/* ==========================================================================
   RESPONSIVE – desktop-first (reference viewport 1280px)
   Breakpoints: 1200 · 1100 (menu mobile) · 768 · 576
   ========================================================================== */

/* ---------- ≤ 1200px: laptop nhỏ / tablet ngang ---------- */
@media (max-width: 1200px) {
    :root {
        --container-gutter: 20px;
    }

    .menu {
        gap: 15px;
    }

    .menu__link {
        font-size: 14.5px;
    }

    .menu__item--current > .menu__link {
        font-size: 16px;
    }

    .header-actions {
        gap: 8px;
        margin-left: 16px;
    }

    .header-cta {
        padding-inline: 12px 14px;
        font-size: 15px;
    }

    .site-branding__name {
        font-size: 26px;
    }

    .site-branding__tagline {
        font-size: 11.5px;
    }

    .hero__content {
        padding-left: 44px;
    }

    .process {
        grid-template-columns: repeat(5, minmax(0, 1fr));
        gap: 16px;
    }

    .process-step {
        height: auto;
        min-height: 64px;
        padding-block: 8px;
    }

    .process-step__icon {
        width: 30px;
        height: 30px;
    }

    .reviews {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .contact-strip {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    .map-card {
        grid-column: 1 / -1;
        min-height: 120px;
    }

    .footer-widget--contact {
        padding-left: 20px;
    }

    .layout-sidebar {
        grid-template-columns: minmax(0, 1fr) 280px;
        gap: 24px;
    }
}

/* ---------- ≤ 1100px: tablet – chuyển menu mobile ---------- */
@media (max-width: 1100px) {
    :root {
        --header-height: 64px;
        --section-space: 28px;
        --text-section-title: 24px;
    }

    .section__header {
        margin-bottom: 10px;
    }

    .section--services,
    .section--reviews,
    .section--contact {
        padding-top: var(--section-space);
    }

    /* Top bar: chỉ giữ hotline + mạng xã hội */
    .topbar__inner {
        justify-content: center;
        gap: 24px;
    }

    .topbar__inner > .topbar__item:first-child {
        display: none;
    }

    /* Header */
    .site-header {
        position: sticky;
        top: 0;
    }

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

    .menu-toggle {
        display: grid;
    }

    .site-navigation {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        z-index: 120;
        display: flex;
        flex-direction: column;
        width: min(340px, 86vw);
        margin: 0;
        background: #fff;
        box-shadow: var(--shadow-lg);
        transform: translateX(100%);
        visibility: hidden;
        transition: transform 0.3s ease, visibility 0.3s ease;
        overflow-y: auto;
    }

    .is-menu-open .site-navigation {
        transform: none;
        visibility: visible;
    }

    .is-menu-open {
        overflow: hidden;
    }

    /* Header (z-index 50) tạo stacking context chứa panel menu → backdrop phải nằm dưới header */
    .nav-backdrop {
        position: fixed;
        inset: 0;
        z-index: 49;
        display: block;
        background: rgba(10, 14, 20, 0.5);
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease, visibility 0.3s ease;
    }

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

    .mobile-nav__head {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 14px 16px 14px 20px;
        border-bottom: 1px solid var(--color-border);
    }

    .mobile-nav__head .site-branding__name {
        font-size: 22px;
    }

    .menu-close {
        display: grid;
        place-items: center;
        width: 40px;
        height: 40px;
        border-radius: var(--radius-sm);
        color: var(--color-heading);
    }

    .menu-close .icon {
        width: 24px;
        height: 24px;
    }

    .menu {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 8px 0;
    }

    .menu__item {
        border-bottom: 1px solid var(--color-border);
    }

    .menu__link,
    .menu__item--current > .menu__link {
        height: auto;
        padding: 13px 20px;
        font-size: 16px;
    }

    .menu__item--current > .menu__link::after {
        top: 8px;
        bottom: 8px;
        left: 0;
        right: auto;
        width: 3px;
        height: auto;
    }

    .menu__item--has-children > .menu__link .icon {
        display: none;
    }

    .submenu-toggle {
        position: absolute;
        top: 4px;
        right: 8px;
        display: grid;
        place-items: center;
        width: 40px;
        height: 40px;
        color: var(--color-heading);
    }

    .submenu-toggle .icon {
        width: 16px;
        height: 16px;
        transition: transform var(--transition);
    }

    .menu__item.is-open .submenu-toggle .icon {
        transform: rotate(180deg);
    }

    .sub-menu {
        position: static;
        display: none;
        min-width: 0;
        padding: 0 0 8px;
        border: 0;
        border-radius: 0;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
    }

    .menu__item.is-open > .sub-menu {
        display: block;
    }

    .sub-menu a {
        padding: 9px 20px 9px 36px;
        font-size: 15px;
    }

    .mobile-nav__footer {
        display: grid;
        gap: 10px;
        margin-top: auto;
        padding: 20px;
    }

    .mobile-nav__footer .btn {
        height: 46px;
    }

    /* Hero */
    .hero {
        height: auto;
        min-height: 440px;
    }

    .hero__inner {
        height: auto;
    }

    .hero__content {
        padding: 48px 0 64px 44px;
    }

    .hero__overlay {
        background: linear-gradient(90deg, rgba(8, 11, 16, 0.75) 0%, rgba(8, 11, 16, 0.55) 45%, rgba(8, 11, 16, 0.2) 80%);
    }

    .hero__slide img {
        object-position: 62% 30%;
    }

    .hero__features {
        flex-wrap: wrap;
        gap: 14px 22px;
    }

    /* Lưới */
    .grid--4 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .grid--3 {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .service-card__media,
    .case-card__media {
        aspect-ratio: 16 / 9;
    }

    .case-card__body {
        height: auto;
        min-height: 122px;
    }

    .process {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .process-step:nth-child(3)::after {
        display: none;
    }

    .why {
        grid-template-columns: minmax(0, 1fr);
    }

    .why__media img {
        aspect-ratio: 1305 / 345;
        height: auto;
    }

    .contact-strip {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    /* Footer */
    .site-footer__inner {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 28px 24px;
        padding-block: 32px;
    }

    .footer-brand {
        grid-column: 1 / -1;
    }

    .footer-brand__about {
        max-width: 520px;
    }

    .footer-widget--contact {
        padding-left: 0;
        border-left: 0;
    }

    .footer-widget--social {
        grid-column: 1 / -1;
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        justify-content: space-between;
        gap: 12px 24px;
        padding-top: 20px;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .footer-widget--social .footer-widget__title {
        margin: 0;
    }

    .footer-social {
        margin-top: 0;
    }

    .site-footer__copyright {
        align-self: center;
        margin: 0 0 0 auto;
    }

    /* Trang trong */
    .layout-sidebar {
        grid-template-columns: minmax(0, 1fr);
    }

    .sidebar {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        align-items: start;
    }

    .about-intro {
        grid-template-columns: minmax(0, 1fr);
    }

    .stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

/* ---------- ≤ 768px: tablet dọc ---------- */
@media (max-width: 768px) {
    :root {
        --text-hero-kicker: 22px;
        --text-hero-title: 50px;
        --text-hero-subtitle: 22px;
    }

    .header-cta {
        display: none;
    }

    .hero__content {
        padding: 40px 0 60px;
    }

    .hero__nav {
        top: auto;
        bottom: 8px;
        width: 36px;
        height: 36px;
        margin: 0;
    }

    .hero__nav--prev { left: 16px; }
    .hero__nav--next { right: 16px; }

    .hero__counter {
        display: none;
    }

    .hero__overlay {
        background: linear-gradient(180deg, rgba(8, 11, 16, 0.5) 0%, rgba(8, 11, 16, 0.62) 50%, rgba(8, 11, 16, 0.78) 100%);
    }

    .hero__dots {
        bottom: 20px;
    }

    .section__header {
        flex-wrap: wrap;
        row-gap: 4px;
    }

    .section__link {
        font-size: 16px;
    }

    .process {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .process-step::after,
    .process-step:nth-child(3)::after {
        display: none;
    }

    .reviews {
        grid-template-columns: minmax(0, 1fr);
    }

    .site-footer__inner {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .footer-widget--contact {
        grid-column: 1 / -1;
    }

    .page-header__title,
    .entry__title {
        font-size: 28px;
    }

    .entry {
        padding: 22px 20px 24px;
    }

    .entry-content {
        font-size: 16px;
    }

    .entry-content h2 {
        font-size: 23px;
    }

    .entry-content h3 {
        font-size: 19px;
    }

    .sidebar {
        grid-template-columns: minmax(0, 1fr);
    }

    .search-result {
        grid-template-columns: 160px minmax(0, 1fr);
    }

    .contact-form {
        grid-template-columns: minmax(0, 1fr);
        padding: 18px;
    }
}

/* ---------- ≤ 576px: mobile ---------- */
@media (max-width: 576px) {
    :root {
        --container-gutter: 16px;
        --header-height: 60px;
        --section-space: 26px;
        --text-section-title: 22px;
        --text-hero-kicker: 18px;
        --text-hero-title: 40px;
        --text-hero-subtitle: 18px;
    }

    .topbar {
        display: none;
    }

    .site-branding__logo {
        width: 44px;
        height: 44px;
    }

    .site-branding__name {
        font-size: 22px;
    }

    .site-branding__tagline {
        font-size: 10.5px;
    }

    .header-actions {
        gap: 2px;
    }

    .hero__content {
        padding: 30px 0 64px;
    }

    .hero__title {
        margin-top: 8px;
    }

    .hero__subtitle br {
        display: none;
    }

    .hero__subtitle {
        margin-top: 6px;
    }

    .hero__features {
        flex-direction: column;
        gap: 10px;
        margin-top: 18px;
    }

    .hero-feature__icon {
        width: 40px;
        height: 40px;
    }

    .hero-feature__icon .icon {
        width: 22px;
        height: 22px;
    }

    .hero__actions {
        display: grid;
        grid-template-columns: minmax(0, 1fr);
        gap: 10px;
    }

    .contact-btn {
        height: 54px;
    }

    .grid--4,
    .grid--3,
    .grid--2 {
        grid-template-columns: minmax(0, 1fr);
    }

    .section__title {
        letter-spacing: 0;
    }

    .process {
        grid-template-columns: minmax(0, 1fr);
        gap: 10px;
    }

    .why__media img {
        aspect-ratio: 16 / 9;
    }

    .why__features {
        grid-template-columns: minmax(0, 1fr);
    }

    .rating-summary {
        justify-content: center;
    }

    .contact-strip {
        grid-template-columns: minmax(0, 1fr);
    }

    .contact-box__text + .contact-box__label,
    .contact-box__text {
        font-size: 13.5px;
    }

    .map-card {
        min-height: 150px;
    }

    .site-footer__inner {
        grid-template-columns: minmax(0, 1fr);
        gap: 22px;
    }

    .footer-widget--social {
        flex-direction: column;
        align-items: flex-start;
    }

    .site-footer__copyright {
        margin: 0;
        align-self: flex-start;
        white-space: normal;
    }

    .page-header {
        padding-block: 20px 22px;
    }

    .page-header__title,
    .entry__title {
        font-size: 24px;
    }

    .page-body {
        padding-block: 22px 36px;
    }

    .search-hero {
        flex-direction: column;
    }

    .search-hero .form-control {
        flex: none;
    }

    .search-result {
        grid-template-columns: minmax(0, 1fr);
        gap: 12px;
    }

    .stats {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .stat__value {
        font-size: 28px;
    }

    .entry__thumbnail img {
        aspect-ratio: 16 / 10;
    }
}