:root {
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --accent-color: #38bdf8;
    --secondary-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Dynamic Background */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: radial-gradient(circle at 15% 50%, rgba(56, 189, 248, 0.15), transparent 25%),
                radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.15), transparent 25%);
    animation: pulse 15s ease-in-out infinite alternate;
}

@keyframes pulse {
    0% { transform: scale(1); }
    100% { transform: scale(1.1); }
}

/* Typography & Layout */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--glass-border);
}

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--accent-color);
    letter-spacing: -1px;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 600;
    transition: color 0.3s ease;
    font-size: 0.9rem;
}

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

/* Sections */
section {
    padding: 80px 5%;
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 2rem;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
}

.hero {
    min-height: 90vh;
}

.hero-content {
    max-width: 800px;
}

.subtitle {
    font-weight: 400;
    color: var(--accent-color);
    margin-bottom: 1rem;
    letter-spacing: 2px;
}

.title {
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.description {
    font-size: 1.2rem;
    color: #94a3b8;
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    background: transparent;
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.cta-button:hover {
    background: rgba(56, 189, 248, 0.1);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* Glassmorphism Cards */
.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.glass-card {
    background: var(--secondary-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card.full-width {
    grid-column: 1 / -1;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.glass-card h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--accent-color);
}

.glass-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.5rem;
}

.glass-card p {
    color: #cbd5e1;
    font-size: 1.1rem;
}

.pub-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.pub-list li {
    color: #cbd5e1;
    font-size: 0.95rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.placeholder-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 200px;
    border: 1px dashed var(--glass-border);
    background: rgba(30, 41, 59, 0.4);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    background: rgba(15, 23, 42, 0.9);
    border-top: 1px solid var(--glass-border);
    color: #64748b;
    font-size: 0.9rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none; /* simple mobile nav hide for now */
    }
}