/* ==========================================================================
   responsive.css — desktop-first breakpoints
   Breakpoints: 1200px, 1024px, 860px, 640px, 460px
   ========================================================================== */

@media (max-width: 1200px) {
  :root {
    --container-pad: 32px;
    --space-3xl: 80px;
    --space-4xl: 104px;
  }

  .article-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: var(--space-2xl);
  }

  .grid--sidebar {
    gap: var(--space-2xl);
  }

  .hero__grid,
  .split,
  .grid--asym {
    gap: var(--space-2xl);
  }
}

@media (max-width: 1024px) {
  :root {
    --fs-h1: clamp(44px, 7vw, 68px);
    --fs-h2: clamp(32px, 5.4vw, 48px);
  }

  .nav-primary,
  .site-header__actions .btn {
    display: none;
  }

  .nav-toggle {
    display: grid;
  }

  .site-header__inner {
    justify-content: space-between;
    gap: var(--space-s);
  }

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

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

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

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

  .footer__top {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-2xl);
  }

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

  .article-layout,
  .article-layout--right {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-xl);
  }

  .toc {
    position: static;
    max-height: none;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-m);
    padding: var(--space-m);
  }

  .toc__aside {
    display: none;
  }

  .rail {
    position: static;
  }

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

  .prose {
    max-width: none;
  }
}

@media (max-width: 860px) {
  :root {
    --container-pad: 24px;
    --space-3xl: 64px;
    --space-4xl: 80px;
    --fs-h1: clamp(38px, 8vw, 54px);
  }

  .hero {
    padding-block: var(--space-2xl) var(--space-2xl);
  }

  .hero__grid,
  .split,
  .grid--asym,
  .grid--2,
  .grid--3,
  .steps--3 {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-l);
  }

  .split--reverse .split__media {
    order: 0;
  }

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

  .cta-band__actions {
    justify-content: flex-start;
  }

  .card-index__row {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: var(--space-2xs) var(--space-s);
  }

  .card-index__text {
    grid-column: 2;
  }

  .card-index__row .card__arrow {
    display: none;
  }

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

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

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

  .page-nav a:last-child {
    text-align: left;
  }

  .topbar__inner p:last-child {
    display: none;
  }

  .card--wide {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-m);
  }
}

@media (max-width: 640px) {
  :root {
    --container-pad: 18px;
    --fs-body: 16.5px;
    --space-2xl: 48px;
    --space-3xl: 56px;
    --space-4xl: 64px;
  }

  .grid--4,
  .stats,
  .steps--4,
  .tile-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .tile-grid {
    border-radius: var(--radius-m);
  }

  .card {
    padding: var(--space-m);
    border-radius: var(--radius-m);
  }

  .section {
    padding-block: var(--space-2xl);
  }

  .hero__meta {
    gap: var(--space-s) var(--space-l);
  }

  .btn {
    padding: 14px 22px;
    font-size: 14.5px;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .disclaimer-band {
    flex-direction: column;
    gap: var(--space-s);
    padding: var(--space-m);
  }

  .definition {
    padding: var(--space-m);
  }

  .definition p {
    font-size: 17px;
  }

  .prose blockquote {
    font-size: 18px;
  }

  .accordion__trigger {
    font-size: 17px;
  }

  .footer__nav {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-m);
  }

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

  .spec-table th,
  .spec-table td {
    display: block;
    width: 100%;
    padding-left: 0;
  }

  .spec-table th {
    padding-bottom: 2px;
  }

  .spec-table td {
    padding-top: 0;
    padding-bottom: 14px;
  }
}

@media (max-width: 460px) {
  .logo__tag {
    display: none;
  }

  .card-visual {
    padding: var(--space-s);
  }

  .card-visual__number {
    font-size: 13px;
    letter-spacing: 0.1em;
  }

  .search-panel {
    padding-top: 8vh;
  }
}

/* Print ------------------------------------------------------------------ */

@media print {
  .site-header,
  .topbar,
  .drawer,
  .overlay,
  .search-panel,
  .cta-band,
  .toc {
    display: none !important;
  }

  body {
    background: #fff;
    font-size: 11pt;
  }

  .article-layout {
    display: block;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 9pt;
    color: #555;
  }
}