body {
    font-family: 'Inter', sans-serif;
}
.hero-bg {
    background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../img/slide-2.jpg');
    background-size: cover;
    background-position: center;
}
.section-title {
    font-weight: 800;
    font-size: 2.25rem; /* 36px */
    line-height: 2.5rem; /* 40px */
    color: #111827; /* gray-900 */
}
.section-subtitle {
    font-size: 1.125rem; /* 18px */
    line-height: 1.75rem; /* 28px */
    color: #4B5563; /* gray-600 */
}
.nav-link {
    padding: 8px 16px;
    border-radius: 8px;
    transition: background-color 0.3s, color 0.3s;
}
.nav-link.active, .nav-link:hover {
    background-color: #4F46E5; /* indigo-600 */
    color: white;
}
.fade-in {
    animation: fadeIn 1s ease-in-out;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}