*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif; color: #1a1a1a; background: #fafafa; line-height: 1.75; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
:root {
  --primary: #2563eb;
  --primary-dark: #1e3a8a;
  --accent: #0ea5e9;
  --bg: #ffffff;
  --muted: #666;
  --border: #e5e7eb;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,0.06);
  --container: 1100px;
}
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 20px; }
.header { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,0.85); backdrop-filter: saturate(180%) blur(8px); border-bottom: 1px solid var(--border); transition: box-shadow .2s ease; }
.header.scrolled { box-shadow: 0 6px 20px rgba(0,0,0,.06); }
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; color: var(--primary-dark); letter-spacing: .02em; }
.brand-mark { width: 28px; height: 28px; border-radius: 8px; background: linear-gradient(135deg, var(--primary), var(--accent)); box-shadow: var(--shadow); }
.menu-toggle { display: none; width: 36px; height: 36px; border-radius: 10px; border: 1px solid var(--border); background: #fff; }
.menu { display: flex; gap: 18px; }
.menu a { padding: 8px 10px; border-radius: 8px; color: #1f2937; font-weight: 600; font-size: 14px; }
.menu a:hover { background: #f3f4f6; }
.hero { position: relative; overflow: hidden; background: radial-gradient(1200px 400px at 20% 0%, rgba(37,99,235,0.15), transparent), linear-gradient(180deg, #ffffff, #f8fafc); }
.hero-wrap { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; align-items: center; padding: 80px 0; }
.hero h1 { margin: 0 0 12px; font-size: clamp(28px, 4.6vw, 48px); line-height: 1.2; color: #0f172a; }
.hero p { margin: 0 0 18px; color: #334155; font-size: 16px; }
.cta { display: inline-flex; align-items: center; gap: 10px; padding: 12px 18px; background: var(--primary); color: #fff; border-radius: 12px; box-shadow: var(--shadow); font-weight: 700; }
.cta:hover { background: #1d4ed8; }
.card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.section { padding: 70px 0; }
.section-title { font-size: 26px; font-weight: 800; color: #0f172a; margin: 0 0 14px; }
.section-desc { color: var(--muted); margin: 0 0 24px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.paper { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.list { margin: 0; padding-left: 18px; }
.list li { margin-bottom: 8px; color: #374151; }
.kv { display: grid; grid-template-columns: 1fr 2fr; gap: 10px; }
.kv strong { color: #0f172a; }
.values { display: grid; grid-template-columns: repeat(4,1fr); gap: 16px; }
.value { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.value h4 { margin: 6px 0 0; font-size: 16px; color: #111827; }
.footer { border-top: 1px solid var(--border); background: #ffffff; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; padding: 22px 0; color: #6b7280; font-size: 14px; }
.reveal { opacity: 0; transform: translateY(12px); transition: opacity .4s ease, transform .4s ease; will-change: transform, opacity; }
.reveal.in-view { opacity: 1; transform: translateY(0); }
.back-to-top { position: fixed; right: 18px; bottom: 22px; width: 40px; height: 40px; border-radius: 10px; background: #111827; color: #fff; display: none; align-items: center; justify-content: center; border: none; box-shadow: var(--shadow); }
.back-to-top.show { display: inline-flex; }
@media (max-width: 960px) {
  .hero-wrap { grid-template-columns: 1fr; padding: 56px 0; }
  .grid-2 { grid-template-columns: 1fr; }
  .grid-3, .values { grid-template-columns: 1fr 1fr; }
  .menu-toggle { display: inline-block; }
  .menu { display: none; position: absolute; top: 64px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); padding: 12px 20px; }
  .menu.open { display: flex; }
}
@media (max-width: 560px) {
  .grid-3, .values { grid-template-columns: 1fr; }
}