:root {
    /* Bio-Intelligence Palette */
    --navy-deep: #002147;
    /* Primary Brand */
    --teal-accent: #008080;
    /* Medical/Science Accent */
    --white-clinical: #F9F9F9;
    /* Background */
    --text-dark: #1A1A1A;
    /* Body Text */
    --text-muted: #555555;
    /* Meta Info */
    --border-subtle: #E0E0E0;

    /* Typography */
    --font-heading: 'Inter', -apple-system, sans-serif;
    --font-body: 'Merriweather', 'Georgia', serif;
    --font-mono: 'Fira Code', monospace;
}

body {
    background-color: var(--white-clinical);
    color: var(--text-dark);
    font-family: var(--font-body);
    line-height: 1.7;
    margin: 0;
    padding: 0;
}

h1,
h2,
h3,
h4,
.nav-brand,
.btn {
    font-family: var(--font-heading);
}

/* Navbar */
.navbar {
    background: white;
    border-bottom: 2px solid var(--navy-deep);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--navy-deep);
    text-decoration: none;
    letter-spacing: -0.02em;
}

/* Hero Section */
.hero {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 5%;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}

.hero-bio h1 {
    font-size: 3rem;
    color: var(--navy-deep);
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero-bio p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    text-align: justify;
}

.hero-image-container {
    position: relative;
    width: 350px;
    height: 350px;
    margin: 0 auto;
}

.hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    border: 4px solid white;
    box-shadow: 0 0 0 4px var(--teal-accent);
}

/* Featured Research (Journal Cards) */
.section-title {
    text-align: center;
    font-size: 2rem;
    color: var(--navy-deep);
    margin: 6rem 0 3rem;
}

.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5%;
}

.journal-card {
    background: white;
    border: 1px solid var(--border-subtle);
    border-top: 4px solid var(--navy-deep);
    padding: 2rem;
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
}

.journal-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 33, 71, 0.1);
    border-top-color: var(--teal-accent);
}

.journal-meta {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    color: var(--teal-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    font-weight: 600;
}

.journal-title {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: var(--navy-deep);
    line-height: 1.3;
}

.journal-abstract {
    font-size: 0.95rem;
    color: var(--text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 1.5rem;
}

/* Visualization Section */
.viz-container {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 5%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.viz-box {
    background: white;
    padding: 2rem;
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
}

/* Archive Table */
.archive-container {
    max-width: 1200px;
    margin: 0 auto 6rem;
    padding: 0 5%;
}

.archive-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    font-family: var(--font-heading);
    font-size: 0.9rem;
}

.archive-table th {
    text-align: left;
    padding: 1rem;
    background: var(--navy-deep);
    color: white;
    font-weight: 500;
}

.archive-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-subtle);
}

.archive-table tr:hover {
    background-color: #f0f7ff;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.6rem;
    background: var(--navy-deep);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 500;
    transition: background 0.2s;
}

.btn:hover {
    background: var(--teal-accent);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--navy-deep);
    color: var(--navy-deep);
}

.btn-outline:hover {
    background: var(--navy-deep);
    color: white;
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero-image-container {
        width: 250px;
        height: 250px;
        grid-row: 1;
        /* Image first on mobile */
    }

    .viz-container {
        grid-template-columns: 1fr;
    }
}