:root{--bg:#fff;--fg:#0b0b0c;--muted:#5b5e66;--card:#f6f7f9;--border:#e6e7ea;--r:22px}*{box-sizing:border-box}html,body{height:100%}body{margin:0;background:var(--bg);color:var(--fg);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}a{color:inherit}code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace}header.nav{position:sticky;top:0;background:rgba(255,255,255,.9);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--border)}header.nav{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 18px}header.nav .brand{font-weight:800;letter-spacing:-.02em;text-decoration:none}header.nav nav{display:flex;gap:10px;flex-wrap:wrap}header.nav nav a{padding:8px 10px;border-radius:12px;border:1px solid transparent;text-decoration:none}header.nav nav a:hover{border-color:var(--border);background:#fff}.wrap{max-width:1120px;margin:0 auto;padding:26px 18px 90px}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:22px}input,button,select,textarea{font:inherit}button{cursor:pointer}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 14px;border-radius:14px;border:1px solid var(--border);background:#fff;font-weight:800} .btn.primary{background:var(--fg);border-color:var(--fg);color:#fff} .btn:hover{transform:translateY(-1px)}