/* ==========================================================================
   Kolbe A. Dumas Academic Website
   A refined, professional academic aesthetic
   ========================================================================== */

/* CSS Custom Properties */
:root {
    --color-charcoal: #1a1a2e;
    --color-charcoal-light: #2d2d44;
    --color-burgundy: #722F37;
    --color-burgundy-light: #8b3a44;
    --color-cream: #faf9f7;
    --color-warm-white: #ffffff;
    --color-text: #2c2c2c;
    --color-text-muted: #5a5a5a;
    --color-border: #e8e6e3;
    
    --font-heading: 'Libre Baskerville', Georgia, serif;
    --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    --max-width: 900px;
    --transition: 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-cream);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-charcoal);
}

h1 {
    font-size: clamp(2.25rem, 5vw, 3rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    position: relative;
    display: inline-block;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 3px;
    background-color: var(--color-burgundy);
}

h3 {
    font-size: 1.15rem;
    font-weight: 400;
    font-style: italic;
}

p {
    margin-bottom: 1rem;
}

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

a:hover {
    color: var(--color-burgundy-light);
}

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xl) 0;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(250, 249, 247, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-charcoal);
}

.nav-logo:hover {
    color: var(--color-burgundy);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-burgundy);
    transition: width var(--transition);
}

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

.nav-links a:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 80px;
    background: linear-gradient(180deg, var(--color-cream) 0%, var(--color-warm-white) 100%);
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-md);
}

.hero-image {
    width: 220px;
    height: 220px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--color-warm-white);
    box-shadow: 
        0 4px 20px rgba(26, 26, 46, 0.1),
        0 0 0 1px var(--color-border);
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center top;
}

.hero-content h1 {
    margin-bottom: var(--spacing-xs);
}

.hero-title {
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--color-burgundy);
    margin-bottom: 0.25rem;
}

.hero-affiliation {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.hero-fields {
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--color-text-muted);
    letter-spacing: 0.02em;
}

/* About Section */
.about {
    background-color: var(--color-warm-white);
}

.about-content {
    margin-top: var(--spacing-md);
}

.about-content p {
    font-size: 1.05rem;
    max-width: 70ch;
}

.about-content p:last-child {
    margin-bottom: 0;
}

/* Research Section */
.research {
    background-color: var(--color-cream);
}

.section-subtitle {
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.papers {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.paper {
    padding: var(--spacing-md);
    background-color: var(--color-warm-white);
    border-left: 3px solid var(--color-burgundy);
    border-radius: 0 4px 4px 0;
    box-shadow: 0 2px 8px rgba(26, 26, 46, 0.04);
    transition: transform var(--transition), box-shadow var(--transition);
}

.paper:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 16px rgba(26, 26, 46, 0.08);
}

.paper h3 {
    color: var(--color-charcoal);
    margin-bottom: var(--spacing-sm);
    font-style: normal;
    font-weight: 700;
    font-size: 1.05rem;
    line-height: 1.5;
}

.paper-description {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 0;
    line-height: 1.65;
}

/* Education Section */
.education {
    background-color: var(--color-warm-white);
}

.education-items {
    margin-top: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.education-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.education-year {
    flex-shrink: 0;
    width: 120px;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-burgundy);
    padding-top: 2px;
}

.education-details h3 {
    font-style: normal;
    font-weight: 600;
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--color-charcoal);
    margin-bottom: 0.25rem;
}

.education-focus {
    font-size: 0.95rem;
    color: var(--color-text);
    margin-bottom: 0.15rem;
}

.education-school {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 0;
}

/* Contact Section */
.contact {
    background: linear-gradient(180deg, var(--color-cream) 0%, var(--color-charcoal) 100%);
    padding-bottom: var(--spacing-lg);
}

.contact h2 {
    color: var(--color-charcoal);
}

.contact-content {
    margin-top: var(--spacing-md);
}

.contact-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-warm-white);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-weight: 500;
    color: var(--color-text);
    transition: all var(--transition);
}

.contact-link:hover {
    background-color: var(--color-burgundy);
    border-color: var(--color-burgundy);
    color: var(--color-warm-white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(114, 47, 55, 0.2);
}

.contact-icon {
    font-size: 1.1rem;
    font-weight: 700;
    font-style: normal;
}

.copyright {
    text-align: center;
    margin-top: var(--spacing-xl);
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 4rem;
    }

    .nav-links {
        gap: var(--spacing-sm);
    }

    .nav-links a {
        font-size: 0.8rem;
    }

    .hero-container {
        padding: var(--spacing-md);
    }

    .hero-image {
        width: 180px;
        height: 180px;
    }

    .education-item {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    .education-year {
        width: auto;
    }

    .contact-links {
        flex-direction: column;
        align-items: center;
    }

    .contact-link {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .paper {
        padding: var(--spacing-sm);
    }
}

/* Print Styles */
@media print {
    .nav {
        display: none;
    }

    .hero {
        min-height: auto;
        padding-top: 0;
    }

    .section {
        padding: var(--spacing-md) 0;
    }

    .paper:hover {
        transform: none;
        box-shadow: none;
    }
}