/* ==========================================================================
   BS Chem Group — responsive layer (mobile-first, min-width queries)
   Base styles in style.css target small phones (320px+).
   ========================================================================== */

/* Very small phones: keep the header compact */
@media (max-width: 359px) {
  .brand__tag { display: none; }
  .brand__name { font-size: 1rem; }
  .catalog__filter-toggle span:not(.filter-count) { display: none; }
}

/* 480px+ — large phones
   ========================================================================== */
@media (min-width: 480px) {
  :root { --gutter: 1.25rem; }

  .crop-grid,
  .values-grid,
  .link-tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .hero__visual { height: 340px; }
  .hero__actions .btn { flex: 0 0 auto; }
  .hero-search__row { flex-direction: row; }
  .hero-search__row .btn { flex-shrink: 0; min-height: 52px; }

  .facts-list > div { grid-template-columns: 10rem minmax(0, 1fr); gap: var(--space-4); align-items: baseline; }
}

/* 600px+ — product cards switch to the vertical layout
   ========================================================================== */
@media (min-width: 600px) {
  .product-grid,
  .category-grid,
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .product-card { display: flex; flex-direction: column; }
  .product-card__media {
    aspect-ratio: 4 / 3;
    min-height: 0;
    padding: var(--space-5);
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
  .product-card__media img { max-height: none; }
  .product-card__body { padding: var(--space-5); gap: .5rem; }
  .product-card__title { font-size: 1.1875rem; }

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

/* 768px+ — tablets
   ========================================================================== */
@media (min-width: 768px) {
  :root {
    --gutter: 2rem;
    --header-h: 72px;
  }

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

  .section-head--split { flex-direction: row; align-items: flex-end; justify-content: space-between; }
  .section-head--split .link-arrow { flex-shrink: 0; margin-bottom: .4rem; }

  .page-hero__layout { flex-direction: row; align-items: center; gap: var(--space-8); }
  .page-hero__art { width: 96px; height: 96px; border-radius: 24px; }
  .page-hero__art img { width: 68px; height: 68px; }
  .page-hero__art .icon { width: 44px; height: 44px; }

  /* Filters always visible on tablet and up */
  .catalog__filter-toggle { display: none; }
  .catalog__filters,
  .catalog__filters.is-open {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  }

  .site-footer__grid { grid-template-columns: 1.4fr repeat(3, minmax(0, 1fr)); }
  .site-footer__brand { grid-column: auto; }
  .site-footer__bottom { flex-direction: row; align-items: center; justify-content: space-between; gap: var(--space-6); }

  .hero__visual { height: 380px; }
  .hero__orb { width: 340px; }
}

/* 1024px+ — desktop
   ========================================================================== */
@media (min-width: 1024px) {
  :root { --header-h: 76px; }

  /* Navigation: inline bar with dropdown panels */
  .menu-button,
  .site-nav__head,
  .nav-backdrop { display: none !important; }

  .site-nav,
  .site-nav.is-open {
    position: static;
    flex-direction: row;
    width: auto;
    overflow: visible;
    background: transparent;
    box-shadow: none;
    transform: none;
    visibility: visible;
    transition: none;
  }
  body.nav-open { overflow: auto; }

  .nav-list { flex-direction: row; align-items: center; gap: .15rem; padding: 0; }
  .nav-link {
    width: auto;
    min-height: 42px;
    padding: .5rem .75rem;
    font-family: var(--font-body);
    font-size: .9375rem;
    font-weight: 500;
    justify-content: center;
  }
  .nav-link:hover { background: var(--surface-alt); }
  .nav-link[aria-current="page"],
  .nav-link.is-active { background: transparent; color: var(--primary); font-weight: 600; }
  .nav-link::after {
    content: "";
    position: absolute;
    left: .75rem;
    right: .75rem;
    bottom: 3px;
    height: 2px;
    border-radius: 2px;
    background: var(--accent);
    transform: scaleX(0);
    transition: transform var(--t) var(--ease);
  }
  .nav-link[aria-current="page"]::after,
  .nav-link.is-active::after { transform: scaleX(1); }
  .nav-link .icon { width: 16px; height: 16px; }

  .nav-dropdown { position: relative; }
  .nav-dropdown__menu {
    position: absolute;
    top: calc(100% + 12px);
    left: 50%;
    display: block;
    min-width: 290px;
    padding: .5rem;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--surface);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translate(-50%, 8px);
    transition: opacity var(--t-fast), transform var(--t-fast) var(--ease), visibility 0s linear var(--t-fast);
  }
  .nav-dropdown__menu::before { content: ""; position: absolute; inset: -14px 0 auto; height: 14px; }
  .nav-dropdown.is-open .nav-dropdown__menu {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
    transition: opacity var(--t-fast), transform var(--t-fast) var(--ease), visibility 0s;
  }
  .nav-dropdown__menu--grid,
  .nav-dropdown.is-open .nav-dropdown__menu--grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2px;
    min-width: 500px;
  }
  .nav-dropdown__menu--grid > li:first-child {
    grid-column: 1 / -1;
    margin-bottom: .35rem;
    padding-bottom: .35rem;
    border-bottom: 1px solid var(--border);
  }

  .nav-list__cta { margin: 0 0 0 .75rem; padding: 0; }
  .nav-list__cta .btn { width: auto; }

  /* Home */
  .hero__inner { grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr); gap: var(--space-8); }
  .hero__visual { height: 470px; }
  .hero__orb { width: 420px; }

  .hero-search { padding: var(--space-5); }

  .about-intro { grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: clamp(3rem, 6vw, 6rem); align-items: start; }
  .about-intro__head { position: sticky; top: calc(var(--header-h) + 2rem); }

  .category-grid,
  .crop-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .category-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .product-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .feature-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .values-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .link-tiles { grid-template-columns: repeat(3, minmax(0, 1fr)); }

  .cta-band { grid-template-columns: minmax(0, 1fr) auto; gap: var(--space-10); }

  .split { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: clamp(3rem, 5vw, 5rem); align-items: start; }
  .split--even { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .company-feature { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(3rem, 5vw, 5rem); }
  .company-feature--reverse .company-feature__media { order: 2; }
  .company-feature__media { position: sticky; top: calc(var(--header-h) + 2rem); }

  .contact-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: clamp(2rem, 4vw, 4rem); align-items: start; }
  .contact-layout .contact-grid { grid-template-columns: 1fr; }
  .contact-form-card { position: sticky; top: calc(var(--header-h) + 1.5rem); }
}

/* Wide product grids only when there is room for four comfortable columns */
@media (min-width: 1200px) {
  .product-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .product-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* 1440px+ — large desktop
   ========================================================================== */
@media (min-width: 1440px) {
  :root { --container: 1280px; }
  .hero__visual { height: 520px; }
  .hero__orb { width: 460px; }
}