:root {
  --oa-bg: #f5f8fc;
  --oa-surface: #ffffff;
  --oa-surface-soft: #f7fafc;
  --oa-line: rgba(16, 33, 51, 0.1);
  --oa-line-strong: rgba(16, 33, 51, 0.16);
  --oa-ink: #102133;
  --oa-muted: #5b6a7d;
  --oa-blue: #2457d6;
  --oa-blue-dark: #163a88;
  --oa-shadow: 0 20px 44px rgba(15, 25, 42, 0.08);
}

body.c-option-a {
  color: var(--oa-ink);
  background: linear-gradient(180deg, #f6f9fc 0%, #ffffff 48%, #f2f7fb 100%);
}

body.c-option-a .c-site-header {
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--oa-line);
}

body.c-option-a .c-btn--solid {
  background: linear-gradient(135deg, var(--oa-blue-dark), var(--oa-blue));
}

body.c-option-a .c-btn--ghost {
  border-color: var(--oa-line-strong);
  background: #fff;
}

body.c-option-a .c-main-nav a,
body.c-option-a .c-mobile-nav__inner a,
body.c-option-a .c-overline,
body.c-option-a .c-section__copy,
body.c-option-a .c-site-footer__meta,
body.c-option-a .c-site-footer__links a,
body.c-option-a .c-site-footer__copy,
body.c-option-a .c-breadcrumb,
body.c-option-a .c-home-hero__copy,
body.c-option-a .c-card__subtitle,
body.c-option-a .c-docs__meta,
body.c-option-a .c-product-side__meta,
body.c-option-a .c-product-side__variant-note {
  color: var(--oa-muted);
}

.oa-hero {
  padding: 2rem 0 3.5rem;
}

.oa-grid,
.oa-grid-2,
.oa-grid-3,
.oa-grid-4,
.oa-product-layout,
.oa-hero-band,
.oa-kpi-grid,
.oa-summary-grid,
.oa-form-grid,
.oa-brand-row {
  display: grid;
  gap: 1rem;
}

.oa-grid { grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.75fr); align-items: start; }
.oa-grid-2, .oa-product-layout { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.oa-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.oa-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.oa-kpi-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.oa-summary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.oa-form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.oa-brand-row { grid-template-columns: repeat(5, minmax(0, 1fr)); }

.oa-panel,
.oa-card,
.oa-strip,
.oa-stage,
.oa-gallery,
.oa-summary,
.oa-doc-panel,
.oa-rfq-panel,
.oa-spec-panel {
  background: var(--oa-surface);
  border: 1px solid var(--oa-line);
  border-radius: 24px;
  box-shadow: var(--oa-shadow);
  transition: border-color 220ms ease, box-shadow 220ms ease;
}

.oa-card:hover {
  border-color: rgba(36, 87, 214, 0.22);
  box-shadow: 0 24px 50px rgba(15, 25, 42, 0.12);
}

.oa-panel,
.oa-card,
.oa-stage,
.oa-gallery,
.oa-summary,
.oa-doc-panel,
.oa-rfq-panel,
.oa-spec-panel { padding: 1.5rem; }

.oa-hero-copy h1,
.oa-section-title,
.oa-product-title {
  margin: 0.7rem 0 0.9rem;
  font-family: var(--font-display);
  color: var(--oa-ink);
}

.oa-hero-copy h1 { font-size: clamp(2.25rem, 4.5vw, 4rem); line-height: 1.02; max-width: 11ch; }
.oa-section-title { font-size: clamp(1.55rem, 2.8vw, 2.4rem); line-height: 1.1; }
.oa-product-title { font-size: clamp(2rem, 3vw, 3rem); line-height: 1.05; margin: 0.5rem 0 0.75rem; }

.oa-lead,
.oa-muted,
.oa-card p,
.oa-step span,
.oa-brand-pill span {
  color: var(--oa-muted);
  line-height: 1.65;
}

.oa-badge,
.oa-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
}

.oa-badge {
  background: rgba(36, 87, 214, 0.08);
  color: var(--oa-blue-dark);
}

.oa-pill {
  border: 1px solid var(--oa-line);
  background: var(--oa-surface-soft);
  color: var(--oa-muted);
}

.oa-actions,
.oa-inline {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.oa-actions { margin-top: 1.5rem; }

.oa-search-wrap {
  margin-top: 1.5rem;
  padding: 1rem;
  border-radius: 20px;
  border: 1px solid var(--oa-line);
  background: var(--oa-surface-soft);
}

.oa-search-wrap .c-search { margin-top: 0.8rem; }

.oa-search-wrap .c-search__input-wrap,
.oa-form-grid .c-input,
.oa-form-grid .c-textarea {
  border-color: var(--oa-line);
  background: #fff;
}

.oa-hero-side {
  display: grid;
  gap: 1rem;
}

.oa-checklist,
.oa-list,
.oa-doc-list { list-style: none; margin: 0; padding: 0; }

.oa-checklist,
.oa-list { display: grid; gap: 0.8rem; }

.oa-checklist li,
.oa-list li,
.oa-step,
.oa-spec-item,
.oa-summary-metric,
.oa-brand-pill {
  padding: 0.9rem 1rem;
  border-radius: 18px;
  border: 1px solid var(--oa-line);
  background: var(--oa-surface-soft);
}

.oa-brand-pill {
  display: grid;
  place-items: center;
  min-height: 64px;
  font-family: var(--font-display);
  color: var(--oa-ink);
}

.oa-section { padding: 1rem 0 2.75rem; }

.oa-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
  margin-bottom: 1.25rem;
}

.oa-card h3,
.oa-card h4 { margin: 0.8rem 0 0.45rem; color: var(--oa-ink); }

.oa-icon {
  display: inline-flex;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: rgba(36, 87, 214, 0.08);
  color: var(--oa-blue-dark);
  font-weight: 800;
}

.oa-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.oa-stage-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.oa-step strong,
.oa-summary-metric strong,
.oa-spec-item strong { color: var(--oa-ink); display: block; }

.oa-summary {
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.oa-gallery-main {
  padding: 1rem;
  border-radius: 20px;
  background: var(--oa-surface-soft);
  border: 1px solid var(--oa-line);
}

.oa-gallery-rail {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.oa-gallery-rail img {
  border-radius: 16px;
  border: 1px solid var(--oa-line);
  background: #fff;
  padding: 0.4rem;
}

.oa-summary-grid,
.oa-spec-stack { margin-top: 1rem; }

.oa-summary-metric span,
.oa-spec-item span,
.oa-doc-summary { color: var(--oa-muted); font-size: 0.86rem; }

.oa-spec-stack { display: grid; gap: 0.75rem; }

.oa-doc-actions {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  padding: 1rem;
  border-radius: 18px;
  border: 1px solid var(--oa-line);
  background: var(--oa-surface-soft);
}

.oa-doc-status {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border-radius: 16px;
  background: rgba(36, 87, 214, 0.08);
  color: var(--oa-blue-dark);
}

.oa-doc-status.is-error {
  background: rgba(188, 44, 78, 0.08);
  color: #a21f42;
}

.oa-form-grid .c-form-row--full { grid-column: 1 / -1; }
.oa-form-grid label { display: block; margin-bottom: 0.45rem; color: var(--oa-ink); font-weight: 600; }

.oa-grid-3 .oa-card img {
  width: 100%;
  border-radius: 14px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
  margin-bottom: 0.25rem;
}

@media (max-width: 1100px) {
  .oa-grid,
  .oa-product-layout,
  .oa-grid-3,
  .oa-grid-2,
  .oa-stage-grid,
  .oa-brand-row,
  .oa-summary-grid,
  .oa-kpi-grid,
  .oa-form-grid { grid-template-columns: 1fr; }
  .oa-grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .oa-grid-4 { grid-template-columns: 1fr; }
  .oa-head,
  .oa-doc-actions { flex-direction: column; align-items: start; }
  .oa-summary { position: static; }
}