/* VAULTS — 配色与产品一致：深海军蓝 #0a0e17 / 钴蓝 #3b82f6 / 翡翠 #10b981 */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root { --bg:#0a0e17; --card:#111827; --line:#1e293b; --primary:#3b82f6; --accent:#10b981; --text:#e2e8f0; --muted:#64748b; }
html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--text); font-family: Inter, system-ui, -apple-system, 'Noto Sans', sans-serif; line-height: 1.6; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
a { color: inherit; text-decoration: none; }

.nav { position: sticky; top: 0; z-index: 50; background: rgba(10,14,23,.85); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .12em; font-size: 18px; }
.brand-mark { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 9px; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; font-size: 16px; }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 14px; }
.nav-links a:hover { color: var(--primary); }
.lang-toggle button { background: none; border: 1px solid var(--line); color: var(--muted); border-radius: 6px; padding: 3px 8px; cursor: pointer; font-size: 12px; }
.lang-toggle button.active { color: var(--primary); border-color: var(--primary); }

.hero { padding: 96px 0 72px; text-align: center; }
.badge { display: inline-block; font-size: 12px; color: var(--accent); border: 1px solid rgba(16,185,129,.4); background: rgba(16,185,129,.08); border-radius: 999px; padding: 5px 14px; margin-bottom: 22px; }
h1 { font-size: clamp(34px, 5.5vw, 56px); line-height: 1.15; font-weight: 800; letter-spacing: -0.02em; }
.grad { background: linear-gradient(90deg, var(--primary), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.sub { max-width: 720px; margin: 20px auto 32px; color: var(--muted); font-size: 17px; }
.cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn { padding: 13px 30px; border-radius: 10px; font-weight: 600; font-size: 15px; transition: .2s; }
.btn.primary { background: var(--primary); color: #fff; }
.btn.primary:hover { background: #2563eb; transform: translateY(-1px); }
.btn.ghost { border: 1px solid var(--line); color: var(--text); }
.btn.ghost:hover { border-color: var(--primary); color: var(--primary); }

.stats { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #0c1220; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; padding: 34px 24px; text-align: center; }
.stats-grid b { display: block; font-size: 30px; color: var(--accent); letter-spacing: -0.02em; }
.stats-grid span { font-size: 13px; color: var(--muted); }

.section { padding: 88px 0; }
.section.alt { background: #0c1220; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2 { font-size: 32px; font-weight: 800; text-align: center; margin-bottom: 10px; letter-spacing: -0.02em; }
.sec-sub { text-align: center; color: var(--muted); margin-bottom: 48px; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.card, .feat { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 28px; transition: .2s; }
.card:hover { border-color: var(--primary); transform: translateY(-3px); }
.card .icon { font-size: 30px; margin-bottom: 12px; }
.card h3 { margin-bottom: 10px; font-size: 18px; }
.card p, .feat p { color: var(--muted); font-size: 14px; }
.link { display: inline-block; margin-top: 14px; color: var(--primary); font-size: 14px; font-weight: 600; }
.feat h4 { margin-bottom: 8px; font-size: 16px; }

.arch-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.arch-card { border: 1px dashed var(--line); border-radius: 12px; padding: 18px 22px; font-size: 14px; color: var(--text); background: rgba(59,130,246,.04); }
.arch-card::before { content: "▸ "; color: var(--primary); }

.footer { border-top: 1px solid var(--line); padding: 40px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 18px; }
.foot-links { display: flex; gap: 20px; font-size: 14px; }
.foot-links a:hover { color: var(--primary); }
.muted { color: var(--muted); font-size: 13px; }

@media (max-width: 820px) {
  .grid3, .grid2, .arch-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links a { display: none; }
}