:root{color-scheme:dark;--bg: #0d1017;--card: #151a24;--border: #273044;--text: #edf1f7;--muted: #8d97ab;--accent: #6ea8fe}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,system-ui,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}header{padding:2rem 2rem 1rem;border-bottom:1px solid var(--border)}header h1{margin:0;font-size:1.6rem}header p{margin:.4rem 0 0;color:var(--muted)}main{padding:1.5rem 2rem 2rem;display:grid;gap:1.25rem;max-width:720px}.mode,.info{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:1rem 1.25rem}.mode h2,.info h2{margin:0 0 .75rem;font-size:.8rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}.buttons{display:flex;flex-wrap:wrap;gap:.5rem}button{padding:.6rem 1rem;border:1px solid var(--border);border-radius:8px;background:#1c2330;color:var(--text);cursor:pointer;font-size:.9rem}button:hover{border-color:var(--accent);background:#6ea8fe1a}pre{margin:0;padding:.75rem;background:var(--bg);border-radius:6px;font-size:.75rem;overflow-x:auto;color:#9fd89f;border:1px solid var(--border)}