/* ============================================
   iPhone Xịn — Homepage Styles
   Apple/Google Store–inspired clean UI
   ============================================ */

/* ---- Header ---- */
.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: var(--color-bg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.site-header.is-scrolled {
    box-shadow: var(--shadow-md);
}

.site-header.is-hidden {
    transform: translateY(-100%);
}

/* Top Bar */
.header__top-bar {
    background: var(--color-primary);
    color: var(--color-text-white);
    font-size: var(--font-size-xs);
    padding: 6px 0;
    display: none;
}

.top-bar__content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-bar__contact {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.top-bar__link {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--color-text-white);
    opacity: 0.9;
}

.top-bar__link:hover {
    opacity: 1;
}

.top-bar__social {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.top-bar__social-link {
    color: var(--color-text-white);
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.top-bar__social-link:hover {
    opacity: 1;
}

/* Main Header */
.header__main {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border-light);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

/* Logo */
.header__logo .logo-link {
    display: flex;
    align-items: center;
}

.logo-text {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-text__icon {
    font-size: var(--font-size-xl);
}

.logo-text__name {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-secondary);
}

/* Nav */
.header__nav {
    display: none;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0;
}

.nav-menu li {
    position: relative;
}

.nav-menu li a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    position: relative;
    transition: color var(--transition-fast);
}

.nav-menu li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: var(--space-md);
    right: var(--space-md);
    height: 2px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.nav-menu li a:hover,
.nav-menu li.current-menu-item a,
.nav-menu li.current_page_item a {
    color: var(--color-primary);
}

.nav-menu li a:hover::after,
.nav-menu li.current-menu-item a::after,
.nav-menu li.current_page_item a::after {
    transform: scaleX(1);
}

/* Mega Menu (Sub-menu) */
.nav-menu li.menu-item-has-children > .sub-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(15px);
    background: var(--color-bg);
    min-width: 240px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    padding: var(--space-sm) 0;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1); /* Smooth slide up & fade */
    z-index: 100;
}

/* Hiệu ứng xuất hiện mượt mà khi hover */
.nav-menu li.menu-item-has-children:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.nav-menu .sub-menu li {
    width: 100%;
}

.nav-menu .sub-menu li a {
    padding: 10px var(--space-md);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    display: flex;
    align-items: center;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

/* Bỏ gạch chân của sub-menu */
.nav-menu .sub-menu li a::after {
    display: none;
}

.nav-menu .sub-menu li a:hover {
    background-color: var(--color-bg-alt);
    color: var(--color-primary);
}

/* Mega Menu Structure */
.nav-menu li.mega-menu-parent > .sub-menu.mega-menu-container {
    width: 600px;
    max-width: 90vw;
    padding: var(--space-md);
    left: 50%;
    transform: translateX(-50%) translateY(15px);
}

.nav-menu li.mega-menu-parent:hover > .sub-menu.mega-menu-container {
    transform: translateX(-50%) translateY(0);
}

.mega-menu-grid {
    display: flex;
    gap: var(--space-md);
    justify-content: space-between;
}

.mega-menu-col {
    flex: 1;
}

.mega-menu-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--space-sm);
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mega-menu-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mega-menu-col ul li a {
    padding: 8px 0;
    color: var(--color-text);
    transition: color var(--transition-fast);
    background: transparent;
}

.mega-menu-col ul li a:hover {
    color: var(--color-primary);
    background: transparent;
}

/* Mũi tên chỉ xuống cho menu cha */
.nav-menu li.menu-item-has-children > a {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.nav-menu li.menu-item-has-children > a::before {
    content: 'keyboard_arrow_down';
    font-family: 'Material Symbols Outlined';
    font-size: 18px;
    font-weight: normal;
    order: 2;
    transition: transform 0.3s ease;
}

.nav-menu li.menu-item-has-children:hover > a::before {
    transform: rotate(180deg);
}

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

.header__cta {
    display: none;
}

/* Hamburger */
.header__menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
}

.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 24px;
}

.hamburger__line {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-secondary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.mobile-menu.is-open {
    opacity: 1;
    visibility: visible;
}

.mobile-menu__inner {
    position: absolute;
    top: 0;
    right: 0;
    width: 85%;
    max-width: 360px;
    height: 100%;
    background: var(--color-bg);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.mobile-menu.is-open .mobile-menu__inner {
    transform: translateX(0);
}

.mobile-menu__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border-light);
}

.mobile-menu__close {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
}

.mobile-menu__nav {
    flex: 1;
    padding: var(--space-md);
}

.mobile-menu__nav li {
    border-bottom: 1px solid var(--color-border-light);
}

.mobile-menu__nav li a {
    display: block;
    padding: var(--space-md) 0;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
}

.mobile-menu__nav li a:hover {
    color: var(--color-primary);
}

.mobile-menu__contact {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    border-top: 1px solid var(--color-border-light);
}

/* ---- Hero ---- */
.hero {
    position: relative;
    overflow: hidden;
}

.hero__slider {
    position: relative;
    height: 80vh;
    min-height: 400px;
}

.hero__slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.6s ease;
    display: flex;
    align-items: center;
}

.hero__slide.is-active {
    opacity: 1;
    z-index: 1;
}

.hero__bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #0b57d0 0%, #0842a0 40%, #1d1d1f 100%);
    background-size: cover;
    background-position: center;
}

.hero__overlay {
    display: none;
}

.hero__content {
    position: relative;
    z-index: 2;
    color: var(--color-text-white);
    max-width: 100%;
    width: 100%;
    padding: 0 var(--space-md);
    margin: 0 auto;
    text-align: center;
}

.hero__title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-md);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.hero__subtitle {
    font-size: var(--font-size-base);
    opacity: 0.9;
    margin-bottom: var(--space-lg);
    line-height: var(--line-height-relaxed);
}

.hero__cta {
    display: inline-flex;
}

/* Hero Controls */
.hero__arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 3;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-white);
    transition: all var(--transition-base);
}

.hero__arrow:hover {
    background: rgba(255, 255, 255, 0.3);
}

.hero__arrow--prev { left: var(--space-md); }
.hero__arrow--next { right: var(--space-md); }

.hero__dots {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    gap: var(--space-sm);
}

.hero__dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.4);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.hero__dot.is-active {
    background: var(--color-text-white);
    width: 28px;
}

/* ---- Products Grid ---- */
.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

/* ---- Blog Grid ---- */
.blog-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
}

/* ---- Why Choose Us ---- */
.why-us__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.why-us__item {
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
    background: var(--color-bg);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-base);
}

.why-us__item:hover {
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.why-us__icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-md);
    background: var(--color-primary-surface);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.why-us__icon .material-symbols-outlined {
    font-size: 32px;
    color: var(--color-primary);
}

.why-us__title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    color: var(--color-secondary);
    margin-bottom: var(--space-sm);
}

.why-us__desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
}

/* ---- CTA Section ---- */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
}

.cta-section__inner {
    text-align: center;
    padding: var(--space-xl) 0;
}

.cta-section__title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-sm);
}

.cta-section__desc {
    font-size: var(--font-size-base);
    opacity: 0.9;
    margin-bottom: var(--space-xl);
}

.cta-section__actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.cta-section .btn--zalo {
    background-color: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.cta-section .btn--zalo:hover {
    background-color: rgba(255, 255, 255, 0.35);
}

.cta-section .btn--phone {
    background-color: var(--color-text-white);
    color: var(--color-primary);
}

.cta-section .btn--phone:hover {
    background-color: rgba(255, 255, 255, 0.9);
}

/* ---- Footer ---- */
.site-footer {
    background: var(--color-secondary);
    color: var(--color-text-white);
}

.footer__main {
    padding: var(--space-2xl) 0;
}

.footer__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-xl);
}

.footer__logo {
    margin-bottom: var(--space-md);
}

.footer__desc {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-md);
}

.footer__social {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.footer__social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 44px;
    padding: 0 16px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-white);
    font-size: var(--font-size-sm);
    transition: background-color var(--transition-fast);
    white-space: nowrap;
}

.footer__social-link:hover {
    background: var(--color-primary);
}

.footer__title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-md);
    position: relative;
    padding-bottom: var(--space-sm);
}

.footer__title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--color-primary);
}

.footer__menu li {
    margin-bottom: var(--space-sm);
}

.footer__menu li a {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.footer__menu li a:hover {
    color: var(--color-primary-light);
}

.footer__contact li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
}

.footer__contact li .material-symbols-outlined {
    flex-shrink: 0;
    color: var(--color-primary-light);
}

.footer__contact li svg {
    flex-shrink: 0;
    margin-top: 2px;
    color: var(--color-primary-light);
}

.footer__contact li a {
    color: rgba(255, 255, 255, 0.7);
}

.footer__contact li a:hover {
    color: var(--color-primary-light);
}

.footer__bottom {
    padding: var(--space-md) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
}

/* ---- Floating CTA (initial hidden) ---- */
.floating-cta {
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-base);
    pointer-events: none;
}

.floating-cta.is-visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

/* ---- Scroll Animations ---- */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}