
h2 { font-size: clamp(28px, 3.6vw, 44px); }
h3 { font-size: clamp(20px, 2.2vw, 26px); letter-spacing: -0.01em; }
h4 { font-size: 18px; font-weight: 800; }
p { max-width: 68ch; }
strong { font-weight: 800; }

::selection { background: var(--flame); color: var(--navy); }

:focus-visible {
  outline: 2px solid var(--sky);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 跳至主要内容 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: clamp(14px, 3vw, 32px);
  z-index: 200;
  padding: 11px 20px;
  border-radius: 0 0 16px 16px;
  background: var(--flame);
  color: var(--navy);
  font-weight: 800;
  font-size: 15px;
  transition: top 0.18s var(--ease);
}
.skip-link:focus { top: 0; }

/* ===========================================================
   页头：悬浮胶囊导航
   =========================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding: clamp(10px, 1.6vw, 18px) clamp(14px, 3vw, 32px);
  pointer-events: none;
}

.header-shell {
  position: relative;
  pointer-events: auto;
  max-width: var(--shell);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 26px);
  padding: 10px 14px 10px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-line);
  background:
    linear-gradient(180deg, rgba(11, 27, 58, 0.78), rgba(9, 22, 46, 0.90)),
    var(--glass);
  -webkit-backdrop-filter: blur(16px) saturate(1.25);
  backdrop-filter: blur(16px) saturate(1.25);
  box-shadow: 0 18px 40px rgba(3, 8, 20, 0.48);
  transition: padding 0.22s var(--ease), background 0.22s var(--ease);
}

.brand {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 12px 4px 4px;
  border-radius: var(--radius-pill);
  color: var(--cloud);
  transition: background 0.2s var(--ease);
}
.brand:hover { background: rgba(255, 255, 255, 0.08); }

.brand-mark {
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  background: linear-gradient(140deg, var(--flame), #FF8A3D);
  box-shadow: 0 8px 20px rgba(255, 90, 31, 0.34);
  transition: width 0.22s var(--ease), height 0.22s var(--ease), border-radius 0.22s var(--ease);
}

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: -0.02em;
}
.brand-tagline {
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: rgba(247, 244, 239, 0.66);
}

.primary-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
  min-width: 0;
}
.nav-list { display: flex; align-items: center; gap: 2px; }

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 9px 15px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  white-space: nowrap;
  color: rgba(247, 244, 239, 0.80);
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}
.nav-link:hover { background: rgba(255, 255, 255, 0.10); color: var(--cloud); }
.nav-link[aria-current="page"] {
  background: var(--flame);
  color: var(--navy);
  font-weight: 800;
  box-shadow: 0 6px 18px rgba(255, 90, 31, 0.32);
}

.nav-cta {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 800;
  color: var(--flame);
  background: rgba(255, 90, 31, 0.12);
  border: 1px solid rgba(255, 90, 31, 0.55);
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.nav-cta::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--vermillion);
  animation: livePulse 2.4s ease-out infinite;
}
.nav-cta:hover { background: var(--flame); color: var(--navy); border-color: var(--flame); }

@keyframes livePulse {
  0%   { box-shadow: 0 0 0 0 rgba(224, 54, 44, 0.55); }
  70%  { box-shadow: 0 0 0 8px rgba(224, 54, 44, 0); }
  100% { box-shadow: 0 0 0 0 rgba(224, 54, 44, 0); }
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-line);
  background: rgba(255, 255, 255, 0.08);
  color: var(--cloud);
  font-size: 13px;
  font-weight: 700;
}
.nav-toggle-label { letter-spacing: 0.06em; }
.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--cloud);
  transition: transform 0.2s var(--ease), top 0.2s var(--ease), bottom 0.2s var(--ease);
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { bottom: 4px; transform: rotate(-45deg); }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  border-radius: 0 0 var(--radius-pill) var(--radius-pill);
  background: linear-gradient(90deg, var(--flame), var(--gold) 55%, var(--jade));
  opacity: 0.95;
  pointer-events: none;
}

/* 收拢状态 */
.site-header.is-compact .header-shell { padding: 6px 12px; }
.site-header.is-compact .brand-mark { width: 32px; height: 32px; border-radius: 11px; }
.site-header.is-compact .nav-link { padding: 7px 13px; }

/* ===========================================================
   页脚
   =========================================================== */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 112px);
  overflow: hidden;
  color: var(--cloud);
  background:
    radial-gradient(120% 90% at 10% -10%, rgba(30, 155, 255, 0.20), transparent 60%),
    radial-gradient(90% 80% at 88% 0%, rgba(255, 90, 31, 0.22), transparent 58%),
    linear-gradient(180deg, var(--navy) 0%, var(--navy-deep) 100%);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 62%;
  height: 240px;
  background: var(--flame);
  opacity: 0.10;
  clip-path: polygon(0 0, 100% 0, 56% 100%, 0 100%);
  pointer-events: none;
}
.site-footer::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 4px;
  background: linear-gradient(90deg, var(--jade), var(--gold) 40%, var(--flame) 75%, var(--sky));
  opacity: 0.85;
}

.footer-shell {
  position: relative;
  z-index: 1;
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(48px, 6vw, 82px) clamp(20px, 4vw, 40px) 30px;
}

.footer-top {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  grid-template-columns: minmax(260px, 1.6fr) repeat(3, minmax(120px, 1fr));
}

.footer-brand-name {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: -0.02em;
  max-width: none;
}
.footer-brand-text {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(247, 244, 239, 0.70);
  max-width: 36ch;
}
.footer-ornament {
  display: block;
  margin-top: 22px;
  height: 6px;
  width: min(220px, 62%);
  border-radius: 2px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(245, 197, 66, 0.75) 0 10px,
    rgba(245, 197, 66, 0) 10px 20px
  );
}

.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.20em;
  color: var(--jade);
  text-transform: uppercase;
}
.footer-links { display: grid; gap: 10px; }
.footer-link {
  display: inline-block;
  font-size: 15px;
  color: rgba(247, 244, 239, 0.84);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible { color: var(--flame); border-bottom-color: var(--flame); }

.footer-contact-block {
  margin-top: clamp(30px, 4vw, 46px);
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px dashed rgba(255, 255, 255, 0.18);
  display: grid;
  gap: 22px 34px;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}
.contact-row { display: grid; gap: 4px; }
.contact-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}
.contact-value {
  font-size: 15px;
  color: rgba(247, 244, 239, 0.92);
  overflow-wrap: anywhere;
}
.contact-note {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(247, 244, 239, 0.58);
  max-width: 62ch;
}

.footer-bottom {
  margin-top: clamp(32px, 5vw, 56px);
  padding-top: 20px;
  border-top: 1px solid var(--glass-line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  font-size: 13px;
  color: rgba(247, 244, 239, 0.62);
}
.footer-legal { font-family: var(--font-mono); letter-spacing: 0.04em; }
.footer-copyright { font-size: 13px; }

/* ===========================================================
   通用版式
   =========================================================== */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 40px);
}

.section { padding-block: clamp(48px, 7vw, 96px); position: relative; }
.section--dark {
  color: var(--cloud);
  background: linear-gradient(160deg, var(--navy) 0%, #0D2350 58%, var(--indigo) 100%);
}
.section--indigo { color: var(--cloud); background: var(--indigo); }
.section--cloud { background: var(--cloud); color: var(--graphite); }
.section--cloud h1,
.section--cloud h2,
.section--cloud h3,
.section--cloud h4 { color: var(--navy); }

.section-head {
  display: grid;
  gap: 14px;
  max-width: 74ch;
  margin-bottom: clamp(24px, 3.6vw, 46px);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}
.section--cloud .eyebrow { color: var(--flame); }

.lede {
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.8;
  opacity: 0.88;
  max-width: 62ch;
}

.display-xxl {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(64px, 9vw, 112px);
  line-height: 0.94;
  letter-spacing: -0.03em;
}

.diagonal-cut { clip-path: polygon(0 0, 100% 0, 100% 84%, 0 100%); }
.diagonal-cut--reverse { clip-path: polygon(0 7%, 100% 0, 100% 100%, 0 100%); }

.stack { display: grid; gap: clamp(14px, 2vw, 22px); }

.grid { display: grid; gap: clamp(18px, 2.4vw, 28px); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

.rule { height: 1px; border: 0; background: var(--glass-line); margin-block: clamp(24px, 4vw, 44px); }
.rule--navy { background: var(--hairline); }

.text-link {
  color: var(--sky-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 0.18s var(--ease);
}
.text-link:hover { color: var(--flame); }
.section--dark .text-link,
.section--indigo .text-link { color: var(--sky); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease),
              color 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn--flame {
  background: var(--flame);
  color: var(--navy);
  box-shadow: 0 10px 26px rgba(255, 90, 31, 0.30);
}
.btn--flame:hover { background: var(--flame-soft); }
.btn--sky { background: var(--sky-deep); color: var(--cloud); }
.btn--sky:hover { background: var(--sky); color: var(--navy); }
.btn--ghost {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--glass-line);
  color: var(--cloud);
}
.btn--ghost:hover { border-color: var(--flame); color: var(--flame); }
.btn--oncloud { background: var(--navy); color: var(--cloud); }
.btn--oncloud:hover { background: var(--indigo); }

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: rgba(247, 244, 239, 0.62);
}
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 8px; }
.breadcrumbs li { display: flex; align-items: center; gap: 8px; }
.breadcrumbs li + li::before { content: "›"; color: rgba(247, 244, 239, 0.42); }
.breadcrumbs a:hover { color: var(--flame); }
.breadcrumbs [aria-current="page"] { color: var(--gold); }
.section--cloud .breadcrumbs { color: rgba(42, 47, 58, 0.62); }
.section--cloud .breadcrumbs li + li::before { color: rgba(42, 47, 58, 0.35); }
.section--cloud .breadcrumbs [aria-current="page"] { color: var(--flame); }

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  font-size: 12.5px;
  font-weight: 700;
  line-height: 1.4;
  background: rgba(30, 155, 255, 0.16);
  border: 1px solid rgba(30, 155, 255, 0.38);
  color: var(--sky);
}
.tag--flame { background: rgba(255, 90, 31, 0.16); border-color: rgba(255, 90, 31, 0.42); color: var(--flame); }
.tag--jade { background: rgba(0, 168, 143, 0.16); border-color: rgba(0, 168, 143, 0.42); color: var(--jade); }
.tag--gold { background: rgba(245, 197, 66, 0.16); border-color: rgba(245, 197, 66, 0.42); color: var(--gold); }
.tag--onlight { background: rgba(17, 112, 196, 0.10); border-color: rgba(17, 112, 196, 0.32); color: var(--sky-deep); }

/* ---------- 卡片与面板 ---------- */
.card {
  padding: clamp(18px, 2.4vw, 28px);
  border-radius: var(--radius-card);
  background: #FFFFFF;
  color: var(--graphite);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-1);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}
.card:hover { transform: translateY(-4px); border-color: var(--flame); box-shadow: var(--shadow-2); }

.glass-card {
  padding: clamp(18px, 2.4vw, 28px);
  border-radius: var(--radius-card);
  background: linear-gradient(180deg, var(--glass-strong), var(--glass));
  border: 1px solid var(--glass-line);
  color: var(--cloud);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-1);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}
.glass-card:hover { transform: translateY(-4px); border-color: var(--flame); box-shadow: var(--shadow-2); }

.panel {
  padding: clamp(20px, 3vw, 34px);
  border-radius: var(--radius-card);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-line);
}
.section--cloud .panel { background: #FFFFFF; border-color: var(--hairline); }

/* ---------- 数字 ---------- */
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: -0.01em;
}
.num--score { font-size: clamp(40px, 7vw, 72px); font-weight: 700; line-height: 1; }
.num--stamp { font-size: 13px; color: var(--gold); }
.section--cloud .num--stamp { color: var(--sky-deep); }

/* ---------- 图片容器（基础规则，供页面阶段放置运动摄影） ---------- */
.figure { margin: 0; }

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-card);
  border: 1px solid var(--hairline);
  background: linear-gradient(140deg, var(--indigo) 0%, var(--navy) 100%);
  aspect-ratio: 16 / 10;
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.05);
  transition: transform 0.4s var(--ease);
}
.media-frame:hover img { transform: scale(1.03); }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--glass { border-color: var(--glass-line); box-shadow: var(--shadow-2); }

.figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(42, 47, 58, 0.66);
  max-width: 70ch;
}
.section--dark .figure__caption,
.section--indigo .figure__caption { color: rgba(247, 244, 239, 0.62); }

/* ---------- 时间轴 ---------- */
.timeline {
  position: relative;
  padding-left: 28px;
  border-left: 1px solid rgba(255, 255, 255, 0.20);
}
.timeline-item { position: relative; padding: 0 0 26px 8px; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -35px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--navy);
  transition: transform 0.2s var(--ease);
}
.timeline-item:hover::before { transform: scale(1.12); }
.timeline-item__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gold);
}
.timeline-item__body { margin-top: 6px; font-size: 15.5px; line-height: 1.75; }
.timeline-item__body p { max-width: 60ch; }

.section--cloud .timeline { border-left-color: var(--hairline); }
.section--cloud .timeline-item::before { border-color: var(--cloud); }
.section--cloud .timeline-item__time { color: var(--sky-deep); }

/* ---------- 显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ===========================================================
   响应式
   =========================================================== */
@media (max-width: 1080px) {
  .brand-tagline { display: none; }
  .nav-link { padding: 8px 11px; font-size: 14px; }
  .footer-top { grid-template-columns: minmax(240px, 1.4fr) repeat(3, minmax(110px, 1fr)); }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }
  .nav-cta { display: none; }

  .primary-nav {
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 12px;
    border-radius: 24px;
    border: 1px solid var(--glass-line);
    background: linear-gradient(180deg, rgba(11, 27, 58, 0.97), rgba(20, 48, 107, 0.97));
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow-2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s var(--ease);
  }
  .primary-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .nav-list { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; }
  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 13px 15px;
    border-radius: 16px;
    font-size: 15px;
    background: rgba(255, 255, 255, 0.05);
  }
  .nav-link[aria-current="page"] { background: var(--flame); color: var(--navy); }

  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .nav-list { grid-template-columns: 1fr; }
  .brand-mark { width: 34px; height: 34px; border-radius: 12px; }
  .brand-name { font-size: 17px; }
  .footer-top { grid-template-columns: 1fr; gap: 30px; }
  .footer-contact-block { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .btn { width: 100%; justify-content: center; }
}

/* ===========================================================
   可达性与动效降级
   =========================================================== */
@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; transform: none; }
  .btn:hover,
  .card:hover,
  .glass-card:hover,
  .timeline-item:hover::before,
  .media-frame:hover img { transform: none; }
  .scroll-progress { display: none; }
}