:root { --bg:#ffffff; --fg:#1d2733; --muted:#5b6b7b; --accent:#14b8a6; --card:#f3f8f7; --line:#d9e6e3; }
@media (prefers-color-scheme: dark) { :root { --bg:#10181c; --fg:#e8f0f0; --muted:#9fb3b3; --card:#17242a; --line:#26373d; } }
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--fg); font:16px/1.75 -apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",system-ui,sans-serif; }
header, main, footer { max-width: 760px; margin: 0 auto; padding: 16px 20px; }
header { display:flex; align-items:center; justify-content:space-between; gap:12px; flex-wrap:wrap; }
header a.brand { display:flex; align-items:center; gap:10px; color:var(--fg); text-decoration:none; font-weight:600; font-size:20px; }
header img { width:40px; height:40px; border-radius:9px; }
nav a { margin-left:14px; color:var(--muted); text-decoration:none; font-size:14px; }
nav a:hover { color:var(--accent); }
h1 { font-size:28px; line-height:1.35; margin:28px 0 8px; } h2 { font-size:20px; margin:32px 0 6px; } h3 { font-size:16px; margin:20px 0 4px; }
p, li { color:var(--fg); } .muted { color:var(--muted); font-size:14px; }
.hero { text-align:center; padding:24px 0 8px; } .hero img { width:120px; height:120px; border-radius:27px; box-shadow:0 6px 24px rgba(20,184,166,.25); }
.hero .tag { color:var(--muted); font-size:18px; }
.cards { display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:14px; margin:20px 0; }
.card { background:var(--card); border:1px solid var(--line); border-radius:14px; padding:14px 16px; } .card h3 { margin-top:0; }
footer { color:var(--muted); font-size:13px; border-top:1px solid var(--line); margin-top:40px; }
footer a { color:var(--muted); margin-right:14px; }
a { color:var(--accent); } table { border-collapse:collapse; width:100%; font-size:14px; } td, th { border:1px solid var(--line); padding:6px 10px; text-align:left; vertical-align:top; }