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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 0;
    box-shadow: var(--shadow-lg);
}

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

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.header h1 i {
    margin-right: 1rem;
}

.subtitle {
    font-size: 1.125rem;
    opacity: 0.95;
    font-weight: 300;
}

/* Main Content */
.main-content {
    padding: 2rem 0;
}

/* Controls Section */
.controls-section {
    margin-bottom: 2rem;
}

.control-card {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.control-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.control-card h3 i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    align-items: end;
}

.control-group {
    display: flex;
    flex-direction: column;
}

.control-group label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.control-group input,
.control-group select {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.control-group input:focus,
.control-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn {
    padding: 0.875rem 2rem;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(37, 99, 235, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Loading */
.loading {
    text-align: center;
    padding: 3rem;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.loading i {
    margin-right: 0.5rem;
    font-size: 1.5rem;
}

.hidden {
    display: none !important;
}

/* Metrics Section */
.metrics-section {
    margin-bottom: 2rem;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.metric-card {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.metric-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.metric-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.75rem;
    flex-shrink: 0;
}

.metric-content {
    flex: 1;
}

.metric-label {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.metric-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-dark);
}

/* Chart Section */
.chart-section {
    margin-bottom: 2rem;
}

.chart-card {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.chart-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.chart-card h3 i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

#forecast-chart {
    width: 100% !important;
    height: 400px !important;
}

/* Insights Section */
.insights-section {
    margin-bottom: 2rem;
}

.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
}

.insight-card {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
}

.insight-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.insight-card h3 i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

.insight-item {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.insight-item:last-child {
    border-bottom: none;
}

.insight-item strong {
    color: var(--text-dark);
}

.insight-item span {
    color: var(--text-light);
}

/* About Section */
.about-section {
    margin-bottom: 2rem;
}

.about-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    color: white;
}

.about-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.about-card h3 i {
    margin-right: 0.5rem;
}

.about-card p {
    margin-bottom: 1rem;
    line-height: 1.8;
    opacity: 0.95;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.tech-badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
}

.tech-badge i {
    margin-right: 0.5rem;
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: var(--bg-light);
    padding: 2rem 0;
    text-align: center;
    margin-top: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.75rem;
    }

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

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

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

    .chart-card {
        padding: 1rem;
    }

    #forecast-chart {
        height: 300px !important;
    }
}