:root { --bg: #f5f6f8; --card: #fff; --text: #1f2329; --muted: #6b7280; --accent: #07c160; }
@media (prefers-color-scheme: dark) { :root { --bg: #111; --card: #1c1c1e; --text: #f2f2f2; --muted: #9ca3af; } }
* { box-sizing: border-box; }
body { margin: 0; padding: 24px 16px; background: var(--bg); color: var(--text); font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; }
.card { max-width: 420px; margin: 0 auto; background: var(--card); border-radius: 16px; padding: 24px; box-shadow: 0 4px 20px rgba(0,0,0,.06); }
.center { text-align: center; }
.cover { font-size: 64px; text-align: center; margin-bottom: 8px; }
h1 { font-size: 20px; margin: 8px 0; }
.desc { color: var(--muted); font-size: 14px; line-height: 1.7; }
.feat { padding-left: 0; list-style: none; font-size: 14px; line-height: 2; }
.price { color: #fa5151; font-size: 18px; margin: 12px 0; }
.price b { font-size: 32px; }
button, .btn { display: block; width: 100%; padding: 14px; border: 0; border-radius: 10px; background: var(--accent); color: #fff; font-size: 16px; text-align: center; text-decoration: none; margin-top: 16px; cursor: pointer; }
#qr { display: inline-block; padding: 12px; background: #fff; border-radius: 8px; }