/* MVKTech — Design System
   Palette family: obsidian-gold (#0c0c0c + #d4af37)
   Fonts: Crimson Pro (headings) + Barlow (body) — self-hosted woff2
   Archetype: Premium dark editorial, 2-col hero, grayscale→color cards */

/* ─── Fonts (self-hosted, latin subset) ─── */
@font-face {
  font-family: 'Crimson Pro';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/fonts/crimson-pro-latin-400-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Crimson Pro';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/fonts/crimson-pro-latin-400-italic.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Crimson Pro';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/assets/fonts/crimson-pro-latin-600-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Crimson Pro';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/assets/fonts/crimson-pro-latin-700-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Barlow';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/fonts/barlow-latin-400-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Barlow';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/assets/fonts/barlow-latin-500-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Barlow';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('/assets/fonts/barlow-latin-600-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face {
  font-family: 'Barlow';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/assets/fonts/barlow-latin-700-normal.woff2') format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}

/* ─── Reset ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
img, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }

/* ─── Tokens ─── */
:root {
  --bg:          #0c0c0c;
  --bg-alt:      #0a0a0a;
  --surface:     #161616;
  --surface-2:   #1e1e1e;
  --border:      rgba(255,255,255,0.07);
  --border-med:  rgba(255,255,255,0.12);
  --text:        #e5e5e5;
  --text-muted:  #9ca3af;
  --text-dim:    #6b7280;
  --accent:      #d4af37;
  --accent-dark: #b8952e;
  --font-serif:  'Crimson Pro', Georgia, 'Times New Roman', serif;
  --font-sans:   'Barlow', system-ui, -apple-system, sans-serif;
  --max-w:       1280px;
  --px:          1.5rem;
  --gap:         2.5rem;
}

/* ─── Base ─── */
body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  font-size: 1rem;
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

/* ─── Container ─── */
.container {
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--px);
  padding-right: var(--px);
}

/* ─── Nav ─── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(12,12,12,0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-nav__inner {
  display: flex;
  align-items: center;
  height: 3.5rem;
  gap: 0;
}
.site-nav__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  margin-right: 2.5rem;
}
.site-nav__logo svg { flex-shrink: 0; }
.site-nav__wordmark {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
}
.site-nav__links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  flex: 1;
}
.site-nav__links a {
  display: block;
  padding: 0 0.875rem;
  height: 3.5rem;
  line-height: 3.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  transition: color 0.2s;
  white-space: nowrap;
}
.site-nav__links a:hover,
.site-nav__links a[aria-current="page"] { color: var(--text); }
.site-nav__links a[aria-current="page"] {
  position: relative;
}
.site-nav__links a[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0.875rem; right: 0.875rem;
  height: 2px;
  background: var(--accent);
}
.site-nav__search {
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-dim);
  padding: 0.5rem;
  transition: color 0.2s;
}
.site-nav__search:hover { color: var(--text); }
.site-nav__mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  padding: 0.5rem;
  margin-left: auto;
}

/* ─── Hero (homepage) ─── */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
  align-items: center;
  padding: 4rem var(--px) 4rem;
  max-width: var(--max-w);
  margin: 0 auto;
  border-bottom: 1px solid var(--border);
}
.hero__meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.hero__tag {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-med);
  color: var(--text-muted);
}
.hero__readtime {
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
}
.hero__headline {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 1.5rem;
}
.hero__headline em { font-style: italic; font-weight: 400; }
.hero__intro {
  font-size: 1.0625rem;
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 38rem;
  margin-bottom: 2rem;
}
.hero__byline {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}
.hero__byline-text .name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
}
.hero__byline-text .role {
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.hero__image-wrap {
  position: relative;
  overflow: hidden;
  height: 500px;
}
.hero__image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1s ease;
}
.hero__image-wrap:hover img { transform: scale(1.04); }
.hero__image-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--bg) 0%, transparent 40%);
  pointer-events: none;
}

/* ─── Article Grid ─── */
.articles-section {
  background: var(--bg-alt);
  padding: 4rem var(--px);
}
.articles-section__inner { max-width: var(--max-w); margin: 0 auto; }
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-med);
  margin-bottom: 3rem;
}
.section-header__title {
  font-family: var(--font-serif);
  font-size: 1.875rem;
  font-style: italic;
  color: var(--text);
}
.section-header__link {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  transition: gap 0.2s;
}
.section-header__link:hover { gap: 0.625rem; }
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem 2.25rem;
}
.article-card { display: block; }
.article-card__image {
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  margin-bottom: 1rem;
}
.article-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.9);
  transition: filter 0.7s, transform 0.7s;
}
.article-card:hover .article-card__image img {
  filter: grayscale(0);
  transform: scale(1.06);
}
.article-card__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.625rem;
}
.article-card__category {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}
.article-card__date {
  font-size: 0.625rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.article-card__title {
  font-family: var(--font-serif);
  font-size: 1.1875rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
  margin-bottom: 0.5rem;
  transition: color 0.2s;
}
.article-card:hover .article-card__title { color: var(--accent); }
.article-card__excerpt {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ─── Article Page ─── */
.article-header {
  padding: 4rem var(--px) 3rem;
  max-width: var(--max-w);
  margin: 0 auto;
  border-bottom: 1px solid var(--border);
}
.article-header__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.article-header__breadcrumb a { color: var(--text-dim); transition: color 0.2s; }
.article-header__breadcrumb a:hover { color: var(--accent); }
.article-header__breadcrumb span { color: var(--border-med); }
.article-header__category {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}
.article-header__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4.5vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 1.25rem;
  max-width: 48rem;
}
.article-header__title em { font-style: italic; font-weight: 400; }
.article-header__intro {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 44rem;
  margin-bottom: 1.75rem;
}
.article-header__byline {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
.article-header__byline .name { font-size: 0.875rem; font-weight: 600; }
.article-header__byline .date {
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-left: auto;
}

/* ─── Article Hero Image ─── */
.article-hero {
  width: 100%;
  max-height: 480px;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.article-hero img { width: 100%; height: 100%; max-height: 480px; object-fit: cover; }

/* ─── Article Body ─── */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 4rem;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3rem var(--px) 5rem;
  align-items: start;
}
.article-body { min-width: 0; }
.article-body p {
  font-size: 1.0625rem;
  line-height: 1.85;
  color: #b0b0b0;
  margin-bottom: 1.5rem;
}
.article-body h2 {
  font-family: var(--font-serif);
  font-size: 1.875rem;
  font-style: italic;
  color: var(--text);
  margin-top: 3rem;
  margin-bottom: 1.25rem;
  line-height: 1.2;
}
.article-body h3 {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  color: var(--text);
  margin-top: 2rem;
  margin-bottom: 0.875rem;
  line-height: 1.3;
}
.article-body ul, .article-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
  color: #b0b0b0;
}
.article-body li { margin-bottom: 0.375rem; font-size: 1.0625rem; line-height: 1.75; }
.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1.75rem;
  margin: 2.5rem 0;
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-style: italic;
  color: var(--text);
  line-height: 1.5;
}
.article-body code {
  font-size: 0.875em;
  background: var(--surface);
  border: 1px solid var(--border-med);
  padding: 0.1em 0.4em;
  color: var(--accent);
  font-family: 'Courier New', monospace;
}
.article-body pre {
  background: var(--surface);
  border: 1px solid var(--border-med);
  padding: 1.25rem;
  overflow-x: auto;
  margin-bottom: 1.5rem;
}
.article-body pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.875rem;
  line-height: 1.6;
  color: #c9c9c9;
}
.article-body img {
  width: 100%;
  margin: 2rem 0;
  border: 1px solid var(--border);
}
.article-body a { color: var(--accent); text-decoration: underline; text-decoration-color: rgba(212,175,55,0.4); }
.article-body a:hover { text-decoration-color: var(--accent); }
.article-body strong { color: var(--text); font-weight: 600; }

/* ─── Spec Table ─── */
.spec-table-wrap { overflow-x: auto; margin-bottom: 2rem; }
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.spec-table th {
  text-align: left;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 0.625rem 0.875rem;
  border-bottom: 1px solid var(--border-med);
  background: var(--surface);
  white-space: nowrap;
}
.spec-table td {
  padding: 0.625rem 0.875rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  vertical-align: top;
}
.spec-table tr:hover td { background: rgba(255,255,255,0.02); }
.spec-table td:first-child { color: var(--text); font-weight: 500; }
.spec-table .val-accent { color: var(--accent); font-weight: 600; }
.spec-table .row-header td {
  background: var(--surface);
  color: var(--accent);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding-top: 1rem;
}

/* ─── Article Sidebar ─── */
.article-sidebar { position: sticky; top: 5rem; }
.sidebar-toc {
  border: 1px solid var(--border);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}
.sidebar-toc__title {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 1rem;
}
.sidebar-toc ol {
  list-style: none;
  padding: 0;
  counter-reset: toc;
}
.sidebar-toc li {
  counter-increment: toc;
  margin-bottom: 0.5rem;
}
.sidebar-toc a {
  font-size: 0.8125rem;
  color: var(--text-muted);
  transition: color 0.2s;
  display: flex;
  gap: 0.625rem;
}
.sidebar-toc a::before {
  content: counter(toc, decimal-leading-zero);
  color: var(--text-dim);
  font-size: 0.6875rem;
  flex-shrink: 0;
  padding-top: 0.1em;
}
.sidebar-toc a:hover { color: var(--accent); }
.sidebar-related {
  border: 1px solid var(--border);
  padding: 1.25rem;
}
.sidebar-related__title {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 1rem;
}
.sidebar-related__item {
  display: block;
  padding: 0.625rem 0;
  border-top: 1px solid var(--border);
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  color: var(--text-muted);
  transition: color 0.2s;
}
.sidebar-related__item:first-of-type { border-top: none; }
.sidebar-related__item:hover { color: var(--accent); }

/* ─── FAQ ─── */
.faq-section { margin-top: 3rem; }
.faq-section__title {
  font-family: var(--font-serif);
  font-size: 1.875rem;
  font-style: italic;
  color: var(--text);
  margin-bottom: 1.5rem;
}
.faq-item {
  border-bottom: 1px solid var(--border);
}
.faq-item summary {
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  cursor: pointer;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text);
  gap: 1rem;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 1.125rem;
  font-weight: 300;
  transition: transform 0.2s;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item[open] summary { color: var(--accent); }
.faq-answer {
  padding: 0 0 1rem;
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* ─── Infographic ─── */
.infographic-wrap {
  margin: 2.5rem 0;
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 1.5rem;
}
.infographic-caption {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-align: center;
  margin-top: 0.75rem;
  letter-spacing: 0.05em;
}
.infographic-embed {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
}
.infographic-embed textarea {
  width: 100%;
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: 'Courier New', monospace;
  font-size: 0.6875rem;
  line-height: 1.4;
  resize: none;
  height: 2.5rem;
  overflow: hidden;
}
.infographic-embed-label {
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 0.25rem;
}

/* ─── GPU Database ─── */
.gpu-db-header {
  padding: 4rem var(--px) 2.5rem;
  max-width: var(--max-w);
  margin: 0 auto;
  border-bottom: 1px solid var(--border);
}
.gpu-db-filters {
  display: flex;
  gap: 0.625rem;
  flex-wrap: wrap;
  padding: 1.5rem var(--px);
  max-width: var(--max-w);
  margin: 0 auto;
  border-bottom: 1px solid var(--border);
}
.gpu-db-filter {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--border-med);
  color: var(--text-dim);
  cursor: pointer;
  background: none;
  transition: all 0.15s;
}
.gpu-db-filter:hover,
.gpu-db-filter.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(212,175,55,0.06);
}
.gpu-db-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem var(--px);
}
.gpu-db-section-title {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(212,175,55,0.2);
}

/* ─── Category / Archive page ─── */
.category-header {
  padding: 3.5rem var(--px) 2rem;
  max-width: var(--max-w);
  margin: 0 auto;
  border-bottom: 1px solid var(--border);
}
.category-header__label {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.category-header__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--text);
  margin-bottom: 0.75rem;
}
.category-header__desc {
  font-size: 1.0625rem;
  color: var(--text-muted);
  max-width: 38rem;
  line-height: 1.7;
}

/* ─── Page Hero Banner (non-homepage) ─── */
.page-hero {
  width: 100%;
  overflow: hidden;
  max-height: 340px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.page-hero img { width: 100%; max-height: 340px; object-fit: cover; }

/* ─── Tool Download Box ─── */
.tool-box {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border-med);
  margin: 1.5rem 0;
}
.tool-box__icon {
  width: 2.5rem;
  height: 2.5rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(212,175,55,0.1);
  border: 1px solid rgba(212,175,55,0.25);
  color: var(--accent);
}
.tool-box__name { font-weight: 600; color: var(--text); margin-bottom: 0.25rem; }
.tool-box__desc { font-size: 0.875rem; color: var(--text-muted); }
.tool-box__link {
  margin-left: auto;
  flex-shrink: 0;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(212,175,55,0.3);
  padding: 0.375rem 0.875rem;
  transition: all 0.15s;
  white-space: nowrap;
  align-self: center;
}
.tool-box__link:hover { background: rgba(212,175,55,0.1); border-color: var(--accent); }

/* ─── Warning / Note Boxes (site-specific, not default callout) ─── */
.notice {
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-left: none;
  border-top: 2px solid var(--accent);
  background: rgba(212,175,55,0.05);
  font-size: 0.9375rem;
  color: var(--text-muted);
}
.notice--danger { border-top-color: #c0392b; background: rgba(192,57,43,0.07); }
.notice__heading {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.375rem;
}
.notice--danger .notice__heading { color: #e74c3c; }

/* ─── Footer ─── */
.site-footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 3.5rem var(--px) 2rem;
}
.site-footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.site-footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}
.site-footer__brand-name {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.75rem;
}
.site-footer__tagline {
  font-size: 0.875rem;
  color: var(--text-dim);
  line-height: 1.65;
  max-width: 22rem;
}
.site-footer__col-title {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 1rem;
}
.site-footer__links { list-style: none; }
.site-footer__links li { margin-bottom: 0.5rem; }
.site-footer__links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color 0.2s;
}
.site-footer__links a:hover { color: var(--accent); }
.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.site-footer__copy {
  font-size: 0.75rem;
  color: var(--text-dim);
}
.site-footer__legal {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}
.site-footer__legal a {
  font-size: 0.75rem;
  color: var(--text-dim);
  transition: color 0.2s;
}
.site-footer__legal a:hover { color: var(--text-muted); }

/* ─── Breadcrumb ─── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 0.875rem var(--px);
  max-width: var(--max-w);
  margin: 0 auto;
  border-bottom: 1px solid var(--border);
}
.breadcrumb a { color: var(--text-dim); transition: color 0.2s; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb__sep { color: var(--border-med); }
.breadcrumb__current { color: var(--text-muted); }

/* ─── Utility ─── */
.text-accent { color: var(--accent); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.divider { height: 1px; background: var(--border); margin: 2rem 0; }

/* ─── Responsive ─── */
@media (max-width: 1024px) {
  .hero { grid-template-columns: 1fr; gap: 2rem; }
  .hero__image-wrap { height: 320px; order: -1; }
  .hero__headline { font-size: 2.75rem; }
  .article-grid { grid-template-columns: repeat(2, 1fr); }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
  .site-footer__top { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
@media (max-width: 768px) {
  :root { --px: 1rem; }
  .site-nav__links { display: none; }
  .site-nav__mobile-toggle { display: flex; }
  .site-nav__search { display: none; }
  .article-grid { grid-template-columns: 1fr; }
  .gpu-db-section { overflow-x: auto; }
  .site-footer__top { grid-template-columns: 1fr; }
  .site-footer__bottom { flex-direction: column; align-items: flex-start; }
  .hero__headline { font-size: 2.25rem; }
}
@media (max-width: 480px) {
  .article-header__title { font-size: 1.875rem; }
  .hero { padding: 2rem var(--px); }
  .articles-section { padding: 2.5rem var(--px); }
}