:root{--bg:#0d1117;--bg-elev:#161b22;--border:#2d333b;--text:#e6edf3;--text-dim:#9aa4af;--accent:#3fb97f;--accent-dim:#2a7d57;--danger:#e5534b;--maxw:960px}*{box-sizing:border-box;margin:0;padding:0}html{color-scheme:dark}body{background:var(--bg);color:var(--text);font-family:var(--font-noto),"Hiragino Sans","Yu Gothic",sans-serif;line-height:1.8;-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}main{max-width:var(--maxw);margin:0 auto;padding:48px 20px 80px}h1{font-size:1.9rem;line-height:1.4;margin-bottom:16px}h2{font-size:1.3rem;margin:40px 0 12px;padding-bottom:8px;border-bottom:1px solid var(--border)}p,ul{margin-bottom:14px}ul{padding-left:1.4em}.card{background:var(--bg-elev);border:1px solid var(--border);border-radius:12px;padding:20px}.grid3{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));grid-gap:16px;gap:16px}.btn{display:inline-block;background:var(--accent);color:#04110b;font-weight:700;border-radius:8px;padding:10px 20px}.btn:hover{text-decoration:none;opacity:.9}.note{font-size:.85rem}.note,.tab{color:var(--text-dim)}.tab{display:inline-block;padding:10px 20px;border:1px solid var(--border);border-radius:8px}.tab:hover{text-decoration:none;color:var(--text)}