:root {
    --primary: #2c3e50;
    --primary-dark: #1a252f;
    --accent: #3498db;
    --accent-hover: #2980b9;
    --text-dark: #2c3e50;
    --text-medium: #555;
    --text-light: #777;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --border: #e5e5e5;
    --shadow: rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-padding-top: 11rem;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-dark);
    background: var(--bg-white);
    line-height: 1.8;
    font-size: 1.1rem;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: var(--bg-white);
    z-index: 1000;
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

.nav-logo {
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: #000000;
    text-decoration: none;
}

.nav-logo:hover {
    color: #333333;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0;
}

.nav-link {
    color: #333333;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    padding: 1.1rem 1.25rem;
    display: block;
    transition: all 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #000000;
    background: #f5f5f5;
}

.nav-link-stacked {
    line-height: 1.25;
    font-size: 0.88rem;
    padding: 0.65rem 0.85rem;
}

/* Hero Section */
.hero {
    padding: 6rem 0 3rem 0;
    background: var(--bg-white);
}

.hero-centered {
    text-align: center;
    max-width: 1000px;
    margin: 0 auto 3rem;
}

.hero-location {
    font-size: 0.95rem;
    color: var(--text-light);
    letter-spacing: 0.03em;
    margin-bottom: 0.5rem;
}

.hero-logo {
    margin-bottom: 1.5rem;
}

.hero-logo img {
    max-width: 350px;
    width: 100%;
    height: auto;
}

.hero-tagline {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-medium);
    margin-bottom: 1.5rem;
    white-space: nowrap;
}

.hero-cta {
    display: flex;
    flex-wrap: nowrap;
    gap: 1rem;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.hero-cta .btn {
    flex-shrink: 0;
    white-space: nowrap;
}

.hero-about {
    max-width: 720px;
    margin: 0 auto;
}

.hero-about p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-medium);
    margin-bottom: 1.5rem;
}

.about-column h3 {
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 1.5rem;
    font-weight: 600;
    color: #000000;
    margin-bottom: 0.75rem;
}

.about-column p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-medium);
}

.btn {
    padding: 0.6rem 1.25rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    display: inline-block;
}

.btn-primary {
    background: #000000;
    color: white;
}

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

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

.btn-secondary:hover {
    background: var(--bg-light);
    border-color: var(--text-medium);
}

/* Sections */
section {
    padding: 3rem 0;
}

.section-header {
    margin-bottom: 2rem;
    background: #ffffff;
}

.section-header h2 {
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 2rem;
    font-weight: 600;
    color: #000000;
    margin-bottom: 0.5rem;
}

.header-line {
    width: 50px;
    height: 3px;
    background: #000000;
}

/* Research Preview */
.research-preview {
    background: var(--bg-white);
}

.research-areas {
    max-width: 800px;
}

.research-item {
    padding: 0.75rem 0;
}

.research-item h3 {
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 1.35rem;
    font-weight: 600;
    color: #000000;
    margin-bottom: 0.25rem;
}

.research-item p {
    color: var(--text-medium);
    line-height: 1.8;
    font-size: 1.1rem;
}

.link-arrow {
    display: inline-block;
    color: #000000;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    margin-top: 1rem;
}

.link-arrow:hover {
    text-decoration: underline;
}

/* News Section */
.news {
    background: var(--bg-white);
}

.news-grid {
    max-width: 700px;
}

.news-item {
    padding: 0.75rem 0;
}

.news-date {
    color: #000000;
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
}

.news-item h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #000000;
    margin-bottom: 0.25rem;
}

.news-item p {
    color: var(--text-medium);
    line-height: 1.8;
    font-size: 1.1rem;
}

/* Site Address */
.site-address {
    padding: 2rem 0 3rem;
    text-align: center;
    border-top: 1px solid var(--border);
    margin-top: 2rem;
}

.site-address p {
    color: var(--text-medium);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0.25rem 0;
}

/* Page Hero (for subpages) */
.page-hero {
    margin-top: 60px;
    padding: 2.5rem 0;
    background: #ffffff;
    color: #000000;
}

.page-hero h1 {
    font-family: 'Crimson Pro', Georgia, serif;
    font-size: 2.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.page-hero p {
    font-size: 1rem;
    opacity: 0.85;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        height: auto;
        padding: 0.75rem 1rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0;
    }
    
    .nav-link {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }
    
    main {
        padding-top: 11rem;
    }
    
    main > section:first-child,
    main > .tools-resources:first-child {
        padding-top: 0 !important;
    }
    
    .hero,
    .team-section,
    .contact-section,
    .publications-section {
        padding-top: 0 !important;
    }
    
    .banner {
        margin-top: 11rem;
    }
    
    .hero-logo img {
        max-width: 280px;
    }
    
    .hero-tagline {
        font-size: 1rem;
        white-space: normal;
    }
    
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .section-header h2 {
        font-size: 1.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .page-hero {
        margin-top: 11rem;
    }
    
    .page-hero h1 {
        font-size: 1.75rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    section {
        padding: 2rem 0;
    }
    
    .hero-logo img {
        max-width: 220px;
    }
    
    .hero-tagline {
        font-size: 1rem;
    }
    
    .about-column h3 {
        font-size: 1.2rem;
    }
}