/* Reset e Estilos Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* Header */
.header {
    background-color: #1a1a1a;
    color: white;
    padding: 20px 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 0.5px;
}

/* Main Content */
.main {
    min-height: calc(100vh - 140px);
}

/* Hero Section */
.hero {
    background-color: white;
    padding: 60px 0;
    border-bottom: 1px solid #e0e0e0;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 10px;
    text-align: center;
}

.hero-subtitle {
    font-size: 24px;
    color: #d4a574;
    text-align: center;
    margin-bottom: 40px;
    font-weight: 600;
}

.content-box {
    background-color: #f8f9fa;
    padding: 30px;
    border-radius: 8px;
    margin-bottom: 40px;
    border-left: 4px solid #d4a574;
}

.description {
    font-size: 16px;
    line-height: 1.8;
    color: #555;
    text-align: center;
}

/* Book Info */
.book-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 40px;
    text-align: center;
}

.info-item {
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
}

.label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    color: #999;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.value {
    display: block;
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
}

/* Offer Section */
.offer-section {
    background-color: #f8f9fa;
    padding: 30px;
    border-radius: 8px;
    margin-bottom: 40px;
    text-align: center;
}

.offer-label {
    font-size: 14px;
    font-weight: 700;
    color: #999;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 15px;
}

.price-box {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 5px;
}

.currency {
    font-size: 20px;
    font-weight: 600;
    color: #d4a574;
}

.price {
    font-size: 56px;
    font-weight: 700;
    color: #1a1a1a;
}

/* CTA Button */
.cta-button {
    display: block;
    margin: 0 auto;
    padding: 16px 40px;
    background-color: #1a1a1a;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.cta-button:hover {
    background-color: #d4a574;
    color: #1a1a1a;
    transform: translateY(-2px);
}

.cta-button:active {
    transform: translateY(0);
}

/* Topics Section */
.topics {
    background-color: #f8f9fa;
    padding: 60px 0;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: #1a1a1a;
    text-align: center;
    margin-bottom: 40px;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.topic-card {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    border-top: 4px solid #d4a574;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.topic-card:hover {
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}

.topic-card h4 {
    font-size: 18px;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 12px;
}

.topic-card p {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
}

/* Footer */
.footer {
    background-color: #1a1a1a;
    color: white;
    padding: 30px 0;
    text-align: center;
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .book-info {
        grid-template-columns: 1fr;
    }

    .price {
        font-size: 42px;
    }

    .section-title {
        font-size: 24px;
    }

    .topics-grid {
        grid-template-columns: 1fr;
    }

    .hero {
        padding: 40px 0;
    }

    .topics {
        padding: 40px 0;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .price {
        font-size: 36px;
    }

    .cta-button {
        padding: 14px 30px;
        font-size: 14px;
    }
}