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

:root {
    --primary-color: #1a1a1a;
    --secondary-color: #2c2c2c;
    --accent-color: #0066cc;
    --text-color: #333333;
    --light-bg: #f5f5f5;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --success-color: #27ae60;
    --error-color: #e74c3c;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--text-color);
    background-color: var(--white);
    line-height: 1.6;
    font-size: 16px;
}

/* NAVBAR STYLES */
.navbar {
    background-color: var(--white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--accent-color);
}

/* COOKIE BANNER */
.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 1.5rem;
    z-index: 999;
    display: none;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.2);
}

.cookie-banner.show {
    display: block;
}

.cookie-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.cookie-content p {
    flex: 1;
    font-size: 0.9rem;
    line-height: 1.5;
}

.cookie-buttons {
    display: flex;
    gap: 1rem;
    white-space: nowrap;
}

.btn-primary, .btn-secondary {
    padding: 0.6rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    font-weight: 500;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--white);
}

.btn-primary:hover {
    background-color: #0052a3;
}

.btn-secondary {
    background-color: transparent;
    color: var(--white);
    border: 1px solid var(--white);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* MAIN CONTENT */
main {
    min-height: calc(100vh - 60px);
    background-color: var(--white);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* SECTIONS */
section {
    padding: 4rem 0;
}

h1, h2, h3, h4, h5, h6 {
    margin: 1.5rem 0 1rem 0;
    line-height: 1.3;
    font-weight: 600;
}

h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
}

h2 {
    font-size: 2rem;
    color: var(--primary-color);
}

h3 {
    font-size: 1.4rem;
    color: var(--primary-color);
}

h4 {
    font-size: 1.1rem;
    color: var(--primary-color);
}

p {
    margin-bottom: 1.2rem;
    line-height: 1.8;
    color: var(--text-color);
}

/* HERO SECTION */
.hero-section {
    background-color: var(--white);
    padding: 3rem 2rem 2rem 2rem;
}

.hero-container {
    max-width: 900px;
    margin: 0 auto;
}

.hero-section h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 3rem;
    line-height: 1.6;
}

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

.card-item {
    padding: 1.5rem;
    background-color: var(--light-bg);
    border-left: 3px solid var(--accent-color);
    line-height: 1.7;
}

.card-item h3 {
    margin-top: 0;
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
}

.card-item p {
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* INTRO SECTION */
.intro-section {
    background-color: var(--white);
}

.key-factors {
    list-style-position: inside;
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 4px;
    margin: 1.5rem 0;
}

.key-factors li {
    margin: 0.8rem 0;
    line-height: 1.6;
}

/* FEATURED RESEARCH */
.featured-research {
    background-color: var(--white);
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.research-item {
    padding: 2rem;
    background-color: var(--light-bg);
    border-top: 3px solid var(--accent-color);
    line-height: 1.8;
}

.research-item h3 {
    margin-top: 0;
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.research-item p {
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.read-more {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.read-more:hover {
    color: #0052a3;
    text-decoration: underline;
}

/* METHODOLOGY SECTION */
.methodology-list {
    margin: 1.5rem 0;
    margin-left: 2rem;
}

.methodology-list li {
    margin: 1rem 0;
    line-height: 1.8;
}

/* INSIGHTS SECTION */
.insights-section {
    background-color: var(--white);
}

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

.insight-card {
    padding: 1.5rem;
    background-color: var(--light-bg);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--accent-color);
}

.insight-card h4 {
    margin-top: 0;
    margin-bottom: 0.8rem;
}

.insight-card p {
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* LINKS AND BUTTONS */
a {
    color: var(--accent-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

button {
    font-family: inherit;
}

/* FOOTER */
.footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 3rem 2rem 1rem 2rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: var(--white);
    margin-top: 0;
    margin-bottom: 1rem;
}

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

.footer-section ul li {
    margin-bottom: 0.7rem;
}

.footer-section a {
    color: #aaa;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--white);
}

.footer-section p {
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 0.8rem;
    color: #aaa;
}

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 1.5rem;
    text-align: center;
    color: #aaa;
    font-size: 0.85rem;
}

/* RESPONSIVE DESIGN */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
        font-size: 0.85rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .research-cards {
        grid-template-columns: 1fr;
    }
    
    .cookie-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .cookie-content p {
        margin-bottom: 0;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    section {
        padding: 2rem 0;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 1rem;
    }
    
    .nav-links {
        gap: 0.5rem;
        font-size: 0.75rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    h2 {
        font-size: 1.2rem;
    }
    
    .hero-section {
        padding: 2rem 1rem;
    }
    
    .research-cards {
        gap: 1rem;
    }
    
    .card-item {
        padding: 1rem;
    }
    
    .insights-grid {
        grid-template-columns: 1fr;
    }
}