:root {
    --primary: #004e36; /* UdeS Green-ish tone */
    --secondary: #2c3e50; /* Dark Blue for text/headings */
    --accent: #3498db; /* Blue for links/highlights */
    --light: #f8f9fa;
    --text: #333;
    --gray: #6c757d;
}

/* Base */
body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    margin: 0;
    padding: 0;
    background-color: white;
}
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}
h1, h2, h3 { color: var(--secondary); line-height: 1.2; }
h2 {
    font-size: 2.2rem;
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent);
    display: inline-block;
}
a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary); }

/* Header and Navigation */
header {
    background: var(--primary);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}
.nav-flex {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 1.6rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
}
.nav-links a {
    margin-left: 25px;
    text-decoration: none;
    color: white;
    font-weight: 500;
    padding: 5px 0;
    border-bottom: 2px solid transparent;
}
.nav-links a:hover, .nav-links a.active {
    color: white;
    border-bottom: 2px solid var(--accent);
}

/* Hero Section (Specific to index.html) */
.hero {
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://via.placeholder.com/1920x400/2c3e50/ffffff?text=AI+for+Medical+Imaging') no-repeat center center/cover;
    color: white;
    padding: 4rem 0 6rem; /* Adjusted top padding */
    text-align: center;
}
/* NEW STYLE FOR PROFILE PHOTO */
.profile-photo {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 20px;
    border: 5px solid white; 
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.4);
}
/* END NEW STYLE */

/* Stats Grid (MODIFIED FOR SMALLER TEXT) */
.stats-grid {
    display: flex;
    justify-content: space-around;
    padding: 2rem 0; 
    background: var(--light);
}
.stat-item {
    text-align: center;
}
/* Smaller H3 for stats */
.stat-item h3 { font-size: 2.2rem; margin: 0; color: var(--primary); } 
/* Smaller font for context */
.stat-item p { margin: 0; color: var(--gray); text-transform: uppercase; font-size: 0.8rem; font-weight: 600; } 

/* Card Component (Used for Research/Open Science) */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}
.card {
    background: white;
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 25px;
    transition: box-shadow 0.3s, border-color 0.3s;
}
.card:hover {
    box-shadow: 0 10px 20px rgba(0,0,0,0.08);
    border-color: var(--accent);
}
.tag {
    display: inline-block;
    background: #e1f5fe;
    color: #0288d1;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    margin-right: 5px;
    margin-bottom: 5px;
}
.list-unstyled {
    list-style: none;
    padding-left: 0;
}
.list-unstyled li {
    margin-bottom: 15px;
    border-bottom: 1px dashed #ddd;
    padding-bottom: 10px;
}

/* Footer */
footer {
    background: var(--secondary);
    color: white;
    padding: 3rem 0;
    text-align: center;
}
footer a { color: var(--accent); }

/* Responsive adjustments */
@media (max-width: 768px) {
    .nav-flex { flex-direction: column; }
    .nav-links { margin-top: 10px; }
    .nav-links a { margin: 0 10px; }
    .hero h1 { font-size: 2.5rem; }
    .stats-grid { flex-direction: column; gap: 20px; padding: 2rem 0; }
    .stat-item h3 { font-size: 2rem; }
}