:root{--bg: #0b0f19;--surface: #131a2a;--surface-2: #1b2436;--border: #263149;--text: #e8eefc;--dim: #9bacd0;--faint: #6b7a99;--primary: #4fd6ff;--good: #3ddc84;--bad: #ff6b6b;color-scheme:dark}*{box-sizing:border-box}body{margin:0;min-height:100dvh;display:grid;place-items:start center;padding:24px 16px 64px;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Noto Sans SC,sans-serif;line-height:1.6}.card{width:100%;max-width:520px;padding:24px;border-radius:16px;background:var(--surface);border:1px solid var(--border)}h1{margin:0 0 8px;font-size:22px}.lead{margin:0 0 16px;font-size:13.5px;color:var(--dim)}.steps{margin:0 0 20px;padding-left:20px;font-size:13px;color:var(--dim)}.steps li{margin:4px 0}.field{display:block;margin-bottom:16px}.field>span{display:block;margin-bottom:6px;font-size:13px;color:var(--dim)}.field>small{display:block;margin-top:6px;font-size:12px;color:var(--faint)}input{width:100%;padding:12px 14px;border-radius:10px;border:1px solid var(--border);background:var(--surface-2);color:var(--text);font-size:16px;font-variant-numeric:tabular-nums}input:focus{outline:2px solid var(--primary);outline-offset:1px}#code,#pin{letter-spacing:.2em;font-size:20px}.segmented{display:flex;gap:8px}.segmented button{flex:1;padding:10px 8px;border-radius:10px;border:1px solid var(--border);background:var(--surface-2);color:var(--dim);font-size:13px;cursor:pointer}.segmented button.on{border-color:var(--primary);color:var(--primary);background:#4fd6ff1a}button#submit{width:100%;padding:14px;margin-top:4px;border:none;border-radius:12px;background:var(--primary);color:#07121b;font-size:16px;font-weight:600;cursor:pointer}button#submit:disabled{opacity:.6;cursor:default}.feedback{margin:14px 0 0;padding:12px 14px;border-radius:10px;font-size:13.5px}.feedback.ok{background:#3ddc841f;color:var(--good)}.feedback.error{background:#ff6b6b1f;color:var(--bad)}