/* ── Variation B — Technical / Architecture-forward ── */

.variation-b .vb-nav { background: rgba(251, 250, 247, 0.92); backdrop-filter: blur(8px); }

/* Hero */
.variation-b .vb-hero {
  background: var(--paper);
  padding: 80px 0 96px;
  position: relative;
  overflow: hidden;
}
.variation-b .vb-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--n-100) 1px, transparent 1px),
    linear-gradient(90deg, var(--n-100) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.5;
  mask-image: radial-gradient(ellipse at center, #000 0%, transparent 75%);
  pointer-events: none;
}
.variation-b .vb-hero > .container { position: relative; z-index: 1; }

.variation-b .vb-hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 56px;
  align-items: center;
}
.variation-b .vb-hero-body { padding-right: 16px; }

.variation-b .vb-h1 {
  font-size: 64px;
  font-weight: 700;
  letter-spacing: -2.2px;
  line-height: 1.02;
  color: var(--ink);
  margin: 24px 0 28px;
}
.variation-b .vb-sub {
  font-size: 18px;
  line-height: 1.6;
  color: var(--n-600);
  margin-bottom: 36px;
  max-width: 540px;
}
.variation-b .vb-emphasis {
  background: linear-gradient(180deg, transparent 65%, rgba(126, 207, 178, 0.4) 65%);
  font-weight: 500;
  color: var(--green-dark);
}
.variation-b .vb-actions { display: flex; gap: 10px; margin-bottom: 48px; flex-wrap: wrap; }

.variation-b .vb-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding-top: 28px;
  border-top: 1px solid var(--n-100);
}
.variation-b .vb-stats div { display: flex; flex-direction: column; gap: 4px; }
.variation-b .vb-stats dt {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.5px;
  font-feature-settings: 'tnum' 1;
}
.variation-b .vb-stats dd {
  font-size: 12px;
  color: var(--muted);
  font-family: var(--mono);
  letter-spacing: 0.3px;
}

/* Architecture diagram */
.variation-b .vb-arch {
  background: #fff;
  border: 1px solid var(--n-100);
  border-radius: 16px;
  padding: 28px 24px;
  box-shadow: 0 20px 48px -16px rgba(10, 43, 31, 0.12), 0 1px 0 rgba(255,255,255,0.5) inset;
  position: relative;
}
.variation-b .vb-arch::before {
  content: 'GW.REGISTRUM.AI / V1';
  position: absolute;
  top: -10px;
  left: 24px;
  background: #fff;
  padding: 0 10px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--n-500);
  font-weight: 500;
}
.variation-b .vb-arch-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 16px;
  align-items: stretch;
}
.variation-b .vb-arch-col { display: flex; flex-direction: column; gap: 10px; }
.variation-b .vb-arch-col-label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--green);
  font-weight: 500;
  padding-bottom: 6px;
}
.variation-b .vb-arch-col-label.muted { color: var(--muted); text-align: center; }

.variation-b .vb-arch-stack { display: flex; flex-direction: column; gap: 8px; }
.variation-b .vb-node {
  background: #fff;
  border: 1px solid var(--n-100);
  border-radius: 8px;
  padding: 11px 14px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--n-700);
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.1px;
}
.variation-b .vb-node-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
}
.variation-b .vb-node-dot.warn { background: var(--danger); box-shadow: 0 0 0 3px rgba(197, 59, 59, 0.16); }
.variation-b .vb-node.shadow { background: #FBEEEE; border-color: rgba(197, 59, 59, 0.26); color: #9A2E2E; }
.variation-b .vb-node.provider { color: var(--n-600); }

.variation-b .vb-arch-center-col {
  position: relative;
  min-width: 200px;
}
/* arrows between cols */
.variation-b .vb-arch-grid::before,
.variation-b .vb-arch-grid::after {
  content: '';
  position: absolute;
  /* using positioning relative to .vb-arch */
}
.variation-b .vb-arch { position: relative; }

.variation-b .vb-center {
  background: linear-gradient(180deg, var(--navy), #0c352a);
  border-radius: 10px;
  padding: 18px 18px 14px;
  color: #fff;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
  position: relative;
  box-shadow: 0 8px 24px -8px rgba(10, 43, 31, 0.35);
}
.variation-b .vb-center::before,
.variation-b .vb-center::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 30px;
  height: 1px;
  border-top: 1.5px dashed var(--green-200);
}
.variation-b .vb-center::before { left: -30px; }
.variation-b .vb-center::after { right: -30px; }
.variation-b .vb-center-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.variation-b .vb-center-head .brand-mark { color: #fff; font-size: 15px; }
.variation-b .vb-center-head .brand-mark .bm-s,
.variation-b .vb-center-head .brand-mark .bm-n { color: var(--green-bright); }
.variation-b .vb-center-name {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.variation-b .vb-center-name .vb-ai { color: var(--green-bright); }
.variation-b .vb-center-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 12px;
}
.variation-b .vb-center-list li {
  font-family: var(--mono);
  font-size: 12px;
  color: rgba(255,255,255,0.85);
  display: flex;
  align-items: center;
  gap: 8px;
}
.variation-b .vb-tick {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--green-bright);
}
.variation-b .vb-center-foot {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 8px;
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 10.5px;
  color: rgba(255,255,255,0.5);
}
.variation-b .vb-center-foot strong { color: var(--green-bright); font-weight: 500; }

/* Section base */
.variation-b .vb-h2 {
  font-size: 42px;
  font-weight: 700;
  letter-spacing: -1.2px;
  line-height: 1.1;
  color: var(--ink);
}

/* Problem */
.variation-b .vb-problem { background: #fff; border-top: 1px solid var(--n-100); }
.variation-b .vb-problem-grid {
  display: grid;
  grid-template-columns: 5fr 6fr;
  gap: 72px;
  align-items: start;
}
.variation-b .vb-problem-grid > div:first-child .eyebrow { margin-bottom: 24px; }
.variation-b .vb-problem-body { display: flex; flex-direction: column; gap: 20px; }
.variation-b .vb-problem-lede {
  font-size: 19px;
  line-height: 1.6;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -0.2px;
}
.variation-b .vb-problem-body p { font-size: 16px; color: var(--muted); }
.variation-b .vb-problem-body code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--n-50);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--ink);
}
.variation-b .vb-problem-conclusion {
  border-left: 3px solid var(--green);
  padding-left: 16px;
  color: var(--ink) !important;
  font-weight: 500;
  font-size: 16.5px !important;
  margin-top: 8px;
}

/* How */
.variation-b .vb-how {
  background: var(--n-25);
  border-top: 1px solid var(--n-100);
  border-bottom: 1px solid var(--n-100);
}
.variation-b .vb-how-head { margin-bottom: 56px; max-width: 720px; }
.variation-b .vb-how-head .eyebrow { margin-bottom: 16px; }
.variation-b .vb-how-steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  counter-reset: step;
}
.variation-b .vb-how-steps li {
  background: #fff;
  border: 1px solid var(--n-100);
  border-radius: 12px;
  padding: 28px 24px 24px;
  position: relative;
}
.variation-b .vb-step-num {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 1.6px;
  color: var(--green);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--n-100);
  margin-bottom: 18px;
}
.variation-b .vb-how-steps h3 {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.4px;
  color: var(--ink);
  margin-bottom: 10px;
  line-height: 1.25;
}
.variation-b .vb-how-steps p {
  font-size: 14.5px;
  color: var(--muted);
  margin-bottom: 16px;
}
.variation-b .vb-step-code {
  font-family: var(--mono);
  font-size: 11.5px;
  background: var(--navy);
  color: var(--green-bright);
  padding: 10px 12px;
  border-radius: 6px;
  white-space: pre-wrap;
  word-break: break-all;
  line-height: 1.5;
}

/* Features */
.variation-b .vb-features { background: #fff; }
.variation-b .vb-features-head { margin-bottom: 56px; max-width: 720px; }
.variation-b .vb-features-head .eyebrow { margin-bottom: 16px; }
.variation-b .vb-feat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.variation-b .vb-feat {
  background: var(--n-25);
  border: 1px solid var(--n-100);
  border-radius: 14px;
  padding: 32px 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.variation-b .vb-feat-tag {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--green);
}
.variation-b .vb-feat h3 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--ink);
  line-height: 1.2;
  margin-bottom: 4px;
}
.variation-b .vb-feat ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 6px;
}
.variation-b .vb-feat ul li {
  font-size: 14px;
  color: var(--n-600);
  padding-left: 20px;
  position: relative;
  line-height: 1.55;
}
.variation-b .vb-feat ul li::before {
  content: '→';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--green);
  font-weight: 600;
  font-family: var(--mono);
}

/* Footer */
.variation-b .vb-footer {
  background: var(--paper);
  border-top: 1px solid var(--n-100);
  padding: 64px 0 32px;
}
.variation-b .vb-footer-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--n-100);
  margin-bottom: 20px;
}
.variation-b .vb-footer-tag {
  font-size: 14px;
  color: var(--muted);
  margin-top: 16px;
  max-width: 260px;
  line-height: 1.55;
}
.variation-b .vb-footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.variation-b .vb-footer-cols h4 {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 14px;
}
.variation-b .vb-footer-cols ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.variation-b .vb-footer-cols li { font-size: 14px; color: var(--muted); }
.variation-b .vb-footer-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
  font-family: var(--mono);
  letter-spacing: 0.3px;
  gap: 24px;
  flex-wrap: wrap;
}
.variation-b .vb-family {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--n-600);
}
.variation-b .vb-family .bc-mark {
  letter-spacing: -0.01em;
  font-feature-settings: 'tnum' 1;
  color: var(--ink);
}
.variation-b .vb-family .bc-mark .s { color: var(--green); font-weight: 400; }
.variation-b .vb-family .bc-mark .n { color: var(--green); font-weight: 500; }
.variation-b .vb-family .bc-sep { color: var(--n-300); }
.variation-b .vb-family .bc-status {
  font-size: 10px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--green);
  padding: 2px 6px;
  background: var(--green-50);
  border-radius: 100px;
  margin-left: 4px;
}