:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; margin: 0; background: #0d1117; color: #e6edf3; }
header { display: flex; justify-content: space-between; align-items: center; padding: 1.2rem 2rem; border-bottom: 1px solid #21262d; }
h1 { margin: 0; font-size: 1.3rem; }
nav a { color: #58a6ff; margin-left: 1rem; text-decoration: none; }
main { max-width: 880px; margin: 0 auto; padding: 2rem 1.5rem; }
.hero h2 { font-size: 2rem; }
.hero p { font-size: 1.05rem; color: #8b949e; }
.cta { display: inline-block; background: #238636; color: #fff; padding: .7rem 1.4rem; border-radius: 8px; text-decoration: none; }
.features, .pricing .cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.card { background: #161b22; border: 1px solid #21262d; border-radius: 10px; padding: 1.2rem; }
.card.featured { border-color: #238636; }
.price { font-size: 1.6rem; font-weight: 700; }
.muted { color: #8b949e; font-size: .85rem; }
footer { border-top: 1px solid #21262d; padding: 1.5rem 2rem; color: #8b949e; }
a { color: #58a6ff; }