/* ================================================
   Modern AI Research Website - Clean Design
   Based on Reference Screenshot
   ================================================ */

/* === CSS Variables === */
:root {
    /* Colors - Light Theme */
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;
    --color-secondary: #a78bfa;
    --color-accent: #c084fc;
    
    --color-text-primary: #1e1b4b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-gradient-start: #ffffff;
    --color-bg-gradient-end: #f5f3ff;
    
    --color-border: #e2e8f0;
    --color-shadow: rgba(0, 0, 0, 0.06);
    --color-shadow-hover: rgba(99, 102, 241, 0.15);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    --font-size-hero: 3.5rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Dark Theme */
body.dark-theme {
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
    
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-gradient-start: #0f172a;
    --color-bg-gradient-end: #1e1b4b;
    
    --color-border: #334155;
    --color-shadow: rgba(0, 0, 0, 0.3);
}

/* === Reset & Base Styles === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family);
    color: var(--color-text-primary);
    background: linear-gradient(180deg, var(--color-bg-gradient-start) 0%, var(--color-bg-gradient-end) 100%);
    background-attachment: fixed;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* === Navigation === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

body.dark-theme .navbar {
    background: rgba(15, 23, 42, 0.8);
}

.navbar.scrolled {
    box-shadow: 0 4px 12px var(--color-shadow);
}

.navbar-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
}

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

.navbar-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-base);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: width var(--transition-base);
}

.nav-link:hover::after {
    width: 100%;
}

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

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

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

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--color-text-secondary);
}

/* === Hero Section === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-3xl) 0;
    padding-top: calc(70px + var(--spacing-3xl));
}

.hero-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    text-align: center;
}

.breadcrumb {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    background: var(--color-bg-secondary);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.breadcrumb:hover {
    color: var(--color-primary);
}

.hero-title {
    font-size: var(--font-size-hero);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.hero-title .line {
    display: block;
}

.gradient-text {
    background: linear-gradient(135deg, #6366f1 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.6;
}

/* === Metrics Cards === */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.metric-card {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: 0 4px 12px var(--color-shadow);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    transition: all var(--transition-base);
    border: 1px solid var(--color-border);
}

.metric-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow-hover);
}

.metric-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.metric-content {
    text-align: left;
    flex: 1;
}

.metric-value {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-text-primary);
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.metric-value::after {
    content: '+';
    font-size: var(--font-size-lg);
    margin-left: 2px;
    opacity: 0.6;
}

.metric-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.4;
}

/* === Buttons === */
.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
}

/* === Sections === */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-alt {
    background: rgba(255, 255, 255, 0.5);
}

body.dark-theme .section-alt {
    background: rgba(30, 41, 59, 0.3);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* === Info Cards === */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.info-card {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: 0 4px 12px var(--color-shadow);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow-hover);
}

.info-card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(167, 139, 250, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.info-card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.info-card-text {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.info-card-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.info-card-list li {
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.info-card-list li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

/* === Leaders Grid === */
.leaders-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.leader-card {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: 0 4px 12px var(--color-shadow);
    border: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
}

.leader-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow-hover);
}

.leader-rank {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: var(--font-size-xl);
}

.leader-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    padding-right: 60px;
}

.leader-stats {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.leader-stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
}

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

.leader-stat-value {
    font-weight: 700;
    color: var(--color-primary);
}

.leader-highlights {
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-md);
}

.leader-highlights h4 {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.leader-highlights ul {
    list-style: none;
    padding: 0;
}

.leader-highlights li {
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
}

.leader-highlights li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

/* === Analytics === */
.analytics-controls {
    margin-bottom: var(--spacing-xl);
    display: flex;
    justify-content: center;
}

.metric-selector {
    display: flex;
    gap: var(--spacing-sm);
    background: var(--color-bg-primary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--color-shadow);
    flex-wrap: wrap;
    justify-content: center;
}

.metric-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    background: none;
    color: var(--color-text-secondary);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
}

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

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

.charts-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.chart-wrapper {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: 0 4px 12px var(--color-shadow);
    border: 1px solid var(--color-border);
}

.chart-full {
    grid-column: 1 / -1;
}

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

.chart-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-primary);
}

.chart-download {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.chart-download:hover {
    background: var(--color-bg-secondary);
    color: var(--color-primary);
}

/* === Regions === */
.regions-controls {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.search-box {
    flex: 1;
    min-width: 250px;
    position: relative;
}

.search-box i {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
}

.search-box input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) calc(var(--spacing-md) * 3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
}

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

.sort-box select {
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.regions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.region-card {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: 0 4px 12px var(--color-shadow);
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: all var(--transition-base);
}

.region-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow-hover);
}

.region-header {
    margin-bottom: var(--spacing-md);
}

.region-name {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.region-budget {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.region-detail {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

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

.region-detail-value {
    font-weight: 600;
    color: var(--color-text-primary);
}

/* === Timeline === */
.timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-2xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.timeline-marker {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    background: var(--color-bg-primary);
    border: 3px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    position: relative;
    z-index: 10;
    flex-shrink: 0;
    margin: 0 auto;
}

.timeline-item.active .timeline-marker {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(167, 139, 250, 0.1));
}

.timeline-item.future .timeline-marker {
    background: var(--color-bg-secondary);
}

.timeline-content {
    flex: 1;
    background: var(--color-bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: 0 4px 12px var(--color-shadow);
    border: 1px solid var(--color-border);
}

.timeline-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.timeline-text {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* === Footer === */
.footer {
    background: var(--color-bg-secondary);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

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

.footer-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.footer-text {
    color: var(--color-text-secondary);
    line-height: 1.6;
    font-size: var(--font-size-sm);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--color-bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* === AI Assistant === */
.ai-float-button {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 64px;
    height: 64px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
    transition: all var(--transition-base);
    z-index: 999;
}

.ai-float-button:hover {
    transform: scale(1.1);
    box-shadow: 0 12px 32px rgba(99, 102, 241, 0.5);
}

.ai-assistant-modal {
    position: fixed;
    bottom: calc(var(--spacing-xl) + 80px);
    right: var(--spacing-xl);
    width: 400px;
    max-width: calc(100vw - var(--spacing-xl) * 2);
    height: 600px;
    max-height: calc(100vh - 180px);
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: 0 12px 48px var(--color-shadow);
    border: 1px solid var(--color-border);
    display: none;
    flex-direction: column;
    z-index: 998;
    overflow: hidden;
}

.ai-assistant-modal.active {
    display: flex;
    animation: slideUp 0.3s ease;
}

.ai-assistant-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

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

.ai-assistant-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05), rgba(167, 139, 250, 0.05));
    flex-shrink: 0;
}

.ai-assistant-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    color: var(--color-text-primary);
}

.ai-assistant-title i {
    color: var(--color-primary);
}

.ai-assistant-close {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

.ai-assistant-body {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    min-height: 0;
    max-height: 100%;
}

/* Custom scrollbar for AI assistant */
.ai-assistant-body::-webkit-scrollbar {
    width: 8px;
}

.ai-assistant-body::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
}

.ai-assistant-body::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: var(--radius-md);
}

.ai-assistant-body::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}

.ai-message {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    animation: fadeIn 0.3s ease;
    width: 100%;
}

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

.ai-message-content {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    max-width: 100%;
    width: 100%;
    line-height: 1.6;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* AI message content formatting */
.ai-message-content h1,
.ai-message-content h2,
.ai-message-content h3 {
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.ai-message-content h1:first-child,
.ai-message-content h2:first-child,
.ai-message-content h3:first-child {
    margin-top: 0;
}

.ai-message-content ul,
.ai-message-content ol {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.ai-message-content li {
    margin-bottom: var(--spacing-xs);
}

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

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

.ai-message-assistant {
    align-items: flex-start;
}

.ai-message-user {
    align-items: flex-end;
}

.ai-message-assistant .ai-message-content {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(167, 139, 250, 0.1));
    color: var(--color-text-primary);
    width: 100%;
    max-width: 100%;
}

.ai-message-user .ai-message-content {
    background: var(--color-primary);
    color: white;
    max-width: 85%;
    width: auto;
    align-self: flex-end;
}

.ai-examples {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.ai-example {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.ai-example:hover {
    background: var(--color-primary);
    color: white;
}

.ai-assistant-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.ai-assistant-footer input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
}

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

.ai-assistant-footer button {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.ai-assistant-footer button:hover {
    transform: scale(1.05);
}

/* === Index Status === */
.index-status-container {
    margin: var(--spacing-md) 0;
}

.index-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 2px solid;
    animation: fadeIn 0.3s ease;
}

.index-status-success {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgb(16, 185, 129);
}

.index-status-warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgb(245, 158, 11);
}

.index-status-error {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgb(239, 68, 68);
}

.index-status-progress {
    background: rgba(99, 102, 241, 0.1);
    border-color: rgb(99, 102, 241);
}

.index-status-icon {
    font-size: var(--font-size-2xl);
    flex-shrink: 0;
}

.index-status-info {
    flex: 1;
}

.index-status-title {
    font-weight: 600;
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.index-status-details {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.index-create-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.index-create-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.index-create-btn .btn-icon {
    font-size: var(--font-size-lg);
}

/* Progress bar */
.index-progress-bar {
    margin-top: var(--spacing-sm);
    height: 8px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.index-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
    width: 0%;
}

/* Spinner */
.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-bg-secondary);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* === Modal === */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1001;
    padding: var(--spacing-lg);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: var(--spacing-2xl);
    position: relative;
}

.modal-close {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    color: var(--color-text-secondary);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

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

/* === Responsive === */
@media (max-width: 1024px) {
    .hero-title {
        font-size: var(--font-size-5xl);
    }
}

@media (max-width: 768px) {
    .navbar-menu {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero {
        padding-top: calc(70px + var(--spacing-xl));
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .metrics-grid {
        grid-template-columns: 1fr;
    }
    
    .charts-container {
        grid-template-columns: 1fr;
    }
    
    .timeline::before {
        left: 40px;
    }
    
    .timeline-item {
        flex-direction: row;
        align-items: flex-start;
    }
    
    .timeline-marker {
        margin: 0;
    }
    
    .ai-assistant-modal {
        width: calc(100vw - var(--spacing-lg) * 2);
        right: var(--spacing-lg);
        bottom: calc(var(--spacing-lg) + 70px);
        max-height: calc(100vh - 160px);
        height: auto;
    }
    
    .ai-float-button {
        bottom: var(--spacing-lg);
        right: var(--spacing-lg);
        width: 56px;
        height: 56px;
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .regions-grid {
        grid-template-columns: 1fr;
    }
    
    .ai-assistant-modal {
        width: calc(100vw - var(--spacing-sm) * 2);
        right: var(--spacing-sm);
        bottom: calc(var(--spacing-sm) + 66px);
        max-height: calc(100vh - 120px);
    }
    
    .ai-float-button {
        bottom: var(--spacing-sm);
        right: var(--spacing-sm);
        width: 50px;
        height: 50px;
        font-size: 1.125rem;
    }
    
    .ai-message-content {
        max-width: 90%;
    }
}

/* === Utility Classes === */
.hidden {
    display: none !important;
}

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

.mt-lg {
    margin-top: var(--spacing-lg);
}

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