/**
 * Insight 360 - Main Stylesheet
 * Version: 2.2.1
 * Apple-inspired design with dark/light theme support
 */

/* ============================================
   CSS VARIABLES & THEMING
   ============================================ */

:root {
    /* Color Palette */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    
    /* Phase Colors */
    --phase3: #f59e0b;
    --phase4: #8b5cf6;
    
    /* Typography */
    --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Orbitron', 'Source Sans 3', sans-serif;
    --font-mono: 'Fira Code', 'SF Mono', Monaco, 'Cascadia Code', monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Layout */
    --sidebar-width: 260px;
    --header-height: 64px;
}

/* Dark Theme (Default) */
:root {
    --bg-primary: #0f0f1a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #252540;
    --bg-code: #0d0d14;
    --bg-hover: rgba(99, 102, 241, 0.1);

    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b80;

    --border: #2a2a40;
    --border-light: #3a3a55;

    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-phase3: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
}

/* Light Theme */
html[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-code: #f1f3f4;
    --bg-hover: rgba(99, 102, 241, 0.08);
    
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a5a;
    --text-muted: #6b6b80;
    
    --border: #dee2e6;
    --border-light: #e9ecef;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-light);
}

img {
    max-width: 100%;
    height: auto;
}

button {
    font-family: inherit;
    cursor: pointer;
}

input,
textarea,
select {
    font-family: inherit;
}

/* ============================================
   APP LAYOUT
   ============================================ */

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

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

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

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

.logo-image {
    width: 32px;
    height: 32px;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-nav {
    padding: var(--spacing-md);
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: var(--spacing-xs);
    transition: all var(--transition-fast);
}

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

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

.nav-item.active:hover {
    background: var(--primary-dark);
}

.nav-item i {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-badge {
    font-size: 0.65rem;
    padding: 0.15rem 0.4rem;
    background: rgba(107, 107, 128, 0.3);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    margin-left: auto;
}

/* Navigation Sections */
.nav-section {
    margin-bottom: var(--spacing-sm);
}

.nav-primary {
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border);
    margin-bottom: var(--spacing-sm);
}

/* Navigation Groups (Collapsible) */
.nav-group {
    margin-bottom: var(--spacing-xs);
}

.nav-group-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-group-header:hover {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

.nav-group-header .group-icon {
    width: 16px;
    height: 16px;
    opacity: 0.7;
}

.nav-group-header .group-label {
    flex: 1;
    text-align: left;
}

.nav-group-header .group-chevron {
    width: 14px;
    height: 14px;
    transition: transform var(--transition-fast);
}

.nav-group.collapsed .group-chevron {
    transform: rotate(-90deg);
}

.nav-group-items {
    overflow: hidden;
    max-height: 500px;
    transition: max-height 0.2s ease-out, opacity 0.2s ease-out;
    padding-left: var(--spacing-sm);
}

.nav-group.collapsed .nav-group-items {
    max-height: 0;
    opacity: 0;
    pointer-events: none;
}

.nav-group-items .nav-item {
    font-size: 0.9rem;
    padding: var(--spacing-xs) var(--spacing-md);
}

/* Sidebar Footer */
.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border);
    margin-top: auto;
}

.sidebar-footer .nav-item {
    margin-bottom: 0;
}

.sidebar-footer .theme-toggle {
    width: 100%;
    justify-content: flex-start;
    background: transparent;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
}

.sidebar-section {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border);
}

.sidebar-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sidebar-footer {
    margin-top: auto;
    padding: var(--spacing-md);
    border-top: 1px solid var(--border);
}

/* User Profile in Sidebar */
.user-profile {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    margin-bottom: var(--spacing-sm);
}

.user-profile .user-avatar {
    width: 36px;
    height: 36px;
    min-width: 36px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 600;
    color: white;
}

.user-profile .user-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.user-profile .user-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-profile .user-role {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: capitalize;
}

.user-profile .user-role.admin {
    color: var(--warning);
}

.user-profile .user-role.viewer {
    color: var(--text-secondary);
}

.user-menu-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

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

.user-menu-btn i {
    width: 18px;
    height: 18px;
}

.sidebar-footer {
    position: relative;
}

.user-menu {
    display: none;
    flex-direction: column;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    overflow: hidden;
    position: absolute;
    bottom: 100%;
    left: var(--spacing-md);
    right: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border);
    z-index: 100;
}

.user-menu.open {
    display: flex;
}

.user-menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    background: transparent;
    border: none;
    cursor: pointer;
    width: 100%;
    text-align: left;
    transition: all var(--transition-base);
}

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

.user-menu-item.hidden {
    display: none;
}

.user-menu-item.logout {
    color: var(--danger);
    border-top: 1px solid var(--border);
}

.user-menu-item.logout:hover {
    background: rgba(239, 68, 68, 0.1);
}

.user-menu-item i {
    width: 16px;
    height: 16px;
}

.user-login-link {
    margin-bottom: var(--spacing-sm);
}

.version-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.version-number {
    font-family: var(--font-heading);
    color: var(--primary);
}

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

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

.page-header {
    padding: var(--spacing-xl);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-content h1 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.header-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

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

/* ============================================
   THEME TOGGLE
   ============================================ */

.theme-toggle-wrapper {
    display: flex;
    align-items: center;
}

.theme-toggle {
    position: relative;
    display: inline-block;
    width: 56px;
    height: 28px;
    cursor: pointer;
}

.theme-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 6px;
}

.theme-toggle-slider::before {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    left: 2px;
    bottom: 2px;
    background: var(--primary);
    border-radius: 50%;
    transition: var(--transition-base);
}

.theme-toggle input:checked + .theme-toggle-slider::before {
    transform: translateX(28px);
}

.theme-toggle-icon {
    font-size: 12px;
    z-index: 1;
}

.theme-toggle-icon.moon {
    margin-left: 2px;
}

.theme-toggle-icon.sun {
    margin-right: 2px;
}

/* ============================================
   CARDS & DASHBOARD
   ============================================ */

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
}

.dashboard-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.card-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.card-content {
    padding: var(--spacing-lg);
}

.card-icon {
    width: 18px;
    height: 18px;
    color: var(--primary);
}

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

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-danger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.btn-icon i {
    width: 18px;
    height: 18px;
}

/* ============================================
   STATUS BADGES
   ============================================ */

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 500;
}

.status-badge.status-online,
.status-badge.status-success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
}

.status-badge.status-offline,
.status-badge.status-error {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

.status-badge.status-loading,
.status-badge.status-pending {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

.count-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    padding: 0 0.5rem;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

/* ============================================
   QUICK ACTIONS
   ============================================ */

.quick-action-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.action-tile {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

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

.action-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.action-icon i {
    width: 20px;
    height: 20px;
    color: var(--primary);
}

/* ============================================
   MODEL LIST
   ============================================ */

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

.model-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.model-name {
    font-weight: 500;
    color: var(--text-primary);
}

.model-provider {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.no-models {
    color: var(--text-muted);
    text-align: center;
    padding: var(--spacing-lg);
}

/* ============================================
   SERVICE STATUS
   ============================================ */

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

.service-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.service-name {
    font-weight: 500;
}

.service-status {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.85rem;
}

.service-status.online {
    color: var(--success);
}

.service-status.offline {
    color: var(--danger);
}

.service-status.loading {
    color: var(--warning);
}

/* ============================================
   CHAT INTERFACE
   ============================================ */

.chat-header {
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.chat-header-left h1 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
}

.model-badge {
    padding: 0.25rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

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

.model-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

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

.select-model {
    padding: 0.4rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.85rem;
}

.chat-options {
    display: flex;
    gap: var(--spacing-sm);
}

.toggle-option {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toggle-option:has(input:checked) {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.toggle-option input {
    display: none;
}

.toggle-option i {
    width: 16px;
    height: 16px;
}

/* Chat Messages */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
}

.welcome-message {
    text-align: center;
    padding: var(--spacing-2xl);
    max-width: 600px;
    margin: auto;
}

.welcome-icon {
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
}

.welcome-icon i {
    width: 32px;
    height: 32px;
    color: white;
}

.welcome-icon .welcome-higgins {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.welcome-message h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.welcome-message p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.quick-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
}

.quick-action {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.quick-action i {
    width: 16px;
    height: 16px;
}

/* Chat Input */
.chat-input-container {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

.chat-input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: var(--spacing-sm);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
}

.input-actions-left,
.input-actions-right {
    display: flex;
    gap: var(--spacing-xs);
}

.chat-input-wrapper textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 0.95rem;
    resize: none;
    padding: 0.5rem;
    max-height: 150px;
}

.chat-input-wrapper textarea:focus {
    outline: none;
}

.chat-input-footer {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-sm);
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* File Preview */
.file-preview {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.file-preview.hidden {
    display: none;
}

/* ============================================
   MODALS
   ============================================ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal.active,
.modal:not(.hidden) {
    opacity: 1;
    visibility: visible;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 600px;
    max-height: 85vh;
    min-width: 320px;
    min-height: 200px;
    overflow: hidden;
    resize: both;
    position: relative;
}

/* Large modal variant */
.modal-content.modal-lg {
    max-width: 800px;
}

.modal-content.modal-xl {
    max-width: 1000px;
    width: 95%;
}

/* Resize handle indicator */
.modal-content::after {
    content: '';
    position: absolute;
    right: 4px;
    bottom: 4px;
    width: 12px;
    height: 12px;
    background: linear-gradient(135deg, transparent 50%, var(--text-muted) 50%, var(--text-muted) 60%, transparent 60%, transparent 70%, var(--text-muted) 70%, var(--text-muted) 80%, transparent 80%);
    opacity: 0.5;
    pointer-events: none;
    border-radius: 0 0 var(--radius-md) 0;
}

.modal-content:hover::after {
    opacity: 0.8;
}

/* Voice Modal */
.voice-modal {
    padding: var(--spacing-2xl);
    text-align: center;
}

.voice-recording {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.voice-animation {
    display: flex;
    gap: var(--spacing-sm);
}

.voice-circle {
    width: 20px;
    height: 20px;
    background: var(--primary);
    border-radius: 50%;
    animation: pulse 1.4s ease-in-out infinite;
}

.voice-circle:nth-child(2) {
    animation-delay: 0.2s;
}

.voice-circle:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.3);
        opacity: 0.7;
    }
}

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

/* Voice Playback */
.voice-playback {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.voice-playback.hidden {
    display: none;
}

.select-voice {
    padding: 0.4rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.85rem;
}

/* ============================================
   CONVERSATION LIST
   ============================================ */

.conversation-list {
    max-height: 300px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.conversation-item {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

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

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

.conversation-item.active {
    background: var(--bg-hover);
    border-left: 2px solid var(--primary);
}

.conversation-title {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.conversation-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.conversation-delete {
    opacity: 0;
    background: none;
    border: none;
    padding: 2px;
    cursor: pointer;
    color: var(--text-muted);
    transition: all var(--transition-fast);
    border-radius: 4px;
}

.conversation-delete:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

.conversation-delete i {
    width: 14px;
    height: 14px;
}

.empty-conversations {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ============================================
   UTILITIES
   ============================================ */

.hidden {
    display: none !important;
}

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

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

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

.text-success {
    color: var(--success);
}

.text-warning {
    color: var(--warning);
}

.text-danger {
    color: var(--danger);
}

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

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-base);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
}

@media (max-width: 768px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .chat-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }
    
    .chat-header-right {
        width: 100%;
        flex-wrap: wrap;
    }
    
    .page-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }
}

/* ============================================
   CONTEXT ASSETS (Phase 3)
   ============================================ */

.context-layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
    height: calc(100vh - 120px);
    overflow: hidden;
}

/* Asset List Panel */
.asset-list-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border);
    background: var(--bg-tertiary);
}

.panel-header h3 {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    color: var(--text-primary);
    margin: 0 0 var(--spacing-sm) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.panel-header h3 i {
    width: 18px;
    height: 18px;
    color: var(--primary);
}

.panel-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    transition: all var(--transition-fast);
}

.btn-sm:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.btn-sm i {
    width: 14px;
    height: 14px;
}

/* Search & Filters */
.search-filters {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.search-input-wrapper {
    position: relative;
    margin-bottom: var(--spacing-sm);
}

.search-input-wrapper i {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 0.6rem 0.75rem 0.6rem 2.25rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.85rem;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
}

.search-input::placeholder {
    color: var(--text-muted);
}

.filter-row {
    display: flex;
    gap: var(--spacing-xs);
}

.filter-select {
    flex: 1;
    padding: 0.4rem 0.6rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary);
}

/* Asset List */
.asset-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.asset-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
    margin-bottom: var(--spacing-xs);
    border: 1px solid transparent;
}

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

.asset-item.selected {
    background: rgba(99, 102, 241, 0.15);
    border-color: var(--primary);
}

.asset-icon {
    font-size: 1.25rem;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.asset-info {
    flex: 1;
    min-width: 0;
}

.asset-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 0.1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.asset-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.asset-version {
    background: var(--bg-tertiary);
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
}

/* Editor Panel */
.editor-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.editor-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    background: var(--bg-tertiary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

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

.editor-title h2 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    margin: 0;
    color: var(--text-primary);
}

.version-badge {
    background: rgba(245, 158, 11, 0.2);
    color: #f59e0b;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-family: var(--font-mono);
}

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

/* Editor Form */
.editor-form {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
}

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

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.form-input {
    width: 100%;
    padding: 0.65rem 0.85rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-textarea {
    min-height: 80px;
    resize: vertical;
    font-family: var(--font-body);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

/* Tags */
.tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    min-height: 42px;
    align-items: center;
}

.tag {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.25rem 0.5rem;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
}

.tag button {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    font-size: 1rem;
}

.tag button:hover {
    opacity: 0.8;
}

.tags-input {
    flex: 1;
    min-width: 100px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    outline: none;
    font-size: 0.85rem;
}

.tags-input::placeholder {
    color: var(--text-muted);
}

/* JSON Editor */
.json-editor-container {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.json-editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border);
}

.json-editor-header span {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.json-editor-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
}

.json-editor-status i {
    width: 14px;
    height: 14px;
}

.json-editor-status.valid {
    color: var(--success);
}

.json-editor-status.invalid {
    color: var(--danger);
}

.json-editor {
    width: 100%;
    min-height: 350px;
    padding: var(--spacing-md);
    background: var(--bg-code);
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    resize: vertical;
}

.json-editor:focus {
    outline: none;
}

/* Editor Footer */
.editor-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border);
    background: var(--bg-tertiary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.editor-stats {
    display: flex;
    gap: var(--spacing-lg);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.editor-stats span {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.editor-stats i {
    width: 14px;
    height: 14px;
}

/* Asset Type Grid (Modal) */
.asset-type-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.asset-type-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.asset-type-option:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
}

.asset-type-option.selected {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.15);
}

.asset-type-option .icon {
    font-size: 1.5rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
}

.asset-type-option .info h4 {
    font-size: 0.9rem;
    margin: 0 0 0.15rem 0;
    color: var(--text-primary);
}

.asset-type-option .info p {
    font-size: 0.75rem;
    margin: 0;
    color: var(--text-muted);
}

/* Context Assets Responsive */
@media (max-width: 1024px) {
    .context-layout {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr;
        height: auto;
    }

    .asset-list-panel {
        max-height: 300px;
    }
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }

    .asset-type-grid {
        grid-template-columns: 1fr;
    }

    .editor-header {
        flex-direction: column;
        align-items: flex-start;
    }
}