:root { --bg: #fafaf8; --fg: #1d1d1f; --muted: #6e6e73; --accent: #2f6fde; --card: #fff; --line: #e5e5ea; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #111113; --fg: #f2f2f5; --muted: #a1a1a8; --accent: #6ea0ff; --card: #1c1c1f; --line: #2c2c30; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); line-height: 1.7;
  font-family: -apple-system, "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
main { max-width: 760px; margin: 0 auto; padding: 48px 16px; }
.hero { text-align: center; }
.hero img { width: 96px; height: 96px; border-radius: 22px; }
.hero h1 { font-size: 32px; margin: 16px 0 4px; }
.hero .tagline { color: var(--muted); font-size: 18px; margin: 0 0 24px; }
.download { display: inline-block; padding: 10px 22px; border-radius: 999px; background: var(--accent); color: #fff; }
.download.disabled { background: var(--line); color: var(--muted); }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin: 48px 0; }
.features div { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px; }
.features h3 { margin: 0 0 6px; font-size: 17px; }
.features p { margin: 0; color: var(--muted); font-size: 15px; }
.links { text-align: center; }
.doc h1 { font-size: 26px; }
.doc p { overflow-wrap: anywhere; }
footer { text-align: center; color: var(--muted); font-size: 13px; padding: 24px 16px 40px; border-top: 1px solid var(--line); }
footer p { margin: 4px 0; }
footer a { color: var(--muted); }
.doc hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }