/* Base styles cho menu */
.main-nav {
    width: 100%;
    transition: all 0.3s ease-in-out;
}

.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    padding: 10px;
    cursor: pointer;
    z-index: 100;
}

/* Desktop lớn */
@media screen and (min-width: 1025px) {
    .menu-toggle {
        display: none;
    }

    .main-nav {
        display: block !important;
        background: transparent;
    }

    .main-nav ul {
        display: flex;
        flex-direction: row;
        justify-content: center;
    }

    .main-nav li {
        position: relative;
    }

    .main-nav a {
        padding: 15px 20px;
        color: #fff;
        text-decoration: none;
        display: block;
        transition: all 0.3s ease;
    }
}

/* Menu mobile và tablet */
@media screen and (max-width: 1024px) {
    .header {
        position: relative;
    }

    .menu-toggle {
        display: block;
        order: -1;
        margin-right: 10px;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #2563a6;
        box-shadow: 0 4px 12px rgba(26,53,94,0.15);
        z-index: 1000;
    }

    .main-nav.active {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        width: 100%;
    }

    .main-nav li {
        width: 100%;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .main-nav li:last-child {
        border-bottom: none;
    }

    .main-nav a {
        padding: 15px 20px;
        color: #fff;
        text-decoration: none;
        display: block;
        transition: all 0.3s ease;
    }

    .main-nav a:hover,
    .main-nav a.active {
        background: rgba(255,255,255,0.1);
    }

    /* Header adjustments */
    .header-bar {
        display: flex;
        align-items: center;
        padding: 10px 20px;
        position: relative;
    }

    .header-logo {
        height: 50px;
        width: auto;
    }

    .header-title {
        flex: 1;
        padding: 0 15px;
    }

    .header-search {
        margin-left: auto;
    }
}

/* Mobile styles */
@media screen and (max-width: 768px) {
    .header-bar {
        flex-wrap: wrap;
        gap: 10px;
    }

    .header-title h1 {
        font-size: 1.5rem;
    }

    .header-title p {
        font-size: 0.9rem;
    }

    .header-search {
        width: 100%;
        order: 1;
    }

    .main-nav a {
        padding: 12px 15px;
        font-size: 0.95rem;
    }
}

/* Animation cho menu */
.main-nav.active {
    animation: slideDown 0.3s ease-in-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Fix cho menu toggle */
.menu-toggle.active .fas {
    transform: rotate(90deg);
}

/* Đảm bảo menu luôn hiển thị khi active */
.main-nav.active {
    display: block !important;
    opacity: 1;
    visibility: visible;
}

/* Overlay cho menu mobile */
.menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 999;
}

.menu-overlay.active {
    display: block;
}