:root {
    --bg-main: #0a0a0a;
    --bg-surface: #121212;
    --bg-card: #1e1e1e;
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --accent: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.15);
    --border-color: rgba(255, 255, 255, 0.08);
}

* {
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.7;
}

/* Glassmorphism Navigation */
nav {
    background-color: rgba(10, 10, 10, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.nav-content {
    display: flex;
    justify-content: center;
    padding: 1rem;
    max-width: 1000px;
    margin: 0 auto;
}

nav a {
    color: var(--text-muted);
    text-decoration: none;
    margin: 0 1.2rem;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

nav a:hover, nav a.active {
    color: var(--accent);
    text-shadow: 0 0 8px var(--accent-glow);
}

/* Cinematic Hero Section */
.hero {
    height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: radial-gradient(circle at center, var(--bg-surface) 0%, var(--bg-main) 100%);
    padding: 0 2rem;
    margin-top: 60px; /* Offset for fixed nav */
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin: 0;
    background: linear-gradient(135deg, #ffffff 0%, var(--text-muted) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--accent);
    margin-top: 1rem;
    font-weight: 400;
    letter-spacing: 0.5px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

section {
    padding: 4rem 0;
    border-bottom: 1px solid var(--border-color);
}

section:last-child {
    border-bottom: none;
}

h2 {
    font-size: 2rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 2rem;
    display: inline-block;
}

h2::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: var(--accent);
    margin-top: 8px;
    border-radius: 2px;
}

/* Sleek Cards */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    border-color: rgba(255, 255, 255, 0.15);
}

.highlight-card {
    border-left: 3px solid var(--accent);
    background: linear-gradient(145deg, var(--bg-card) 0%, var(--bg-surface) 100%);
}

.title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #ffffff;
}

.subtitle {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
    margin-bottom: 1rem;
}

.date {
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    float: right;
    background: var(--accent-glow);
    padding: 0.2rem 0.8rem;
    border-radius: 20px;
}

ul {
    padding-left: 1.2rem;
    margin-top: 0.5rem;
    color: var(--text-muted);
}

li {
    margin-bottom: 0.5rem;
}

.publications-list li strong {
    color: #ffffff;
}

/* Modern Contact Buttons */
.contact-info {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.contact-info a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    background-color: var(--bg-card);
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.contact-info a:hover {
    background-color: var(--accent);
    border-color: var(--accent);
    color: var(--bg-main);
    box-shadow: 0 0 15px var(--accent-glow);
}

footer {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

/* Fade-in Animation for scrolling */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .date { float: none; display: inline-block; margin-bottom: 1rem; }
    .nav-content { flex-wrap: wrap; justify-content: center; gap: 10px; }
    nav a { margin: 0.2rem; }
}