:root {
  --bg: #f4f7fa;
  --surface: #ffffff;
  --text: #243447;
  --muted: #657789;
  --line: #dbe5ee;
  --accent: #2f72ad;
  --accent-soft: #e7f0f8;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.75 system-ui, -apple-system, "Microsoft YaHei", sans-serif; }
a { color: inherit; }
.container { width: min(100% - 32px, 960px); margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.94); border-bottom: 1px solid var(--line); backdrop-filter: blur(10px); }
.nav { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { color: var(--accent); font-weight: 700; text-decoration: none; }
.nav-links { display: flex; flex-wrap: wrap; gap: 6px; }
.nav-links a { padding: 6px 12px; border-radius: 6px; text-decoration: none; color: var(--muted); }
.nav-links a:hover, .nav-links a.active { background: var(--accent-soft); color: var(--accent); }
.hero { padding: 88px 0 64px; max-width: 720px; }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: 12px; font-weight: 700; letter-spacing: .12em; }
h1, h2 { line-height: 1.25; }
h1 { margin: 0 0 20px; font-size: clamp(2.2rem, 6vw, 4rem); letter-spacing: -.02em; }
h2 { margin: 0 0 12px; font-size: 1.35rem; }
.lead { max-width: 640px; margin: 0; color: var(--muted); font-size: 1.15rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button { display: inline-block; padding: 9px 16px; border-radius: 7px; background: var(--accent); color: #fff; text-decoration: none; }
.button.secondary { background: var(--accent-soft); color: var(--accent); }
.section-grid, .cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.panel { margin-bottom: 18px; padding: 28px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 8px 24px rgba(47,114,173,.06); }
.panel:hover { border-color: #b8d0e4; box-shadow: 0 12px 30px rgba(47,114,173,.1); transform: translateY(-2px); transition: .2s ease; }
.panel p { margin: 0; color: var(--muted); }
.page-main { padding: 64px 0; min-height: 70vh; }
.page-main > h1 { font-size: 2.5rem; }
.tag { display: inline-block; margin-top: 18px; padding: 2px 9px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: .85rem; }
.text-link { color: var(--accent); }
.site-footer { margin-top: 48px; padding: 24px 0; border-top: 1px solid var(--line); background: var(--surface); color: var(--muted); font-size: .9rem; }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 20px; text-align: center; }
.footer-inner a { color: var(--accent); }
@media (max-width: 640px) {
  .nav { align-items: flex-start; flex-direction: column; padding: 12px 0; }
  .hero { padding: 56px 0 42px; }
  .section-grid, .cards { grid-template-columns: 1fr; gap: 0; }
  .panel { padding: 22px; }
}