/* ==========================================================================
   International Paint Warba — Responsive
   responsive.css  ·  breakpoint behaviour, mobile navigation drawer
   Load after style.css and components.css.

   Breakpoints
     1440+   full desktop
     1300    compact desktop nav
     1140    navigation collapses to the drawer
      991    two-column grids collapse
      767    single column
      575    small phones
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Large desktop
   -------------------------------------------------------------------------- */

@media (min-width: 1600px) {
    :root {
        --gutter: 2rem;
    }
}

/* --------------------------------------------------------------------------
   2. Compact desktop navigation (1140–1299)
   -------------------------------------------------------------------------- */

@media (max-width: 1299px) {
    .nav__link {
        padding: var(--sp-3) 0.6875rem;
        font-size: 0.875rem;
    }

    .nav__link::after {
        left: 0.6875rem;
        right: 0.6875rem;
    }

    .brand img {
        width: 190px;
        height: 49px;
    }

    :root {
        --header-bar-h: 76px;
    }
}

/* --------------------------------------------------------------------------
   3. Navigation drawer (below 1140)
   -------------------------------------------------------------------------- */

@media (max-width: 1139px) {
    .nav-toggle {
        display: inline-flex;
    }

    .nav {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        z-index: 110;
        width: min(370px, 88vw);
        padding: 0 0 var(--sp-6);
        background: var(--paper);
        box-shadow: -12px 0 40px rgba(12, 20, 32, 0.2);
        overflow-y: auto;
        overscroll-behavior: contain;
        transform: translateX(102%);
        visibility: hidden;
        transition: transform var(--dur) var(--ease), visibility var(--dur) var(--ease);
    }

    .nav.is-open {
        transform: translateX(0);
        visibility: visible;
    }

    .nav__panel-head {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: var(--sp-4);
        padding: var(--sp-4) var(--sp-5);
        border-bottom: 1px solid var(--border-color);
        background: var(--light-color);
    }

    .nav__panel-title {
        font-family: var(--font-mono);
        font-size: var(--fs-eyebrow);
        font-weight: 600;
        letter-spacing: 0.16em;
        text-transform: uppercase;
        color: var(--steel-600);
    }

    .nav__close {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        padding: 0;
        border: 1px solid var(--border-color);
        border-radius: var(--radius);
        background: var(--paper);
        color: var(--primary-color);
        cursor: pointer;
    }

    .nav__close svg {
        width: 18px;
        height: 18px;
    }

    .nav__list {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: var(--sp-3) var(--sp-4);
    }

    .nav__item {
        border-bottom: 1px solid var(--steel-100);
    }

    .nav__item:last-child {
        border-bottom: 0;
    }

    .nav__link {
        display: flex;
        width: 100%;
        justify-content: space-between;
        padding: var(--sp-4) var(--sp-3);
        font-size: 1rem;
    }

    .nav__link::after {
        display: none;
    }

    .nav__link.is-current {
        color: var(--primary-color);
        box-shadow: inset 3px 0 0 var(--accent-color);
    }

    /* Dropdown becomes an in-flow accordion */
    .nav__dropdown {
        position: static;
        min-width: 0;
        margin: 0 0 var(--sp-2);
        padding: 0 0 0 var(--sp-4);
        border: 0;
        border-left: 2px solid var(--border-color);
        border-radius: 0;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--dur) var(--ease);
    }

    .nav__dropdown::before {
        display: none;
    }

    .nav__item--open .nav__dropdown {
        max-height: 320px;
    }

    .nav__dropdown a {
        padding: var(--sp-3);
        font-size: 0.9375rem;
    }
}

/* --------------------------------------------------------------------------
   4. Tablet (below 992)
   -------------------------------------------------------------------------- */

@media (max-width: 991px) {
    :root {
        --sp-10: 4rem;
    }

    .grid--split,
    .grid--2 {
        grid-template-columns: minmax(0, 1fr);
        gap: var(--sp-7);
    }

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

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

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

    .footer__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: var(--sp-7);
    }

    .footer__grid > :first-child {
        grid-column: 1 / -1;
    }

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

    .header-utility__inner {
        justify-content: center;
        gap: var(--sp-4);
    }

    .cta-band__inner {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* --------------------------------------------------------------------------
   5. Mobile (below 768)
   -------------------------------------------------------------------------- */

@media (max-width: 767px) {
    :root {
        --gutter: 1.25rem;
        --sp-9: 3rem;
        --sp-10: 3.25rem;
    }

    .section {
        padding-block: var(--sp-10);
    }

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

    .gallery-grid {
        gap: var(--sp-3);
    }

    .hero {
        min-height: 0;
    }

    .hero__inner {
        padding-block: var(--sp-9) var(--sp-8);
    }

    .hero__actions .btn,
    .btn-row .btn {
        flex: 1 1 100%;
    }

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

    .prose--justify p,
    .brand-card__body {
        text-align: left;
        hyphens: manual;
    }

    .table-hint {
        display: block;
    }

    .spec-table thead th,
    .spec-table tbody td {
        padding: var(--sp-3) var(--sp-4);
    }

    .doc-card {
        gap: var(--sp-4);
    }

    .doc-card .btn {
        width: 100%;
    }

    .doc-viewer {
        height: 60vh;
    }

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

    .footer__bar-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .lightbox__prev {
        left: var(--sp-3);
    }

    .lightbox__next {
        right: var(--sp-3);
    }

    .to-top {
        right: var(--sp-4);
        bottom: var(--sp-4);
    }
}

/* --------------------------------------------------------------------------
   6. Small phones (below 576)
   -------------------------------------------------------------------------- */

@media (max-width: 575px) {
    .header-utility__item:not(:first-child) {
        display: none;
    }

    .header-utility__inner {
        justify-content: flex-start;
    }

    .brand img {
        width: 168px;
        height: 44px;
    }

    :root {
        --header-bar-h: 68px;
        --header-bar-h-condensed: 60px;
    }

    .detail-list {
        grid-template-columns: minmax(0, 1fr);
        gap: var(--sp-1) 0;
    }

    .detail-list dd {
        margin-bottom: var(--sp-3);
    }

    .detail-list dd:last-child {
        margin-bottom: 0;
    }

    .footer__details {
        grid-template-columns: minmax(0, 1fr);
        gap: var(--sp-1) 0;
    }

    .footer__details dd {
        margin-bottom: var(--sp-3);
    }

    .detail-card,
    .form-card,
    .doc-card {
        padding: var(--sp-5);
    }

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

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

    .certificate__frame {
        padding: var(--sp-3);
    }
}

/* --------------------------------------------------------------------------
   7. Very small phones (below 380)
   -------------------------------------------------------------------------- */

@media (max-width: 379px) {
    :root {
        --gutter: 1rem;
    }

    .brand img {
        width: 150px;
        height: 39px;
    }
}

/* --------------------------------------------------------------------------
   8. Coarse pointers — hover effects must not gate content
   -------------------------------------------------------------------------- */

@media (hover: none) {
    .gallery-item__zoom {
        opacity: 1;
        transform: none;
    }

    .brand-strip__cell img {
        filter: none;
        opacity: 1;
    }

    .brand-card::before {
        transform: scaleX(1);
    }
}