:root{color-scheme:light dark;--bg: #f5f6f8;--panel: #ffffff;--text: #1a1d21;--muted: #6b7280;--accent: #2563eb;--accent-soft: #dbeafe;--border: #e5e7eb;--danger: #dc2626;--success: #16a34a}@media(prefers-color-scheme:dark){:root{--bg: #111418;--panel: #1a1f26;--text: #e5e7eb;--muted: #9ca3af;--accent: #3b82f6;--accent-soft: #1e3a5f;--border: #2a3038}}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{font-family:system-ui,-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);font-size:14px}.app{display:flex;flex-direction:column;height:100%}.app-header{display:flex;align-items:center;justify-content:space-between;padding:10px 18px;border-bottom:1px solid var(--border);background:var(--panel)}.logo{font-weight:700;font-size:15px;letter-spacing:.3px}.header-right{display:flex;align-items:center;gap:12px}.badge{padding:2px 10px;border-radius:999px;font-size:12px}.badge.connected{background:color-mix(in srgb,var(--success) 18%,transparent);color:var(--success)}.badge.connecting{background:var(--accent-soft);color:var(--accent)}.badge.failed,.badge.idle{background:color-mix(in srgb,var(--danger) 15%,transparent);color:var(--danger)}.code{color:var(--muted);font-variant-numeric:tabular-nums}.error-banner{margin:10px 18px 0;padding:8px 12px;border-radius:8px;background:color-mix(in srgb,var(--danger) 12%,transparent);color:var(--danger)}button{font:inherit;border:none;border-radius:8px;cursor:pointer;padding:8px 16px;background:var(--panel);color:var(--text);border:1px solid var(--border);transition:opacity .15s}button:hover:not(:disabled){opacity:.85}button:disabled{opacity:.45;cursor:not-allowed}button.primary{background:var(--accent);color:#fff;border-color:transparent}button.ghost{background:transparent;border-color:var(--border)}button.small{padding:4px 10px;font-size:12px}input{font:inherit;padding:8px 12px;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text);outline:none}input:focus{border-color:var(--accent)}.pairing{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;padding:24px}.pairing h1{font-size:22px}.subtitle{color:var(--muted);margin-bottom:24px}.pair-cards{display:flex;gap:16px;width:100%;max-width:640px}.pair-card{flex:1;background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:20px;display:flex;flex-direction:column;gap:10px}.pair-card h2{font-size:15px}.pair-card p{color:var(--muted);flex:1}.join-row{display:flex;gap:8px}.join-row input{flex:1;text-align:center;font-size:18px;letter-spacing:6px;font-variant-numeric:tabular-nums}.transfer{flex:1;display:flex;flex-direction:column;gap:12px;padding:14px 18px;overflow:hidden}.diag-bar{display:flex;gap:12px;align-items:center;justify-content:center;font-size:11px;color:var(--muted);flex-wrap:wrap}.drop-zone{border:2px dashed var(--border);border-radius:12px;padding:22px;text-align:center;color:var(--muted);cursor:pointer;transition:border-color .15s,background .15s}.drop-zone.dragging{border-color:var(--accent);background:var(--accent-soft)}.drop-zone.disabled{opacity:.6;cursor:default}.drop-icon{font-size:22px;margin-bottom:4px}.file-list{display:flex;flex-direction:column;gap:6px;max-height:180px;overflow-y:auto}.file-item{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:8px 12px}.file-info{display:flex;flex-direction:column;gap:2px;min-width:0}.file-name{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:320px}.file-size{color:var(--muted);font-size:12px}.progress{position:relative;width:120px;height:18px;background:var(--bg);border-radius:999px;overflow:hidden}.progress-bar{height:100%;background:var(--accent);transition:width .2s}.progress-text{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:11px;color:var(--text)}.message-panel{flex:1;display:flex;flex-direction:column;min-height:0;background:var(--panel);border:1px solid var(--border);border-radius:12px}.message-list{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:6px}.empty-hint{margin:auto;color:var(--muted)}.message{display:flex}.message.out{justify-content:flex-end}.message.in{justify-content:flex-start}.message-bubble{max-width:70%;padding:8px 12px;border-radius:12px;background:var(--bg);border:1px solid var(--border);text-align:left;white-space:pre-wrap;word-break:break-word}.message.out .message-bubble{background:var(--accent);border-color:transparent;color:#fff}.message-input{display:flex;gap:8px;padding:10px;border-top:1px solid var(--border)}.message-input 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