body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background: #f7f7f7;
    color: #333;
}

.nav {
    position: fixed;
    top: 0;
    width: 100%;
    backdrop-filter: blur(12px);
    background: rgba(255,255,255,0.7);
    display: flex;
    justify-content: space-between;
    padding: 15px 40px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    z-index: 100;
}

.nav a {
    margin-left: 20px;
    text-decoration: none;
    color: #333;
    font-weight: 500;
}

.hero {
    height: 100vh;
    background: url('assets/img/hero.jpg') center/cover no-repeat;
    display: flex;
    align-items: center;
    padding-left: 60px;
    color: #fff;
    text-shadow: 0 2px 10px rgba(0,0,0,0.4);
}

.section {
    padding: 100px 60px;
    text-align: center;
}

.card-container {
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.card {
    background: #fff;
    padding: 25px;
    width: 280px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: 0.3s;
}

.card:hover {
    transform: translateY(-5px);
}

.ebook-card img {
    width: 100%;
    border-radius: 12px;
    margin-bottom: 15px;
}

.price {
    display: block;
    margin: 10px 0;
    font-weight: bold;
    color: #2a7;
}