:root {
  --bg: #0d1117;
  --surface: #161b24;
  --text: #f2f4f8;
  --muted: #9aa4b6;
  --accent: #5c98f5;
  --hairline: rgba(255, 255, 255, 0.1);
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --surface: #f2f5fa;
    --text: #1c1c1e;
    --muted: #6b7280;
    --accent: #2e73db;
    --hairline: rgba(0, 0, 0, 0.1);
  }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  padding: 0;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 40px 22px 72px; }
header.hero { text-align: center; padding: 64px 22px 40px; }
.logo {
  width: 88px; height: 88px; border-radius: 20px; margin: 0 auto 20px;
  background: url(icon.png) center / cover;
  box-shadow: 0 12px 40px rgba(46, 115, 219, .30);
}
h1 { font-size: 2rem; letter-spacing: -0.02em; }
.tag { color: var(--muted); margin-top: 10px; font-size: 1.05rem; }
.cta {
  display: inline-block; margin-top: 26px; padding: 13px 26px; border-radius: 999px;
  background: var(--accent); color: #fff; text-decoration: none; font-weight: 600;
}
.cta.soon { background: var(--surface); color: var(--muted); border: 1px solid var(--hairline); }
.features { display: grid; gap: 14px; margin: 36px 0; }
.feature { background: var(--surface); border: 1px solid var(--hairline); border-radius: 16px; padding: 18px 20px; }
.feature h3 { font-size: 1.05rem; margin-bottom: 4px; }
.feature p { color: var(--muted); font-size: 0.95rem; }
h2 { font-size: 1.4rem; margin: 32px 0 8px; letter-spacing: -0.01em; }
.legal h2 { font-size: 1.1rem; margin: 26px 0 6px; }
.legal p { color: var(--text); margin-bottom: 4px; }
.updated { color: var(--muted); font-size: 0.9rem; margin-bottom: 20px; }
a { color: var(--accent); }
footer { text-align: center; color: var(--muted); font-size: 0.9rem; padding: 30px 22px 50px; border-top: 1px solid var(--hairline); }
footer a { margin: 0 8px; }
.back { display: inline-block; margin-bottom: 24px; color: var(--muted); text-decoration: none; font-size: 0.95rem; }