/* University of Arkansas colors: Cardinal Red #C92C2C, Navy Blue #14213D */
:root {
    --primary-color: #C92C2C;
    --secondary-color: #14213D;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --white: #ffffff;
    --border-color: #dee2e6;
}

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

body {
    font-family: 'Open Sans', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

h1, h2, h3, h4 {
    font-family: 'Merriweather', serif;
    color: var(--secondary-color);
}

a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Navigation */
.site-header {
    background: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-color);
}

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

.nav-menu a {
    color: var(--text-color);
    font-weight: 600;
}

.nav-menu a.active {
    color: var(--primary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--secondary-color);
    border-radius: 2px;
}

/* Hero Section */
.hero {
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.hero-content .title {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.hero-content .institution {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-weight: 600;
    display: inline-block;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
    border: 2px solid var(--primary-color);
}

.btn-primary:hover {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
    text-decoration: none;
}

.btn-secondary {
    background: var(--white);
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    text-decoration: none;
}

.btn-outline {
    background: var(--white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--white);
    text-decoration: none;
}

.profile-photo {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

/* Sections */
section {
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 2rem;
}

h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.about {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 8px;
}

.about p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Publications */
.publication-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.publication-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.publication-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.publication-card .authors {
    font-size: 0.95rem;
    color: #666;
    margin-bottom: 0.25rem;
}

.publication-card .journal {
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1rem;
}

.link {
    display: inline-block;
    margin-right: 1rem;
    font-size: 0.9rem;
    font-weight: 600;
}

.section-link {
    text-align: center;
    margin-top: 2rem;
}

/* Teaching */
.course-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.course-item {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.course-item h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--secondary-color);
}

.course-item p {
    color: #666;
}

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

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

.footer-section h4 {
    color: var(--white);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--white);
    opacity: 0.9;
}

.footer-section a:hover {
    opacity: 1;
    text-decoration: underline;
}

.footer-bottom {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        padding: 1rem;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    section {
        padding: 0 1rem;
    }
}



.email-btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 4px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.email-btn:hover {
    background: var(--secondary-color);
    color: var(--white);
    text-decoration: none;
}

/* Print styles */
@media print {
    .site-header, .site-footer, .hero-actions, .section-link {
        display: none;
    }

    .hero {
        margin: 1rem 0;
    }

    .profile-photo {
        max-width: 200px;
    }

    section {
        margin: 1rem 0;
    }
}