:root{--bg: #0e1116;--bg-soft: #161b23;--bg-card: #1b222c;--border: #2a323e;--text: #eef2f7;--text-dim: #9aa6b6;--text-faint: #6b7788;--accent: #4f8cff;--accent-soft: #1e2c46;--ok: #3ecf8e;--warn: #f5a623;--danger: #ff5c6c;--radius: 16px;--radius-sm: 10px;--shadow: 0 12px 40px rgba(0, 0, 0, .35);--font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif}@media(prefers-color-scheme:light){:root{--bg: #f4f6fa;--bg-soft: #ffffff;--bg-card: #ffffff;--border: #e2e7ef;--text: #101720;--text-dim: #56626f;--text-faint: #8a95a3;--accent-soft: #e8f0ff;--shadow: 0 12px 40px rgba(30, 50, 90, .1)}}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:var(--font);background:radial-gradient(1200px 600px at 50% -10%,var(--accent-soft),transparent 60%),var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}.app{min-height:100%;display:flex;flex-direction:column;max-width:560px;margin:0 auto;padding:0 20px;padding-top:env(safe-area-inset-top)}.topbar{display:flex;align-items:center;justify-content:space-between;padding:18px 0 8px}.brand{background:none;border:none;cursor:pointer;padding:0;color:var(--text)}.logo{display:inline-flex;align-items:center;gap:9px;color:var(--accent)}.logo-text{font-size:19px;font-weight:600;letter-spacing:-.02em;color:var(--text)}.logo-text b{font-weight:800;color:var(--accent)}.lang-select{display:inline-flex;align-items:center;gap:6px;color:var(--text-dim);background:var(--bg-soft);border:1px solid var(--border);border-radius:999px;padding:6px 10px 6px 12px}.lang-select select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:none;border:none;color:var(--text);font-family:var(--font);font-size:13px;font-weight:500;cursor:pointer;outline:none}.lang-select select option{color:#101720}.stage{flex:1;display:flex;flex-direction:column;justify-content:center;padding:12px 0 24px}.home{text-align:center;animation:rise .5s 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6px}.qr-image{border-radius:12px;padding:10px;background:#fff;box-shadow:var(--shadow)}.qr-placeholder{background:var(--bg-soft);border-radius:12px}.join-form{display:flex;flex-direction:column;gap:12px;margin:6px 0 4px}.code-input{width:100%;text-align:center;letter-spacing:.35em;font-size:26px;font-weight:700;font-variant-numeric:tabular-nums;padding:14px 10px;background:var(--bg-soft);border:1.5px solid var(--border);border-radius:var(--radius-sm);color:var(--text);outline:none;transition:border-color .15s ease}.code-input:focus{border-color:var(--accent)}.primary-btn{background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);padding:13px 20px;font-size:15px;font-weight:600;font-family:var(--font);cursor:pointer;transition:filter .15s ease,transform .1s ease}.primary-btn:hover:not(:disabled){filter:brightness(1.08)}.primary-btn:active{transform:scale(.98)}.primary-btn:disabled{opacity:.45;cursor:not-allowed}.ghost-btn{background:none;border:1px solid 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var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}.connected-head{display:flex;justify-content:center;margin-bottom:16px}.pill{display:inline-flex;align-items:center;gap:7px;font-size:13px;font-weight:600;padding:6px 14px;border-radius:999px;background:var(--bg-soft);border:1px solid var(--border)}.pill.ok{color:var(--ok)}.pill .dot{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px #3ecf8e26}.safety{background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;margin-bottom:18px;text-align:center}.safety-head{display:flex;align-items:center;justify-content:center;gap:7px;color:var(--ok);font-size:13px;font-weight:600}.safety-number{display:block;font-size:20px;font-weight:700;letter-spacing:.08em;font-variant-numeric:tabular-nums;margin:8px 0 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4px}.file-drop-sub{font-size:12.5px;color:var(--text-faint);margin:0}.file-drop.disabled{opacity:.5;pointer-events:none}.transfer-list{list-style:none;padding:0;margin:4px 0 8px;display:flex;flex-direction:column;gap:10px}.transfer-row{display:flex;gap:12px;align-items:center;padding:12px 14px;background:var(--bg-soft);border:1px solid var(--border);border-radius:var(--radius-sm)}.transfer-icon{color:var(--text-dim);display:flex}.transfer-row.done .transfer-icon{color:var(--ok)}.transfer-body{flex:1;min-width:0}.transfer-top{display:flex;justify-content:space-between;gap:10px;font-size:13.5px;margin-bottom:7px}.transfer-name{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.transfer-size{color:var(--text-faint);flex-shrink:0}.progress-track{height:6px;background:var(--border);border-radius:999px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),#6aa0ff);border-radius:999px;transition:width .2s ease}.transfer-row.done 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env(safe-area-inset-bottom));color:var(--text-faint);font-size:12px}@keyframes spin{to{transform:rotate(360deg)}}@keyframes rise{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}@media(prefers-reduced-motion:reduce){*{animation-duration:.01ms!important;transition-duration:.01ms!important}}.share-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}.hint.subtle{opacity:.65;font-size:.85em}.hint.warn{color:#f0a020}.folder-btn{margin-top:10px}.io-tabs{display:flex;gap:6px;background:var(--bg-soft, #161b23);border-radius:10px;padding:4px;margin:16px 0 12px}.io-tabs button{flex:1;padding:8px 12px;border:none;border-radius:8px;background:transparent;color:inherit;cursor:pointer;font:inherit;opacity:.7}.io-tabs button.active{background:var(--bg, #0e1116);opacity:1;box-shadow:0 1px 3px #0000004d}.overall{margin:12px 0}.overall 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