/* =============================================================================
   VerbaMind UI Components - DARK THEME
   Header, Sidebar, Buttons, Cards, and AI Chat Modal
   Version: 2.0
   Created: November 11, 2025
   ============================================================================= */

/* =============================================================================
   HEADER COMPONENT
   ============================================================================= */

.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-6);
    z-index: 100;
}

.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-icon {
    color: var(--color-primary);
}

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

.search-bar {
    position: relative;
    width: 400px;
}

.search-input {
    width: 100%;
    padding: var(--space-3) var(--space-4) var(--space-3) 40px;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    font-size: var(--text-sm);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-tertiary);
}

.search-kbd {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    padding: 2px 6px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 11px;
    color: var(--color-text-tertiary);
    font-family: monospace;
}

.kb-stats-mini {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
}

.stat-number {
    font-weight: var(--font-semibold);
    color: var(--color-accent);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.icon-button {
    position: relative;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    color: var(--color-text-secondary);
}

.icon-button:hover {
    background: var(--color-bg-hover);
}

.notification-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-error);
    color: white;
    font-size: 10px;
    font-weight: var(--font-semibold);
    border-radius: var(--radius-full);
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    cursor: pointer;
    border: 2px solid var(--color-accent);
    min-height: 40px;
}

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

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    border: 2px solid var(--color-primary);
}

.user-name {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
}

.user-info-display {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* User Menu in Sidebar */
.user-menu-sidebar {
    cursor: pointer;
}

.user-menu-sidebar .dropdown-arrow {
    opacity: 0.5;
    transition: transform 0.2s;
}

.user-menu-sidebar:hover .dropdown-arrow {
    opacity: 1;
}

/* User Dropdown Menu */
.user-dropdown {
    position: fixed;
    bottom: 120px;
    left: 280px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    min-width: 220px;
    z-index: 10000 !important;
}

.dropdown-header {
    padding: var(--space-4);
    border-bottom: 1px solid var(--color-border);
}

.dropdown-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--space-2) 0;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--color-text-primary);
    text-decoration: none;
    cursor: pointer;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    font-size: var(--text-sm);
    transition: background 0.2s;
}

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

.dropdown-item.danger {
    color: #EF4444;
}

.dropdown-item.danger:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* =============================================================================
   SIDEBAR NAVIGATION
   ============================================================================= */

.sidebar {
    position: fixed;
    left: 0;
    top: 80px;
    bottom: 0;
    width: 260px;
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    z-index: 90;
}

.sidebar-nav {
    flex: 1;
    padding: var(--space-6) var(--space-4);
}

.nav-section {
    margin-bottom: var(--space-6);
}

.nav-section-title {
    font-size: 11px;
    font-weight: var(--font-semibold);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-3);
    padding: 0 var(--space-3);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    transition: all var(--transition-base);
    margin-bottom: 4px;
}

.nav-item:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

button.nav-item {
    width: 100%;
    border: none;
    background: transparent;
    text-align: left;
}

.nav-item.active {
    background: var(--color-primary);
    color: white;
}

.nav-icon {
    width: 20px;
    height: 20px;
}

.nav-label {
    flex: 1;
}

.nav-badge, .nav-count {
    padding: 2px 8px;
    background: var(--color-bg-primary);
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: var(--font-semibold);
}

.nav-item.active .nav-badge {
    background: rgba(255, 255, 255, 0.2);
}

.nav-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--space-4) 0;
}

/* AI Chat Trigger Button/Link */
.ai-chat-trigger {
    position: sticky;
    bottom: 0;
    width: 100%;
    padding: var(--space-4);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border: none;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.ai-chat-trigger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.chat-icon {
    width: 24px;
    height: 24px;
}

.chat-text {
    flex: 1;
    text-align: left;
}

.chat-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: white;
}

.chat-hint {
    display: block;
    font-size: 11px;
    color: rgba(255, 255, 255, 0.8);
    font-family: monospace;
}

/* =============================================================================
   MAIN CONTENT AREA
   ============================================================================= */

.main-content {
    margin-left: 260px;
    margin-top: 80px;
    min-height: calc(100vh - 80px);
    background: var(--color-bg-primary);
}

.content-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-8) var(--space-6);
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-8);
}

.page-title {
    margin-bottom: var(--space-2);
}

.page-subtitle {
    color: var(--color-text-tertiary);
    margin: 0;
}

.page-header-right {
    display: flex;
    gap: var(--space-3);
}

/* =============================================================================
   BUTTONS
   ============================================================================= */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-bg-primary);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-light);
}

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

.btn-icon {
    width: 16px;
    height: 16px;
}

/* =============================================================================
   AI CHAT MODAL - COMPLETE STYLES
   ============================================================================= */

/* Modal Overlay */
.ai-chat-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
}

.ai-chat-modal.active {
    display: flex;
}

.ai-chat-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

/* Modal Container */
.ai-chat-container {
    position: relative;
    width: 90%;
    max-width: 900px;
    max-height: 85vh;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: slideUp 0.3s ease;
}

/* Header */
.ai-chat-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(
        135deg,
        rgba(99, 102, 241, 0.05),
        rgba(132, 204, 22, 0.05)
    );
}

.ai-chat-title-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.ai-icon {
    padding: var(--space-2);
    background: var(--color-primary);
    border-radius: var(--radius-lg);
}

.ai-chat-title {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--color-text-primary);
    margin: 0;
}

.ai-chat-subtitle {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin: var(--space-1) 0 0;
}

.ai-chat-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: background var(--transition-base);
}

.ai-chat-close:hover {
    background: var(--color-bg-hover);
}

/* Knowledge Base Stats */
.ai-kb-stats {
    display: flex;
    gap: var(--space-6);
    padding: var(--space-4) var(--space-6);
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
}

.kb-stat-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.kb-stat-icon {
    color: var(--color-accent);
}

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

.kb-stat-label {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin-left: var(--space-1);
}

/* Suggested Prompts */
.suggested-prompts {
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

.suggestions-title {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-3);
}

.suggestions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-2);
}

.suggestion-chip {
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: left;
}

.suggestion-chip:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-primary);
    color: var(--color-text-primary);
    transform: translateY(-1px);
}

/* Chat Messages */
.ai-chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.chat-message {
    display: flex;
    gap: var(--space-4);
    animation: fadeIn 0.3s ease;
}

.message-avatar {
    flex-shrink: 0;
}

.message-avatar img {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
}

.ai-avatar {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(
        135deg,
        var(--color-primary),
        var(--color-accent)
    );
    border-radius: var(--radius-full);
}

.ai-avatar svg {
    width: 20px;
    height: 20px;
}

.message-content {
    flex: 1;
    max-width: 85%;
}

.message-text {
    padding: var(--space-4);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    margin: 0 0 var(--space-4) 0;
}

.user-message .message-text {
    background: var(--color-primary);
    color: white;
}

/* Source Citations */
.message-sources {
    margin-top: var(--space-4);
}

.sources-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-3);
}

.source-card {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-2);
    transition: all var(--transition-base);
}

.source-card:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-border-light);
}

.source-thumbnail {
    width: 80px;
    height: 45px;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-bg-secondary);
    flex-shrink: 0;
}

.source-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.source-info {
    flex: 1;
}

.source-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
}

.source-meta {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.source-actions {
    display: flex;
    gap: var(--space-2);
    align-items: center;
}

.btn-icon-small {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-icon-small:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-primary);
}

.btn-icon-small svg {
    width: 16px;
    height: 16px;
    color: var(--color-text-secondary);
}

/* Related Concepts */
.related-concepts {
    margin-top: var(--space-4);
}

.related-title {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.related-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.related-chip {
    padding: var(--space-2) var(--space-3);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition: all var(--transition-base);
}

.related-chip:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

/* Typing Indicator */
.ai-typing .message-content {
    background: var(--color-bg-tertiary);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
}

.typing-indicator {
    display: flex;
    gap: 4px;
    margin-bottom: var(--space-2);
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    animation: typingPulse 1.4s ease-in-out infinite;
}

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

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

.typing-text {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

/* Input Area */
.ai-chat-input-wrapper {
    padding: var(--space-6);
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-primary);
}

.ai-chat-input-container {
    display: flex;
    gap: var(--space-3);
    align-items: flex-end;
}

.ai-chat-input {
    flex: 1;
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    color: var(--color-text-primary);
    resize: none;
    max-height: 120px;
    transition: all var(--transition-base);
}

.ai-chat-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.ai-send-button {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
}

.ai-send-button:hover:not(:disabled) {
    background: var(--color-accent-hover);
    transform: translateY(-1px);
}

.ai-send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.ai-send-button svg {
    color: var(--color-bg-primary);
}

.ai-input-hint {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin-top: var(--space-2);
}

/* =============================================================================
   MOBILE RESPONSIVE
   ============================================================================= */

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

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

    .main-content {
        margin-left: 0;
    }

    .search-bar {
        width: 200px;
    }

    .ai-chat-container {
        width: 100%;
        max-width: 100%;
        max-height: 100vh;
        border-radius: 0;
    }

    .ai-kb-stats {
        flex-direction: column;
        gap: var(--space-3);
    }

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