/* ============================================================
   HEADER.CSS - Header, Navigation, Hamburger Menu
   ============================================================ */

/* Header Container */
.header {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    background: white;
    box-shadow: var(--bong-sm);
    z-index: var(--z-fixed);
    padding-top: var(--safe-area-top);
}

.header__container {
    max-width: 94%;
    margin: 0 auto;
    padding: var(--khoang-cach-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--khoang-cach-md);
}

/* Logo */
.header__logo {
    display: flex;
    align-items: center;
    gap: var(--khoang-cach-sm);
    flex-shrink: 0;
    cursor: pointer;
}

.logo__img {
    width: 44px;
    height: 44px;
    border-radius: var(--bo-goc-md);
    object-fit: cover;
}

.logo__text {
    display: none;
}

.logo__title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--mau-chu-chinh);
    margin: 0;
    line-height: 1.2;
}

.logo__subtitle {
    font-size: var(--font-size-xs);
    color: var(--mau-chu-phu);
    margin: 0;
    line-height: 1.2;
}

/* Search Box trong Header (Mobile) */
.header__search {
    display: flex;
    align-items: center;
    background: var(--mau-nen-xam);
    border-radius: var(--bo-goc-full);
    padding: 8px 16px;
    gap: 8px;
    flex: 1;
    max-width: 500px;
    margin: 0 ;
}

.header__search i {
    color: var(--mau-chu-phu);
    font-size: var(--font-size-sm);
}

.header__search input {
    border: none;
    background: transparent;
    outline: none;
    width: 100%;
    font-size: var(--font-size-sm);
}

@media (min-width: 1024px) {
    .logo__img {
        width: 50px;
        height: 50px;
    }
    
    .logo__text {
        display: block;
    }
    
    .header__search {
        display: none;
    }
}

/* Navigation */
.nav {
    display: none;
}

.nav__list {
    display: flex;
    gap: var(--khoang-cach-xs);
    justify-content: start;
}

.nav__item {
    list-style: none;
}

.nav__item a {
    font-size: var(--font-size-base);
    gap: 5px;
}

.nav__link {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--khoang-cach-sm) var(--khoang-cach-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--mau-chu-chinh);
    border-radius: var(--bo-goc-md);
    transition: all var(--chuyen-canh-nhanh);
    cursor: pointer;
    white-space: nowrap;
}

.nav__link:hover {
    background-color: var(--mau-nen-xam);
    color: var(--mau-chinh);
}

.nav__link--active {
    background-color: var(--mau-chinh);
    color: white;
}

.nav__link--active:hover {
    background-color: #0557d0;
    color: white;
}

.nav__item--admin {
    display: flex !important;
}

/* Show navigation on tablet+ */
@media (min-width: 1024px) {
    .nav {
        display: flex;
        flex: 1;
        justify-content: center;
    }
}

/* Header Actions */
.header__actions {
    display: flex;
    align-items: center;
    gap: var(--khoang-cach-sm);
}

/* Account */
.account {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--khoang-cach-sm);
    padding: var(--khoang-cach-xs) var(--khoang-cach-sm);
    border-radius: var(--bo-goc-md);
    cursor: pointer;
    transition: all var(--chuyen-canh-nhanh);
    min-height: 44px;
}

.account:hover {
    background-color: var(--mau-nen-xam);
}

.account__avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--bo-goc-full);
    object-fit: cover;
}

.account__name {
    display: none;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--mau-chu-chinh);
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

@media (min-width: 1024px) {
    .account__avatar {
        width: 40px;
        height: 40px;
    }
    
    .account__name {
        display: block;
    }
}

/* Account Dropdown */
.account__dropdown {
    position: absolute;
    top: calc(100% + var(--khoang-cach-sm));
    right: 0;
    min-width: 200px;
    background: white;
    border-radius: var(--bo-goc-md);
    box-shadow: var(--bong-lg);
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--chuyen-canh-nhanh);
    z-index: var(--z-dropdown);
}

.account:hover .account__dropdown,
.account__dropdown--active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown__item {
    display: flex;
    align-items: center;
    padding: var(--khoang-cach-md);
    font-size: var(--font-size-sm);
    color: var(--mau-chu-chinh);
    transition: all var(--chuyen-canh-nhanh);
    cursor: pointer;
    min-height: 44px;
}

.dropdown__item:hover {
    background-color: var(--mau-nen-xam);
    color: var(--mau-chinh);
}

.dropdown__item:last-child {
    border-top: 1px solid var(--mau-vien);
    color: var(--mau-loi);
}

.dropdown__item:last-child:hover {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--mau-loi);
}

/* Hamburger Menu Button */
.hamburger-wrapper {
    position: relative;
    width: 44px;
    height: 44px;
    flex-shrink: 0;
}

.btn-hamburger-placeholder {
    display: none;
}

.btn-hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    width: 44px;
    height: 44px;
    padding: 12px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.hamburger__line {
    width: 24px;
    height: 2px;
    background-color: var(--mau-chu-chinh);
    border-radius: 2px;
    transition: all var(--chuyen-canh-trung-binh);
}

.btn-hamburger.active .hamburger__line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.btn-hamburger.active .hamburger__line:nth-child(2) {
    opacity: 0;
}

.btn-hamburger.active .hamburger__line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

@media (min-width: 1024px) {
    .hamburger-wrapper,
    .btn-hamburger {
        display: none;
    }
}
.nav__login {
    display: none;
}

/* Nav Account (Mobile Sidebar) */
.nav__account {
    display: none;
}

/* Nav Online Count */
.nav__online {
    display: none;
}

/* ============================================================
   MOBILE SIDEBAR 
   ============================================================ */
@media (max-width: 1023px) {
    /* An nut dang nhap va account tren header */
    #btnLogin,
    #accountMenu,
    .header__actions {
        display: none !important;
    }
    
    /* Sidebar */
    .nav {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        right: 0;
        width: 260px;
        max-width: 300px;
        height: 100vh;
        background: white;
        z-index: 1000;
        transform: translateX(100%);
        transition: transform var(--chuyen-canh-trung-binh);
        overflow-y: auto;
        padding: var(--khoang-cach-md);
        padding-top: 70px;
        padding-bottom: calc(var(--khoang-cach-md) + var(--safe-area-bottom));
        box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
    }
    
    .nav--active {
        transform: translateX(0);
    }
    
    .nav__list {
        flex-direction: column;
        gap: var(--khoang-cach-sm);
        flex: 1;
    }
    
    .nav__link {
        width: 100%;
        padding: var(--khoang-cach-sm) var(--khoang-cach-md);
        font-size: var(--font-size-sm);
        justify-content: flex-start;
        border-radius: var(--bo-goc-lg);
        gap: var(--khoang-cach-sm);
    }
    
    .nav__link i {
        width: 18px;
        text-align: center;
        color: var(--mau-chu-phu);
        font-size: var(--font-size-sm);
    }
    
    .nav__link--active i {
        color: var(--mau-chinh);
    }
    
    .nav__link--active {
        background-color: rgba(7, 104, 240, 0.1);
        color: var(--mau-chinh);
    }
    
    .nav__link--active:hover {
        background-color: rgba(7, 104, 240, 0.15);
        color: var(--mau-chinh);
    }
    
    /* Nut dang nhap trong sidebar */
    .nav__login {
        display: block;
        margin-bottom: var(--khoang-cach-md);
        padding-bottom: var(--khoang-cach-md);
        border-bottom: 1px solid var(--mau-vien);
    }
    
    .nav__login .btn {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: center;
        gap: var(--khoang-cach-sm);
        font-size: var(--font-size-sm);
        min-height: 42px;
    }
    
    /* Account trong sidebar */
    .nav__account {
        display: block;
        margin-bottom: var(--khoang-cach-md);
        padding-bottom: var(--khoang-cach-md);
        border-bottom: 1px solid var(--mau-vien);
    }
    
    .nav__account-info {
        display: flex;
        align-items: center;
        gap: var(--khoang-cach-sm);
        margin-bottom: var(--khoang-cach-sm);
    }
    
    .nav__avatar {
        width: 44px;
        height: 44px;
        border-radius: 50%;
        object-fit: cover;
        border: 2px solid var(--mau-chinh);
    }
    
    .nav__account-detail {
        display: flex;
        flex-direction: column;
    }
    
    .nav__username {
        font-weight: 600;
        font-size: var(--font-size-sm);
        color: var(--mau-chu-chinh);
    }
    
    .nav__role {
        font-size: var(--font-size-xs);
        color: var(--mau-chu-phu);
    }
    
    .nav__account-actions {
        display: flex;
        flex-direction: column;
        gap: var(--khoang-cach-xs);
    }
    
    .nav__account-btn {
        display: flex;
        align-items: center;
        gap: var(--khoang-cach-xs);
        padding: var(--khoang-cach-xs) var(--khoang-cach-sm);
        background: var(--mau-nen-xam);
        border: none;
        border-radius: var(--bo-goc-md);
        font-size: var(--font-size-xs);
        color: var(--mau-chu-chinh);
        cursor: pointer;
        transition: all var(--chuyen-canh-nhanh);
    }
    
    .nav__account-btn:hover {
        background: var(--mau-vien);
    }
    
    .nav__account-btn i {
        width: 16px;
        text-align: center;
        color: var(--mau-chu-phu);
    }
    
    .nav__account-btn--logout {
        color: var(--mau-loi);
        background: rgba(239, 68, 68, 0.1);
    }
    
    .nav__account-btn--logout:hover {
        background: rgba(239, 68, 68, 0.2);
    }
    
    .nav__account-btn--logout i {
        color: var(--mau-loi);
    }
    
    /* Online count */
    .nav__online {
        display: flex;
        align-items: center;
        gap: var(--khoang-cach-xs);
        padding: var(--khoang-cach-sm);
        margin-top: auto;
        background: var(--mau-nen-xam);
        border-radius: var(--bo-goc-md);
        font-size: var(--font-size-xs);
        color: var(--mau-chu-phu);
    }
    
    .nav__online-dot {
        font-size: 8px;
        color: var(--mau-thanh-cong);
        animation: pulse 2s infinite;
    }
    
    @keyframes pulse {
        0%, 100% { opacity: 1; }
        50% { opacity: 0.5; }
    }
    
    .nav__online strong {
        color: var(--mau-chu-chinh);
    }
    
    /* Placeholder giữ chỗ khi hamburger di chuyển */
    .btn-hamburger-placeholder {
        display: block;
        width: 44px;
        height: 44px;
        visibility: hidden;
    }
    
    .btn-hamburger {
        position: absolute;
        top: 0;
        right: 0;
        background: white;
        border-radius: var(--bo-goc-md);
        box-shadow: var(--bong-md);
        transition: all var(--chuyen-canh-cham);
    }

    .btn-hamburger.active {
        position: fixed;
        top: var(--khoang-cach-md);
        transition: all var(--chuyen-canh-trung-binh);
        z-index: 10000;
        right: 200px;
        box-shadow: none;
    }
}

/* Backdrop */
.nav-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity var(--chuyen-canh-trung-binh);
}

.nav-backdrop--active {
    display: block;
    opacity: 1;
}

@media (min-width: 1024px) {
    .nav-backdrop {
        display: none !important;
    }
}