/* =========================================================================
   51rokid · 高级落地页样式
   设计基调：大气 / 简洁 / 高大上。深色为默认，玻璃拟态 + 极光背景。
   ========================================================================= */

/* ---------- 主题变量 ---------- */
:root {
  --bg: #0a0b10;
  --bg-soft: #11131b;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-strong: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.10);
  --border-strong: rgba(255, 255, 255, 0.18);
  --text: #f4f6fb;
  --text-dim: rgba(244, 246, 251, 0.66);
  --text-faint: rgba(244, 246, 251, 0.42);
  --accent: #5eead4;       /* 极光青 */
  --accent-2: #818cf8;     /* 靛紫 */
  --accent-3: #38bdf8;     /* 天蓝 */
  --grad: linear-gradient(120deg, #5eead4 0%, #818cf8 55%, #38bdf8 100%);
  --shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.7);
  --radius: 20px;
  --radius-sm: 12px;
  --maxw: 1140px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --bg: #f6f8fc;
  --bg-soft: #ffffff;
  --surface: rgba(15, 23, 42, 0.03);
  --surface-strong: rgba(15, 23, 42, 0.06);
  --border: rgba(15, 23, 42, 0.10);
  --border-strong: rgba(15, 23, 42, 0.18);
  --text: #0d1220;
  --text-dim: rgba(13, 18, 32, 0.66);
  --text-faint: rgba(13, 18, 32, 0.42);
  --shadow: 0 24px 60px -28px rgba(31, 41, 90, 0.35);
  /* 浅色模式下 accent 改为深青色，确保文字/边框在白底上清晰可读 */
  --accent: #0d9488;
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
}

a { color: inherit; text-decoration: none; }
strong { color: var(--text); font-weight: 600; }

/* ---------- 背景极光 ---------- */
.aurora { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.orb {
  position: absolute; border-radius: 50%;
  filter: blur(80px); opacity: 0.5;
  animation: float 18s var(--ease) infinite alternate;
}
.orb-1 { width: 46vw; height: 46vw; left: -10vw; top: -12vw; background: radial-gradient(circle, var(--accent), transparent 70%); }
.orb-2 { width: 40vw; height: 40vw; right: -8vw; top: 8vw; background: radial-gradient(circle, var(--accent-2), transparent 70%); animation-delay: -6s; }
.orb-3 { width: 38vw; height: 38vw; left: 28vw; bottom: -16vw; background: radial-gradient(circle, var(--accent-3), transparent 70%); animation-delay: -12s; }
.grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(var(--border) 1px, transparent 1px), linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 30%, transparent 75%);
  opacity: 0.4;
}
@keyframes float { to { transform: translate3d(4vw, 4vh, 0) scale(1.12); } }

/* ---------- 玻璃材质 ---------- */
.glass {
  background: var(--surface);
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 16px; z-index: 50;
  max-width: var(--maxw); margin: 16px auto 0; padding: 12px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  border-radius: 999px;
}
.brand { display: inline-flex; align-items: baseline; font-weight: 800; font-size: 20px; letter-spacing: -0.02em; flex-shrink: 0; }
.brand-mark {
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.brand-text { color: var(--text); }
.brand-url {
  margin-left: 8px; padding: 2px 8px; border-radius: 6px;
  font-size: 11px; font-weight: 500; letter-spacing: 0.02em;
  color: var(--text-faint); text-decoration: none;
  background: var(--surface); border: 1px solid var(--border);
  transition: opacity 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.brand:hover .brand-url { opacity: 1; color: var(--accent); border-color: var(--accent); }
.nav-links { display: flex; gap: 26px; }
.nav-links a { color: var(--text-dim); font-size: 15px; transition: color 0.2s var(--ease); }
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 12px; }

.theme-toggle {
  width: 40px; height: 40px; border-radius: 50%; cursor: pointer;
  display: grid; place-items: center; color: var(--text);
  background: var(--surface-strong); border: 1px solid var(--border);
  transition: transform 0.25s var(--ease), background 0.25s var(--ease);
}
.theme-toggle:hover { transform: rotate(18deg) scale(1.05); }
.theme-toggle .i-moon { display: none; }
[data-theme="light"] .theme-toggle .i-sun { display: none; }
[data-theme="light"] .theme-toggle .i-moon { display: block; }

/* ---------- 移动端汉堡菜单 ---------- */
.menu-btn {
  width: 40px; height: 40px; border-radius: 50%;
  display: none; place-items: center; cursor: pointer;
  color: var(--text);
  background: var(--surface-strong); border: 1px solid var(--border);
  font-size: 18px; line-height: 1;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease);
}
.menu-btn:hover { background: var(--surface); border-color: var(--accent); }
.menu-panel {
  display: none;
  position: fixed; top: 76px; right: 16px; left: 16px; z-index: 49;
  flex-direction: column; gap: 4px;
  padding: 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow);
}
.menu-panel.open { display: flex; }
.menu-panel a {
  display: block; padding: 12px 14px; border-radius: 8px;
  color: var(--text); font-size: 15px; font-weight: 600;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}
.menu-panel a:hover, .menu-panel a.active { background: var(--surface-strong); color: var(--accent); }
@media (max-width: 900px) {
  .menu-btn { display: grid; }
}

/* ---------- 图片 Lightbox（二维码放大长按识别） ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 999;
  display: none; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  padding: 24px;
  cursor: zoom-out;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: min(320px, 88vw);
  max-height: 88vh;
  border-radius: 16px;
  background: #fff;
  padding: 12px;
  box-shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.8);
}
.lightbox-tip {
  position: absolute; bottom: 28px; left: 0; right: 0;
  text-align: center; color: rgba(255, 255, 255, 0.72);
  font-size: 13px; pointer-events: none;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: 999px; font-size: 15px; font-weight: 600;
  cursor: pointer; border: 1px solid transparent; white-space: nowrap;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
  will-change: transform;
}
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn.block { width: 100%; }
.btn-primary {
  background: var(--grad); color: #04121a;
  box-shadow: 0 10px 30px -10px rgba(94, 234, 212, 0.5);
}
.btn-primary:hover { box-shadow: 0 16px 40px -10px rgba(129, 140, 248, 0.6); }
.btn-ghost {
  background: var(--surface-strong); color: var(--text); border-color: var(--border-strong);
}
.btn-ghost:hover { background: var(--surface); border-color: var(--accent); }

/* ---------- 通用区块 ---------- */
.section { max-width: var(--maxw); margin: 0 auto; padding: 96px 24px; scroll-margin-top: 88px; }
.section-head { max-width: 680px; margin: 0 auto 48px; text-align: center; }
.eyebrow {
  display: inline-block; font-size: 17px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent); font-weight: 700; margin-bottom: 16px;
}
/* 英雄区顶层认证标识：青色描边玻璃胶囊，单独成行、突出显示 */
.hero-eyebrow {
  text-transform: none; font-size: 18px; letter-spacing: 0.04em; font-weight: 800;
  padding: 11px 24px; border-radius: 999px; margin-bottom: 22px;
  color: var(--accent);
  background: var(--surface);
  border: 1px solid var(--accent);
  box-shadow: 0 8px 30px -12px var(--accent), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.section-head h2 { font-size: clamp(28px, 4vw, 44px); line-height: 1.15; letter-spacing: -0.02em; font-weight: 800; }
.section-sub { color: var(--text-dim); margin-top: 14px; font-size: 17px; }

/* ---------- 英雄区 ---------- */
.hero { max-width: var(--maxw); margin: 0 auto; padding: 96px 24px 64px; text-align: center; }
.hero-title {
  font-size: clamp(28px, 6vw, 76px); line-height: 1.08; letter-spacing: -0.03em; font-weight: 800;
  margin: 18px auto 0; max-width: none;
}
.grad {
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { max-width: 640px; margin: 26px auto 0; color: var(--text-dim); font-size: clamp(16px, 2vw, 19px); }
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-top: 38px; }

/* 信任数据条 */
.trust {
  margin: 72px auto 0; max-width: 900px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
  padding: 26px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
}
.trust-item { text-align: center; }
.trust-item b { display: block; font-size: clamp(22px, 3vw, 32px); font-weight: 800; letter-spacing: -0.02em; }
.trust-item span { color: var(--text-faint); font-size: 13px; }

/* ---------- 卡片（三大服务） ---------- */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.card { padding: 30px; display: flex; flex-direction: column; gap: 14px; transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease); }
.card:hover { transform: translateY(-6px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.card-icon {
  width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; font-size: 26px;
  background: var(--surface-strong); border: 1px solid var(--border);
}
.card h3 { font-size: 21px; font-weight: 700; letter-spacing: -0.01em; }
.card-desc { color: var(--text-dim); font-size: 15px; }
.card-points { list-style: none; display: flex; flex-direction: column; gap: 8px; margin: 4px 0; }
.card-points li { position: relative; padding-left: 22px; color: var(--text-dim); font-size: 14.5px; }
.card-points li::before {
  content: ""; position: absolute; left: 0; top: 9px; width: 8px; height: 8px; border-radius: 50%;
  background: var(--grad);
}
.card-price { margin-top: auto; font-size: 30px; font-weight: 800; letter-spacing: -0.02em; }
.card-price .from { font-size: 18px; font-weight: 600; color: var(--text-dim); margin-right: 2px; }
.card-price .unit { font-size: 14px; font-weight: 500; color: var(--text-faint); margin-left: 6px; }

/* ---------- 为什么是我们 ---------- */
.why-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.why { padding: 28px; transition: transform 0.35s var(--ease), border-color 0.35s var(--ease); }
.why:hover { transform: translateY(-4px); border-color: var(--border-strong); }

/* ---------- 域名矩阵 · 共建生态 ---------- */
.domain-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px;
  max-width: 920px; margin: 0 auto;
}
.domain-card {
  padding: 26px 24px; display: flex; flex-direction: column; gap: 8px;
  position: relative; overflow: hidden;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.domain-card:hover { transform: translateY(-5px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.domain-tld {
  font-size: 13px; font-weight: 700; letter-spacing: 0.05em;
  color: var(--accent); text-transform: uppercase;
}
.domain-name {
  font-size: 23px; font-weight: 800; letter-spacing: -0.01em;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.domain-role { color: var(--text-dim); font-size: 14px; }
/* 主推卡片高亮 */
.domain-card.featured {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 18px 50px -20px rgba(45,212,191,0.45);
}
.domain-card.featured::after {
  content: "主推"; position: absolute; top: 14px; right: 14px;
  font-size: 11px; font-weight: 700; color: #04181a;
  background: var(--accent); padding: 3px 10px; border-radius: 999px;
}
/* 共建 CTA */
.domain-cta {
  max-width: 920px; margin: 36px auto 0; padding: 28px 32px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  border-radius: var(--radius); background: var(--surface);
  border: 1px solid var(--border); backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
}
.domain-cta-text { display: flex; flex-direction: column; gap: 4px; text-align: left; }
.domain-cta-text b { font-size: 18px; font-weight: 800; letter-spacing: -0.01em; }
.domain-cta-text span { color: var(--text-dim); font-size: 14.5px; }

/* ---------- AR 智能眼镜 · 产品亮点（纯文字卡片） ---------- */
.highlight-section { margin-top: 20px; }
.highlight-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  max-width: var(--maxw); margin: 0 auto;
}
.highlight-card {
  padding: 30px; display: flex; flex-direction: column; gap: 12px;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease);
}
.highlight-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(13,148,136,0.12);
  border-color: var(--border-strong);
}
.h-icon {
  width: 54px; height: 54px; border-radius: 16px; display: grid; place-items: center;
  font-size: 26px; background: var(--surface-strong); border: 1px solid var(--border);
}
.highlight-card h3 { font-size: 20px; font-weight: 700; letter-spacing: -0.01em; }
.highlight-card p { color: var(--text-dim); font-size: 15px; line-height: 1.6; margin: 0; }

/* ---------- AR 智能眼镜 · 场景展示（纯文字卡片） ---------- */
.scenario-section { margin-top: 20px; }
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: var(--maxw); margin: 0 auto;
}
.scenario-card {
  padding: 26px; display: flex; flex-direction: column; gap: 10px;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
  cursor: default;
}
.scenario-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px -10px rgba(13,148,136,0.2);
  border-color: rgba(13,148,136,0.4);
}
.s-icon {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  font-size: 22px; background: var(--surface-strong); border: 1px solid var(--border);
}
.scenario-card h3 {
  font-size: 18px; font-weight: 700; color: var(--text); margin: 0;
  letter-spacing: -0.01em;
}
.scenario-card p {
  font-size: 14.5px; color: var(--text-dim); line-height: 1.55; margin: 0;
}
.scenario-cta {
  text-align: center; font-size: 19px; font-weight: 700;
  letter-spacing: 0.04em; color: var(--accent);
  margin-top: 44px; margin-bottom: 8px;
}
.why b { display: block; font-size: 19px; font-weight: 700; margin-bottom: 8px; letter-spacing: -0.01em; }
.why p { color: var(--text-dim); font-size: 15px; }

/* ---------- 二维码区（合作洽谈 / 关注，横向并排） ---------- */
.qr-grid {
  display: flex; gap: 32px; justify-content: center; align-items: flex-start; flex-wrap: wrap;
}

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--border); margin-top: 40px; }
.footer-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 32px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.footer-meta { display: flex; flex-direction: column; gap: 8px; text-align: center; align-items: center; }
.footer-links-group { display: flex; flex-direction: row; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: center; }
.footer-tag { color: var(--text-faint); font-size: 13px; }
.footer-dot { color: var(--text-faint); font-size: 12px; user-select: none; }
.icp { color: var(--text-faint); font-size: 13px; text-decoration: none; transition: color 0.2s var(--ease); }
.icp:hover { color: var(--accent); }
.footer-link { color: var(--text-dim); font-size: 14px; transition: color 0.2s var(--ease); }
.footer-link:hover { color: var(--accent); }
.qr-card {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.qr-frame {
  padding: 8px;
  border-radius: var(--radius-sm);
  background: #fff;
  border: 1px solid var(--border-strong);
  box-shadow: 0 6px 18px -8px rgba(0, 0, 0, 0.35);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}
.qr-frame:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: 0 12px 28px -10px var(--accent);
}
.qr-frame img {
  display: block;
  border-radius: 4px;
}
.qr-label { font-size: 13px; color: var(--text-dim); font-weight: 600; }
/* ---------- 联盟官方合作平台徽标 ---------- */
.alliance-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 18px; border-radius: 999px;
  font-size: 14px; font-weight: 600; letter-spacing: 0.01em;
  color: var(--accent);
  background: var(--surface); border: 1px solid var(--accent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}
/* 英雄区徽标组：认证标识与联盟标识并排一行 */
.hero-badges {
  display: flex; gap: 14px; justify-content: center; align-items: center;
  flex-wrap: wrap; margin-bottom: 22px;
}
.hero-badges .hero-eyebrow { margin-bottom: 0; }
.alliance-badge::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 10px var(--accent);
}

/* ---------- 官方站点域名强调 ---------- */
.hero-domain {
  display: inline-flex; align-items: center; gap: 8px;
  margin: 16px auto 0;
  padding: 9px 20px; border-radius: 999px;
  font-size: 15px; font-weight: 700; letter-spacing: 0.02em;
  text-decoration: none; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 8px 30px -8px var(--accent), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.hero-domain::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%;
  background: #fff; box-shadow: 0 0 10px #fff;
}
.hero-domain:hover { transform: translateY(-2px); box-shadow: 0 14px 40px -8px var(--accent), inset 0 1px 0 rgba(255, 255, 255, 0.35); }
.footer-site {
  font-size: 15px; font-weight: 700; letter-spacing: 0.02em;
  color: var(--accent); text-decoration: none;
  transition: color 0.2s var(--ease), text-shadow 0.2s var(--ease);
}
.footer-site:hover { color: var(--accent-2); text-shadow: 0 0 16px var(--accent); }

/* ---------- 滚动揭示动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .domain-grid { grid-template-columns: repeat(2, 1fr); }
  .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .highlight-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .nav-links { display: none; }
  /* 移动端 header：隐藏过长的 URL 框、收紧间距 */
  .brand-url { display: none; }
  .brand { font-size: 17px; }
  .nav-actions { gap: 8px; }
  .nav-actions .btn-primary { padding: 9px 14px; font-size: 13px; }
  .nav { padding: 10px 16px; gap: 12px; }
  .cards { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .trust { grid-template-columns: repeat(2, 1fr); }
  .contact-wrap { grid-template-columns: 1fr; padding: 32px; gap: 28px; }
  .footer-inner {
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
  }
  .domain-grid { grid-template-columns: 1fr; }
  .scenario-grid { grid-template-columns: repeat(2, 1fr); }
  .highlight-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-product img { max-width: 420px; }
  .domain-cta { flex-direction: column; align-items: stretch; text-align: center; }
  .domain-cta-text { text-align: center; align-items: center; }
  .domain-cta .btn { width: 100%; }
}
@media (max-width: 560px) {
  .section { padding: 64px 18px; }
  .hero { padding: 64px 18px 48px; }
  .lead-form { grid-template-columns: 1fr; }
  .trust { grid-template-columns: 1fr; }
  .hero-cta .btn { width: 100%; }
  .scenario-grid { grid-template-columns: 1fr; }
  .highlight-grid { grid-template-columns: 1fr; }
  .hero-product img { max-width: 100%; }
  .scenario-cta { font-size: 16px; margin-top: 32px; }
  /* 超小屏 header 进一步收紧 */
  .brand { font-size: 15px; }
  .nav-actions .btn-primary { padding: 8px 12px; font-size: 12px; }
  .theme-toggle { width: 36px; height: 36px; }
  .nav { padding: 8px 12px; gap: 8px; }
}

/* ---------- 无障碍：尊重减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
}

/* 焦点可见性 */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }