@charset "UTF-8";*,*:before,*:after{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}:root{--primary: #2563eb;--primary-hover: #1d4ed8;--primary-light: #eff6ff;--bg: #f8fafc;--card-bg: #ffffff;--text-main: #0f172a;--text-muted: #64748b;--border: #e2e8f0;--danger: #ef4444;--success: #10b981;--radius: 12px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background-color:var(--bg);color:var(--text-main);line-height:1.5;height:100vh;overflow:hidden}#root{height:100%;display:flex;flex-direction:column}.app-container{display:flex;flex-direction:column;height:100%;max-width:800px;margin:0 auto;width:100%;background:var(--card-bg);box-shadow:0 0 25px #0000000d;position:relative}.app-header{height:56px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:#fff;z-index:10;flex-shrink:0}.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.05rem;color:var(--primary)}.header-actions{display:flex;align-items:center;gap:8px}.channel-bar{background:#f1f5f9;border-bottom:1px solid var(--border);padding:10px 16px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;flex-shrink:0}.channel-info{display:flex;align-items:center;gap:8px}.channel-code-badge{background:var(--primary);color:#fff;padding:3px 10px;font-weight:700;font-size:1.1rem;letter-spacing:2px;border-radius:6px;font-family:monospace}.channel-actions{display:flex;align-items:center;gap:6px}.message-feed{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px;background:#f8fafc;-webkit-overflow-scrolling:touch}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--text-muted);gap:10px;text-align:center;padding:24px}.msg-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px;box-shadow:0 2px 4px #00000005;display:flex;flex-direction:column;gap:8px;transition:transform .15s ease;word-break:break-word}.msg-header{display:flex;align-items:center;justify-content:space-between;font-size:.75rem;color:var(--text-muted)}.msg-tag{display:inline-flex;align-items:center;gap:4px;padding:2px 6px;border-radius:4px;font-size:.75rem;font-weight:600}.msg-tag.text{background:#e0f2fe;color:#0369a1}.msg-tag.image{background:#fef3c7;color:#b45309}.msg-tag.file{background:#dcfce7;color:#15803d}.msg-text-content{font-size:.95rem;white-space:pre-wrap;-webkit-user-select:text;user-select:text;line-height:1.6}.msg-image-thumb{max-width:100%;max-height:280px;object-fit:contain;border-radius:8px;background:#0000000a;cursor:pointer}.msg-file-box{display:flex;align-items:center;gap:12px;background:#f8fafc;padding:10px 12px;border-radius:8px;border:1px dashed var(--border)}.msg-footer{display:flex;align-items:center;justify-content:flex-end;gap:8px;margin-top:4px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:6px 12px;border-radius:8px;font-size:.85rem;font-weight:500;cursor:pointer;border:1px solid transparent;transition:all .15s ease;background:#f1f5f9;color:var(--text-main);text-decoration:none}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-ghost{background:transparent;border-color:transparent;color:var(--text-muted)}.btn-ghost:hover{background:#f1f5f9;color:var(--text-main)}.btn-danger{color:var(--danger)}.btn-danger:hover{background:#fee2e2}.btn-sm{padding:4px 8px;font-size:.78rem;border-radius:6px}.send-bar{background:#fff;border-top:1px solid var(--border);padding:10px 12px;display:flex;flex-direction:column;gap:8px;flex-shrink:0;padding-bottom:max(10px,env(safe-area-inset-bottom))}.send-input-row{display:flex;align-items:flex-end;gap:8px}.send-textarea{flex:1;border:1px solid var(--border);border-radius:8px;padding:8px 12px;font-size:.95rem;resize:none;max-height:120px;min-height:40px;font-family:inherit;outline:none;transition:border-color .2s}.send-textarea:focus{border-color:var(--primary)}.send-tools-row{display:flex;align-items:center;justify-content:space-between}.tool-buttons{display:flex;gap:8px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;padding:16px;z-index:100;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.modal-box{background:#fff;border-radius:var(--radius);max-width:440px;width:100%;padding:20px;box-shadow:0 10px 25px #0000001a;display:flex;flex-direction:column;gap:16px}.progress-bar-container{height:4px;background:#e2e8f0;border-radius:2px;overflow:hidden;margin-top:4px}.progress-bar-fill{height:100%;background:var(--primary);transition:width .2s ease}.toast-container{position:fixed;top:16px;left:50%;transform:translate(-50%);z-index:999;pointer-events:none}.toast{background:#1e293b;color:#fff;padding:8px 16px;border-radius:20px;font-size:.85rem;box-shadow:0 4px 12px #00000026;animation:fadeInOut 2.5s forwards}@keyframes fadeInOut{0%{opacity:0;transform:translateY(-10px)}15%{opacity:1;transform:translateY(0)}85%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(-10px)}}