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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8fafc;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e2e8f0;
    z-index: 1000;
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 1.2rem;
    color: #2563eb;
}

.nav-brand i {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #64748b;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #2563eb;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 3rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 3rem;
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

.cta-button {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    transition: background 0.3s ease;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.cta-button:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Sections */
.section {
    padding: 80px 0;
}

.section.alt-bg {
    background-color: white;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
    color: #1e293b;
}

/* Overview Grid */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.overview-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.overview-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.card-icon i {
    font-size: 1.5rem;
    color: white;
}

.overview-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1e293b;
}

.feature-list {
    list-style: none;
    margin-top: 1rem;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.feature-list i {
    color: #10b981;
    font-size: 0.8rem;
}

.feature-list .fa-minus {
    color: #ef4444;
}

/* Analysis Grid */
.analysis-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.chart-container {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

.chart-container h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #1e293b;
}

.chart-description {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: #64748b;
    font-style: italic;
}

.stats-panel {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

.stats-panel h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #1e293b;
}

.stat-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    text-align: center;
    padding: 1rem;
    background: #f8fafc;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2563eb;
    display: block;
}

.stat-desc {
    font-size: 0.8rem;
    color: #64748b;
    margin-top: 0.5rem;
}

.insight-box {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1rem;
}

.insight-box h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.insight-box p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Comparison Section */
.comparison-intro {
    text-align: center;
    margin-bottom: 3rem;
}

.comparison-intro p {
    font-size: 1.1rem;
    color: #64748b;
    max-width: 600px;
    margin: 0 auto;
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.comparison-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
    text-align: center;
}

.comparison-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #1e293b;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.comparison-stat {
    margin-bottom: 1rem;
}

.comparison-stat .stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: #2563eb;
    display: block;
}

.comparison-stat .stat-label {
    font-size: 0.9rem;
    color: #64748b;
}

.comparison-card p {
    font-size: 0.9rem;
    color: #64748b;
    line-height: 1.5;
}

/* Insights Section */
.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.insight-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

.insight-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.insight-header i {
    color: #2563eb;
    font-size: 1.2rem;
}

.insight-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #1e293b;
}

.correlation-matrix, .test-results, .extreme-events {
    margin-bottom: 1rem;
}

.correlation-item, .test-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: #f8fafc;
    border-radius: 6px;
    margin-bottom: 0.5rem;
}

.correlation-value {
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
}

.correlation-value.positive {
    background: #dcfce7;
    color: #166534;
}

.correlation-value.negative {
    background: #fee2e2;
    color: #991b1b;
}

.correlation-value.neutral {
    background: #f1f5f9;
    color: #475569;
}

.test-result {
    font-weight: 600;
    font-size: 0.8rem;
}

.test-result.significant {
    color: #10b981;
}

.test-conclusion {
    font-size: 0.8rem;
    color: #64748b;
}

.event-type {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    background: #f8fafc;
    border-radius: 6px;
    margin-bottom: 0.5rem;
}

.event-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: white;
}

.event-icon.hot {
    background: #ef4444;
}

.event-icon.cold {
    background: #3b82f6;
}

.event-icon.rain {
    background: #06b6d4;
}

.event-icon::before {
    content: '';
}

.event-icon.hot::before {
    content: '🔥';
}

.event-icon.cold::before {
    content: '❄️';
}

.event-icon.rain::before {
    content: '🌧️';
}

.event-title {
    font-weight: 600;
    color: #1e293b;
}

.event-count {
    font-size: 0.9rem;
    color: #64748b;
}

/* Conclusions Section */
.conclusions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.conclusion-category {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e2e8f0;
}

.conclusion-category h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #1e293b;
}

.conclusion-category h3 i {
    color: #2563eb;
}

.conclusion-list {
    list-style: none;
}

.conclusion-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid #f1f5f9;
    font-size: 0.9rem;
    line-height: 1.5;
    color: #4b5563;
}

.conclusion-list li:last-child {
    border-bottom: none;
}

/* Footer */
.footer {
    background: #1e293b;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    padding: 0.25rem 0;
    color: #94a3b8;
    font-size: 0.9rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #334155;
    color: #94a3b8;
    font-size: 0.9rem;
}

/* Chart Canvas Heights */
.chart-container canvas {
    height: 300px !important;
}

#correlationChart {
    height: 200px !important;
}

#seasonalChart {
    height: 400px !important;
}

.chart-container.large-chart {
    margin-top: 3rem;
}

.chart-container.seasonal-chart {
    margin-bottom: 3rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .analysis-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        display: none;
    }
    
    .container {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .overview-grid,
    .comparison-grid,
    .insights-grid,
    .conclusions-grid {
        grid-template-columns: 1fr;
    }
}