:root{color-scheme:light;--bg:#f4f6f8;--card:#ffffff;--text:#1a1f2c;--muted:#5c6578;--accent:#0b5fff;--border:#d8dee9;font-family:Segoe UI,system-ui,-apple-system,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}a{color:var(--accent)}.container{max-width:720px;margin:0 auto;padding:2rem 1rem}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1.5rem;box-shadow:0 8px 24px rgba(16,24,40,.06)}.stack{display:flex;flex-direction:column;gap:.75rem}label{font-size:.9rem;color:var(--muted)}input{width:100%;padding:.65rem .75rem;border-radius:8px;border:1px solid var(--border);font-size:1rem}button{border:none;border-radius:8px;padding:.7rem 1rem;background:var(--accent);color:white;font-weight:600;cursor:pointer}button.secondary{background:transparent;color:var(--accent);border:1px solid var(--border)}.error{color:#b42318}.error,.muted{font-size:.9rem}.muted{color:var(--muted)}