:root{color-scheme:light;--bg:#f6f8fb;--card:#fff;--text:#1f2937;--muted:#64748b;--accent:#0ea5e9;--danger:#dc2626;--ok:#15803d}*{box-sizing:border-box}body{margin:0;font-family:ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--text);background:linear-gradient(180deg,#eff6ff 0,var(--bg) 45%,#f8fafc 100%)}main{min-height:100vh;display:grid;place-items:center}.card,main{padding:24px}.card{width:100%;max-width:680px;background:var(--card);border-radius:16px;box-shadow:0 12px 40px rgba(15,23,42,.1)}h1{margin:0 0 8px}p{margin:0 0 12px;line-height:1.5}.row{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}a.link,button,input{border-radius:10px;border:1px solid #cbd5e1;padding:10px 12px;font-size:14px}button{cursor:pointer;background:#f8fafc}button.primary{background:var(--accent);color:#fff;border-color:var(--accent)}button:disabled{opacity:.6;cursor:not-allowed}a.link{text-decoration:none;color:inherit;display:inline-flex;align-items:center}.muted{color:var(--muted);font-size:13px}.error{color:var(--danger)}.error,.ok{font-weight:600}.ok{color:var(--ok)}.codebox{width:100%;margin-top:10px}