/* GEOLiNK · /blog/oem-odm-motherboard-checklist/ — pre-tooling article
   Unique prefix: pg-bo- . No global class selectors in this file. */

/* ---- Hero: scene left, type right ---- */
.pg-bo-hero {
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(var(--color-white-rgb), 0.82), rgba(var(--color-ice-rgb), 0.26)),
    var(--bg);
}
.pg-bo-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(30px, 5vw, 72px);
  align-items: center;
  padding-block: clamp(48px, 6vw, 90px);
}
.pg-bo-hero-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lift);
}
.pg-bo-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.pg-bo-hero-media figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 10px;
  background: rgba(var(--color-graphite-deep-rgb), 0.72);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.pg-bo-hero-copy {
  max-width: 660px;
}
.pg-bo-hero-copy h1 {
  max-width: 15ch;
  margin: 0;
}
.pg-bo-hero-copy p {
  max-width: 54ch;
  margin-top: var(--space-5);
  color: var(--text-secondary);
}
.pg-bo-hero-copy > p:first-child {
  margin-top: 0;
  color: var(--accent-ink);
}
.pg-bo-hero-meta {
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.pg-bo-hero-meta span {
  margin-inline: 7px;
  color: var(--accent-ink);
}
.pg-bo-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}
.pg-bo-hero-boundary {
  padding-top: var(--space-4);
  border-top: 1px solid var(--line);
  font-size: 12.5px;
}

/* ---- Sample gate ---- */
.pg-bo-gate-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  gap: clamp(30px, 5vw, 68px);
  align-items: center;
}
.pg-bo-gate-copy h2 {
  max-width: 19ch;
  margin-top: var(--space-2);
}
.pg-bo-gate-copy > p {
  max-width: 56ch;
  margin-top: var(--space-4);
  color: var(--text-secondary);
}
.pg-bo-gate-list {
  margin-top: var(--space-6);
  border-top: 1px solid var(--line);
  list-style: none;
  counter-reset: pg-bo-gate;
}
.pg-bo-gate-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--line);
}
.pg-bo-gate-list li > span {
  color: var(--accent-ink);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}
.pg-bo-gate-list h3 {
  font-size: 16px;
  line-height: 1.35;
}
.pg-bo-gate-list p {
  margin-top: 4px;
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.55;
}
.pg-bo-gate-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lift);
}
.pg-bo-gate-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.pg-bo-gate-media figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 6px 10px;
  background: rgba(var(--color-graphite-deep-rgb), 0.72);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* ---- Change-scope flow ---- */
.pg-bo-scope {
  width: 100%;
  height: auto;
  padding: clamp(16px, 2.4vw, 28px);
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(var(--color-white-rgb), 0.9), rgba(var(--color-ice-rgb), 0.4)),
    var(--panel-deep);
}
.pg-bo-scope-line {
  stroke: var(--line-strong);
  stroke-width: 1;
  stroke-dasharray: 2 4;
}
.pg-bo-scope-node {
  fill: var(--color-lab-raised);
  stroke: var(--accent-strong);
  stroke-width: 1;
}
.pg-bo-scope-label {
  fill: var(--ink);
  font-family: var(--font-mono);
  font-size: 10px;
  text-anchor: middle;
}
.pg-bo-scope-note {
  fill: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 9.5px;
}
.pg-bo-scope-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-6);
  list-style: none;
}
.pg-bo-scope-grid li {
  padding-top: var(--space-4);
  border-top: 2px solid var(--line);
}
.pg-bo-scope-grid h3 {
  font-size: 16px;
}
.pg-bo-scope-grid p {
  margin-top: 6px;
  color: var(--text-secondary);
  font-size: 12.5px;
  line-height: 1.6;
}

/* ---- Three-column change matrix ---- */
.pg-bo-matrix-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}
.pg-bo-col {
  padding: var(--space-5);
  border: 1px solid var(--line);
  background: rgba(var(--color-white-rgb), 0.7);
}
.pg-bo-col h3 {
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.pg-bo-col--easy {
  border-top: 3px solid var(--accent-strong);
}
.pg-bo-col--review {
  border-top: 3px solid var(--color-line-strong);
}
.pg-bo-col--tool {
  border-top: 3px solid var(--color-graphite);
  background: rgba(var(--color-ice-rgb), 0.5);
}
.pg-bo-col-list {
  display: grid;
  gap: 0;
  margin-top: var(--space-3);
  list-style: none;
}
.pg-bo-col-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--text-secondary);
  font-size: 13px;
}
.pg-bo-col-list li::before {
  content: "—";
  margin-right: 8px;
  color: var(--accent-ink);
}
.pg-bo-lock {
  display: grid;
  grid-template-columns: minmax(0, 0.26fr) minmax(0, 0.74fr);
  gap: var(--space-5);
  margin-top: var(--space-6);
  padding: var(--space-5);
  border: 1px solid var(--line);
  background: rgba(var(--color-cyan-rgb), 0.06);
}
.pg-bo-lock h3 {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.pg-bo-lock p {
  max-width: 78ch;
  color: var(--text-secondary);
  font-size: 13.5px;
}
.pg-bo-plates {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-7);
  list-style: none;
}
.pg-bo-plate figure {
  margin: 0;
}
.pg-bo-plate img {
  width: 100%;
  aspect-ratio: 1 / 1;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--panel-soft);
  object-fit: contain;
}
.pg-bo-plate figcaption {
  margin-top: 6px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.04em;
  text-align: center;
  text-transform: uppercase;
}

/* ---- Customization base ---- */
.pg-bo-case-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(30px, 5vw, 66px);
  align-items: center;
}
.pg-bo-case-copy h2 {
  max-width: 19ch;
  margin-top: var(--space-2);
}
.pg-bo-case-copy p {
  max-width: 58ch;
  margin-top: var(--space-4);
  color: var(--text-secondary);
}
.pg-bo-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
}
.pg-bo-metric {
  padding-top: var(--space-4);
  border-top: 2px solid var(--accent-strong);
}
.pg-bo-metric dt {
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.pg-bo-metric dd {
  margin-top: var(--space-2);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.pg-bo-metric dd span {
  color: var(--text-secondary);
  font-size: 10px;
  letter-spacing: 0;
}
.pg-bo-case-media {
  margin: 0;
  padding: clamp(18px, 2.6vw, 30px);
  border: 1px solid var(--line);
  background:
    radial-gradient(70% 70% at 50% 50%, rgba(var(--color-white-rgb), 0.96), transparent 72%),
    var(--panel-soft);
  box-shadow: var(--shadow-lift);
}
.pg-bo-case-media img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: contain;
  filter: drop-shadow(var(--shadow-object));
}
.pg-bo-case-media figcaption {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--line-soft);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ---- FAQ ---- */
.pg-bo-faq-list {
  max-width: 860px;
  border-top: 1px solid var(--line);
}
.pg-bo-faq-item {
  border-bottom: 1px solid var(--line);
}
.pg-bo-faq-item summary {
  position: relative;
  padding: var(--space-4) 40px var(--space-4) 0;
  cursor: pointer;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.4;
  list-style: none;
}
.pg-bo-faq-item summary::-webkit-details-marker {
  display: none;
}
.pg-bo-faq-item summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  color: var(--accent-ink);
  font-family: var(--font-mono);
  font-size: 18px;
  transform: translateY(-50%);
}
.pg-bo-faq-item[open] summary::after {
  content: "−";
}
.pg-bo-faq-item p {
  max-width: 74ch;
  padding: 0 40px var(--space-4) 0;
  color: var(--text-secondary);
  font-size: 13.5px;
  line-height: 1.65;
}

/* ---- CTA ---- */
.pg-bo-cta-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-top: var(--space-7);
  border-top: 1px solid var(--line-strong);
}
.pg-bo-cta-inner h2 {
  max-width: 18ch;
  margin-top: var(--space-2);
}
.pg-bo-cta-inner p {
  max-width: 52ch;
  margin-top: var(--space-3);
  color: var(--text-secondary);
}

/* ---- Responsive ---- */
@media (max-width: 1020px) {
  .pg-bo-hero-grid,
  .pg-bo-gate-grid,
  .pg-bo-case-grid {
    grid-template-columns: 1fr;
  }
  .pg-bo-hero-media {
    max-width: 560px;
  }
  .pg-bo-scope-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 760px) {
  .pg-bo-matrix-grid {
    grid-template-columns: 1fr;
  }
  .pg-bo-lock {
    grid-template-columns: 1fr;
  }
  .pg-bo-metrics {
    grid-template-columns: 1fr;
  }
  .pg-bo-cta-inner {
    display: grid;
  }
  .pg-bo-plates {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .pg-bo-scope {
    display: none;
  }
}
@media (max-width: 480px) {
  .pg-bo-scope-grid {
    grid-template-columns: 1fr;
  }
}