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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f8f5f0;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 20px;
}

.cover-section {
    text-align: center;
}

.book-cover {
    max-width: 100%;
    border-radius: 12px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    width: 100%;
}

.content h1 {
    font-size: 2.8rem;
    margin-bottom: 0px;
    color: #2c3e50;
}

/* Responsive */
@media (max-width: 768px) {
    .content h1 {
        font-size: 2.0rem;
    }
}

.subtitle {
    font-size: 1.3rem;
    color: #666;
    margin-bottom: 30px;
}

.description {
    font-size: 1.15rem;
    margin-bottom: 10px;
    color: #444;
}

.preorder-btn {
    display: inline-block;
    background: #e74c3c;
    color: white;
    padding: 16px 40px;
    font-size: 1.3rem;
    font-weight: 600;
    border-radius: 50px;
    text-decoration: none;
    margin-bottom: 40px;
    transition: all 0.3s ease;
}

.preorder-btn:hover {
    background: #c0392b;
    transform: translateY(-3px);
}

.app-download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
}

.app-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 24px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.ios-btn {
    background: #000;
    color: white;
}

.ios-btn:hover {
    background: #333;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.android-btn {
    background: #3ddc84;
    color: white;
}

.android-btn:hover {
    background: #2e7d32;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(46, 125, 50, 0.3);
}

.app-icon {
    width: 20px;
    height: 20px;
}

.creators {
    gap: 40px;
}

.creator {
    text-align: center;
    margin-bottom: 40px;
}

.creator-photo {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 15px;
    border: 4px solid #fff;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.creator h3 {
    margin-bottom: 8px;
    color: #2c3e50;
}

.copyright {
    margin-top: 60px;
    font-size: 0.95rem;
    color: #777;
    text-align: center;
    border-top: 1px solid #ddd;
    padding-top: 30px;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .book-cover {
        max-width: 100%;
    }

    .app-download-buttons {
        flex-direction: column;
        gap: 15px;
    }

    .app-btn {
        justify-content: center;
        padding: 16px 24px;
        font-size: 1.2rem;
    }
}