/* Enhanced AgentFlow Pro Styles - Modern, Beautiful, and Feature-Rich */

    :root {
        /* Color Palette - Light Mode */
        --primary-color: #667eea;
        --primary-dark: #5a6fd8;
        --primary-light: #8b9eff;
        --secondary-color: #f093fb;
        --secondary-dark: #e374f7;
        --accent-color: #4facfe;
        --success-color: #00d4aa;
        --warning-color: #ffb946;
        --error-color: #ff6b6b;

        /* Neutral Colors */
        --bg-primary: #ffffff;
        --bg-secondary: #f8fafc;
        --bg-tertiary: #e2e8f0;
        --text-primary: #1a202c;
        --text-secondary: #4a5568;
        --text-muted: #718096;
        --border-color: #e2e8f0;
        --shadow-light: rgba(0, 0, 0, 0.1);
        --shadow-medium: rgba(0, 0, 0, 0.15);
        --shadow-strong: rgba(0, 0, 0, 0.25);

        /* Layout */
        --sidebar-width: 320px;
        --header-height: 70px;
        --input-height: 120px;
        --border-radius: 16px;
        --border-radius-sm: 8px;
        --border-radius-lg: 24px;

        /* Typography */
        --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        --font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
        --font-size-xs: 0.75rem;
        --font-size-sm: 0.875rem;
        --font-size-base: 1rem;
        --font-size-lg: 1.125rem;
        --font-size-xl: 1.25rem;
        --font-size-2xl: 1.5rem;
        --font-size-3xl: 1.875rem;
        --font-weight-light: 300;
        --font-weight-normal: 400;
        --font-weight-medium: 500;
        --font-weight-semibold: 600;
        --font-weight-bold: 700;
        --font-weight-black: 800;

        /* Animations */
        --transition-fast: 0.15s ease;
        --transition-normal: 0.25s ease;
        --transition-slow: 0.35s ease;
        --animation-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
        --animation-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

    /* Dark Mode Variables */
    [data-theme="dark"] {
        --bg-primary: #1a202c;
        --bg-secondary: #2d3748;
        --bg-tertiary: #4a5568;
        --text-primary: #f7fafc;
        --text-secondary: #e2e8f0;
        --text-muted: #a0aec0;
        --border-color: #4a5568;
        --shadow-light: rgba(0, 0, 0, 0.3);
        --shadow-medium: rgba(0, 0, 0, 0.4);
        --shadow-strong: rgba(0, 0, 0, 0.6);
    }

    /* Global Styles */
    * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    *::before,
    *::after {
        box-sizing: border-box;
    }

    html {
        font-size: 16px;
        scroll-behavior: smooth;
        -webkit-text-size-adjust: 100%;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }

    body {
        font-family: var(--font-family);
        font-size: var(--font-size-base);
        font-weight: var(--font-weight-normal);
        line-height: 1.6;
        color: var(--text-primary);
        background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
        overflow-x: hidden;
        transition: background-color var(--transition-normal), color var(--transition-normal);
    }

    /* Custom Scrollbar */
    ::-webkit-scrollbar {
        width: 8px;
        height: 8px;
    }

    ::-webkit-scrollbar-track {
        background: var(--bg-secondary);
        border-radius: 4px;
    }

    ::-webkit-scrollbar-thumb {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        border-radius: 4px;
        transition: background var(--transition-fast);
    }

    ::-webkit-scrollbar-thumb:hover {
        background: linear-gradient(135deg, var(--primary-dark), var(--secondary-dark));
    }

    /* Loading Screen */
    .loading-screen {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 9999;
        transition: opacity var(--transition-slow), visibility var(--transition-slow);
    }

    .loading-screen.hidden {
        opacity: 0;
        visibility: hidden;
    }

    .loading-content {
        text-align: center;
        color: white;
        animation: fadeInUp 0.8s var(--animation-smooth);
    }

    .loading-logo {
        margin-bottom: 2rem;
        animation: pulse 2s infinite;
    }

    .loading-content h2 {
        font-size: var(--font-size-3xl);
        font-weight: var(--font-weight-bold);
        margin-bottom: 0.5rem;
    }

    .loading-content p {
        font-size: var(--font-size-lg);
        opacity: 0.9;
        margin-bottom: 2rem;
    }

    .loading-bar {
        width: 200px;
        height: 4px;
        background: rgba(255, 255, 255, 0.2);
        border-radius: 2px;
        overflow: hidden;
        margin: 0 auto;
    }

    .loading-progress {
        width: 0%;
        height: 100%;
        background: white;
        border-radius: 2px;
        animation: loadingProgress 2s ease-out forwards;
    }

    /* App Container */
    .app-container {
        display: grid;
        grid-template-areas:
            "nav nav"
            "sidebar main";
        grid-template-columns: var(--sidebar-width) 1fr;
        grid-template-rows: var(--header-height) 1fr;
        height: 100vh;
        transition: grid-template-columns var(--transition-normal);
    }

    .app-container.sidebar-collapsed {
        grid-template-columns: 0 1fr;
    }

    /* Top Navigation */
    .top-nav {
        grid-area: nav;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 2rem;
        backdrop-filter: blur(10px);
        position: relative;
        z-index: 1000;
    }

    .nav-brand {
        display: flex;
        align-items: center;
        gap: 1rem;
        font-size: var(--font-size-xl);
        font-weight: var(--font-weight-bold);
        color: var(--text-primary);
    }

    .nav-brand i {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        font-size: 1.5rem;
    }

    .version-badge {
        font-size: var(--font-size-xs);
        background: var(--accent-color);
        color: white;
        padding: 0.25rem 0.5rem;
        border-radius: var(--border-radius-sm);
        font-weight: var(--font-weight-medium);
    }

    .nav-controls {
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .nav-btn {
        width: 40px;
        height: 40px;
        border: none;
        border-radius: var(--border-radius);
        background: var(--bg-secondary);
        color: var(--text-secondary);
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all var(--transition-fast);
        position: relative;
        overflow: hidden;
    }

    .nav-btn:hover {
        background: var(--border-color);
        transform: translateY(-1px);
        box-shadow: 0 4px 12px var(--shadow-light);
    }

    .nav-btn:active {
        transform: translateY(0);
    }

    .nav-btn.active {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
    }

    /* Sidebar */
    .sidebar {
        grid-area: sidebar;
        background: var(--bg-primary);
        border-right: 1px solid var(--border-color);
        display: flex;
        flex-direction: column;
        overflow: hidden;
        transition: transform var(--transition-normal);
    }

    .sidebar-collapsed .sidebar {
        transform: translateX(-100%);
    }

    .sidebar-header {
        padding: 1.5rem;
        border-bottom: 1px solid var(--border-color);
    }

    .sidebar-header h3 {
        font-size: var(--font-size-lg);
        font-weight: var(--font-weight-semibold);
        color: var(--text-primary);
        margin-bottom: 1rem;
    }

    .btn-new-chat {
        width: 100%;
        padding: 0.75rem 1rem;
        border: none;
        border-radius: var(--border-radius);
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
        font-weight: var(--font-weight-medium);
        cursor: pointer;
        transition: transform var(--transition-fast), box-shadow var(--transition-fast);
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.5rem;
    }

    .btn-new-chat:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
    }

    .conversation-list {
        flex: 1;
        overflow-y: auto;
        padding: 1rem;
    }

    .conversation-item {
        padding: 0.75rem;
        border-radius: var(--border-radius);
        cursor: pointer;
        margin-bottom: 0.5rem;
        transition: all var(--transition-fast);
        border: 1px solid transparent;
    }

    .conversation-item:hover {
        background: var(--bg-secondary);
        border-color: var(--border-color);
    }

    .conversation-item.active {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
    }

    .conversation-title {
        font-weight: var(--font-weight-medium);
        margin-bottom: 0.25rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .conversation-preview {
        font-size: var(--font-size-sm);
        opacity: 0.7;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .conversation-time {
        font-size: var(--font-size-xs);
        opacity: 0.6;
        margin-top: 0.25rem;
    }

    .sidebar-footer {
        padding: 1.5rem;
        border-top: 1px solid var(--border-color);
    }

    .usage-stats {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }

    .stat-item {
        text-align: center;
        padding: 0.75rem;
        background: var(--bg-secondary);
        border-radius: var(--border-radius);
    }

    .stat-label {
        display: block;
        font-size: var(--font-size-xs);
        color: var(--text-muted);
        margin-bottom: 0.25rem;
    }

    .stat-value {
        font-size: var(--font-size-xl);
        font-weight: var(--font-weight-bold);
        color: var(--primary-color);
    }

    /* Main Content */
    .main-content {
        grid-area: main;
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }

    /* Chat Header */
    .chat-header {
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        padding: 1.5rem 2rem;
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .chat-info h1 {
        font-size: var(--font-size-2xl);
        font-weight: var(--font-weight-bold);
        color: var(--text-primary);
        margin-bottom: 0.25rem;
    }

    .chat-info p {
        font-size: var(--font-size-sm);
        color: var(--text-muted);
    }

    .chat-actions {
        display: flex;
        gap: 0.5rem;
    }

    .action-btn {
        width: 40px;
        height: 40px;
        border: none;
        border-radius: var(--border-radius);
        background: var(--bg-secondary);
        color: var(--text-secondary);
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all var(--transition-fast);
    }

    .action-btn:hover {
        background: var(--border-color);
        transform: translateY(-1px);
    }

    /* Messages Container */
    .messages-container {
        flex: 1;
        overflow-y: auto;
        position: relative;
    }

    /* Welcome Screen */
    .welcome-screen {
        display: flex;
        align-items: center;
        justify-content: center;
        height: 100%;
        padding: 2rem;
    }

    .welcome-content {
        text-align: center;
        max-width: 800px;
    }

    .welcome-icon {
        margin-bottom: 2rem;
        color: var(--primary-color);
        animation: float 3s ease-in-out infinite;
    }

    .welcome-content h2 {
        font-size: var(--font-size-3xl);
        font-weight: var(--font-weight-bold);
        color: var(--text-primary);
        margin-bottom: 1rem;
    }

    .welcome-content > p {
        font-size: var(--font-size-lg);
        color: var(--text-muted);
        margin-bottom: 3rem;
    }

    .capability-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1.5rem;
        margin-bottom: 3rem;
    }

    .capability-card {
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius-lg);
        padding: 2rem 1.5rem;
        text-align: center;
        transition: all var(--transition-normal);
        position: relative;
        overflow: hidden;
    }

    .capability-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
        transition: left 0.6s ease;
    }

    .capability-card:hover::before {
        left: 100%;
    }

    .capability-card:hover {
        transform: translateY(-8px);
        box-shadow: 0 20px 60px var(--shadow-light);
        border-color: var(--primary-color);
    }

    .capability-card i {
        font-size: 2.5rem;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        margin-bottom: 1rem;
        display: block;
    }

    .capability-card h3 {
        font-size: var(--font-size-lg);
        font-weight: var(--font-weight-semibold);
        color: var(--text-primary);
        margin-bottom: 0.5rem;
    }

    .capability-card p {
        font-size: var(--font-size-sm);
        color: var(--text-muted);
    }

    .quick-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 1rem;
        justify-content: center;
    }

    .quick-action {
        padding: 0.75rem 1.5rem;
        border: 2px solid var(--border-color);
        border-radius: var(--border-radius-lg);
        background: var(--bg-primary);
        color: var(--text-primary);
        font-weight: var(--font-weight-medium);
        cursor: pointer;
        transition: all var(--transition-normal);
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .quick-action:hover {
        border-color: var(--primary-color);
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
        transform: translateY(-2px);
        box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
    }

    /* Messages */
    .messages {
        padding: 2rem;
        max-width: 1000px;
        margin: 0 auto;
        width: 100%;
    }

    .message {
        margin-bottom: 2rem;
        animation: messageSlideIn 0.5s var(--animation-smooth);
    }

    .message-header {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        margin-bottom: 0.75rem;
    }

    .message-avatar {
        width: 40px;
        height: 40px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: var(--font-weight-bold);
        flex-shrink: 0;
    }

    .message-avatar.user {
        background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
        color: white;
    }

    .message-avatar.assistant {
        background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
        color: white;
    }

    .message-avatar.system {
        background: linear-gradient(135deg, var(--success-color), var(--accent-color));
        color: white;
    }

    .message-info {
        flex: 1;
    }

    .message-sender {
        font-weight: var(--font-weight-semibold);
        color: var(--text-primary);
        margin-bottom: 0.25rem;
    }

    .message-time {
        font-size: var(--font-size-xs);
        color: var(--text-muted);
    }

    .message-actions {
        display: flex;
        gap: 0.5rem;
        opacity: 0;
        transition: opacity var(--transition-fast);
    }

    .message:hover .message-actions {
        opacity: 1;
    }

    .message-action {
        width: 30px;
        height: 30px;
        border: none;
        border-radius: var(--border-radius-sm);
        background: var(--bg-secondary);
        color: var(--text-muted);
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all var(--transition-fast);
    }

    .message-action:hover {
        background: var(--border-color);
        color: var(--text-primary);
    }

    .message-content {
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius-lg);
        padding: 1.5rem;
        position: relative;
        box-shadow: 0 2px 10px var(--shadow-light);
        transition: all var(--transition-fast);
    }

    .message-content:hover {
        box-shadow: 0 8px 30px var(--shadow-medium);
    }

    .message.user .message-content {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
        border: none;
    }

    .message.assistant .message-content {
        background: var(--bg-primary);
        border-left: 4px solid var(--primary-color);
    }

    .message.system .message-content {
        background: var(--bg-secondary);
        border-left: 4px solid var(--success-color);
        font-family: var(--font-family-mono);
        font-size: var(--font-size-sm);
    }

    /* Code Blocks */
    pre {
        background: #1e293b !important;
        border-radius: var(--border-radius);
        padding: 1.5rem;
        overflow-x: auto;
        margin: 1rem 0;
        border: 1px solid var(--border-color);
    }

    code {
        font-family: var(--font-family-mono);
        font-size: 0.9em;
        background: var(--bg-secondary);
        padding: 0.25rem 0.5rem;
        border-radius: 4px;
        color: var(--text-primary);
    }

    pre code {
        background: transparent;
        padding: 0;
        color: #e2e8f0;
    }

    /* Input Area */
    .input-area {
        background: var(--bg-primary);
        border-top: 1px solid var(--border-color);
        padding: 1.5rem 2rem;
        position: relative;
    }

    .file-drop-zone {
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(102, 126, 234, 0.1);
        border: 2px dashed var(--primary-color);
        border-radius: var(--border-radius-lg);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        z-index: 10;
    }

    .file-drop-zone.active {
        opacity: 1;
        visibility: visible;
    }

    .file-drop-zone i {
        font-size: 3rem;
        color: var(--primary-color);
        margin-bottom: 1rem;
    }

    .file-drop-zone p {
        color: var(--primary-color);
        font-weight: var(--font-weight-medium);
    }

    .input-container {
        max-width: 1000px;
        margin: 0 auto;
    }

    .input-wrapper {
        display: flex;
        align-items: flex-end;
        gap: 0.75rem;
        background: var(--bg-secondary);
        border: 2px solid var(--border-color);
        border-radius: var(--border-radius-lg);
        padding: 0.75rem 1rem;
        transition: all var(--transition-fast);
    }

    .input-wrapper:focus-within {
        border-color: var(--primary-color);
        box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    }

    .input-btn {
        width: 40px;
        height: 40px;
        border: none;
        border-radius: var(--border-radius);
        background: transparent;
        color: var(--text-muted);
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all var(--transition-fast);
        flex-shrink: 0;
    }

    .input-btn:hover {
        background: var(--border-color);
        color: var(--text-primary);
    }

    .voice-btn.active {
        background: var(--error-color);
        color: white;
        animation: pulse 2s infinite;
    }

    #user-input {
        flex: 1;
        border: none;
        outline: none;
        background: transparent;
        color: var(--text-primary);
        font-family: var(--font-family);
        font-size: var(--font-size-base);
        line-height: 1.5;
        resize: none;
        min-height: 40px;
        max-height: 200px;
        padding: 0.5rem;
    }

    #user-input::placeholder {
        color: var(--text-muted);
    }

    .input-actions {
        display: flex;
        gap: 0.5rem;
        align-items: center;
    }

    .send-btn {
        width: 40px;
        height: 40px;
        border: none;
        border-radius: var(--border-radius);
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all var(--transition-fast);
        position: relative;
        overflow: hidden;
    }

    .send-btn:hover:not(:disabled) {
        transform: scale(1.05);
        box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
    }

    .send-btn:disabled {
        opacity: 0.6;
        cursor: not-allowed;
    }

    .input-footer {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-top: 0.75rem;
    }

    .character-count {
        font-size: var(--font-size-xs);
        color: var(--text-muted);
    }

    .typing-indicator {
        display: none;
        align-items: center;
        gap: 0.5rem;
        font-size: var(--font-size-sm);
        color: var(--text-muted);
    }

    .typing-indicator.active {
        display: flex;
    }

    .typing-dots {
        display: flex;
        gap: 2px;
    }

    .typing-dots span {
        width: 4px;
        height: 4px;
        background: var(--primary-color);
        border-radius: 50%;
        animation: typingDot 1.4s infinite ease-in-out both;
    }

    .typing-dots span:nth-child(1) { animation-delay: -0.32s; }
    .typing-dots span:nth-child(2) { animation-delay: -0.16s; }

    /* Modal Styles */
    .modal {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.6);
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 2000;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        backdrop-filter: blur(5px);
    }

    .modal.active {
        opacity: 1;
        visibility: visible;
    }

    .modal-content {
        background: var(--bg-primary);
        border-radius: var(--border-radius-lg);
        box-shadow: 0 25px 50px var(--shadow-strong);
        max-width: 600px;
        width: 90%;
        max-height: 80vh;
        overflow: hidden;
        transform: scale(0.9);
        transition: transform var(--transition-normal);
    }

    .modal.active .modal-content {
        transform: scale(1);
    }

    .modal-header {
        padding: 1.5rem 2rem;
        border-bottom: 1px solid var(--border-color);
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .modal-header h2 {
        font-size: var(--font-size-xl);
        font-weight: var(--font-weight-semibold);
        color: var(--text-primary);
    }

    .modal-close {
        width: 40px;
        height: 40px;
        border: none;
        border-radius: var(--border-radius);
        background: transparent;
        color: var(--text-muted);
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all var(--transition-fast);
    }

    .modal-close:hover {
        background: var(--bg-secondary);
        color: var(--text-primary);
    }

    .modal-body {
        padding: 2rem;
        overflow-y: auto;
        max-height: 60vh;
    }

    .settings-tabs {
        display: flex;
        border-bottom: 1px solid var(--border-color);
        margin-bottom: 2rem;
    }

    .tab-btn {
        padding: 0.75rem 1.5rem;
        border: none;
        background: transparent;
        color: var(--text-muted);
        cursor: pointer;
        border-bottom: 2px solid transparent;
        transition: all var(--transition-fast);
        font-weight: var(--font-weight-medium);
    }

    .tab-btn:hover {
        color: var(--text-primary);
        background: var(--bg-secondary);
    }

    .tab-btn.active {
        color: var(--primary-color);
        border-bottom-color: var(--primary-color);
    }

    .tab-content {
        display: none;
    }

    .tab-content.active {
        display: block;
    }

    .form-group {
        margin-bottom: 1.5rem;
    }

    .form-group label {
        display: block;
        font-weight: var(--font-weight-medium);
        color: var(--text-primary);
        margin-bottom: 0.5rem;
    }

    .form-control {
        width: 100%;
        padding: 0.75rem 1rem;
        border: 2px solid var(--border-color);
        border-radius: var(--border-radius);
        background: var(--bg-secondary);
        color: var(--text-primary);
        font-family: var(--font-family);
        font-size: var(--font-size-base);
        transition: all var(--transition-fast);
    }

    .form-control:focus {
        outline: none;
        border-color: var(--primary-color);
        box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    }

    .input-with-icon {
        position: relative;
    }

    .toggle-visibility {
        position: absolute;
        right: 0.75rem;
        top: 50%;
        transform: translateY(-50%);
        background: none;
        border: none;
        color: var(--text-muted);
        cursor: pointer;
        padding: 0.5rem;
        border-radius: var(--border-radius-sm);
        transition: all var(--transition-fast);
    }

    .toggle-visibility:hover {
        background: var(--border-color);
        color: var(--text-primary);
    }

    .form-range {
        width: 100%;
        height: 6px;
        background: var(--border-color);
        border-radius: 3px;
        outline: none;
        -webkit-appearance: none;
    }

    .form-range::-webkit-slider-thumb {
        appearance: none;
        width: 20px;
        height: 20px;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        border-radius: 50%;
        cursor: pointer;
        box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
        transition: transform var(--transition-fast);
    }

    .form-range::-webkit-slider-thumb:hover {
        transform: scale(1.1);
    }

    .range-value {
        font-weight: var(--font-weight-medium);
        color: var(--primary-color);
        margin-left: 1rem;
    }

    .radio-group {
        display: flex;
        gap: 1rem;
    }

    .radio-label {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        cursor: pointer;
        font-weight: var(--font-weight-normal);
    }

    .radio-label input[type="radio"] {
        margin: 0;
    }

    .checkbox-label {
        display: flex;
        align-items: center;
        gap: 0.75rem;
        cursor: pointer;
        font-weight: var(--font-weight-normal);
    }

    .checkbox-label input[type="checkbox"] {
        margin: 0;
        width: 18px;
        height: 18px;
    }

    .modal-footer {
        padding: 1.5rem 2rem;
        border-top: 1px solid var(--border-color);
        display: flex;
        gap: 1rem;
        justify-content: flex-end;
    }

    .btn {
        padding: 0.75rem 1.5rem;
        border: 2px solid transparent;
        border-radius: var(--border-radius);
        font-family: var(--font-family);
        font-size: var(--font-size-sm);
        font-weight: var(--font-weight-medium);
        cursor: pointer;
        display: inline-flex;
        align-items: center;
        gap: 0.5rem;
        transition: all var(--transition-fast);
        text-decoration: none;
    }

    .btn-primary {
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        color: white;
    }

    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
    }

    .btn-secondary {
        background: var(--bg-secondary);
        color: var(--text-primary);
        border-color: var(--border-color);
    }

    .btn-secondary:hover {
        background: var(--border-color);
        transform: translateY(-1px);
    }

    .btn-danger {
        background: var(--error-color);
        color: white;
    }

    .btn-danger:hover {
        background: #e74c3c;
        transform: translateY(-2px);
        box-shadow: 0 8px 25px rgba(255, 107, 107, 0.4);
    }

    /* Performance Monitor */
    .performance-monitor {
        position: fixed;
        top: 100px;
        right: 2rem;
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        box-shadow: 0 8px 30px var(--shadow-light);
        z-index: 1500;
        opacity: 0;
        visibility: hidden;
        transform: translateX(100%);
        transition: all var(--transition-normal);
        min-width: 200px;
    }

    .performance-monitor.active {
        opacity: 1;
        visibility: visible;
        transform: translateX(0);
    }

    .perf-header {
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
        display: flex;
        align-items: center;
        justify-content: space-between;
    }

    .perf-header h4 {
        font-size: var(--font-size-sm);
        font-weight: var(--font-weight-semibold);
        color: var(--text-primary);
        margin: 0;
    }

    .perf-toggle {
        width: 30px;
        height: 30px;
        border: none;
        border-radius: var(--border-radius-sm);
        background: transparent;
        color: var(--text-muted);
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all var(--transition-fast);
    }

    .perf-toggle:hover {
        background: var(--bg-secondary);
        color: var(--text-primary);
    }

    .perf-metrics {
        padding: 1rem;
    }

    .metric {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0.5rem 0;
        border-bottom: 1px solid var(--border-color);
    }

    .metric:last-child {
        border-bottom: none;
    }

    .metric-label {
        font-size: var(--font-size-xs);
        color: var(--text-muted);
    }

    .metric-value {
        font-size: var(--font-size-sm);
        font-weight: var(--font-weight-semibold);
        color: var(--primary-color);
    }

    /* Toast Notifications */
    .toast-container {
        position: fixed;
        top: 2rem;
        right: 2rem;
        z-index: 3000;
        display: flex;
        flex-direction: column;
        gap: 0.75rem;
    }

    .toast {
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        padding: 1rem 1.5rem;
        box-shadow: 0 8px 30px var(--shadow-light);
        display: flex;
        align-items: center;
        gap: 0.75rem;
        min-width: 300px;
        transform: translateX(100%);
        animation: toastSlideIn 0.3s var(--animation-smooth) forwards;
        position: relative;
        overflow: hidden;
    }

    .toast::before {
        content: '';
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        width: 4px;
        background: var(--primary-color);
    }

    .toast.success::before { background: var(--success-color); }
    .toast.warning::before { background: var(--warning-color); }
    .toast.error::before { background: var(--error-color); }

    .toast-icon {
        flex-shrink: 0;
    }

    .toast-content {
        flex: 1;
    }

    .toast-title {
        font-weight: var(--font-weight-semibold);
        color: var(--text-primary);
        margin-bottom: 0.25rem;
    }

    .toast-message {
        font-size: var(--font-size-sm);
        color: var(--text-muted);
    }

    .toast-close {
        width: 24px;
        height: 24px;
        border: none;
        background: transparent;
        color: var(--text-muted);
        cursor: pointer;
        border-radius: var(--border-radius-sm);
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all var(--transition-fast);
    }

    .toast-close:hover {
        background: var(--bg-secondary);
        color: var(--text-primary);
    }

    /* Context Menu */
    .context-menu {
        position: fixed;
        background: var(--bg-primary);
        border: 1px solid var(--border-color);
        border-radius: var(--border-radius);
        box-shadow: 0 8px 30px var(--shadow-medium);
        padding: 0.5rem 0;
        z-index: 2500;
        opacity: 0;
        visibility: hidden;
        transform: scale(0.95);
        transition: all var(--transition-fast);
        min-width: 150px;
    }

    .context-menu.active {
        opacity: 1;
        visibility: visible;
        transform: scale(1);
    }

    .context-item {
        padding: 0.75rem 1rem;
        cursor: pointer;
        display: flex;
        align-items: center;
        gap: 0.75rem;
        font-size: var(--font-size-sm);
        color: var(--text-primary);
        transition: all var(--transition-fast);
    }

    .context-item:hover {
        background: var(--bg-secondary);
    }

    .context-item i {
        width: 16px;
        color: var(--text-muted);
    }

    /* Responsive Design */
    @media (max-width: 1024px) {
        .app-container {
            grid-template-areas:
                "nav"
                "main";
            grid-template-columns: 1fr;
            grid-template-rows: var(--header-height) 1fr;
        }

        .sidebar {
            position: fixed;
            top: var(--header-height);
            left: 0;
            bottom: 0;
            width: var(--sidebar-width);
            z-index: 1200;
            transform: translateX(-100%);
            transition: transform var(--transition-normal);
        }

        .sidebar.open {
            transform: translateX(0);
        }

        .capability-grid {
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 1rem;
        }

        .quick-actions {
            flex-direction: column;
            align-items: stretch;
        }
    }

    @media (max-width: 768px) {
        :root {
            --sidebar-width: 280px;
        }

        .top-nav {
            padding: 0 1rem;
        }

        .chat-header {
            padding: 1rem;
            flex-direction: column;
            gap: 1rem;
        }

        .input-area {
            padding: 1rem;
        }

        .messages {
            padding: 1rem;
        }

        .modal-content {
            width: 95%;
            margin: 1rem;
        }

        .modal-body {
            padding: 1rem;
        }

        .performance-monitor {
            right: 1rem;
            min-width: 180px;
        }

        .toast-container {
            right: 1rem;
            left: 1rem;
        }

        .toast {
            min-width: auto;
        }
    }

    @media (max-width: 480px) {
        .welcome-content h2 {
            font-size: var(--font-size-2xl);
        }

        .capability-grid {
            grid-template-columns: 1fr;
        }

        .input-wrapper {
            flex-direction: column;
            gap: 0.5rem;
        }

        .input-actions {
            align-self: stretch;
            justify-content: flex-end;
        }
    }

    /* Print Styles */
    @media print {
        .top-nav,
        .sidebar,
        .input-area,
        .chat-actions,
        .message-actions,
        .modal,
        .toast-container,
        .context-menu,
        .performance-monitor {
            display: none !important;
        }

        .app-container {
            grid-template-areas: "main";
            grid-template-columns: 1fr;
            grid-template-rows: 1fr;
        }

        .main-content {
            height: auto;
            overflow: visible;
        }

        .messages-container {
            height: auto;
            overflow: visible;
        }

        .message-content {
            break-inside: avoid;
            box-shadow: none !important;
            border: 1px solid #ccc !important;
        }
    }

    /* Animations */
    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(30px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    @keyframes messageSlideIn {
        from {
            opacity: 0;
            transform: translateY(20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    @keyframes loadingProgress {
        0% { width: 0%; }
        50% { width: 70%; }
        100% { width: 100%; }
    }

    @keyframes pulse {
        0%, 100% { 
            opacity: 1; 
            transform: scale(1);
        }
        50% { 
            opacity: 0.8; 
            transform: scale(0.95);
        }
    }

    @keyframes float {
        0%, 100% {
            transform: translateY(0);
        }
        50% {
            transform: translateY(-10px);
        }
    }

    @keyframes typingDot {
        0%, 80%, 100% {
            transform: scale(0);
        }
        40% {
            transform: scale(1);
        }
    }

    @keyframes toastSlideIn {
        from {
            transform: translateX(100%);
            opacity: 0;
        }
        to {
            transform: translateX(0);
            opacity: 1;
        }
    }

    @keyframes shimmer {
        0% {
            background-position: -200px 0;
        }
        100% {
            background-position: 200px 0;
        }
    }

    /* Accessibility Improvements */
    @media (prefers-reduced-motion: reduce) {
        * {
            animation-duration: 0.01ms !important;
            animation-iteration-count: 1 !important;
            transition-duration: 0.01ms !important;
        }
    }

    /* Focus Styles for Keyboard Navigation */
    button:focus-visible,
    input:focus-visible,
    textarea:focus-visible,
    select:focus-visible {
        outline: 2px solid var(--primary-color);
        outline-offset: 2px;
    }

    /* High Contrast Mode Support */
    @media (prefers-contrast: high) {
        :root {
            --border-color: #000000;
            --shadow-light: rgba(0, 0, 0, 0.5);
            --shadow-medium: rgba(0, 0, 0, 0.7);
            --shadow-strong: rgba(0, 0, 0, 0.9);
        }
    }

    /* Utility Classes */
    .sr-only {
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        margin: -1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        white-space: nowrap;
        border: 0;
    }

    .text-center { text-align: center; }
    .text-left { text-align: left; }
    .text-right { text-align: right; }

    .d-none { display: none !important; }
    .d-block { display: block !important; }
    .d-flex { display: flex !important; }
    .d-grid { display: grid !important; }

    .opacity-0 { opacity: 0; }
    .opacity-50 { opacity: 0.5; }
    .opacity-100 { opacity: 1; }

    .pointer-events-none { pointer-events: none; }
    .cursor-pointer { cursor: pointer; }
    .cursor-not-allowed { cursor: not-allowed; }

    /* Component-specific animations */
    .message-content.highlight {
        animation: highlight 2s ease-out;
    }

    @keyframes highlight {
        0% { background-color: rgba(102, 126, 234, 0.2); }
        100% { background-color: transparent; }
    }

    /* Loading states */
    .loading {
        position: relative;
        overflow: hidden;
    }

    .loading::after {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
        animation: shimmer 1.5s infinite;
    }

    /* Enhanced form elements */
    .form-control.error {
        border-color: var(--error-color);
        box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
    }

    .form-control.success {
        border-color: var(--success-color);
        box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.1);
    }

    .error-message {
        font-size: var(--font-size-xs);
        color: var(--error-color);
        margin-top: 0.25rem;
        display: flex;
        align-items: center;
        gap: 0.25rem;
    }

    .success-message {
        font-size: var(--font-size-xs);
        color: var(--success-color);
        margin-top: 0.25rem;
        display: flex;
        align-items: center;
        gap: 0.25rem;
    }