@layer reset, base, components, pages, responsive, motion, print;

@layer reset {
  :where(body, h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd, table) {
    margin: 0;
  }

  :where(ul, ol) {
    padding: 0;
  }

  :where(img, svg) {
    display: block;
    max-inline-size: 100%;
  }

  :where(table) {
    border-collapse: collapse;
  }

  :where(*, *::before, *::after) {
    box-sizing: border-box;
  }
}

@layer base {
  :root {
    color-scheme: light;
    --ink: #14181c;
    --ink-soft: #3c454e;
    --muted: #5d6873;
    --paper: #eef0f2;
    --paper-deep: #e0e4e8;
    --card: #f9fafb;
    --graphite: #1b2026;
    --graphite-deep: #11151a;
    --graphite-soft: #2a323b;
    --copper: #b8672f;
    --copper-bright: #d98644;
    --copper-pale: #f0d8c4;
    --patina: #2f6f62;
    --brass: #b39114;
    --line: color-mix(in srgb, var(--ink) 16%, transparent);
    --line-strong: color-mix(in srgb, var(--ink) 32%, transparent);
    --shell: 76rem;
    --prose: 70ch;
    --header-h: 4.5rem;
    --font-sans: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", sans-serif;
    --font-display: "Haettenschweiler", "Arial Narrow", "Segoe UI", system-ui, sans-serif;
    --font-mono: "Cascadia Mono", Consolas, "Liberation Mono", ui-monospace, monospace;
    --radius: 0.25rem;

    /* Fémszínek – a felismerés oldalak mintáihoz */
    --m-rez: linear-gradient(145deg, #e0975c 8%, #b87333 45%, #7e4a1e 100%);
    --m-sargarez: linear-gradient(145deg, #ecd98a 8%, #c9a227 45%, #8c6f14 100%);
    --m-bronz: linear-gradient(145deg, #cfa268 8%, #a97142 45%, #6f4726 100%);
    --m-alu: linear-gradient(145deg, #eef1f3 8%, #c2c9cf 45%, #8e979f 100%);
    --m-cink: linear-gradient(145deg, #dfe5e9 8%, #a9b4bc 45%, #78848d 100%);
    --m-olom: linear-gradient(145deg, #b9bcbf 8%, #8b8f93 45%, #5e6265 100%);
    --m-on: linear-gradient(145deg, #f1f4f6 8%, #ccd4d9 45%, #98a3ab 100%);
    --m-nikkel: linear-gradient(145deg, #eceade 8%, #c6c2ad 45%, #918d78 100%);
    --m-titan: linear-gradient(145deg, #d5dade 8%, #9ca4aa 45%, #6b7379 100%);
    --m-acel: linear-gradient(145deg, #e8ebee 8%, #b4bcc3 45%, #7f878e 100%);
  }

  html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-h) + 0.8rem);
    background: var(--graphite-deep);
  }

  body {
    min-inline-size: 20rem;
    min-block-size: 100dvh;
    color: var(--ink);
    background:
      linear-gradient(180deg, color-mix(in srgb, var(--copper) 7%, transparent), transparent 22rem),
      var(--paper);
    font-family: var(--font-sans);
    font-size: 1.05rem;
    line-height: 1.65;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
  }

  a {
    color: inherit;
    text-underline-offset: 0.18em;
  }

  :where(a, button, summary, input):focus-visible {
    outline: 0.18rem solid var(--copper);
    outline-offset: 0.22rem;
  }

  :where(h1, h2, h3, h4) {
    font-weight: 700;
    line-height: 1.14;
    letter-spacing: -0.022em;
    text-wrap: balance;
  }

  h1 {
    font-size: clamp(2.25rem, 5.6vw, 3.9rem);
    letter-spacing: -0.035em;
  }

  h1 em {
    font-style: normal;
    color: var(--copper);
  }

  h2 {
    font-size: clamp(1.6rem, 3vw, 2.3rem);
    letter-spacing: -0.03em;
  }

  h3 {
    font-size: 1.22rem;
  }

  p,
  li {
    text-wrap: pretty;
  }

  .shell {
    width: min(calc(100% - 2.4rem), var(--shell));
    margin-inline: auto;
  }

  .skip-link {
    position: fixed;
    z-index: 100;
    inset-block-start: 0.75rem;
    inset-inline-start: 0.75rem;
    padding: 0.7rem 1rem;
    color: #fff;
    background: var(--copper);
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 700;
    transform: translateY(-180%);
  }

  .skip-link:focus {
    transform: none;
  }
}

@layer components {
  .site-header {
    position: sticky;
    z-index: 40;
    inset-block-start: 0;
    color: #f2f4f6;
    background: var(--graphite);
    border-block-end: 1px solid color-mix(in srgb, var(--copper) 45%, transparent);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-block-size: var(--header-h);
  }

  .brand {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.03em;
  }

  .brand b {
    color: var(--copper-bright);
    font-weight: 700;
  }

  .brand-mark {
    display: grid;
    place-items: center;
    inline-size: 2.1rem;
    block-size: 2.1rem;
    border-radius: 0.3rem;
    background: var(--m-rez);
    color: #2b1608;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 700;
    box-shadow: inset 0 0 0 1px color-mix(in srgb, #fff 35%, transparent);
  }

  .desktop-nav ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.1rem 1.05rem;
    list-style: none;
  }

  .desktop-nav a {
    display: inline-block;
    padding-block: 0.35rem;
    color: color-mix(in srgb, #f2f4f6 78%, var(--copper-bright));
    text-decoration: none;
    font-size: 0.86rem;
  }

  .desktop-nav a:hover,
  .desktop-nav a[aria-current="page"] {
    color: var(--copper-bright);
  }

  .desktop-nav a[aria-current="page"] {
    text-decoration: underline;
    text-decoration-thickness: 0.12rem;
  }

  .mobile-menu {
    display: none;
  }

  .mobile-menu summary {
    list-style: none;
    cursor: pointer;
    padding: 0.45rem 0.7rem;
    border: 1px solid color-mix(in srgb, var(--copper-bright) 60%, transparent);
    border-radius: var(--radius);
    color: var(--copper-bright);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
  }

  .mobile-menu summary::-webkit-details-marker {
    display: none;
  }

  .mobile-menu summary::after {
    content: " +";
  }

  .mobile-menu[open] summary::after {
    content: " −";
  }

  .mobile-menu nav {
    position: absolute;
    inset-inline: 0;
    inset-block-start: var(--header-h);
    padding: 0.75rem 1.2rem 1.2rem;
    background: var(--graphite-deep);
    border-block-end: 1px solid color-mix(in srgb, var(--copper) 45%, transparent);
  }

  .mobile-menu nav ul {
    display: grid;
    gap: 0.1rem;
    list-style: none;
  }

  .mobile-menu a {
    display: block;
    padding: 0.7rem 0.15rem;
    color: #f2f4f6;
    text-decoration: none;
    border-block-end: 1px solid color-mix(in srgb, #fff 12%, transparent);
  }

  .mobile-menu a[aria-current="page"] {
    color: var(--copper-bright);
  }

  .button {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.85rem 1.2rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 700;
  }

  .button-primary {
    color: #fff;
    background: var(--copper);
  }

  .button-primary:hover {
    background: #a25a26;
  }

  .button-dark {
    color: #f2f4f6;
    background: var(--graphite);
  }

  .button-dark:hover {
    background: var(--graphite-deep);
  }

  .button-ghost {
    color: #f2f4f6;
    border: 1px solid color-mix(in srgb, #fff 38%, transparent);
  }

  .button-ghost:hover {
    border-color: var(--copper-bright);
    color: var(--copper-bright);
  }

  .text-link {
    font-weight: 700;
    text-underline-offset: 0.28em;
  }

  .kicker {
    margin-block-end: 0.7rem;
    color: #92511f;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
  }

  .kicker-light {
    color: var(--copper-bright);
  }

  .hero-actions,
  .cta-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem 1.4rem;
  }

  .crumb {
    margin-block-end: 1.2rem;
    font-size: 0.88rem;
  }

  .crumb ol {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem 0.5rem;
    list-style: none;
    color: var(--muted);
  }

  .crumb li:not(:last-child)::after {
    content: "/";
    margin-inline-start: 0.5rem;
    color: var(--line-strong);
  }

  .crumb a {
    color: #8f4f1e;
  }

  .updated {
    color: var(--muted);
    font-size: 0.9rem;
  }

  .metal-grid + .prose,
  .section-alt .updated {
    margin-block-start: 1.2rem;
  }

  .page-body .metal-grid {
    margin-block-end: 2.4rem;
  }

  .prose {
    max-inline-size: var(--prose);
  }

  .prose > * + * {
    margin-block-start: 1.05rem;
  }

  .prose h2 {
    margin-block-start: 2.4rem;
    padding-block-start: 1.2rem;
    border-block-start: 2px solid var(--line-strong);
  }

  .prose h3 {
    margin-block-start: 1.8rem;
  }

  .prose a {
    color: #8f4f1e;
    font-weight: 700;
  }

  .ext::after {
    content: " \2197";
    font-weight: 700;
    text-decoration: none;
  }

  .prose ul,
  .prose ol {
    padding-inline-start: 1.25rem;
  }

  .prose li + li {
    margin-block-start: 0.4rem;
  }

  .prose blockquote {
    padding: 0.2rem 0 0.2rem 1.1rem;
    border-inline-start: 0.28rem solid var(--copper);
    font-size: 1.15rem;
    font-style: italic;
    color: var(--ink-soft);
  }

  .prose code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    background: var(--paper-deep);
    padding: 0.05em 0.3em;
    border-radius: 0.2rem;
  }

  .lead {
    max-inline-size: 42rem;
    color: var(--ink-soft);
    font-size: 1.16rem;
  }

  .note,
  .warn {
    display: grid;
    gap: 0.5rem;
    margin-block-start: 1.6rem;
    padding: 1.1rem 1.2rem 1.2rem;
    background: var(--card);
    border-inline-start: 0.32rem solid var(--patina);
    border-radius: 0 var(--radius) var(--radius) 0;
  }

  .warn {
    border-inline-start-color: var(--copper);
    background: color-mix(in srgb, var(--copper-pale) 55%, var(--card));
  }

  .note b,
  .warn b {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--patina);
  }

  .warn b {
    color: #92511f;
  }

  .note p,
  .warn p {
    margin: 0;
  }

  .note p + p,
  .warn p + p {
    margin-block-start: 0.6rem;
  }

  .data-table {
    inline-size: 100%;
    margin-block-start: 1.4rem;
    font-size: 0.95rem;
    background: var(--card);
    border: 1px solid var(--line);
  }

  .data-table caption {
    margin-block-end: 0.55rem;
    color: var(--muted);
    font-size: 0.85rem;
    text-align: start;
  }

  .data-table th,
  .data-table td {
    padding: 0.6rem 0.7rem;
    border-block-end: 1px solid var(--line);
    text-align: start;
    vertical-align: top;
  }

  .data-table thead th {
    background: var(--graphite);
    color: #f2f4f6;
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    white-space: nowrap;
  }

  .data-table tbody th {
    font-weight: 700;
    white-space: nowrap;
  }

  .data-table td.num {
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
  }

  .data-table tbody tr:nth-child(even) {
    background: color-mix(in srgb, var(--paper-deep) 45%, transparent);
  }

  .table-scroll {
    overflow-x: auto;
    margin-block-start: 1.4rem;
  }

  .table-scroll .data-table {
    margin-block-start: 0;
    min-inline-size: 34rem;
  }

  .faq-list {
    display: grid;
    gap: 0.65rem;
  }

  .faq-list details {
    padding: 0.95rem 1.05rem;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
  }

  .faq-list summary {
    cursor: pointer;
    list-style: none;
    font-weight: 700;
  }

  .faq-list summary::-webkit-details-marker {
    display: none;
  }

  .faq-list summary::after {
    content: "+";
    float: inline-end;
    margin-inline-start: 0.8rem;
    color: var(--copper);
    font-weight: 700;
  }

  .faq-list details[open] summary::after {
    content: "−";
  }

  .faq-list details p {
    margin-block-start: 0.75rem;
    color: var(--ink-soft);
  }

  .related {
    display: grid;
    gap: 0.8rem;
    grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
    margin-block-start: 1.4rem;
  }

  .related a {
    display: grid;
    gap: 0.3rem;
    align-content: start;
    padding: 1.05rem 1.1rem;
    background: var(--card);
    border: 1px solid var(--line);
    border-block-start: 0.28rem solid var(--copper);
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 700;
  }

  .related a:hover {
    border-color: var(--graphite);
    border-block-start-color: var(--copper);
  }

  .related span {
    color: #92511f;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .site-footer {
    color: color-mix(in srgb, #f2f4f6 80%, var(--copper-bright));
    background: var(--graphite-deep);
  }

  .footer-main {
    display: grid;
    gap: 1.5rem;
    padding-block: 2.6rem 1.8rem;
    border-block-end: 1px solid color-mix(in srgb, var(--copper) 30%, transparent);
  }

  .footer-main p {
    max-inline-size: 46rem;
    color: color-mix(in srgb, #f2f4f6 65%, transparent);
  }

  .footer-main .brand {
    margin-block-end: 0.8rem;
  }

  .footer-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem 1.15rem;
    align-content: start;
  }

  .footer-nav a {
    color: var(--copper-bright);
    text-decoration: none;
  }

  .footer-nav a:hover {
    text-decoration: underline;
  }

  .footer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.6rem 1.5rem;
    padding-block: 1.1rem 1.4rem;
    color: color-mix(in srgb, #f2f4f6 52%, transparent);
    font-size: 0.86rem;
  }

  .footer-bottom a {
    color: var(--copper-bright);
  }
}

@layer pages {
  .hero {
    position: relative;
    overflow: hidden;
    padding-block: clamp(2.4rem, 6vw, 4.4rem) 2.6rem;
  }

  .hero-layout {
    display: grid;
    gap: 2.4rem;
    align-items: center;
  }

  .hero-lead {
    max-inline-size: 38rem;
    margin-block: 1.15rem 1.6rem;
    color: var(--ink-soft);
    font-size: 1.18rem;
  }

  .spec-card {
    position: relative;
    padding: 1.3rem 1.3rem 1.1rem;
    color: #f2f4f6;
    background: linear-gradient(180deg, var(--graphite-soft), var(--graphite-deep));
    border-radius: 0.4rem;
    box-shadow: 0.65rem 0.65rem 0 color-mix(in srgb, var(--copper) 60%, var(--ink));
  }

  .spec-card header {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding-block-end: 0.8rem;
    margin-block-end: 0.9rem;
    border-block-end: 1px solid color-mix(in srgb, #fff 16%, transparent);
    color: var(--copper-bright);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
  }

  .spec-card dl {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.5rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.88rem;
  }

  .spec-card dt {
    color: color-mix(in srgb, #f2f4f6 62%, transparent);
  }

  .spec-card dd {
    margin: 0;
    text-align: end;
    font-variant-numeric: tabular-nums;
  }

  .spec-card dd b {
    color: var(--copper-bright);
  }

  .spec-foot {
    margin-block-start: 1rem;
    padding-block-start: 0.8rem;
    border-block-start: 1px solid color-mix(in srgb, #fff 16%, transparent);
    color: color-mix(in srgb, #f2f4f6 60%, transparent);
    font-size: 0.82rem;
  }

  .section,
  .page-hero,
  .page-body {
    padding-block: clamp(2.2rem, 5vw, 4rem);
  }

  .section-alt {
    background: var(--card);
    border-block: 1px solid var(--line);
  }

  .section-heading {
    display: grid;
    gap: 0.8rem;
    margin-block-end: 1.8rem;
  }

  .section-heading p {
    max-inline-size: 48rem;
    color: var(--ink-soft);
  }

  .metal-grid {
    display: grid;
    gap: 0.9rem;
  }

  .metal-card {
    display: grid;
    gap: 0.4rem;
    align-content: start;
    padding: 1.15rem 1.15rem 1.25rem;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
  }

  .swatch {
    inline-size: 3rem;
    block-size: 3rem;
    margin-block-end: 0.35rem;
    border-radius: 0.3rem;
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--ink) 22%, transparent);
  }

  .swatch-rez { background: var(--m-rez); }
  .swatch-sargarez { background: var(--m-sargarez); }
  .swatch-bronz { background: var(--m-bronz); }
  .swatch-alu { background: var(--m-alu); }
  .swatch-cink { background: var(--m-cink); }
  .swatch-olom { background: var(--m-olom); }
  .swatch-on { background: var(--m-on); }
  .swatch-nikkel { background: var(--m-nikkel); }
  .swatch-titan { background: var(--m-titan); }
  .swatch-acel { background: var(--m-acel); }

  .metal-card h3 {
    font-size: 1.18rem;
  }

  .metal-card .sym {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #92511f;
  }

  .metal-card p {
    color: var(--ink-soft);
    font-size: 0.98rem;
  }

  .metal-card dl {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.2rem 0.8rem;
    margin-block-start: 0.5rem;
    padding-block-start: 0.6rem;
    border-block-start: 1px solid var(--line);
    font-family: var(--font-mono);
    font-size: 0.8rem;
  }

  .metal-card dt {
    color: var(--muted);
  }

  .metal-card dd {
    margin: 0;
    text-align: end;
    font-variant-numeric: tabular-nums;
  }

  .topic-grid {
    display: grid;
    gap: 0.9rem;
  }

  .topic-card {
    display: grid;
    gap: 0.45rem;
    align-content: start;
    padding: 1.25rem 1.2rem 1.3rem;
    background: var(--card);
    border: 1px solid var(--line);
    border-block-start: 0.3rem solid var(--copper);
    border-radius: var(--radius);
    text-decoration: none;
    box-shadow: 0.3rem 0.3rem 0 color-mix(in srgb, var(--ink) 7%, transparent);
  }

  .topic-card:hover {
    transform: translate(-0.12rem, -0.12rem);
    box-shadow: 0.45rem 0.45rem 0 color-mix(in srgb, var(--graphite) 26%, transparent);
  }

  .topic-card span {
    color: #92511f;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .topic-card h3,
  .topic-card strong {
    font-size: 1.28rem;
    letter-spacing: -0.02em;
  }

  .topic-card p {
    color: var(--ink-soft);
    font-size: 0.98rem;
  }

  .dark-band {
    color: #f2f4f6;
    background:
      linear-gradient(90deg, var(--copper) 0 0.35rem, transparent 0),
      var(--graphite);
    padding-block: clamp(2.6rem, 6vw, 4.2rem);
  }

  .dark-band h2 em {
    color: var(--copper-bright);
    font-style: normal;
  }

  .dark-band .lead {
    margin-block: 1rem 1.6rem;
    color: color-mix(in srgb, #f2f4f6 76%, transparent);
  }

  .contrast-grid {
    display: grid;
    gap: 0.85rem;
  }

  .contrast-grid article {
    padding: 1.15rem 1.15rem 1.2rem;
    background: color-mix(in srgb, #fff 7%, transparent);
    border: 1px solid color-mix(in srgb, #fff 15%, transparent);
    border-radius: var(--radius);
  }

  .contrast-grid h3 {
    margin-block-end: 0.4rem;
    color: var(--copper-bright);
  }

  .contrast-grid p {
    color: color-mix(in srgb, #f2f4f6 78%, transparent);
    font-size: 0.98rem;
  }

  .step-list {
    display: grid;
    gap: 0;
    list-style: none;
    border-block-start: 1px solid var(--line-strong);
  }

  .step-list li {
    display: grid;
    grid-template-columns: 3rem 1fr;
    gap: 0.9rem;
    padding-block: 1.05rem;
    border-block-end: 1px solid var(--line);
  }

  .step-list b {
    color: var(--copper);
    font-family: var(--font-mono);
    font-size: 1.05rem;
  }

  .step-list h3 {
    margin-block-end: 0.25rem;
  }

  .step-list p {
    color: var(--ink-soft);
  }

  .method-list {
    display: grid;
    gap: 0.9rem;
    margin-block-start: 1.6rem;
    list-style: none;
  }

  .method-list > li {
    display: grid;
    gap: 0.35rem;
    padding: 1.15rem 1.2rem 1.25rem;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
  }

  .method-list h2 {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 1.22rem;
  }

  .method-list .tagline {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-block-start: 0.5rem;
  }

  .tag {
    padding: 0.15rem 0.55rem;
    border: 1px solid var(--line-strong);
    border-radius: 1rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    color: var(--muted);
  }

  .tag-good {
    border-color: color-mix(in srgb, var(--patina) 55%, transparent);
    color: var(--patina);
  }

  .tag-warn {
    border-color: color-mix(in srgb, var(--copper) 55%, transparent);
    color: #92511f;
  }

  .page-hero {
    background: linear-gradient(180deg, color-mix(in srgb, var(--graphite) 9%, var(--paper)), var(--paper) 72%);
    border-block-end: 1px solid var(--line);
  }

  .page-hero h1 {
    max-inline-size: 22rem;
  }

  .page-hero .hero-lead {
    margin-block-end: 0.9rem;
  }

  .page-body {
    padding-block-start: 2rem;
  }

  .page-body > .shell + .shell {
    margin-block-start: 2.6rem;
  }

  .toc {
    max-inline-size: var(--prose);
    margin-block-end: 2rem;
    padding: 1.05rem 1.2rem 1.15rem;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
  }

  .toc h2 {
    margin: 0 0 0.6rem;
    padding: 0;
    border: 0;
    font-size: 0.78rem;
    font-family: var(--font-mono);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
  }

  .toc ol {
    display: grid;
    gap: 0.3rem;
    padding-inline-start: 1.25rem;
    font-weight: 600;
  }

  .toc a {
    color: #8f4f1e;
  }

  .cta-band {
    padding-block: clamp(2.4rem, 5vw, 3.6rem);
    background: var(--paper-deep);
  }

  .source-list {
    display: grid;
    gap: 0.8rem;
    max-inline-size: var(--prose);
    margin-block-start: 1.4rem;
    list-style: none;
  }

  .source-list li {
    padding: 1rem 1.1rem;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
  }

  .source-list a {
    color: #8f4f1e;
    font-weight: 700;
  }

  .source-list p {
    margin-block-start: 0.3rem;
    color: var(--ink-soft);
    font-size: 0.95rem;
  }

  .error-page {
    min-block-size: 60vh;
    display: grid;
    align-content: center;
    padding-block: 4rem;
  }

  .error-page h1 {
    font-size: clamp(2.8rem, 8vw, 5.5rem);
  }
}

@layer responsive {
  @media (min-width: 720px) {
    .hero-layout {
      grid-template-columns: 1.15fr 0.85fr;
    }

    .metal-grid,
    .topic-grid,
    .contrast-grid {
      grid-template-columns: 1fr 1fr;
    }

    .footer-main {
      grid-template-columns: 1.4fr 1fr;
      align-items: start;
    }
  }

  @media (min-width: 1000px) {
    .metal-grid {
      grid-template-columns: repeat(4, 1fr);
    }

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

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

  @media (max-width: 899px) {
    .desktop-nav {
      display: none;
    }

    .mobile-menu {
      display: block;
    }
  }
}

@layer motion {
  .topic-card {
    transition: transform 0.15s ease, box-shadow 0.15s ease;
  }

  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }

    .topic-card {
      transition: none;
    }

    .topic-card:hover {
      transform: none;
    }
  }
}

@layer print {
  @media print {
    .site-header,
    .site-footer .footer-nav,
    .skip-link,
    .mobile-menu,
    .hero-actions,
    .cta-band,
    .cta-actions {
      display: none !important;
    }

    body {
      background: #fff;
      color: #000;
      font-size: 11pt;
    }

    .spec-card,
    .dark-band,
    .data-table thead th {
      color: #000 !important;
      background: #fff !important;
      box-shadow: none !important;
      border: 1px solid #000;
    }

    a[href^="http"]::after {
      content: " (" attr(href) ")";
      font-size: 0.85em;
      word-break: break-all;
    }

    .faq-list details {
      break-inside: avoid;
    }
  }
}