/* Global Reset & Variables */
:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --accent-color: #2c3e50;
    /* Dark Slate Blue */
    --link-color: #2980b9;
    --link-hover-color: #3498db;
    --nav-bg: #f8f9fa;
    --border-color: #e9ecef;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --max-width: 900px;
}

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

body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    color: var(--link-hover-color);
    text-decoration: underline;
}

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
header {
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--accent-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 20px;
    list-style: none;
}

.nav-links a {
    color: var(--text-color);
    font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--link-color);
}

/* Main Content */
main {
    padding-bottom: 4rem;
}

h1,
h2,
h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
    line-height: 1.3;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

h2 {
    font-size: 1.8rem;
    margin-top: 2rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.3rem;
    margin-top: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

ul {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

/* Specific Sections */
.hero {
    text-align: center;
    padding: 3rem 0;
}

.hero h1 {
    margin-bottom: 0.5rem;
}

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

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

.publication-item {
    margin-bottom: 2rem;
}

.pub-title {
    font-weight: 600;
    font-size: 1.1rem;
    display: block;
    margin-bottom: 0.2rem;
}

.pub-meta {
    color: #555;
    margin-bottom: 0.5rem;
    display: block;
}

.journal-name {
    font-style: italic;
    font-weight: 700;
}

.pub-abstract {
    font-size: 0.95rem;
    color: #444;
    background: #f9f9f9;
    padding: 10px;
    border-left: 3px solid var(--border-color);
    margin-top: 5px;
}

details {
    margin-top: 0.5rem;
}

summary {
    cursor: pointer;
    color: var(--link-color);
    font-size: 0.9rem;
    font-weight: 500;
    user-select: none;
    list-style: none;
    /* Hide default triangle in some browsers */
}

summary::-webkit-details-marker {
    display: none;
    /* Hide default triangle in Chrome/Safari */
}

summary::after {
    content: " [+]";
    font-size: 0.8em;
}

details[open] summary::after {
    content: " [-]";
}

summary:hover {
    text-decoration: underline;
}

.contact-info {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    color: #777;
    font-size: 0.9rem;
    margin-top: auto;
}

/* Responsive */
@media (max-width: 600px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }

    h1 {
        font-size: 2rem;
    }
}