:root{--teal:#1d9e75;--teal-light:#e1f5ee;--teal-mid:#0f6e56;--teal-dark:#085041;--amber:#ba7517;--red:#a32d2d;--text:#1a1a1a;--text-muted:#6b7280;--text-hint:#9ca3af;--bg:#fff;--bg-surface:#f9fafb;--border:rgba(0,0,0,.12);--border-strong:rgba(0,0,0,.25);--radius:8px;--radius-lg:12px}@media (prefers-color-scheme:dark){:root{--text:#f3f4f6;--text-muted:#9ca3af;--text-hint:#6b7280;--bg:#0f0f0f;--bg-surface:#1a1a1a;--border:hsla(0,0%,100%,.12);--border-strong:hsla(0,0%,100%,.25);--teal-light:#0a2e22}}*{box-sizing:border-box;margin:0;padding:0}html{font-size:16px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}.container{max-width:680px;margin:0 auto;padding:2rem 1.25rem}button{cursor:pointer;font-family:inherit;font-size:14px}.btn-primary{background:var(--teal);color:#fff;border:none;border-radius:var(--radius);padding:10px 24px;font-weight:500;transition:opacity .15s}.btn-primary:hover{opacity:.88}.btn-primary:disabled{opacity:.4;cursor:not-allowed}.btn-secondary{background:transparent;color:var(--text-muted);border:.5px solid var(--border-strong);border-radius:var(--radius);padding:10px 20px}.btn-secondary:hover{background:var(--bg-surface)}.card{background:var(--bg);border:.5px solid var(--border);border-radius:var(--radius-lg);padding:1rem 1.25rem}