:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --surface: #ffffff;
  --text: #10182a;
  --text-muted: #5a6478;
  --line: #e6e8ec;
  --primary: #1a2233;
  --primary-soft: #41506b;
  --accent: #2f5bd0;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --container: 1080px;
  --transition: 200ms ease;
  --font: system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* 双语显示控制:只显示当前语言 */
[data-lang="zh"] [data-when-lang="en"],
[data-lang="en"] [data-when-lang="zh"] { display: none; }

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary); }

.site-shell {
  width: min(calc(100% - 40px), var(--container));
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 顶栏 */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); }
.brand-mark {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  background: var(--primary); color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 700;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.3; }
.brand-text strong { font-size: 15px; }
.brand-text small { color: var(--text-muted); font-size: 11px; letter-spacing: .5px; }
.nav { display: flex; align-items: center; gap: 20px; }
.nav a { color: var(--primary-soft); font-size: 14px; }
.lang-toggle {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--primary);
  font: inherit;
  font-size: 13px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.lang-toggle:hover { border-color: var(--primary); background: var(--bg-soft); }

main { flex: 1; }

/* 通用排版 */
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 12px;
  color: var(--text-muted);
  margin: 0 0 10px;
}
h1 { font-size: clamp(28px, 4vw, 40px); line-height: 1.25; margin: 0 0 16px; letter-spacing: -.5px; }
h2 { font-size: 22px; margin: 0 0 12px; }
h3 { font-size: 17px; margin: 0 0 8px; }
.lead { font-size: 18px; color: var(--text); }

/* Hero(首页/各页头部) */
.hero {
  padding: 64px 0 40px;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: start;
}
.hero-card {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
}
.card-label { text-transform: uppercase; letter-spacing: 1.5px; font-size: 11px; color: var(--text-muted); margin: 0 0 14px; }
.hero-actions { display: flex; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
.button {
  display: inline-block;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  border: 1px solid var(--primary);
  transition: background var(--transition), color var(--transition);
}
.button-primary { background: var(--primary); color: #fff; }
.button-primary:hover { background: #0c1322; color: #fff; }
.button-secondary { background: transparent; color: var(--primary); }
.button-secondary:hover { background: var(--bg-soft); }

/* 联系信息列表 */
.contact-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 16px; }
.contact-list li { display: flex; flex-direction: column; gap: 2px; }
.contact-list span { font-size: 12px; color: var(--text-muted); }
.contact-list strong { font-size: 15px; font-weight: 600; word-break: break-word; }

/* 区块 */
.section { padding: 36px 0; border-top: 1px solid var(--line); }
.section-heading { margin-bottom: 24px; }
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
}

/* 卡片网格 */
.grid.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px;
}
.card p { color: var(--text-muted); margin: 0; }

/* 法律页面 */
.legal-hero { padding: 56px 0 28px; border-bottom: 1px solid var(--line); }
.legal-content { padding: 28px 0; max-width: 760px; }
.legal-content section { margin-bottom: 26px; }
.legal-content p { color: var(--text-muted); }
.bullet-list { padding-left: 20px; color: var(--text-muted); }
.bullet-list li { margin-bottom: 6px; }
.legal-updated { font-size: 13px; color: var(--text-muted); }

/* 页脚 */
.footer {
  margin-top: 48px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-info strong { color: var(--text); font-size: 14px; }
.footer-info p { margin: 6px 0 0; }
.footer-meta { text-align: right; }
.footer-meta p { margin: 0 0 4px; }
.footer-icp:empty { display: none; }
.footer-icp a { color: inherit; text-decoration: none; }
.footer-icp a:hover { text-decoration: underline; }

/* 滚动入场动画 */
[data-reveal] { opacity: 0; transform: translateY(16px); transition: opacity 500ms ease, transform 500ms ease; }
[data-reveal].is-visible { opacity: 1; transform: none; }

/* 响应式 */
@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; padding-top: 40px; }
  .topbar { flex-direction: column; align-items: flex-start; gap: 14px; }
  .nav { flex-wrap: wrap; gap: 14px; }
  .footer { flex-direction: column; }
  .footer-meta { text-align: left; }
}