:root {
            --sidebar-width: 280px;
            --header-height: 56px;
            --primary: #10a37f;
            --primary-dark: #0d8c6d;
            --bg-body: #f5f5f5;
            --bg-page: #ffffff;
            --bg-sidebar: #f9f9f9;
            --text-main: #1a1a1a;
            --text-secondary: #666;
            --border: #e5e5e5;
            --safe-bottom: env(safe-area-inset-bottom, 0px);
        }
        [data-theme="dark"] {
            --bg-body: #0a0a0a;
            --bg-page: #141414;
            --bg-sidebar: #0f0f0f;
            --text-main: #f0f0f0;
            --border: #2a2a2a;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { -webkit-text-size-adjust: 100%; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            font-size: 15px; line-height: 1.5; color: var(--text-main);
            background: var(--bg-body); height: 100vh; height: 100dvh;
            overflow: hidden;
        }
        .app-container { display: flex; width: 100%; height: 100%; }
        .sidebar {
            width: var(--sidebar-width); height: 100%; background: var(--bg-sidebar);
            border-right: 1px solid var(--border); display: flex; flex-direction: column;
        }
        .sidebar-content { flex: 1; overflow-y: auto; padding: 12px; }
        .user-card {
            display: flex; align-items: center; gap: 12px; padding: 12px;
            margin-bottom: 12px; border-radius: 10px; background: var(--bg-page);
            border: 1px solid var(--border); cursor: pointer; position: relative;
        }
        .user-card:hover { background: var(--bg-hover); }
        .dropdown-arrow { margin-left: auto; font-size: 12px; color: var(--text-tertiary); transition: transform 0.2s; }
        .user-card.active .dropdown-arrow { transform: rotate(180deg); }
        
        .user-dropdown {
            display: none; position: absolute; top: calc(100% + 4px); left: 0; right: 0;
            background: var(--bg-page); border: 1px solid var(--border); border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1); z-index: 100; overflow: hidden;
        }
        .user-dropdown.show { display: block; }
        .dropdown-item {
            display: flex; align-items: center; gap: 10px; padding: 12px 16px;
            color: var(--text-main); text-decoration: none; font-size: 14px;
            cursor: pointer; transition: background 0.15s;
        }
        .dropdown-item:hover { background: var(--bg-hover); }
        .dropdown-item i { font-size: 16px; color: var(--text-secondary); width: 20px; text-align: center; }
        .dropdown-item.logout { color: var(--danger); }
        .dropdown-item.logout i { color: var(--danger); }
        .dropdown-divider { height: 1px; background: var(--border); margin: 4px 0; }
        .user-avatar {
            width: 40px; height: 40px; border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            display: flex; align-items: center; justify-content: center;
            color: white; font-size: 16px; font-weight: 600;
            overflow: hidden; flex-shrink: 0;
        }
        .user-name { font-weight: 600; font-size: 14px; }
        .user-meta { font-size: 12px; color: var(--text-secondary); }
        .nav-section { margin-bottom: 16px; }
        .nav-title {
            font-size: 11px; font-weight: 600; color: var(--text-secondary);
            padding: 0 8px; margin-bottom: 8px;
        }
        .nav-btn {
            display: flex; align-items: center; gap: 10px; width: 100%;
            padding: 10px 12px; border: none; background: transparent;
            border-radius: 6px; color: var(--text-main); font-size: 14px;
            cursor: pointer; text-decoration: none;
        }
        .nav-btn:hover { background: rgba(0,0,0,0.04); }
        .nav-btn i { font-size: 16px; color: var(--primary); width: 20px; text-align: center; }
        .conversation-item-wrapper {
            display: flex; align-items: center; gap: 4px;
            position: relative;
        }
        .conversation-item {
            display: flex; align-items: center; gap: 10px;
            padding: 10px 12px; border-radius: 6px; cursor: pointer;
            font-size: 13px; color: var(--text-main); border: none;
            background: transparent; flex: 1; min-width: 0;
            text-align: left; overflow: hidden;
        }
        .conversation-title { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
        .conv-delete-btn {
            display: flex; align-items: center; justify-content: center;
            width: 28px; height: 28px; border: none; background: transparent;
            color: var(--text-tertiary); cursor: pointer; border-radius: 6px;
            opacity: 0; transition: all 0.15s; flex-shrink: 0;
        }
        .conversation-item-wrapper:hover .conv-delete-btn { opacity: 1; }
        .conv-delete-btn:hover { background: var(--danger-light); color: var(--danger); }
        @media (hover: none) and (pointer: coarse) {
            .conv-delete-btn { opacity: 1; }
        }
        .conversation-item:hover { background: rgba(0,0,0,0.04); }
        .conversation-item.active { background: rgba(16,163,127,0.08); color: var(--primary); }
        .conversation-title { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
        .main-content { flex: 1; display: flex; flex-direction: column; min-width: 0; background: var(--bg-page); }
        .header {
            height: var(--header-height); display: flex; align-items: center;
            justify-content: space-between; padding: 0 16px; border-bottom: none !important;
        }
        .btn-icon {
            width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
            border: none; background: transparent; border-radius: 6px; color: var(--text-secondary);
            font-size: 18px; cursor: pointer;
        }
        .btn-icon:hover { background: rgba(0,0,0,0.04); color: var(--text-main); }
        .chat-area { flex: 1; overflow-y: auto; padding: 20px; }
        .chat-inner { max-width: 800px; margin: 0 auto; }
        .welcome { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 60vh; text-align: center; }
        .welcome-icon { width: 80px; height: 80px; display: flex; align-items: center; justify-content: center; font-size: 48px; margin-bottom: 24px; }
        .welcome-icon img { width: 80px; height: 80px; object-fit: cover; border-radius: 50%; }
        .welcome-icon i { font-size: 48px; color: var(--primary); }
        .suggestions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; max-width: 600px; }
        .suggestion-btn { padding: 10px 18px; border: 1px solid var(--border); border-radius: 20px; background: var(--bg-page); color: var(--text-main); font-size: 14px; cursor: pointer; }
        .suggestion-btn:hover { border-color: var(--primary); color: var(--primary); }
        .message { display: flex; gap: 12px; margin-bottom: 24px; }
        .message-avatar { width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; flex-shrink: 0; overflow: hidden; background: transparent; }
        .message.user .message-avatar { background: #666; }
        .message-avatar img { width: 100%; height: 100%; object-fit: cover; }
        .message-avatar i { font-size: 14px; }
        .message-content { flex: 1; min-width: 0; max-width: calc(100% - 50px); }
        .message-header { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
        .message-author { font-weight: 600; font-size: 13px; }
        .message-time { font-size: 11px; color: var(--text-secondary); }
        .message-body { font-size: 15px; line-height: 1.7; word-wrap: break-word; }
        /* 代码块样式 - 白色主题下灰色背景，深色主题下深色背景 */
        .message-body pre { background: #f3f4f6; color: #1f2937; border-radius: 6px; padding: 16px; overflow-x: auto; margin: 12px 0; }
        [data-theme="dark"] .message-body pre { background: #1e1e1e; color: #d4d4d4; }
        .code-block-wrapper { position: relative; margin: 12px 0; }
        .code-block-btns { position: absolute; top: 8px; right: 8px; display: flex; gap: 6px; z-index: 100; background: rgba(0,0,0,0.3); padding: 4px 6px; border-radius: 6px; backdrop-filter: blur(4px); }
        .code-block-btns button { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; border: none; background: transparent; border-radius: 6px; color: var(--text-tertiary); cursor: pointer; font-size: 13px; transition: all 0.15s; }
        .code-block-btns button:hover { background: var(--bg-hover); color: var(--text-main); }
        .message-body pre code { background: transparent; color: inherit; }
        .message-body code { background: #e5e7eb; color: #1f2937; padding: 2px 6px; border-radius: 4px; font-family: Consolas, Monaco, monospace; font-size: 14px; }
        [data-theme="dark"] .message-body code { background: #2d2d2d; color: #d4d4d4; }
        
        /* 消息操作按钮 */
        .message-actions { display: flex; gap: 6px; margin-top: 8px; opacity: 0; transition: opacity 0.2s; }
        .message:hover .message-actions { opacity: 1; }
        @media (hover: none) and (pointer: coarse) {
            .message-actions { opacity: 1; }
        }
        .msg-action-btn { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; border: none; background: transparent; border-radius: 6px; color: var(--text-tertiary); cursor: pointer; font-size: 13px; transition: all 0.15s; }
        .msg-action-btn:hover { background: var(--bg-hover); color: var(--text-main); }
        .msg-action-btn:disabled { opacity: 0.4; cursor: not-allowed; pointer-events: none; }
        .msg-action-btn.edit:hover { color: var(--info); }
        .msg-action-btn.regenerate:hover { color: var(--primary); }
        .msg-action-btn.continue:hover { color: var(--warning); }
        .msg-action-btn.delete:hover { color: var(--danger); background: var(--danger-light); }
        
        /* 删除动画 */
        .message.deleting { opacity: 0; transform: translateX(-20px); transition: all 0.3s ease; }
        .input-area { border-top: none !important; padding: 12px 16px calc(12px + var(--safe-bottom)); }
        .input-wrapper { max-width: 800px; margin: 0 auto; }
        .input-box { background: var(--bg-body); border: 1px solid var(--border); border-radius: 16px; padding: 12px 16px; }
        .input-field { width: 100%; border: none; background: transparent; resize: none; font-size: 15px; outline: none; min-height: 44px; max-height: 150px; font-family: inherit; color: var(--text-main); }
        .input-toolbar { display: flex; align-items: center; justify-content: space-between; margin-top: 10px; }
        .toolbar-btn { display: flex; align-items: center; gap: 6px; padding: 6px 12px; border: none; background: transparent; border-radius: 6px; font-size: 13px; color: var(--text-secondary); cursor: pointer; }
        .toolbar-btn.active { background: rgba(16,163,127,0.1); color: var(--primary); }
        .send-btn { width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; border: none; background: var(--primary); color: white; border-radius: 6px; font-size: 16px; cursor: pointer; transition: all 0.2s; }
        .send-btn:disabled { opacity: 0.5; cursor: not-allowed; }
        .send-btn.stopping { background: var(--danger, #ef4444); animation: pulse 1.5s infinite; position: relative; overflow: visible; }
        @keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.7; } }
        @keyframes slideUp { 
            from { transform: translateY(30px); opacity: 0; } 
            to { transform: translateY(0); opacity: 1; } 
        }
        
        /* 流光环绕边框效果 */
        .send-btn.flowing-border::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 8px;
            background: conic-gradient(from 0deg, transparent, #3b82f6, #8b5cf6, #ec4899, #3b82f6, transparent);
            z-index: -1;
            animation: flowingBorder 2s linear infinite;
        }
        .send-btn.flowing-border::after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: 6px;
            background: var(--danger, #ef4444);
            z-index: -1;
        }
        @keyframes flowingBorder {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        .overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 90; opacity: 0; visibility: hidden; transition: all 0.3s; }
        .overlay.show { opacity: 1; visibility: visible; }
        @media (max-width: 768px) {
            .sidebar { position: fixed; left: 0; top: 0; height: 100vh; height: 100dvh; transform: translateX(-110%); transition: transform 0.3s ease; z-index: 1000; }
            .sidebar.open { transform: translateX(0); box-shadow: 0 4px 20px rgba(0,0,0,0.3); }
            .menu-toggle { display: flex !important; }
            .main-content { margin-left: 0; }
        }
        .typing { display: inline-flex; align-items: center; gap: 4px; margin-left: 8px; }
        .typing span { width: 8px; height: 8px; background: var(--primary); border-radius: 50%; animation: typing 1.4s infinite; }
        @keyframes typing { 0%, 80%, 100% { transform: scale(0); opacity: 0.5; } 40% { transform: scale(1); opacity: 1; } }
        
        /* Toast 提示弹窗 */
        .toast-notification {
            position: fixed;
            top: 20px;
            left: 50%;
            transform: translateX(-50%) translateY(-100px);
            background: rgba(0, 0, 0, 0.8);
            color: white;
            padding: 12px 24px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            z-index: 10000;
            opacity: 0;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(0,0,0,0.2);
        }
        .toast-notification.show {
            transform: translateX(-50%) translateY(0);
            opacity: 1;
        }
        .toast-notification i { font-size: 18px; }
        .toast-success { background: rgba(16, 163, 127, 0.9); }
        .toast-error { background: rgba(239, 68, 68, 0.9); }
        .toast-info { background: rgba(59, 130, 246, 0.9); }
        [data-theme="light"] .toast-notification {
            background: rgba(0, 0, 0, 0.8);
            color: white;
        }
        [data-theme="light"] .toast-success { background: rgba(16, 163, 127, 0.9); }
        [data-theme="light"] .toast-error { background: rgba(239, 68, 68, 0.9); }
        [data-theme="light"] .toast-info { background: rgba(59, 130, 246, 0.9); }
        
        /* 分享菜单 */
        .share-menu {
            position: fixed;
            top: 60px;
            right: 16px;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 8px;
            min-width: 180px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.15);
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transform: translateY(-10px);
            transition: all 0.2s ease;
        }
        .share-menu.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .share-menu-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 12px;
            border-radius: 8px;
            cursor: pointer;
            color: var(--text-main);
            font-size: 14px;
            transition: background 0.15s;
        }
        .share-menu-item:hover {
            background: var(--bg-hover);
        }
        .share-menu-item i {
            font-size: 18px;
            color: var(--primary);
            width: 20px;
            text-align: center;
        }
        .share-menu-divider {
            height: 1px;
            background: var(--border);
            margin: 8px 0;
        }
        .share-overlay {
            position: fixed;
            inset: 0;
            z-index: 999;
            opacity: 0;
            visibility: hidden;
            transition: all 0.2s;
        }
        .share-overlay.show {
            opacity: 1;
            visibility: visible;
        }


/* ========== 全局 Loading 样式 ========== */
#global-loader {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}
.loader-overlay {
    background: var(--bg-page, #fff);
    padding: 24px 32px;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    text-align: center;
}
.loader-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border, #e5e5e5);
    border-top-color: var(--primary, #10a37f);
    border-radius: 50%;
    animation: loader-spin 1s linear infinite;
    margin: 0 auto 12px;
}
@keyframes loader-spin {
    to { transform: rotate(360deg); }
}
.loader-text {
    font-size: 14px;
    color: var(--text-secondary, #666);
}

/* ========== 发送按钮 Loading 状态 ========== */
.send-btn.loading {
    opacity: 0.7;
    cursor: not-allowed;
}
.send-btn.loading::after {
    content: "";
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: loader-spin 0.8s linear infinite;
    margin-left: 6px;
    vertical-align: middle;
}

/* ========== RAG引用样式 ========== */
.rag-citations {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px dashed var(--border, #e5e5e5);
}

.citations-label {
    font-size: 12px;
    color: var(--text-secondary, #666);
    margin-bottom: 6px;
}

.citation-badge {
    display: inline-block;
    padding: 3px 8px;
    margin: 0 6px 6px 0;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.citation-badge:hover {
    opacity: 0.8;
}

.citation-system {
    background: rgba(59, 130, 246, 0.15);
    color: #3b82f6;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.citation-personal {
    background: rgba(16, 163, 127, 0.15);
    color: #10a37f;
    border: 1px solid rgba(16, 163, 127, 0.3);
}

[data-theme="dark"] .citation-system {
    background: rgba(59, 130, 246, 0.2);
    color: #60a5fa;
}

[data-theme="dark"] .citation-personal {
    background: rgba(16, 163, 127, 0.2);
    color: #34d399;
}

/* ========== 知识库类型选择器 ========== */
.kb-selector-wrapper {
    position: relative;
    display: inline-block;
}

.kb-selector-dropdown {
    position: absolute;
    bottom: 100%;
    left: 0;
    margin-bottom: 8px;
    background: var(--message-ai-bg, #fff);
    border: 1px solid var(--border-color, #e0e0e0);
    border-radius: 12px;
    box-shadow: 0 -4px 20px rgba(0,0,0,0.15);
    min-width: 160px;
    z-index: 1000;
    overflow: hidden;
}

.kb-selector-options {
    padding: 8px;
}

.kb-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-primary, #2d2d2d);
    font-size: 14px;
}

.kb-option:hover {
    background: rgba(0,0,0,0.03);
}

.kb-option.active {
    background: rgba(16, 163, 127, 0.1);
    color: #10a37f;
}

.kb-option i {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

.kb-option span {
    flex: 1;
    font-weight: 500;
}

.kb-selector-footer {
    padding: 10px;
    border-top: 1px solid var(--border-color, #e0e0e0);
    text-align: center;
}

.kb-selector-footer a {
    color: #10a37f;
    text-decoration: none;
    font-size: 12px;
}

.kb-selector-footer a:hover {
    text-decoration: underline;
}

[data-theme="dark"] .kb-selector-dropdown {
    background: #1a1a1a;
    border-color: rgba(255,255,255,0.1);
}

[data-theme="dark"] .kb-option {
    color: #e0e0e0;
}

[data-theme="dark"] .kb-option:hover {
    background: rgba(255,255,255,0.05);
}

[data-theme="dark"] .kb-option.active {
    background: rgba(16, 163, 127, 0.2);
    color: #34d399;
}

[data-theme="dark"] .kb-selector-footer {
    border-color: rgba(255,255,255,0.1);
}