:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #182033;
  --muted: #657188;
  --line: #e5eaf3;
  --brand: #1769ff;
  --brand-dark: #0c48bf;
  --soft: #edf4ff;
  --code-bg: #101827;
  --radius: 22px;
  --shadow: 0 18px 48px rgba(23, 50, 92, .10);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top left, #dceaff 0, transparent 34%), var(--bg);
  line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.topbar {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(16px);
  background: rgba(245, 247, 251, .78);
  border-bottom: 1px solid rgba(229, 234, 243, .8);
}
.nav { height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.02em; }
.logo-mark { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 14px; color: #fff; background: linear-gradient(135deg, #1769ff, #00b8d9); box-shadow: 0 12px 24px rgba(23,105,255,.22); }
.nav-links { display: flex; gap: 18px; color: var(--muted); font-size: 14px; }
.nav-links a:hover { color: var(--brand); }
.hero { padding: 72px 0 42px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 36px; align-items: center; }
.eyebrow { color: var(--brand); font-weight: 700; margin: 0 0 10px; }
h1 { font-size: clamp(34px, 5vw, 64px); line-height: 1.08; letter-spacing: -.05em; margin: 0 0 18px; }
.hero p { color: var(--muted); font-size: 18px; margin: 0 0 26px; max-width: 720px; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px; border-radius: 999px; font-weight: 700; border: 1px solid var(--line); background: var(--card); box-shadow: 0 10px 24px rgba(23,50,92,.06); }
.btn.primary { background: var(--brand); color: #fff; border-color: var(--brand); }
.hero-card { background: rgba(255,255,255,.78); border: 1px solid rgba(255,255,255,.88); border-radius: 30px; padding: 24px; box-shadow: var(--shadow); }
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.stat { padding: 18px; border-radius: 20px; background: #fff; border: 1px solid var(--line); }
.stat strong { display: block; font-size: 28px; line-height: 1; }
.stat span { color: var(--muted); font-size: 14px; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 18px; margin: 24px 0 18px; }
.section-head h2 { font-size: 28px; margin: 0; letter-spacing: -.03em; }
.search-box { display: flex; align-items: center; gap: 8px; background: #fff; border: 1px solid var(--line); border-radius: 999px; padding: 0 14px; height: 44px; min-width: 280px; }
.search-box input { border: 0; outline: 0; flex: 1; font-size: 14px; background: transparent; }
.chips { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 22px; }
.chip { border: 1px solid var(--line); background: #fff; color: var(--muted); border-radius: 999px; padding: 7px 13px; cursor: pointer; font-weight: 700; }
.chip.active { color: #fff; background: var(--brand); border-color: var(--brand); }
.article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; padding-bottom: 64px; }
.card { background: rgba(255,255,255,.9); border: 1px solid rgba(229,234,243,.96); border-radius: var(--radius); padding: 22px; box-shadow: 0 12px 32px rgba(23,50,92,.06); transition: transform .2s, box-shadow .2s, border-color .2s; display: flex; flex-direction: column; min-height: 268px; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(23,105,255,.35); }
.card-meta { display: flex; justify-content: space-between; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; margin-bottom: 12px; }
.badge { color: var(--brand); background: var(--soft); padding: 4px 9px; border-radius: 999px; font-weight: 800; }
.card h3 { font-size: 20px; line-height: 1.35; margin: 0 0 10px; letter-spacing: -.02em; }
.card p { color: var(--muted); margin: 0 0 14px; font-size: 14px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.tag { color: #526075; background: #f2f5fa; border-radius: 999px; padding: 4px 8px; font-size: 12px; }
.article-hero { padding: 54px 0 24px; }
.breadcrumb { color: var(--muted); font-size: 14px; margin-bottom: 18px; }
.article-wrap { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 28px; align-items: start; padding-bottom: 70px; }
.article-main { background: rgba(255,255,255,.94); border: 1px solid var(--line); border-radius: 28px; padding: clamp(22px, 4vw, 46px); box-shadow: var(--shadow); }
.article-main h1 { font-size: clamp(30px, 4vw, 48px); margin-bottom: 14px; }
.article-summary { color: var(--muted); font-size: 18px; margin: 0 0 22px; }
.article-info { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; color: var(--muted); font-size: 14px; }
.article-content h2 { margin-top: 34px; font-size: 24px; line-height: 1.35; letter-spacing: -.02em; }
.article-content p { margin: 14px 0; }
.article-content ul { padding-left: 22px; }
.article-content li { margin: 8px 0; }
.article-content code:not(pre code) { background: #f1f5fb; color: #0c48bf; padding: 2px 6px; border-radius: 7px; font-size: .92em; }
pre { overflow: auto; background: var(--code-bg); color: #e6edf7; border-radius: 18px; padding: 18px; line-height: 1.58; }
pre code { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace; font-size: 13px; }
.callout { border-left: 4px solid var(--brand); background: var(--soft); padding: 14px 16px; border-radius: 14px; margin: 20px 0; color: #244064; }
.sidebar { position: sticky; top: 88px; display: grid; gap: 14px; }
.side-card { background: rgba(255,255,255,.92); border: 1px solid var(--line); border-radius: 22px; padding: 18px; box-shadow: 0 10px 26px rgba(23,50,92,.06); }
.side-card h3 { margin: 0 0 12px; font-size: 16px; }
.side-card a { display: block; color: var(--muted); font-size: 14px; padding: 7px 0; }
.side-card a:hover { color: var(--brand); }
.sources a { word-break: break-all; }
.prev-next { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 34px; }
.pn { border: 1px solid var(--line); border-radius: 18px; padding: 14px; background: #fff; }
.pn small { display: block; color: var(--muted); }
.footer { border-top: 1px solid var(--line); padding: 28px 0; color: var(--muted); font-size: 14px; }
.empty { display: none; padding: 26px; border: 1px dashed var(--line); border-radius: 20px; color: var(--muted); background: #fff; }
@media (max-width: 900px) {
  .hero-grid, .article-wrap { grid-template-columns: 1fr; }
  .article-grid { grid-template-columns: repeat(2, 1fr); }
  .sidebar { position: static; }
}
@media (max-width: 640px) {
  .container { width: min(100% - 22px, 1120px); }
  .nav { height: 62px; }
  .nav-links { display: none; }
  .hero { padding: 48px 0 28px; }
  .hero p { font-size: 16px; }
  .section-head { display: block; }
  .search-box { margin-top: 14px; min-width: 0; width: 100%; }
  .article-grid { grid-template-columns: 1fr; }
  .card { min-height: 0; }
  .stat-grid, .prev-next { grid-template-columns: 1fr; }
  .article-main { border-radius: 22px; }
  pre { margin-left: -4px; margin-right: -4px; }
}