/* ==================== HEADER ==================== */
.header {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px 30px;
    background-color: #ffffff;
    position: relative;
}

/* Logo */
.logo-container {
    position: absolute;
    left: 30px;
    top: 10px;
}
.logo {
    height: 50px;
}

/* ==================== MENU CHÍNH ==================== */
.main-menu {
    background-color: #f2f2f2; /* màu nền khói */
    border-radius: 12px;
    padding: 10px 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
    margin-bottom: 50px;
}

/* Danh sách menu */
.main-menu > ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
}

/* Mục menu cấp 1 */
.main-menu > ul > li {
    position: relative;
    margin: 0 12px;
}

/* Link menu */
.main-menu ul li a {
    display: block;
    padding: 10px 15px;
    color: #000;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s, color 0.3s;
    border-radius: 6px;
}

/* Hover menu */
.main-menu ul li a:hover {
    background-color: #0292f9b4;
    color: #fff;
}

/* Mục đang active */
.main-menu > ul > li.active > a,
.main-menu .active a {
    background-color: #cdd8e4;
    color: #000;
    border-radius: 8px;
    padding: 6px 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

/* ==================== SUBMENU ==================== */
.submenu {
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s ease;
    position: absolute;
    top: 100%;
    left: 0;
    background: #ffffff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    min-width: 250px;
    z-index: 1000;
    border-radius: 6px;
    padding: 10px 0;
}

.submenu li a {
    padding: 10px 20px;
    color: #000;
    font-weight: normal;
    display: block;
    transition: background-color 0.2s;
}

.submenu li a:hover {
    background-color: #f0f0f0;
}

/* Hover để hiển thị submenu trên PC */
.has-submenu:hover .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* ==================== MENU TOGGLE ==================== */
.menu-toggle {
    display: none;
    font-size: 30px;
    cursor: pointer;
    background: none;
    border: none;
    color: #000;
    position: absolute;
    right: 30px;
    top: 20px;
    z-index: 1100;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .main-menu {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        right: 0;
        width: 100%;
        background-color: #fff;
        padding: 15px 20px;
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
        z-index: 1000;
    }

    .main-menu.show {
        display: flex;
    }

    .main-menu > ul {
        flex-direction: column;
        padding-left: 0;
    }

    .main-menu > ul > li {
        margin: 10px 0;
    }

    .submenu {
        display: none;
        position: relative;
        opacity: 1 !important;
        visibility: visible !important;
        transform: none !important;
        box-shadow: none;
        padding-left: 15px;
        background: transparent;
    }

    .submenu.show {
        display: flex;
        flex-direction: column;
    }
}

/* ==================== HÌNH ẢNH ==================== */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ==================== TEXT MOBILE ==================== */
@media (max-width: 480px) {
    body {
        font-size: 14px;
        padding: 5px;
    }

    h1, h2, h3 {
        font-size: 1.2em;
    }

    .button, button, input, select {
        width: 100%;
        margin-bottom: 10px;
    }

    .hide-on-mobile {
        display: none !important;
    }
}