:root {
    --brand-pink: #F690A6;
    --brand-dark-pink: #e07b91;
    --dark-text: #333;
    --light-bg: #f8f9fa;
}

body {
    font-family: 'Poppins', sans-serif;
    overflow-x: hidden;
}

/* Navbar Logic */
.navbar {
    transition: all 0.4s ease-in-out;
    padding: 15px 0;
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.95) !important;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
    padding: 8px 0;
}

.navbar-brand {
    font-weight: 700;
    color: var(--brand-pink) !important;
    font-size: 1.6rem;
}

.nav-link {
    color: white !important;
    font-weight: 500;
    margin: 0 10px;
    position: relative;
}

.navbar.scrolled .nav-link {
    color: var(--dark-text) !important;
}

/* Hover underline effect */
.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--brand-pink);
    transition: 0.3s;
}

.nav-link:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.3)), 
                url('https://images.unsplash.com/photo-1576091160550-2173dba999ef?auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed; /* Parallax effect */
    display: flex;
    align-items: center;
    color: white;
}

.btn-pink {
    background-color: var(--brand-pink);
    color: white;
    border-radius: 50px;
    padding: 12px 35px;
    border: 2px solid var(--brand-pink);
    font-weight: 600;
    transition: 0.4s;
}

.btn-pink:hover {
    background-color: transparent;
    color: var(--brand-pink);
    transform: scale(1.05);
}

/* Disease Cards */
.disease-card {
    border: none;
    border-radius: 20px;
    background: white;
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    cursor: pointer;
}

.disease-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 15px 30px rgba(246, 144, 166, 0.25);
    border-bottom: 5px solid var(--brand-pink);
}

.card-title {
    color: var(--brand-pink);
    font-weight: 700;
}

/* Footer */
footer {
    background: #222;
    color: #eee;
    padding: 60px 0 20px;
}