* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --dark-red: #8B0000;
    --gold: #F4C430;
    --white: #FFFFFF;
    --light-bg: #FFF8F0;
    --text-dark: #333333;
    --shadow: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--light-bg);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    background-color: var(--dark-red);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: none;
    margin-bottom: 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    color: var(--gold);
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: var(--gold);
}

.hero {
    background-image: url('https://via.placeholder.com/1920x600/8B0000/F4C430?text=Sinterklaas');
    background-size: cover;
    background-position: center;
    min-height: 350px;
    display: block;
    position: relative;
    margin: 0;
    padding: 0;
    border-top: 4px solid var(--gold);
}

.hero-overlay {
    background-color: var(--dark-red);
    width: 100%;
    padding: 3rem 0;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 350px;
}

.hero-title {
    color: var(--gold);
    font-size: 3rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
    color: var(--white);
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--gold);
    color: var(--dark-red);
}

.btn-primary:hover {
    background-color: #FFD700;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow);
}

.btn-secondary {
    background-color: var(--dark-red);
    color: var(--white);
}

.btn-secondary:hover {
    background-color: #A00000;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow);
}

.section-title {
    text-align: center;
    color: var(--dark-red);
    font-size: 2.5rem;
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background-color: var(--gold);
}

.books-section {
    padding: 4rem 0;
    background-color: var(--white);
}

.books-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.book-card {
    background-color: var(--light-bg);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 8px var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px var(--shadow);
}

.book-cover {
    width: 100%;
    height: auto;
    object-fit: cover;
}

.book-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.book-title {
    color: var(--dark-red);
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.book-badge {
    display: inline-block;
    background-color: var(--gold);
    color: var(--dark-red);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.book-description {
    color: var(--text-dark);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.examples-section {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.examples-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.example-card {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 8px var(--shadow);
    transition: transform 0.3s ease;
}

.example-card:hover {
    transform: scale(1.05);
}

.example-card img {
    width: 100%;
    height: auto;
    display: block;
}

.examples-note {
    text-align: center;
    font-style: italic;
    color: var(--text-dark);
    font-size: 1.1rem;
}

.section-intro {
    text-align: center;
    font-size: 1.15rem;
    max-width: 800px;
    margin: 0 auto 3rem auto;
    line-height: 1.7;
    color: var(--text-dark);
}

.cadeau-section {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.cadeau-section p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    text-align: center;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

.cta-btn {
    font-size: 1.2rem;
    padding: 1.2rem 2.5rem;
    box-shadow: 0 4px 12px rgba(139, 0, 0, 0.3);
}

.cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(139, 0, 0, 0.4);
}

.internal-links {
    text-align: center;
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 2px solid var(--gold);
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.internal-links a,
.internal-link {
    color: var(--dark-red);
    font-weight: 600;
    text-decoration: none;
    font-size: 1.05rem;
    transition: color 0.3s ease;
}

.internal-links a:hover,
.internal-link:hover {
    color: var(--gold);
    text-decoration: underline;
}

.about-section {
    padding: 4rem 0;
    background-color: var(--white);
}

.about-section p {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    text-align: left;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

.about-section a {
    color: var(--dark-red);
    font-weight: 600;
    text-decoration: underline;
}

.about-section a:hover {
    color: var(--gold);
}

.footer {
    background-color: var(--dark-red);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
}

.footer p {
    margin-bottom: 0.5rem;
}

.footer-note {
    font-size: 0.875rem;
    opacity: 0.8;
}

.social-sharing {
    margin-bottom: 2rem;
    padding: 1.5rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.share-text {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--gold);
    font-weight: 600;
}

.social-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.social-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--white);
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.social-btn:hover {
    background-color: var(--gold);
    color: var(--dark-red);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.social-icon {
    font-weight: bold;
    font-size: 1.2rem;
}

.social-btn.facebook:hover {
    background-color: #1877f2;
    color: white;
    border-color: #1877f2;
}

.social-btn.pinterest:hover {
    background-color: #e60023;
    color: white;
    border-color: #e60023;
}

.social-btn.instagram:hover {
    background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%);
    color: white;
    border-color: #e6683c;
}

@media (min-width: 768px) {
    .books-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .examples-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .books-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .examples-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .hero-title {
        font-size: 4rem;
    }

    .hero-subtitle {
        font-size: 2rem;
    }
}

@media (max-width: 767px) {
    .nav-menu {
        gap: 1rem;
    }

    .nav-menu a {
        font-size: 0.9rem;
    }

    .nav-brand {
        font-size: 1.2rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .section-title {
        font-size: 2rem;
    }
}