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

/* ===== BODY ===== */
body {
    font-family: Arial, sans-serif;
    background-color: #eef3fb;
    display: grid;
    grid-template-columns: 70% 30%;
    max-width: 1200px;
    margin: 0 auto;
}

/* ===== HEADER ===== */
header {
    background-color: #c7cc19;
    color: #fff;
    padding: 20px;
    text-align: center;
    grid-column: 1 / span 2;
}

/* ===== NAV ===== */
nav {
    background-color: #ffa486;
    text-align: center;
    padding: 10px;
    grid-column: 1 / span 2;
}

nav ul {
    list-style: none;
}

nav ul li {
    display: inline-block;
    margin: 0 15px;
}

nav ul li a {
    color: white;          /* chữ trắng */
    font-weight: bold;     /* in đậm */
    text-decoration: none;
    padding: 10px 18px;
    display: inline-block;
    border-radius: 5px;
}

/* ô đang active */
nav ul li a.active {
    background-color: red; /* nền đỏ */
    color: white;          /* chữ vẫn trắng */
}

/* ===== PRODUCT ===== */
.product-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding: 20px;
}

.product-card {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 15px;
    text-align: center;
}

.product-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-radius: 5px;
    margin-bottom: 10px;
}

/* ===== BUTTON ===== */
.button {
    background-color: #04AA6D;
    color: #fff;
    border: none;
    padding: 12px 20px;
    border-radius: 12px;
    cursor: pointer;
}

/* ===== SIDEBAR ===== */
.sidebar {
    padding: 20px;
}

/* BOX CHUNG */
.side-box {
    background-color: #fff;
    border: 1px solid #ddd;
    padding: 30px 15px 15px;
    margin-bottom: 25px;
    position: relative;
}

/* ===== VIDEO ===== */
.video-box {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* tỉ lệ 16:9 */
    overflow: hidden;
}

.video-box iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* TIÊU ĐỀ ĐÈ LÊN VIDEO */
.side-box h3 {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #fff;
    padding: 4px 14px;
    font-size: 15px;
    font-weight: bold;
    border: 1px solid #ddd;
    border-radius: 4px;
    color: #000;
    z-index: 2;
}

/* MÔ TẢ DƯỚI VIDEO */
.side-box p {
    font-size: 14px;
    color: #333;
    padding: 12px;
    line-height: 1.5;
    text-align: center;
}

/* ===== FOLLOW ===== */
.follow-icons {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.follow-icons img {
    width: 28px;
    height: 28px;
}

/* ===== FOOTER ===== */
.footer {
    background-color: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
    grid-column: 1 / span 2;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 576px) {
    body {
        grid-template-columns: 1fr;
    }

    .product-list {
        grid-template-columns: 1fr;
    }
}