body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: #f4f6f8;
    color: #333;
}

.hero {
    background: linear-gradient(135deg,#0f2027,#203a43,#2c5364);
    color: white;
    padding: 60px 20px;
    text-align: center;
}

.hero h1 { font-size: 42px; }
.hero p { font-size: 18px; }

.btn-primary {
    background: gold;
    padding: 12px 25px;
    color: black;
    text-decoration: none;
    border-radius: 30px;
    font-weight: bold;
}

.library {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px,1fr));
    gap: 20px;
    padding: 40px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0,0,0,.08);
    position: relative;
}

.badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: #2c5364;
    color: white;
    padding: 5px 10px;
    font-size: 12px;
    border-radius: 20px;
}

.card audio,
.card video {
    width: 100%;
    margin-top: 10px;
}

.lock {
    margin-top: 10px;
    font-size: 14px;
    color: crimson;
}

footer {
    background: #111;
    color: #aaa;
    text-align: center;
    padding: 20px;
}