/* === CSS Variables === */
:root {
    --color-bg: #faf9f7;
    --color-bg-alt: #f0eeeb;
    --color-text: #2c2c2c;
    --color-text-muted: #666;
    --color-accent: #8b4513;
    --color-accent-hover: #6b3410;
    --color-border: #e0ded9;
    --font-serif: 'Crimson Pro', Georgia, serif;
    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width: 800px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

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

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

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

.section {
    padding: var(--spacing-md) 0;
    scroll-margin-top: 60px;
}

/* === Header & Navigation === */
.header {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    background: var(--color-bg);
    z-index: 100;
}

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

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    color: var(--color-text-muted);
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: width 0.3s ease;
}

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

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

/* === About Section === */
.about-section {
    padding-top: var(--spacing-md);
}

.about-content {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: var(--spacing-md);
    align-items: start;
}

.photo-container {
    position: relative;
}

.profile-photo {
    width: 180px;
    height: 180px;
    object-fit: cover;
    border-radius: 50%;
    filter: grayscale(10%);
    transition: filter 0.3s ease;
}

.profile-photo:hover {
    filter: grayscale(0%);
}

.name {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 500;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.title {
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.email-line {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: 6px;
}

.email-inline {
    height: 18px;
    width: auto;
    vertical-align: middle;
    opacity: 0.85;
}

.bio {
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-bg-alt);
    color: var(--color-text-muted);
    transition: all 0.2s ease;
}

.social-link:hover {
    background: var(--color-accent);
    color: white;
    transform: translateY(-2px);
}

/* === News Section === */
.news-section {
    border-top: 1px solid var(--color-border);
}

.news-list {
    list-style: none;
    padding: 0;
}

.news-list li {
    padding: 4px 0;
    padding-left: var(--spacing-sm);
    border-left: 2px solid var(--color-border);
    margin-bottom: 2px;
    font-size: 0.95rem;
    color: var(--color-text);
}

.news-list li:hover {
    border-left-color: var(--color-accent);
}

/* === Publications Section === */
.publications-section {
    border-top: 1px solid var(--color-border);
}

.section-title {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.01em;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
}

.publications-list {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.publication {
    display: grid;
    grid-template-columns: 50px 1fr;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.publication:last-child {
    border-bottom: none;
}

.pub-year {
    font-family: var(--font-serif);
    font-size: 1rem;
    color: var(--color-text-muted);
    font-style: italic;
}

.pub-title {
    font-size: 1.05rem;
    font-weight: 500;
    line-height: 1.5;
    margin-bottom: var(--spacing-xs);
}

.pub-title a {
    color: var(--color-text);
}

.pub-title a:hover {
    color: var(--color-accent);
}

.pub-authors {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.pub-authors strong {
    color: var(--color-text);
    font-weight: 600;
}

.pub-venue {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-style: italic;
}

.pub-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xs);
}

.pub-link {
    font-size: 0.8rem;
    font-weight: 500;
    padding: 4px 12px;
    background: var(--color-bg-alt);
    border-radius: 3px;
    color: var(--color-text-muted);
    transition: all 0.2s ease;
}

.pub-link:hover {
    background: var(--color-accent);
    color: white;
}

/* === Contact Section === */
.contact-section {
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.contact-content p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.email-container {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-alt);
    border-radius: 4px;
}

.email-image {
    height: 24px;
    width: auto;
    opacity: 0.85;
}

/* === Footer === */
.footer {
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer p {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* === Responsive Design === */
@media (max-width: 640px) {
    html {
        font-size: 15px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .photo-container {
        display: flex;
        justify-content: center;
    }
    
    .profile-photo {
        width: 150px;
        height: 150px;
    }
    
    .name {
        font-size: 2rem;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .email-line {
        justify-content: center;
    }
    
    .publication {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }
    
    .pub-year {
        font-size: 0.85rem;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
    }
}

/* === Subtle Animations === */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.about-section,
.news-section,
.publications-section,
.contact-section {
    animation: fadeIn 0.6s ease-out;
}

/* === Selection Styling === */
::selection {
    background: var(--color-accent);
    color: white;
}