/* ==========================================================================
   DARKLIGHT FX — breakpoint enhancements (mobile-first: min-width only)
   560px small tablets · 768px tablets · 1024px desktop nav · 1200px wide
   ========================================================================== */

@media (min-width: 560px) {
  :root { --gutter: 24px; }
  .form-row--2 { grid-template-columns: 1fr 1fr; }
  .ui-kpis { grid-template-columns: repeat(4, minmax(0,1fr)); }
  .ui-search { display: block; }
  .kanban { grid-template-columns: repeat(4, minmax(0,1fr)); }
  .calc__options { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .ui-table .hide-sm { display: table-cell; }
  .arch__nodes { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .eco-grid, .grid--2, .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .feature-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .related { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .facts { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .contrast { grid-template-columns: 1fr 1fr; }
  .process { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .footer-bottom { grid-template-columns: 1fr auto; align-items: center; }
  .footer-bottom .footer-disclaimer { grid-column: 1 / -1; }
  .cta-band__inner { padding: 52px 44px; }
  .form-card { padding: 32px; }
  .ui-float {
    display: block; position: absolute; right: -12px; bottom: 28px; width: 210px;
    background: #202020; border: 1px solid var(--border); border-radius: 12px; padding: 12px;
    box-shadow: 0 20px 40px -12px rgba(0,0,0,.7); font-size: 11px;
  }
}

@media (min-width: 768px) {
  :root { --section: 128px; }
  .ui-body { grid-template-columns: 168px minmax(0, 1fr); }
  .ui-side { display: block; }
  .ui-grid--2-1 { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); }
  .ui-grid--1-1 { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .ui-main { padding: 16px; }
  .split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; }
  .split--wide-visual { grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); }
  .split--reverse > :first-child { order: 2; }
  .tabs__panel { grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 48px; }
  .page-hero { padding: 48px 0 80px; }
  .hero { padding: 72px 0 var(--section); }
  .post-card--featured { grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); }
  .post-card--featured .post-card__art { aspect-ratio: auto; border-bottom: 0; border-right: 1px solid var(--border); }
  .post-card--featured .post-card__body { padding: 36px; align-self: center; }
  .grid--3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .facts { grid-template-columns: repeat(4, minmax(0,1fr)); }
  .process { grid-template-columns: repeat(3, minmax(0,1fr)); }
}

@media (min-width: 1024px) {
  :root { --header-h: 60px; }
  .nav-toggle { display: none; }
  .header-cta { display: inline-flex; }
  .no-js .header-bar { height: var(--header-h); padding: 0; flex-wrap: nowrap; }
  .no-js .site-nav { width: auto; }

  /* Desktop navigation */
  .site-nav, .js .site-nav {
    position: static; inset: auto; visibility: visible; opacity: 1; transform: none;
    background: none; border: 0; padding: 0; overflow: visible; display: block;
  }
  .nav-list { display: flex; align-items: center; gap: 2px; }
  .nav-item { border: 0; position: relative; }
  .nav-link, .nav-trigger {
    padding: 8px 12px; font-size: .92rem; font-weight: 600; color: var(--text-2); border-radius: 8px;
    transition: color .15s, background-color .15s;
  }
  .nav-link:hover, .nav-trigger:hover, .nav-trigger[aria-expanded="true"] { color: var(--text); background: rgba(255,255,255,.04); }
  .nav-trigger svg { width: 14px; height: 14px; }
  .nav-cta { display: none; }

  .dropdown, .js .dropdown {
    display: block; position: absolute; top: calc(100% + 10px); left: -12px; z-index: 10;
    width: 640px; padding: 14px; border-radius: 16px; background: #222; border: 1px solid var(--border);
    box-shadow: 0 30px 60px -20px rgba(0,0,0,.8);
    visibility: hidden; opacity: 0; transform: translateY(6px);
    transition: opacity .18s var(--ease), transform .18s var(--ease), visibility 0s linear .18s;
  }
  .dropdown::before { content: ""; position: absolute; left: 0; right: 0; top: -12px; height: 12px; }
  .dropdown--sm, .js .dropdown--sm { width: 340px; }
  .dropdown__grid { grid-template-columns: 1fr 1fr; gap: 4px; }
  .dropdown--sm .dropdown__grid { grid-template-columns: 1fr; }
  .dropdown__foot { border-top: 1px solid var(--border); margin-top: 10px; padding: 12px 8px 2px; }

  /* Open states: hover/focus without JS, aria-expanded with JS */
  .no-js .nav-item:hover > .dropdown,
  .no-js .nav-item:focus-within > .dropdown,
  .js .nav-trigger[aria-expanded="true"] + .dropdown {
    visibility: visible; opacity: 1; transform: none; transition-delay: 0s;
  }

  .hero__grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 56px; align-items: end; }
  .hero__grid .lead { margin-top: 0; }
  .hero__visual { margin-top: 56px; }
  .page-hero__grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 56px; }
  .page-hero__grid .page-hero__copy h1 { max-width: 15ch; }

  .eco-grid { grid-template-columns: repeat(6, minmax(0,1fr)); }
  .eco-card { grid-column: span 2; }
  .eco-card--wide { grid-column: span 3; }
  .grid--4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
  .feature-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
  .feature-grid--2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .related { grid-template-columns: repeat(3, minmax(0,1fr)); }

  .arch { grid-template-columns: 1fr auto 1.4fr auto 1fr; align-items: stretch; }
  .arch__link { align-items: center; }
  .arch__link svg { transform: rotate(-90deg); }
  .arch__tier--core .arch__nodes { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .arch__tier:not(.arch__tier--core) .arch__nodes { grid-template-columns: 1fr; }
  .arch--vertical { grid-template-columns: 1fr; }
  .arch--vertical .arch__link svg { transform: none; }
  .arch--vertical .arch__tier .arch__nodes,
  .arch--vertical .arch__tier--core .arch__nodes { grid-template-columns: repeat(3, minmax(0,1fr)); }

  .footer-grid { grid-template-columns: 1.5fr repeat(5, minmax(0,1fr)); gap: 28px; }
  .article-layout { grid-template-columns: minmax(0, 1fr) 260px; gap: 64px; }
  .article-layout .toc { position: sticky; top: calc(var(--header-h) + 24px); align-self: start; order: 2; }
  .legal { grid-template-columns: 240px minmax(0,1fr); gap: 64px; }
  .legal .toc { position: sticky; top: calc(var(--header-h) + 24px); align-self: start; }
  .contact-layout { grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); align-items: start; }
  .calc__layout { grid-template-columns: minmax(0, 1fr) 360px; gap: 40px; }
  .calc__summary { position: sticky; top: calc(var(--header-h) + 20px); max-height: calc(100vh - var(--header-h) - 40px); overflow-y: auto; }
  .cta-band__inner { padding: 64px 64px; }
}

@media (min-width: 1200px) {
  :root { --gutter: 32px; }
  .nav-link, .nav-trigger { padding: 8px 14px; }
  .ui-float { right: -28px; }
}

@media (max-width: 380px) {
  .btn-row .btn { width: 100%; }
  .brand img { width: 118px; }
}