.content-end {
    position: relative;
    padding-bottom: 500px; /* 为遮罩层预留空间 */
}
body{
    position: relative;
}
.premium-lock {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0; /* 定位到父元素底部 */
    height: 500px;
    background: white;
}

.blur-overlay {
    position: absolute;
    top: -300px;
    left: 0;
    right: 0;
    height: 300px;
    background: linear-gradient(
        to top,
        rgba(255, 255, 255, 1) 0%,
        rgba(255, 255, 255, 0.98) 20%,
        rgba(255, 255, 255, 0.85) 40%,
        rgba(255, 255, 255, 0.5) 70%,
        rgba(255, 255, 255, 0) 100%
    );
    z-index: 10;
}

.lock-message {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    text-align: center;
    padding: 30px 20px;
    background: white;
}

.premium-badge {
    display: inline-block;
    background: #ffcd3c;
    color: #000;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.lock-message h2 {
    font-size: 24px;
    color: #333;
    margin: 15px 0;
    font-weight: 600;
}

.lock-message p {
    color: #666;
    margin: 0 auto 25px;
    max-width: 600px;
    font-size: 16px;
    line-height: 1.6;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 140px;
    padding: 12px 25px;
    background: #4a9eff;
    color: white;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.2s ease;
}

.button:hover {
    opacity: 0.95;
    transform: translateY(-1px);
}

@media (max-width: 480px) {
    .premium-lock {
        height: 400px;
        margin-top: -250px;
    }

    .blur-overlay {
        height: 250px;
    }

    .lock-message {
        top: 150px;
        padding: 20px 15px;
    }

    .premium-badge {
        font-size: 13px;
        padding: 4px 12px;
    }

    .lock-message h2 {
        font-size: 20px;
        padding: 0 20px;
    }
    
    .lock-message p {
        font-size: 14px;
        padding: 0 25px;
    }
    
    .button {
        min-width: 160px;
        font-size: 15px;
    }
}