/* ============================================
   TEKTA RAG Agent - Main Styles
   ============================================ */

:root {
    /* Color Palette - Soft Blue Theme */
    --primary-50: #e6f2ff;
    --primary-100: #b3d9ff;
    --primary-200: #80bfff;
    --primary-300: #4da6ff;
    --primary-400: #1a8cff;
    --primary-500: #0073e6;
    --primary-600: #005bb3;
    --primary-700: #004280;
    --primary-800: #002a4d;
    --primary-900: #00121a;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Semantic Colors */
    --success: #10b981;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    
    /* Glass Effect Variables */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-shadow: 0 8px 32px rgba(0, 115, 230, 0.1);
    --glass-blur: 20px;
    
    /* Typography */
    --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Layout */
    --nav-width: 260px;
    --header-height: 64px;
}

/* ============================================
   Reset & Base Styles
   ============================================ */

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-weight: 400;
    line-height: 1.6;
    color: var(--gray-800);
    background: linear-gradient(135deg, #e6f2ff 0%, #f0f7ff 50%, #e6f0fa 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ============================================
   Layout
   ============================================ */

.app-container {
    display: flex;
    min-height: 100vh;
    position: relative;
}

.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.main-content {
    flex: 1;
    margin-left: var(--nav-width);
    padding: var(--space-xl);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   Navigation Panel
   ============================================ */

.nav-panel {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--nav-width);
    display: flex;
    flex-direction: column;
    padding: var(--space-lg);
    z-index: 100;
}

.nav-header {
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: var(--space-lg);
}

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

.logo-icon {
    font-size: 1.5rem;
    color: var(--primary-500);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--gray-600);
    font-size: 0.95rem;
    font-weight: 500;
    text-align: left;
    width: 100%;
}

.nav-item:hover {
    background: rgba(0, 115, 230, 0.1);
    color: var(--primary-600);
}

.nav-item.active {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: var(--white);
    box-shadow: 0 4px 15px rgba(0, 115, 230, 0.3);
}

.nav-icon {
    font-size: 1.2rem;
}

.nav-footer {
    padding-top: var(--space-lg);
    border-top: 1px solid var(--glass-border);
    margin-top: auto;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    margin-bottom: var(--space-md);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.user-details {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--gray-800);
}

.user-role {
    font-size: 0.75rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.logout-btn {
    color: var(--danger) !important;
}

.logout-btn:hover {
    background: var(--danger-light) !important;
}

/* ============================================
   Sections
   ============================================ */

.section {
    flex: 1;
    display: flex;
    flex-direction: column;
    animation: fadeIn var(--transition-slow);
}

.section.hidden {
    display: none;
}

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

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--gray-800);
}

/* ============================================
   Auth Section
   ============================================ */

.auth-section {
    justify-content: center;
    align-items: center;
}

.auth-container {
    width: 100%;
    max-width: 420px;
    padding: var(--space-2xl);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.auth-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: var(--space-sm);
}

.auth-header p {
    color: var(--gray-500);
}

.auth-tabs {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    padding: var(--space-xs);
    background: rgba(0, 115, 230, 0.05);
    border-radius: var(--radius-md);
}

.auth-tab {
    flex: 1;
    padding: var(--space-md);
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 500;
    color: var(--gray-600);
    transition: all var(--transition-base);
}

.auth-tab.active {
    background: var(--white);
    color: var(--primary-600);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.auth-form.hidden {
    display: none;
}

/* ============================================
   Forms
   ============================================ */

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
}

/* ============================================
   Chat Components
   ============================================ */

.chat-list-view,
.document-list-view {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.chat-list,
.document-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    overflow-y: auto;
}

.chat-item,
.document-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    cursor: pointer;
    transition: all var(--transition-base);
}

.chat-item:hover,
.document-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 115, 230, 0.15);
}

.chat-icon,
.document-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.chat-details,
.document-details {
    flex: 1;
    min-width: 0;
}

.chat-title,
.document-title {
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-preview,
.document-preview {
    font-size: 0.875rem;
    color: var(--gray-500);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-meta,
.document-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--space-xs);
}

.doc-delete-btn {
    opacity: 0;
    transition: opacity var(--transition-base);
    padding: var(--space-xs);
    font-size: 0.9rem;
}

.document-item:hover .doc-delete-btn {
    opacity: 0.7;
}

.doc-delete-btn:hover {
    opacity: 1 !important;
    color: var(--danger);
}

.chat-time,
.document-time {
    font-size: 0.75rem;
    color: var(--gray-400);
}

.chat-count {
    background: var(--primary-500);
    color: var(--white);
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: var(--radius-full);
}

/* Chat View */
.chat-view,
.document-view {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - var(--space-xl) * 2);
}

.chat-view.hidden,
.document-view.hidden {
    display: none;
}

.chat-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    margin-bottom: var(--space-md);
}

.chat-info {
    flex: 1;
}

.chat-info h3 {
    font-weight: 600;
    color: var(--gray-800);
}

.chat-problem,
.document-status {
    font-size: 0.8rem;
    color: var(--gray-500);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.message {
    max-width: 80%;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    animation: slideUp var(--transition-base);
}

.message.user {
    align-self: flex-end;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: var(--white);
    border-bottom-right-radius: var(--radius-sm);
}

.message.assistant {
    align-self: flex-start;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-bottom-left-radius: var(--radius-sm);
}

.message-content {
    line-height: 1.6;
}

.message-sources {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    font-size: 0.8rem;
    color: var(--gray-500);
}

.message.assistant .message-sources {
    color: var(--gray-400);
}

.chat-input-area {
    padding: var(--space-md) var(--space-lg);
    margin-top: auto;
}

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

.input-wrapper textarea {
    flex: 1;
    resize: none;
    min-height: 48px;
    max-height: 150px;
}

.send-btn {
    width: 48px;
    height: 48px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

/* Document Actions */
.document-actions {
    padding: var(--space-lg);
    margin-top: auto;
}

.action-buttons {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.action-buttons .btn {
    flex: 1;
}

/* ============================================
   Empty States
   ============================================ */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    text-align: center;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    opacity: 0.5;
}

.empty-state p {
    color: var(--gray-600);
    margin-bottom: var(--space-xs);
}

.empty-state .hint {
    font-size: 0.875rem;
    color: var(--gray-400);
}

/* ============================================
   Admin Section
   ============================================ */

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

.stats-card {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-xl);
}

.stat-icon {
    font-size: 2rem;
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary-100), var(--primary-200));
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-800);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.admin-panel {
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
}

.admin-panel h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: var(--space-lg);
}

.qdrant-stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.collection-stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md);
    background: rgba(0, 115, 230, 0.05);
    border-radius: var(--radius-sm);
}

.collection-name {
    font-family: monospace;
    color: var(--gray-700);
}

.collection-count {
    font-weight: 600;
    color: var(--primary-600);
}

.admin-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.users-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.user-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: rgba(0, 115, 230, 0.03);
    border-radius: var(--radius-sm);
}

.user-item .user-email {
    flex: 1;
    font-weight: 500;
}

.user-item .user-role-badge {
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.user-role-badge.dit {
    background: var(--primary-100);
    color: var(--primary-700);
}

.user-role-badge.ib {
    background: var(--warning-light);
    color: var(--warning);
}

.user-role-badge.general {
    background: var(--gray-100);
    color: var(--gray-600);
}

/* ============================================
   Modals
   ============================================ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
}

.modal.hidden {
    display: none;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 480px;
    padding: var(--space-xl);
    animation: scaleIn var(--transition-base);
}

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

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

.modal-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: flex-end;
    margin-top: var(--space-xl);
}

/* ============================================
   File Input & Drop Zone
   ============================================ */

.file-input-wrapper {
    position: relative;
}

.file-input-wrapper input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.file-input-display {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    cursor: pointer;
}

.file-icon {
    font-size: 1.2rem;
}

.file-name {
    color: var(--gray-500);
}

/* Drop Zone */
.drop-zone {
    position: relative;
    min-height: 160px;
    border: 2px dashed var(--glass-border);
    border-radius: var(--radius-lg);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    transition: all var(--transition-base);
    cursor: pointer;
    overflow: hidden;
}

.drop-zone:hover {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.05);
}

.drop-zone.drag-over {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.1);
    transform: scale(1.02);
}

.drop-zone-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 10;
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
    text-align: center;
    pointer-events: none;
}

.drop-zone-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    opacity: 0.7;
}

.drop-zone-text {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: var(--space-xs);
}

.drop-zone-hint {
    font-size: 0.9rem;
    color: var(--gray-500);
    margin-bottom: var(--space-sm);
}

.drop-zone-formats {
    font-size: 0.8rem;
    color: var(--gray-400);
    padding: var(--space-xs) var(--space-sm);
    background: var(--glass-bg);
    border-radius: var(--radius-sm);
}

.drop-zone-file {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    padding: var(--space-xl);
    min-height: 160px;
}

.drop-zone-file .file-icon {
    font-size: 2rem;
}

.drop-zone-file .file-name {
    font-size: 1rem;
    font-weight: 500;
    color: var(--gray-700);
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.drop-zone-file .file-remove {
    color: var(--danger);
    font-size: 1.2rem;
    padding: var(--space-xs);
}

.drop-zone-file .file-remove:hover {
    background: rgba(var(--danger-rgb, 220, 53, 69), 0.1);
}

/* ============================================
   Toast Notifications
   ============================================ */

.toast-container {
    position: fixed;
    top: var(--space-xl);
    right: var(--space-xl);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.toast {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    background: var(--white);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    animation: slideInRight var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    min-width: 280px;
}

.toast.success {
    border-left: 4px solid var(--success);
}

.toast.error {
    border-left: 4px solid var(--danger);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

.toast-icon {
    font-size: 1.2rem;
}

.toast-message {
    flex: 1;
    font-size: 0.9rem;
}

/* ============================================
   Loading Overlay
   ============================================ */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(4px);
    z-index: 3000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-overlay.hidden {
    display: none;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* ============================================
   Utility Classes
   ============================================ */

.hidden {
    display: none !important;
}

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

.text-muted {
    color: var(--gray-500);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    :root {
        --nav-width: 80px;
    }
    
    .nav-label {
        display: none;
    }
    
    .nav-item {
        justify-content: center;
    }
    
    .logo-text {
        display: none;
    }
    
    .user-details {
        display: none;
    }
}

@media (max-width: 768px) {
    :root {
        --nav-width: 0;
    }
    
    .nav-panel {
        display: none;
    }
    
    .main-content {
        margin-left: 0;
        padding: var(--space-md);
    }
    
    .message {
        max-width: 90%;
    }
}