:root {
    /* Color Palette */
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #252538;
    --bg-hover: #2d2d42;
    --bg-active: #363650;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    --border-color: #27273a;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

* {
    margin: 0;

    box-sizing: border-box;

    padding: 0;
}

body {
    overflow: hidden;

    background: var(--bg-primary);

    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
}

.app-container {
    display: flex;

    width: 100vw;
    height: 100vh;
}

/* Sidebar Styles */
.sidebar {
    display: flex;
    flex-direction: column;

    transition: transform var(--transition-base);

    border-right: 1px solid var(--border-color);

    width: 280px;

    background: var(--bg-secondary);
}

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

    padding: var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);

    margin-bottom: var(--spacing-lg);
}

.logo-icon {
    width: 32px;
    height: 32px;

    color: var(--accent-primary);
}

.logo h1 {
    background-clip: text;
    background: var(--accent-gradient);

    font-size: 1.5rem;
    font-weight: 700;

    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.new-chat-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);

    transition: all var(--transition-base);

    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    border: none;
    border-radius: var(--radius-lg);

    width: 100%;

    padding: var(--spacing-md);

    background: var(--accent-gradient);
    cursor: pointer;

    font-size: 0.95rem;
    font-weight: 600;
    color: white;
}

.new-chat-btn:hover {
    transform: translateY(-2px);

    box-shadow: 0 6px 16px rgba(99, 102, 241, 0.4);
}

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

.new-chat-btn svg {
    width: 20px;
    height: 20px;
}

.conversations-list {
    flex: 1;

    overflow-y: auto;

    padding: var(--spacing-md);
}

.conversation-item {
    position: relative;

    transition: all var(--transition-fast);

    margin-bottom: var(--spacing-sm);

    border: 1px solid transparent;
    border-radius: var(--radius-md);

    padding: var(--spacing-md);
    padding-right: 36px; /* Space for delete button */

    background: var(--bg-tertiary);
    cursor: pointer;
}

.conversation-item:hover {
    transform: translateX(4px);

    background: var(--bg-hover);

    border-color: var(--accent-primary);
}

.conversation-item .delete-btn {
    position: absolute;
    top: 50%;
    right: 8px;

    display: flex;
    justify-content: center;
    align-items: center;

    opacity: 0;
    transform: translateY(-50%);

    transition: all var(--transition-fast);

    border: none;
    border-radius: var(--radius-sm);

    padding: 4px;

    background: none;
    cursor: pointer;

    color: var(--text-tertiary);
}

.conversation-item:hover .delete-btn {
    opacity: 1;
}

.conversation-item .delete-btn:hover {
    background: rgba(239, 68, 68, 0.1);

    color: var(--error);
}

.conversation-item .delete-btn svg {
    width: 16px;
    height: 16px;
}

.conversation-item.active {
    background: var(--bg-active);

    border-color: var(--accent-primary);
}

.conversation-title {
    overflow: hidden;

    margin-bottom: var(--spacing-xs);

    font-size: 0.9rem;
    font-weight: 500;
    text-overflow: ellipsis;
    color: var(--text-primary);

    white-space: nowrap;
}

.conversation-preview {
    overflow: hidden;

    font-size: 0.8rem;
    text-overflow: ellipsis;
    color: var(--text-tertiary);

    white-space: nowrap;
}

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

    padding: var(--spacing-lg);
}

.server-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);

    margin-bottom: var(--spacing-md);

    border-radius: var(--radius-md);

    padding: var(--spacing-sm) var(--spacing-md);

    background: var(--bg-tertiary);
}

.status-indicator {
    animation: pulse 2s infinite;

    border-radius: 50%;

    width: 8px;
    height: 8px;

    background: var(--warning);
}

.status-indicator.connected {
    animation: none;

    background: var(--success);
}

.status-indicator.error {
    animation: none;

    background: var(--error);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.status-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.model-selector {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.model-selector label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.model-selector select {
    transition: all var(--transition-fast);

    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);

    padding: var(--spacing-sm) var(--spacing-md);

    background: var(--bg-tertiary);
    cursor: pointer;

    font-size: 0.9rem;
    color: var(--text-primary);
}

.model-selector select:hover {
    border-color: var(--accent-primary);
}

.model-selector select:focus {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);

    outline: none;
    border-color: var(--accent-primary);
}

/* Main Content Styles */
.main-content {
    display: flex;
    flex-direction: column;
    flex: 1;

    background: var(--bg-primary);
}

.chat-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);

    border-bottom: 1px solid var(--border-color);

    padding: var(--spacing-lg);

    background: var(--bg-secondary);
}

.menu-toggle {
    display: none;

    transition: background var(--transition-fast);

    border: none;
    border-radius: var(--radius-md);

    padding: var(--spacing-sm);

    background: none;
    cursor: pointer;

    color: var(--text-primary);
}

.menu-toggle:hover {
    background: var(--bg-hover);
}

.menu-toggle svg {
    width: 24px;
    height: 24px;
}

#chatTitle {
    flex: 1;

    font-size: 1.25rem;
    font-weight: 600;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.icon-btn {
    transition: all var(--transition-fast);

    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);

    padding: var(--spacing-sm);

    background: var(--bg-tertiary);
    cursor: pointer;

    color: var(--text-primary);
}

.icon-btn:hover {
    transform: scale(1.05);

    background: var(--bg-hover);

    border-color: var(--accent-primary);
}

.icon-btn svg {
    display: block;

    width: 20px;
    height: 20px;
}

.chat-messages {
    flex: 1;

    overflow-y: auto;

    padding: var(--spacing-xl);

    scroll-behavior: smooth;
}

/* Welcome Screen */
.welcome-screen {
    display: flex;
    justify-content: center;
    align-items: center;

    height: 100%;
}

.welcome-content {
    max-width: 800px;

    text-align: center;
}

.welcome-icon {
    margin: 0 auto var(--spacing-lg);

    width: 80px;
    height: 80px;

    color: var(--accent-primary);
}

.welcome-icon svg {
    width: 100%;
    height: 100%;
}

.welcome-content h2 {
    margin-bottom: var(--spacing-md);

    background-clip: text;
    background: var(--accent-gradient);

    font-size: 2rem;
    font-weight: 700;

    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.welcome-content p {
    margin-bottom: var(--spacing-xl);

    font-size: 1.1rem;
    color: var(--text-secondary);
}

.suggestion-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);

    margin-top: var(--spacing-xl);
}

.suggestion-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);

    transition: all var(--transition-base);

    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);

    padding: var(--spacing-lg);

    background: var(--bg-secondary);
    cursor: pointer;

    text-align: left;
}

.suggestion-card:hover {
    transform: translateY(-4px);

    box-shadow: var(--shadow-md);

    background: var(--bg-tertiary);

    border-color: var(--accent-primary);
}

.suggestion-card svg {
    width: 24px;
    height: 24px;

    color: var(--accent-primary);
}

.suggestion-card span {
    font-size: 0.95rem;
    color: var(--text-primary);
}

/* Message Styles */
.message {
    animation: fadeIn 0.3s ease;

    margin-bottom: var(--spacing-xl);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);

    margin-bottom: var(--spacing-md);
}

.message-avatar {
    display: flex;
    justify-content: center;
    align-items: center;

    border-radius: 50%;

    width: 36px;
    height: 36px;

    font-size: 0.9rem;
    font-weight: 600;
}

.message.user .message-avatar {
    background: var(--accent-gradient);

    color: white;
}

.message.assistant .message-avatar {
    border: 2px solid var(--accent-primary);

    background: var(--bg-tertiary);

    color: var(--accent-primary);
}

.message-author {
    font-size: 0.95rem;
    font-weight: 600;
}

.message-content {
    margin-left: 52px;

    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);

    padding: var(--spacing-lg);

    background: var(--bg-secondary);

    line-height: 1.7;
}

.message.user .message-content {
    background: var(--bg-tertiary);
}

.message-content p {
    margin-bottom: var(--spacing-md);
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content pre {
    overflow-x: auto;

    margin: var(--spacing-md) 0;

    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);

    padding: var(--spacing-md);

    background: var(--bg-primary);
}

.message-content code {
    border-radius: var(--radius-sm);

    padding: 2px 6px;

    background: var(--bg-primary);

    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

.message-content pre code {
    padding: 0;

    background: none;
}

.typing-indicator {
    display: flex;
    gap: var(--spacing-sm);

    padding: var(--spacing-md);
}

.typing-dot {
    animation: typing 1.4s infinite;

    border-radius: 50%;

    width: 8px;
    height: 8px;

    background: var(--accent-primary);
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% {
        opacity: 0.7;
        transform: translateY(0);
    }
    30% {
        opacity: 1;
        transform: translateY(-10px);
    }
}

/* Chat Input Styles */
.chat-input-container {
    border-top: 1px solid var(--border-color);

    padding: var(--spacing-lg);

    background: var(--bg-secondary);
}

.chat-input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-md);

    transition: all var(--transition-fast);

    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);

    padding: var(--spacing-md);

    background: var(--bg-tertiary);
}

.chat-input-wrapper:focus-within {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);

    border-color: var(--accent-primary);
}

#messageInput {
    flex: 1;

    border: none;

    max-height: 200px;

    background: none;

    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);

    resize: none;
    outline: none;
}

#messageInput::placeholder {
    color: var(--text-tertiary);
}

.send-btn {
    display: flex;
    flex-shrink: 0;
    justify-content: center;
    align-items: center;

    transition: all var(--transition-base);

    border: none;
    border-radius: var(--radius-md);

    width: 40px;
    height: 40px;

    background: var(--accent-gradient);
    cursor: pointer;

    color: white;
}

.send-btn:hover:not(:disabled) {
    transform: scale(1.05);

    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.send-btn:active:not(:disabled) {
    transform: scale(0.95);
}

.send-btn:disabled {
    opacity: 0.5;

    cursor: not-allowed;
}

.send-btn svg {
    width: 20px;
    height: 20px;
}

.input-footer {
    display: flex;
    justify-content: flex-end;

    margin-top: var(--spacing-sm);
}

.char-count {
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

/* Modal Styles */
.modal {
    z-index: 1000;
    position: fixed;
    top: 0;
    left: 0;

    display: none;
    justify-content: center;
    align-items: center;

    width: 100%;
    height: 100%;

    background: rgba(0, 0, 0, 0.7);

    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    overflow: hidden;

    animation: modalSlideIn 0.3s ease;

    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);

    width: 90%;
    max-width: 500px;
    max-height: 90vh;

    background: var(--bg-secondary);
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;

    border-bottom: 1px solid var(--border-color);

    padding: var(--spacing-lg);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.close-btn {
    transition: all var(--transition-fast);

    border: none;
    border-radius: var(--radius-md);

    padding: var(--spacing-sm);

    background: none;
    cursor: pointer;

    color: var(--text-secondary);
}

.close-btn:hover {
    background: var(--bg-hover);

    color: var(--text-primary);
}

.close-btn svg {
    width: 20px;
    height: 20px;
}

.modal-body {
    overflow-y: auto;

    max-height: 60vh;

    padding: var(--spacing-lg);
}

.setting-group {
    margin-bottom: var(--spacing-lg);
}

.setting-group label {
    display: block;

    margin-bottom: var(--spacing-sm);

    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.setting-group input[type="text"],
.setting-group input[type="number"] {
    transition: all var(--transition-fast);

    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);

    width: 100%;

    padding: var(--spacing-md);

    background: var(--bg-tertiary);

    font-size: 0.95rem;
    color: var(--text-primary);
}

.setting-group input[type="text"]:focus,
.setting-group input[type="number"]:focus {
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);

    outline: none;
    border-color: var(--accent-primary);
}

.setting-group input[type="range"] {
    border-radius: var(--radius-sm);

    width: 100%;
    height: 6px;

    background: var(--bg-tertiary);

    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.setting-group input[type="range"]::-webkit-slider-thumb {
    transition: all var(--transition-fast);

    border-radius: 50%;

    width: 18px;
    height: 18px;

    background: var(--accent-gradient);
    cursor: pointer;

    -webkit-appearance: none;
}

.setting-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);

    border-top: 1px solid var(--border-color);

    padding: var(--spacing-lg);
}

.btn-primary,
.btn-secondary {
    transition: all var(--transition-base);

    border: none;
    border-radius: var(--radius-md);

    padding: var(--spacing-md) var(--spacing-lg);

    cursor: pointer;

    font-size: 0.95rem;
    font-weight: 600;
}

.btn-primary {
    background: var(--accent-gradient);

    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);

    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    border: 1px solid var(--border-color);

    background: var(--bg-tertiary);

    color: var(--text-primary);
}

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

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

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    border-radius: var(--radius-sm);

    background: var(--bg-hover);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--bg-active);
}

.empty-state {
    padding: var(--spacing-xl);
    font-size: 0.9rem;
    font-style: italic;
    text-align: center;
    color: var(--text-tertiary);
    grid-column: 1 / -1;
}

/* Sidebar Navigation */
.sidebar-nav {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.1);
}

.nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: none !important;
    background-color: transparent !important;
    border: none !important;
    border-radius: var(--radius-md);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    outline: none !important;
    box-shadow: none !important;
    -webkit-tap-highlight-color: transparent;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.05) !important;
    color: var(--text-primary);
}

.nav-item.active {
    background: rgba(99, 102, 241, 0.1) !important;
    color: var(--accent-primary);
    border-color: rgba(99, 102, 241, 0.3);
}

.nav-item svg {
    width: 22px;
    height: 22px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
}

.nav-item span {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Page Navigation logic */
.page {
    display: none;
    flex-direction: column;
    height: 100vh;
}

.page.active {
    display: flex;
}

/* Knowledge Base Page Styling */
#pageKnowledge {
    background: var(--bg-primary);
    overflow-y: auto;
}

.page-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.kb-container {
    padding: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.kb-hero {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-xl);
}

.kb-icon {
    width: 64px;
    height: 64px;
    background: var(--accent-gradient);
    border-radius: 20%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    color: white;
}

.kb-icon svg {
    width: 32px;
    height: 32px;
}

.kb-hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--spacing-sm);
}

.kb-hero p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.large-upload-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-xl);
    color: white;
    font-weight: 700;
    font-size: 1.1rem;
    cursor: pointer;
    margin: 0 auto;
    transition: all var(--transition-base);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.large-upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.large-upload-btn svg {
    width: 24px;
    height: 24px;
}

.kb-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-primary);
}

.stat-label {
    color: var(--text-tertiary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.kb-list-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    margin-top: var(--spacing-xl);
}

.kb-table-header {
    display: grid;
    grid-template-columns: 2fr 80px 80px 3fr 60px;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 2px solid var(--border-color);
    font-weight: 700;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.kb-list {
    display: flex;
    flex-direction: column;
}

.kb-item {
    display: grid;
    grid-template-columns: 2fr 80px 80px 3fr 60px;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.kb-item:last-child {
    border-bottom: none;
}

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

.kb-col-name {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    font-size: 0.85rem;
}

.kb-col-name svg {
    flex-shrink: 0;
    color: var(--accent-primary);
    width: 14px;
    height: 14px;
}

.kb-col-name span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.kb-col-type {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.kb-col-size {
    color: var(--text-tertiary);
    font-size: 0.8rem;
}

.kb-col-desc {
    color: var(--text-secondary);
    font-size: 0.8rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-right: var(--spacing-md);
}

.kb-col-actions {
    display: flex;
    justify-content: flex-end;
}

.delete-card-btn {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.delete-card-btn:hover {
    color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

@media (max-width: 900px) {
    .kb-table-header {
        display: none;
    }
    .kb-item {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-sm);
    }
    .kb-col-desc {
        grid-column: span 2;
    }
}

/* Redefine Sidebar layout */
.sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

/* Upload Button Styles */
.upload-btn {
    display: flex;
    flex-shrink: 0;
    justify-content: center;
    align-items: center;

    transition: all var(--transition-fast);

    border: none;
    border-radius: var(--radius-md);

    width: 44px;
    height: 44px;
    min-width: 44px;

    background: rgba(99, 102, 241, 0.1);
    cursor: pointer;

    color: var(--accent-primary);
}

.upload-btn:hover {
    background: var(--bg-hover);

    color: var(--accent-primary);
}

.upload-btn svg {
    width: 20px;
    height: 20px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        z-index: 1000;
        position: fixed;
        top: 0;
        bottom: 0;
        left: 0;

        transform: translateX(-100%);
    }

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

    .menu-toggle {
        display: block;
    }

    .chat-messages {
        padding: var(--spacing-md);
    }

    .message-content {
        margin-top: var(--spacing-sm);
        margin-left: 0;
    }
    
    .suggestion-cards {
        grid-template-columns: 1fr;
    }
    
    .welcome-content h2 {
        font-size: 1.5rem;
    }
}