:root {
    --primary-color: #0d47a1; /* Deep biotech blue */
    --secondary-color: #1976d2; /* Lighter blue */
    --accent-color: #00acc1; /* Cyan for modern flair */
    --text-color: #333333;
    --light-bg: #f5f7fa;
    --dark-bg: #1a237e;
}

body {
    font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-color);
    background-color: #ffffff;
    padding-top: 76px; /* Offset for fixed navbar */
}

/* Navbar */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.navbar-brand img {
    height: 50px; /* Adjust based on logo size */
}

.nav-link {
    font-weight: 500;
    color: #444 !important;
    transition: color 0.3s ease;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    padding-left: 1rem !important;
    padding-right: 1rem !important;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color) !important;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--primary-color) 100%);
    color: white;
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: url('images/hero-bg-pattern.svg') center/cover; /* Placeholder for a subtle background pattern */
    opacity: 0.1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 300;
    margin-bottom: 40px;
    opacity: 0.9;
}

.btn-custom {
    background-color: var(--accent-color);
    color: white;
    font-weight: 600;
    padding: 12px 30px;
    border-radius: 50px;
    transition: all 0.3s ease;
    border: none;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-custom:hover {
    background-color: #00838f;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 172, 193, 0.4);
}

.btn-outline-light {
    border-radius: 50px;
    padding: 12px 30px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Sections */
.section-padding {
    padding: 80px 0;
}

.section-title {
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 40px;
    position: relative;
    display: inline-block;
}

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

.bg-light-custom {
    background-color: var(--light-bg);
}

/* Footer */
.footer {
    background-color: var(--dark-bg);
    color: white;
    padding: 60px 0 30px;
}

.footer a {
    color: #bbdefb;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: white;
}