:root {
  --bg: #0b1020;
  --bg-2: #111936;
  --card: #ffffff;
  --text: #1f2430;
  --muted: #5b6472;
  --primary: #4f7cff;
  --primary-dark: #3a63e0;
  --border: #e6e9f2;
  --footer-bg: #0b1020;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: #f7f8fc;
  line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* Nav */
.nav { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,0.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; font-size: 18px; color: var(--text); }
.nav nav a { color: var(--muted); margin-left: 22px; font-size: 15px; }

/* Hero */
.hero { background: radial-gradient(1200px 400px at 80% -10%, #2a3a7a 0%, var(--bg) 55%); color: #fff; padding: 96px 0 88px; }
.hero h1 { font-size: 44px; line-height: 1.2; margin: 0 0 18px; font-weight: 800; letter-spacing: .5px; }
.hero .sub { font-size: 18px; color: #c8d2f2; max-width: 720px; margin: 0 0 28px; }
.cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 12px 24px; border-radius: 8px; font-size: 15px; font-weight: 600; cursor: pointer; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); text-decoration: none; }
.btn-ghost { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,0.4); }
.btn-ghost:hover { background: rgba(255,255,255,0.1); text-decoration: none; }
.hint { margin-top: 16px; color: #8b97c4; font-size: 14px; }

/* Features */
.features { padding: 72px 0; }
.features h2 { font-size: 30px; text-align: center; margin: 0 0 40px; }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 26px 22px; box-shadow: 0 1px 3px rgba(16,24,40,0.04); }
.card h3 { font-size: 17px; margin: 0 0 10px; }
.card p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* Legal pages */
.legal { max-width: 820px; padding: 56px 24px 72px; }
.legal h1 { font-size: 32px; margin: 0 0 6px; }
.legal .updated { color: var(--muted); margin: 0 0 28px; font-size: 14px; }
.legal h2 { font-size: 20px; margin: 32px 0 10px; }
.legal ul { padding-left: 20px; }
.legal p, .legal li { color: #364050; }

/* Footer */
.footer { background: var(--footer-bg); color: #c8d2f2; padding: 40px 0; margin-top: 0; }
.footer-inner { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.footer-main p { margin: 2px 0; font-size: 14px; }
.footer-main .brand { font-weight: 700; color: #fff; margin-bottom: 8px; }
.footer-main a { color: #aab6e6; }
.footer-links { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; font-size: 14px; }
.footer-links a { color: #c8d2f2; }

@media (max-width: 860px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 32px; }
  .footer-inner { flex-direction: column; }
  .footer-links { align-items: flex-start; }
}