* {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
        font-family: Arial, sans-serif;
    }

    body {
        background: #f8f8f8;
        padding: 20px;
    }

    header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        background: #fff;
        padding: 40px 30px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        position: sticky;
        top: 0;
        z-index: 100;
    }

    .logo img {
        height: 50px;
    }

    /* menu chính */
    .menu {
        list-style: none;
        display: flex;
        gap: 40px;
        margin-left: 0;
        align-items: center;
    }

    .menu>li {
        position: relative;
    }

    .menu a {
        white-space: nowrap;
        text-decoration: none;
        color: #333;
        font-weight: 600;
        padding: 8px;
        font-size: 15px;
    }

    .menu a:hover {
        color: #ff9900;
    }

    /* submenu */
    .submenu {
        list-style: none;
        position: absolute;
        top: 100%;
        left: 0;
        background: #fff;
        padding: 10px 0;
        min-width: 150px;
        display: none;
        box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);

    }

    .submenu li a {
        display: block;
        padding: 8px 15px;
        color: #333;
    }

    .submenu li a:hover {
        background: #f1f1f1;
        color: #ff9900;
    }

    .menu li:hover .submenu {
        display: block;
    }

    /* khối bên phải */
    .right-box {
        display: flex;
        align-items: center;
    }

    .right-box input {
        border: none;
        border-bottom: 1px solid #ccc;
        padding: 5px 10px;
        outline: none;
    }

    .right-box i {
        font-size: 18px;
        color: #333;
        margin-left: 10px;
    }

    .right-box i:hover {
        color: #ff9900;
    }

    /* top right */
    .top-right a {
        color: #000;
        text-decoration: none;
        margin: 0 5px;
        font-size: 16px;
        font-weight: 500;
    }

    .top-right a:hover {
        color: #74C0FC;
    }

    /* banner */
    nav {
        padding: 20px;
        text-align: center;
        display: inline-block;
    }

    nav img {
        max-width: 100%;
        border-radius: 8px;
    }

    nav h3 {
        position: absolute;
        top: 50%;
        /* đẩy xuống giữa */
        left: 50%;
        /* đẩy sang giữa */
        transform: translate(-50%, -50%);
        /* căn giữa chuẩn */
        color: black;
        /* màu chữ */
        font-size: 28px;
        font-weight: bold;
    }

    /*============================ Thông tin sp ===============*/
    .thongtin {
        display: flex;
        max-width: 1200px;
        margin: 0 auto;
        background: #fff;
        border-radius: 10px;
        overflow: hidden;
    }

    /* Bên trái: thông tin nhận hàng */
    .left {
        flex: 2;
        padding: 40px;
    }

    .left h2 {
        color: red;
        font-size: 30px;
        margin-bottom: 20px;
        padding: 0 230px;
    }

    .form-group {
        margin-bottom: 15px;
    }

    label {
        display: block;
        font-weight: bold;
        margin-bottom: 5px;
    }

    input,
    select,
    textarea {
        width: 100%;
        padding: 10px;
        border: 1px solid #ccc;
        border-radius: 6px;
        font-size: 15px;
    }

    textarea {
        resize: none;
    }

    .payment {
        margin-top: 25px;
        padding: 15px;
        border: 1px solid #ddd;
        border-radius: 8px;
    }

    /* Bên phải: đơn hàng */
    .right {
        flex: 1.2;
        background: #fafafa;
        padding: 40px;
        border-left: 1px solid #eee;
    }

    .right h3 {
        margin-bottom: 20px;
        color: red ;
        font-size: 30px;
    }

    .product {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: 15px;
    }

    .product img {
        width: 60px;
        height: 60px;
        border-radius: 8px;
        margin-right: 10px;
    }

    .product-info {
        flex: 1;
        font-size: 17px;
    }

    .price {
        font-weight: bold;
    }

    .total {
        border-top: 1px solid #ddd;
        margin-top: 15px;
        padding-top: 15px;
        display: flex;
        justify-content: space-between;
        font-size: 18px;
        font-weight: bold;
        color: #0077cc;
    }

    .apply {
        display: flex;
        margin-top: 15px;
    }

    .apply input {
        flex: 1;
        margin-right: 10px;
    }

    .apply button {
        background: #0077cc;
        color: white;
        border: none;
        border-radius: 5px;
        padding: 10px 20px;
        cursor: pointer;
    }

    .btn-order {
        width: 100%;
        margin-top: 25px;
        background: #ff6600;
        color: white;
        border: none;
        border-radius: 6px;
        padding: 15px;
        font-size: 16px;
        cursor: pointer;
    }

    .btn-order:hover {
        background: #e65c00;
    }


    /* ================= FOOTER ================= */
    .site-footer {
        clear: both;
        background: #222;
        /* nền xám đậm */
        color: #ddd;
        /* chữ xám nhạt */
        padding: 40px 20px 20px;
        font-size: 14px;
        margin-top: 40px;
        width: 100%;
    }

    .site-footer .footer-container {
        max-width: 1200px;
        /* căn giữa nội dung */
        margin: 0 auto;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        gap: 30px;
    }

    .footer-column h3 {
        color: #fff;
        margin-bottom: 15px;
        font-size: 16px;
        border-bottom: 2px solid #e63946;
        /* gạch đỏ dưới tiêu đề */
        display: inline-block;
        padding-bottom: 5px;
    }

    .footer-column p,
    .footer-column li,
    .footer-column a {
        color: #ddd;
        line-height: 1.6;
        text-decoration: none;
    }

    .footer-column a:hover {
        color: #e63946;
        /* đỏ khi hover */
    }

    .footer-logo {
        max-width: 120px;
        margin-bottom: 10px;
    }

    .footer-column ul {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .footer-column ul li {
        margin: 6px 0;
    }

    .social-icons a {
        display: inline-block;
        margin-right: 10px;
    }

    .social-icons img {
        width: 28px;
        height: 28px;
        border-radius: 50%;
        background: #fff;
        padding: 5px;
        transition: 0.3s;
    }

    .social-icons img:hover {
        background: #e63946;
        transform: scale(1.1);
    }

    .footer-bottom {
        text-align: center;
        padding-top: 20px;
        margin-top: 30px;
        border-top: 1px solid #444;
        font-size: 13px;
        color: #aaa;
    }