:root {
    --bg-color: #0b0e14;
    --surface-color: rgba(25, 30, 40, 0.7);
    --primary-color: #4cc9f0;
    --secondary-color: #7209b7;
    --accent-color: #f72585;
    --text-primary: #e0e6ed;
    --text-secondary: #94a3b8;
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.8);
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Decoration */
.bg-blob {
    position: fixed;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--secondary-color), transparent 70%);
    filter: blur(80px);
    z-index: -1;
    opacity: 0.2;
    border-radius: 50%;
}

.blob-1 { top: -100px; right: -100px; }
.blob-2 { bottom: -100px; left: -100px; background: radial-gradient(circle, var(--primary-color), transparent 70%); }

/* Glassmorphism Utility */
.glass {
    background: var(--surface-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

/* Navigation */
nav {
    position: sticky;
    top: 0;
    width: 100%;
    padding: 1.5rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    transition: background 0.3s;
}

nav.scrolled {
    background: rgba(11, 14, 20, 0.9);
    backdrop-filter: blur(10px);
}

.logo {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: -0.5px;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Hero Section */
.hero {
    height: 90vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 1rem;
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(3rem, 10vw, 6rem);
    font-weight: 900;
    margin-bottom: 1rem;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: fadeInDown 1s ease-out;
}

.hero p.tagline {
    font-size: 1.5rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin-bottom: 1.5rem;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero p.description {
    max-width: 600px;
    color: var(--text-secondary);
    opacity: 0.8;
    animation: fadeInUp 1s ease-out 0.4s both;
}

/* Research Section */
.section {
    padding: 6rem 10%;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 2px;
}

/* Featured Research */
.latest-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.card {
    padding: 2rem;
    transition: transform 0.3s, border-color 0.3s;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
}

.card .date {
    font-size: 0.85rem;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.card h3 {
    margin-bottom: 1rem;
    font-family: var(--font-heading);
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.read-more {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Archive Search */
.search-container {
    margin-bottom: 2rem;
}

.search-input {
    width: 100%;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: white;
    font-size: 1rem;
    font-family: var(--font-body);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255, 255, 255, 0.1);
}

.archive-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.archive-item {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s;
}

.archive-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.archive-info h4 {
    font-family: var(--font-heading);
    margin-bottom: 0.25rem;
}

.archive-info span {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Animations */
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
@media (max-width: 768px) {
    .section { padding: 4rem 5%; }
    .hero p.tagline { font-size: 1.2rem; }
    .archive-item { flex-direction: column; align-items: flex-start; gap: 1rem; }
}