:root{--bot-primary-color: #409eff;--bot-bg-color: #f5f7fa;--bot-header-bg: #ffffff;--bot-user-bubble-bg: #409eff;--bot-assistant-bubble-bg: #ffffff;--bot-border-radius: 12px;--bot-font-family: system-ui, -apple-system, sans-serif;--bot-text-color: #303133;--bot-muted-color: #909399;--bot-header-title-color: #3d4a5c;--bot-welcome-title-color: #5c6678;--bot-welcome-title-size: 16px;--bot-sidebar-width: 220px;--bot-float-panel-width: 494px;--bot-float-panel-height: 624px;--bot-float-scale: 1.3;--bot-panel-sidebar-width: 220px;--bot-panel-main-width: 720px;--bot-panel-frame-width: 960px;--bot-panel-header-height: 52px;--bot-panel-history-title-height: 41px;--bot-panel-history-item-height: 56px;--bot-panel-history-visible-count: 8;--bot-panel-body-min-height: calc( var(--bot-panel-history-title-height) + var(--bot-panel-history-item-height) * var(--bot-panel-history-visible-count) );--bot-panel-frame-min-height: calc( var(--bot-panel-header-height) + var(--bot-panel-body-min-height) 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#dcdfe6;border-radius:var(--bot-border-radius);background:#fff;transition:border-color .2s}.chat-composer:focus-within{border-color:var(--bot-primary-color)}.btn-attach{display:flex;align-items:center;justify-content:center;width:36px;height:36px;flex-shrink:0;color:var(--bot-muted-color);cursor:pointer;border-radius:8px;transition:color .2s,background .2s}.btn-attach:hover{color:var(--bot-primary-color);background:#409eff14}.chat-composer textarea{flex:1;resize:none;min-height:36px;max-height:120px;padding:8px 0;border:none;background:transparent;font-family:inherit;font-size:14px;line-height:1.5;outline:none}.chat-composer textarea::placeholder{font-size:12px;color:#a8abb2;line-height:1.5}.message-text .message-streaming-plain{white-space:pre-wrap;word-break:break-word;color:#6d6f6f}.btn-send{flex-shrink:0;border:none;background:var(--bot-primary-color);color:#fff;border-radius:8px;padding:8px 16px;min-height:36px;cursor:pointer;font-size:14px}.btn-send:disabled{opacity:.5;cursor:not-allowed}.btn-send.btn-stop{background:#f56c6c}.btn-send.btn-stop:disabled{opacity:1;cursor:pointer}.chat-limit-banner{display:flex;align-items:center;flex-wrap:wrap;gap:4px}.chat-limit-new-btn{border:none;background:none;color:var(--bot-primary-color);cursor:pointer;font-size:13px;font-weight:600;padding:0;text-decoration:underline}.chat-auth-banner{margin:12px 16px 0;padding:10px 12px;border-radius:8px;background:#fff7e6;border:1px solid #ffd591;color:#ad6800;font-size:13px;line-height:1.5}.chat-composer.is-disabled{opacity:.65}.btn-attach.disabled{pointer-events:none;opacity:.5;cursor:not-allowed}.prompt-grid button:disabled{opacity:.5;cursor:not-allowed}.chat-error{color:#f56c6c;font-size:13px;margin-top:6px;padding:0 4px}.chat-toast{position:fixed;bottom:80px;left:50%;transform:translate(-50%);background:#000000bf;color:#fff;padding:8px 16px;border-radius:8px;font-size:13px;z-index:100}.chat-confirm-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:200}.chat-confirm-dialog{background:var(--bot-header-bg);border-radius:var(--bot-border-radius);padding:20px 24px;max-width:320px;width:90%;box-shadow:0 8px 32px #0003}.chat-confirm-dialog p{margin:0 0 16px;font-size:14px;line-height:1.5}.chat-confirm-actions{display:flex;justify-content:flex-end;gap:8px}.chat-confirm-actions button{border:1px solid #dcdfe6;background:#fff;color:var(--bot-text-color);border-radius:6px;padding:6px 16px;font-size:13px;cursor:pointer}.chat-confirm-actions button.danger{border-color:#f56c6c;background:#f56c6c;color:#fff}.chat-confirm-actions button:disabled{opacity:.5;cursor:not-allowed}.image-preview-modal{position:fixed;top:0;right:0;bottom:0;left:0;background-color:#000000eb;display:flex;align-items:center;justify-content:center;z-index:10000;animation:image-preview-fade-in .2s ease-in-out}@keyframes image-preview-fade-in{0%{opacity:0}to{opacity:1}}.preview-top-bar{position:absolute;top:0;left:0;right:0;height:56px;display:flex;align-items:center;justify-content:center;z-index:10002;pointer-events:none}.preview-counter{color:#ffffffd9;font-size:14px;background:#0006;padding:4px 12px;border-radius:12px}.preview-close{position:absolute;top:12px;right:16px;width:40px;height:40px;background-color:#ffffff26;color:#fff;border:none;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:24px;line-height:1;cursor:pointer;transition:all .2s;pointer-events:auto;z-index:10003}.preview-close:hover{background-color:#ffffff4d;transform:rotate(90deg)}.preview-nav{position:absolute;top:50%;transform:translateY(-50%);width:44px;height:64px;background:#ffffff1f;border:none;color:#fff;font-size:32px;line-height:1;cursor:pointer;z-index:10002;transition:background .2s;display:flex;align-items:center;justify-content:center}.preview-nav:hover:not(:disabled){background:#ffffff40}.preview-nav:disabled{opacity:.3;cursor:not-allowed}.preview-nav-prev{left:12px;border-radius:0 8px 8px 0}.preview-nav-next{right:12px;border-radius:8px 0 0 8px}.preview-thumbnails{position:absolute;bottom:100px;left:50%;transform:translate(-50%);display:flex;gap:8px;max-width:90%;overflow-x:auto;padding:8px;z-index:10002}.preview-thumb{width:48px;height:48px;border-radius:6px;overflow:hidden;border:2px solid transparent;padding:0;cursor:pointer;flex-shrink:0;background:none;opacity:.6;transition:all .2s}.preview-thumb.active{border-color:var(--bot-primary-color, #409eff);opacity:1}.preview-thumb img{width:100%;height:100%;object-fit:cover;display:block}.preview-controls{position:absolute;bottom:60px;left:50%;transform:translate(-50%);display:flex;gap:12px;z-index:10002}.preview-btn{min-width:48px;height:48px;padding:0 12px;background-color:#ffffff26;border:1px solid rgba(255,255,255,.2);border-radius:24px;color:#fff;font-size:18px;line-height:1;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.preview-btn-reset{font-size:14px;padding:0 16px}.preview-btn:hover{background-color:#ffffff40;transform:scale(1.08)}.preview-image-container{width:100%;height:100%;display:flex;align-items:center;justify-content:center;overflow:hidden}.preview-image{max-width:90%;max-height:90%;object-fit:contain;border-radius:8px;box-shadow:0 4px 20px #00000080;animation:image-preview-zoom-in .3s ease-out;transition:transform .15s ease-out;transform-origin:center center;cursor:grab;-webkit-user-select:none;user-select:none}.preview-image:active{cursor:grabbing}@keyframes image-preview-zoom-in{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}