:root {
    --primary: #4f46e5;
    --secondary: #e61c59;
    --primary-gradient: linear-gradient(135deg, #4f46e5, #e61c59);
    --secondary-gradient: linear-gradient(135deg, #e61c59, #ff4d82);
    --tertiary-gradient: linear-gradient(90deg, #22c55e, #16a34a);
    --background: #f0f9ff;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, #f0f9ff 0%, #ffe4e9 100%);
    min-height: 100vh;
    margin: 0;
    padding: 0;
    background-image: url(/assets/images/background.png);
    background-attachment: fixed;
    background-position: center;
}

.navbar {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    padding: 1rem 2rem;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 4px solid;
    border-image: var(--primary-gradient) 1;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.navbar-brand i {
    font-size: 1.75rem;
    color: var(--secondary);
    -webkit-text-fill-color: initial;
}

.bookmark-icons {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.bookmark-icons a {
    color: var(--text-light);
    font-size: 1.25rem;
    transition: all 0.3s ease;
    position: relative;
}

.bookmark-icons a:hover {
    color: var(--secondary);
    transform: translateY(-2px);
}

.bookmark-icons a::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    background: var(--primary-gradient);
    bottom: -5px;
    left: 0;
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.bookmark-icons a:hover::after {
    transform: scaleX(1);
}

.main-content {
    margin-top: 6rem;
    padding: 2rem 4rem;
    display: flex;
    justify-content: center;
}

.card {
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 1.5rem;
    box-shadow: 
        0 4px 6px -1px rgb(0 0 0 / 0.1),
        0 0 0 1px rgba(255, 255, 255, 0.5) inset;
    transition: all 0.3s ease;
    overflow: hidden;
    width: 100%;
    max-width: 600px;
    position: relative;
    margin: 10px;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
}

.card:hover {
    box-shadow: 
        0 20px 25px -5px rgb(0 0 0 / 0.1),
        0 0 0 1px rgba(255, 255, 255, 0.5) inset;
    transform: translateY(-5px);
}

.card-body {
    padding: 2.5rem;
    background: radial-gradient(circle at top right, rgba(230, 28, 89, 0.1) 0%, transparent 60%);
}

.subject-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    display: inline-block;
    filter: drop-shadow(0 4px 3px rgb(0 0 0 / 0.07));
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0); }
    50% { transform: translateY(-10px) rotate(5deg); }
}

.card-title {
    color: var(--text);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.card-text {
    color: var(--text-light);
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 2rem;
}

.btn-container {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.level-btn {
    padding: 1rem 1.5rem;
    border-radius: 1rem;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    flex: 1;
    min-width: 150px;
    text-align: center;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn-havo-2 {
    background: var(--primary-gradient);
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

.btn-havo-2:hover {
    color: white;
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

.btn-havo-3 {
    background: var(--secondary-gradient);
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(230, 28, 89, 0.3);
}

.btn-havo-3:hover {
    color: white;
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 20px rgba(230, 28, 89, 0.4);
}

.btn-mavo-2 {
    background: var(--tertiary-gradient); /* Voeg een nieuwe gradient toe in je CSS-variabelen */
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(34, 197, 94, 0.3); /* Groenachtige schaduw voor Mavo 2 */
}

.btn-mavo-2:hover {
    color: white;
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 20px rgba(34, 197, 94, 0.4); /* Intensere schaduw bij hover */
}


.small {
    font-size: 0.85rem;
    opacity: 0.9;
    margin-top: 0.5rem;
}

footer {
    color: #ffffff;
    text-align: center;
}

@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }
    
    .card-body {
        padding: 1.5rem;
    }

    .btn-container {
        flex-direction: column;
    }

    .level-btn {
        width: 100%;
    }
}