:root{color-scheme:light dark;--bg: #f6f7f9;--card: #ffffff;--text: #16181d;--muted: #6b7280;--accent: #2563eb;--danger: #dc2626;--ok: #059669;--border: #e5e7eb}@media(prefers-color-scheme:dark){:root{--bg: #0f1115;--card: #171a21;--text: #e8eaf0;--muted: #9aa1ad;--accent: #5b8cff;--danger: #f87171;--ok: #34d399;--border: #262b36}}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif;background:var(--bg);color:var(--text)}main{max-width:640px;margin:0 auto;padding:2rem 1rem 4rem}header{text-align:center;margin-bottom:1.5rem}h1{font-size:1.6rem;margin:0 0 .25rem}.logo{color:var(--accent)}.tagline{color:var(--muted);margin:0 0 1rem}nav{display:inline-flex;gap:.25rem;background:var(--card);border:1px solid var(--border);border-radius:999px;padding:.25rem}.tab{border:none;background:transparent;color:var(--muted);padding:.4rem 1.2rem;border-radius:999px;cursor:pointer;font-size:.95rem}.tab.active{background:var(--accent);color:#fff}.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1.5rem;display:flex;flex-direction:column;gap:.9rem}.card h2{margin:0;font-size:1.15rem}textarea,input[type=text]{width:100%;font-family:ui-monospace,Cascadia Code,monospace;font-size:16px;padding:.7rem;border:1px solid var(--border);border-radius:8px;background:var(--bg);color:var(--text);resize:vertical}select{padding:.25rem;border-radius:6px}button{padding:.55rem 1rem;border-radius:8px;border:1px solid var(--border);background:var(--card);color:var(--text);cursor:pointer;font-size:.95rem}button:hover:not(:disabled){border-color:var(--accent)}button:disabled{opacity:.55;cursor:default}button.primary{background:var(--accent);border-color:var(--accent);color:#fff}button.danger-outline{color:var(--danger);border-color:var(--danger);background:transparent}.row{display:flex;justify-content:space-between;align-items:center;gap:.75rem;flex-wrap:wrap}.muted{color:var(--muted);font-size:.9rem}.danger{color:var(--danger)}.code-display{display:flex;align-items:center;justify-content:space-between;gap:.75rem;background:var(--bg);border:1px dashed var(--border);border-radius:8px;padding:.7rem}.code-display code{font-size:1rem;word-break:break-all}.code-display code.small{font-size:.8rem}.code-display button{flex-shrink:0}.status{border-radius:8px;padding:.7rem;font-size:.92rem;background:var(--bg)}.status-delivered{color:var(--ok)}.status-transferring,.status-peer-online{color:var(--accent)}.secret{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:.8rem;font-size:.85rem;white-space:pre-wrap;word-break:break-all;max-height:40vh;overflow:auto}.checkbox-row{display:flex;gap:.5rem;align-items:flex-start;line-height:1.4}.checkbox-row input{margin-top:.2rem;flex-shrink:0}.qr{display:flex;flex-direction:column;align-items:center;gap:.4rem}.qr img{width:180px;height:180px;border-radius:8px;border:1px solid var(--border);background:#fff;padding:6px}.faq details{border:1px solid var(--border);border-radius:8px;padding:.7rem .9rem}.faq summary{cursor:pointer;font-weight:600}.faq p{margin:.6rem 0 0;color:var(--muted);line-height:1.55}.faq a{color:var(--accent)}footer{margin-top:1.5rem;text-align:center}.footer-links a{color:var(--accent);text-decoration:none}@media(pointer:coarse){button{min-height:44px;padding:.65rem 1.1rem}.tab{padding:.6rem 1.4rem}select{min-height:40px;font-size:16px}}