/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: 0.5em;
    font-weight: 700;
    line-height: 1.2;
    color: #1a1a1a;
}

p {
    margin-bottom: 1rem;
}

/* Header styles */
header {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header h1 {
    color: white;
    font-size: 1.8rem;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Navigation */
nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 1.5rem;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 0;
    transition: color 0.3s;
}

nav ul li a:hover, nav ul li a.active {
    color: #3498db;
}

/* Hero section */
.hero {
    background-color: #3498db;
    color: white;
    padding: 3rem 0;
    text-align: center;
}

.hero h2 {
    color: white;
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
}

/* Main content */
main {
    padding: 3rem 0;
}

section {
    margin-bottom: 3rem;
}

section h2 {
    margin-bottom: 1.5rem;
    color: #2c3e50;
    font-size: 2rem;
}

/* Cards */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background-color: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.1);
}

.card h3 {
    color: #3498db;
    margin-bottom: 1rem;
}

/* Buttons */
.buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.button {
    display: inline-block;
    background-color: #3498db;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s;
}

.button:hover {
    background-color: #2980b9;
}

/* CTA section */
.cta {
    background-color: #f1f5f9;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
}

/* Footer */
footer {
    background-color: #2c3e50;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

/* Responsive design */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        text-align: center;
    }
    
    nav ul {
        margin-top: 1rem;
        justify-content: center;
    }
    
    nav ul li {
        margin: 0 0.75rem;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .cards {
        grid-template-columns: 1fr;
    }
    
    .buttons {
        flex-direction: column;
    }
}

/* Page-specific styles */
.methodology-section, .results-section, .conclusions-section, .about-section {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.chart-container {
    background-color: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin: 2rem 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
}

table, th, td {
    border: 1px solid #ddd;
}

th, td {
    padding: 12px;
    text-align: left;
}

th {
    background-color: #f2f2f2;
    font-weight: bold;
}

tr:nth-child(even) {
    background-color: #f9f9f9;
}

tr:hover {
    background-color: #f1f1f1;
}