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

body {
    font-family: 'Segoe UI', Tahoma, sans-serif;
    background-color: #f8f8f8;
    color: #333;
}

#thu-vien-banner {
    color: white;
    text-align: center;
    background-image: url('../images/thu_vien/img_1.png');
    background-size: cover;
    background-position: center;
    height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.5); /* Thêm hiệu ứng đổ bóng cho chữ */
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.3); /* Làm nền mờ hơn */
    z-index: 1;
}

.thu-vien-content {
    font-size: 70px;
    color: transparent;
    text-transform: uppercase;
    letter-spacing: 5px;
    font-weight: bold;
    position: relative;
    z-index: 2;
}

@supports(-webkit-text-stroke: 2px white) {
    .thu-vien-content {
        -webkit-text-stroke: 2px white;
        text-shadow: none;
        font-size: 80px;
    }
}

.templates-library {
    background-color: #fff;
    color: #333;
    padding: 60px 20px;
    text-align: center;
}

.thu-vien-2 {
    max-width: 1200px;
    margin: auto;
    padding: 0 20px;
}

.features {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-evenly;
    margin-top: 40px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.8);
    border-radius: 12px;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
    margin: 20px;
    padding: 20px;
    flex: 1 1 calc(33% - 40px);
    max-width: calc(33% - 40px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    perspective: 1000px;
}

.feature-card:hover {
    transform: translateY(-10px) scale(1.05);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

.feature-card img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    margin-bottom: 15px;
    transition: transform 0.3s ease;
}

.feature-card img:hover {
    transform: scale(1.05); /* Tăng nhẹ kích thước ảnh khi hover */
}

.feature-card h3 {
    font-size: 18px;
    text-align: center;
    font-weight: bold;
    margin-top: 10px;
    color: #444;
}

/* Responsive Layout Adjustments */
@media (max-width: 768px) {
    #thu-vien-banner {
        height: 300px; /* Reduce banner height */
    }

    .thu-vien-content {
        font-size: 60px; /* Smaller text for mobile */
        letter-spacing: 3px;
    }

    .feature-card {
        flex: 1 1 calc(50% - 40px); /* Two items per row on medium screens */
        max-width: calc(50% - 40px);
    }

    .templates-library {
        padding: 40px 20px;
    }
}

@media (max-width: 480px) {
    #thu-vien-banner {
        height: 250px; /* Further reduce banner height on small screens */
    }

    .thu-vien-content {
        font-size: 50px; /* Even smaller text */
        letter-spacing: 2px;
    }

    .feature-card {
        flex: 1 1 100%; /* Stack feature cards vertically */
        max-width: 100%;
        margin: 10px 0; /* Adjust margins for mobile */
    }

    .feature-card h3 {
        font-size: 16px; /* Smaller heading text */
    }

    .templates-library {
        padding: 20px 10px;
    }

    .videos h2 {
        font-size: 22px; /* Smaller video section title */
    }

    .video-container iframe {
        width: 100%; /* Make video iframe full-width */
        height: auto;
    }

    .video-container {
        flex-direction: column;
        gap: 10px; /* Stack videos vertically */
    }
}

/* Thêm hiệu ứng động cho các video */
@keyframes fadeIn {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}

.video-container iframe {
    animation: fadeIn 1s ease-in-out;
}