:root {
  --ab-bg: #eaf5f8;
  --ab-panel: #fbffff;
  --ab-glass: rgba(255, 255, 255, 0.66);
  --ab-ink: #251934;
  --ab-muted: #65717d;
  --ab-rule: #bfd9df;
  --ab-cyan: #16abc0;
  --ab-coral: #ef6f67;
  --ab-green: #55a96a;
  --ab-lilac: #dcd3ff;
  --ab-shadow: rgba(37, 25, 52, 0.13);
  --ab-display: "Space Grotesk", Sora, "Trebuchet MS", "Segoe UI", sans-serif;
  --ab-body: "Atkinson Hyperlegible", "Segoe UI", Verdana, Geneva, sans-serif;
  --ab-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    linear-gradient(90deg, rgba(22,171,192,0.08) 1px, transparent 1px),
    linear-gradient(180deg, rgba(37,25,52,0.06) 1px, transparent 1px),
    radial-gradient(circle at 12% 8%, rgba(220,211,255,0.95), transparent 28rem),
    radial-gradient(circle at 86% 20%, rgba(85,169,106,0.16), transparent 25rem),
    var(--ab-bg);
  background-size: 46px 46px, 46px 46px, auto, auto, auto;
  color: var(--ab-ink);
  font-family: var(--ab-body);
}

a { color: inherit; }

.ab-site-shell,
.ab-article-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.ab-mast {
  min-height: 72vh;
  padding: clamp(32px, 7vw, 82px) 0 42px;
  display: grid;
  align-content: center;
  position: relative;
}

.ab-bellline {
  display: flex;
  gap: 11px;
  align-items: flex-end;
  margin-bottom: 28px;
}

.ab-bellline span {
  width: 13px;
  border: 2px solid var(--ab-ink);
  border-radius: 99px 99px 8px 8px;
  background: var(--ab-panel);
  box-shadow: 0 8px 0 rgba(22,171,192,0.18);
}

.ab-bellline span:nth-child(1) { height: 25px; }
.ab-bellline span:nth-child(2) { height: 42px; border-color: var(--ab-cyan); }
.ab-bellline span:nth-child(3) { height: 31px; border-color: var(--ab-coral); }
.ab-bellline span:nth-child(4) { height: 55px; border-color: var(--ab-green); }
.ab-bellline span:nth-child(5) { height: 36px; }

.ab-kicker,
.ab-section-label,
.ab-card-meta,
.ab-byline,
.ab-article-meta {
  font-family: var(--ab-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  color: var(--ab-muted);
}

.ab-mast h1 {
  max-width: 980px;
  margin: 0;
  font-family: var(--ab-display);
  font-size: clamp(4rem, 12vw, 10.8rem);
  line-height: 0.82;
  letter-spacing: -0.085em;
  font-weight: 800;
}

.ab-dek {
  max-width: 760px;
  margin: 28px 0 22px;
  font-size: clamp(1.08rem, 2vw, 1.45rem);
  line-height: 1.55;
  color: #3d4652;
}

.ab-byline strong { color: var(--ab-ink); }

.ab-thresholds {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(360px, 1.1fr);
  gap: 22px;
  align-items: stretch;
  margin: 0 0 22px;
}

.ab-threshold-copy,
.ab-feature-scene,
.ab-signal-taxonomy,
.ab-post-card,
.ab-article-header,
.ab-article-body,
.ab-right-register {
  background: var(--ab-glass);
  border: 1px solid rgba(191,217,223,0.95);
  box-shadow: 0 22px 55px var(--ab-shadow);
  backdrop-filter: blur(16px);
}

.ab-threshold-copy {
  border-radius: 34px 10px 34px 34px;
  padding: clamp(24px, 4vw, 42px);
}

.ab-threshold-copy h2,
.ab-feature h2,
.ab-archive-head h2,
.ab-signal-taxonomy h3,
.ab-right-register h2 {
  font-family: var(--ab-display);
  letter-spacing: -0.04em;
  line-height: 0.95;
  margin: 0;
}

.ab-threshold-copy h2 { font-size: clamp(2.1rem, 4vw, 4.3rem); }
.ab-threshold-copy p:last-child,
.ab-feature p,
.ab-right-register p {
  color: #46515f;
  line-height: 1.62;
  font-size: 1rem;
}

.ab-threshold-map {
  min-height: 330px;
  padding: 22px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  border: 1px solid var(--ab-rule);
  border-radius: 12px 42px 42px 12px;
  background: linear-gradient(135deg, rgba(255,255,255,0.42), rgba(22,171,192,0.10));
  overflow: hidden;
}

.ab-membrane {
  position: relative;
  border-left: 2px solid rgba(22,171,192,0.46);
  border-right: 1px dashed rgba(37,25,52,0.2);
  border-radius: 26px;
  background: rgba(255,255,255,0.35);
  padding: 18px 12px;
}

.ab-membrane b {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--ab-display);
  font-size: clamp(1.25rem, 2vw, 2rem);
  letter-spacing: -0.04em;
}

.ab-membrane i {
  position: absolute;
  left: 50%;
  bottom: 18px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ab-coral);
  box-shadow: 0 -46px 0 var(--ab-cyan), 0 -102px 0 var(--ab-green), 0 -158px 0 var(--ab-lilac);
}

.ab-membrane:nth-child(2) i { bottom: 42px; }
.ab-membrane:nth-child(3) i { bottom: 76px; }
.ab-membrane:nth-child(4) i { bottom: 112px; }

.ab-chip-bay {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 54px;
}

.ab-chip-bay a,
.ab-chip-bay span {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 13px 6px;
  border: 1px solid rgba(37,25,52,0.18);
  border-radius: 999px;
  background: rgba(255,255,255,0.62);
  color: #394553;
  text-decoration: none;
  font-size: 0.88rem;
}

.ab-feature {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 22px;
  margin-bottom: 68px;
}

.ab-feature-scene {
  padding: clamp(26px, 5vw, 58px);
  border-radius: 48px 48px 14px 48px;
}

.ab-feature h2 { font-size: clamp(2.4rem, 5vw, 5.6rem); max-width: 850px; }
.ab-feature p { max-width: 720px; margin-top: 24px; }

.ab-signal-taxonomy {
  padding: 26px;
  border-radius: 14px 38px 38px 38px;
  align-self: end;
}

.ab-signal-taxonomy h3 { font-size: 2rem; }
.ab-signal-taxonomy ul { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 13px; }
.ab-signal-taxonomy li { display: grid; grid-template-columns: 38px 1fr; gap: 10px; line-height: 1.35; }
.ab-signal-taxonomy li span { font-family: var(--ab-mono); color: var(--ab-cyan); }

.ab-archive-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
  margin-bottom: 20px;
}

.ab-archive-head h2 { font-size: clamp(2rem, 4vw, 4.4rem); }

.ab-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding-bottom: 80px;
}

.ab-post-card {
  border-radius: 30px;
  overflow: hidden;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.ab-post-card:hover { transform: translateY(-4px); box-shadow: 0 30px 70px rgba(37,25,52,0.18); }

.ab-card-link {
  display: grid;
  min-height: 100%;
  padding: 18px 18px 20px;
  text-decoration: none;
}

.ab-card-gate {
  height: 54px;
  display: grid;
  grid-template-columns: 0.8fr 1.1fr 0.55fr;
  gap: 8px;
  margin-bottom: 18px;
}

.ab-card-gate span {
  border-radius: 999px;
  border: 1px solid rgba(37,25,52,0.18);
  background: linear-gradient(90deg, rgba(22,171,192,0.22), rgba(255,255,255,0.5));
}
.ab-card-gate span:nth-child(2) { background: linear-gradient(90deg, rgba(239,111,103,0.24), rgba(255,255,255,0.55)); }
.ab-card-gate span:nth-child(3) { background: linear-gradient(90deg, rgba(85,169,106,0.25), rgba(255,255,255,0.5)); }

.ab-card-meta { display: flex; justify-content: space-between; gap: 14px; margin-bottom: 20px; }

.ab-post-card h3 {
  margin: 0 0 12px;
  font-family: var(--ab-display);
  font-size: clamp(1.45rem, 2vw, 2.15rem);
  line-height: 0.98;
  letter-spacing: -0.045em;
}

.ab-post-card p {
  margin: 0;
  line-height: 1.55;
  color: #4b5563;
}

.ab-commit-trace {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-top: 24px;
}

.ab-commit-trace i {
  height: 9px;
  flex: 1;
  border-radius: 99px;
  background: var(--ab-rule);
}
.ab-commit-trace i:nth-child(1) { background: var(--ab-cyan); flex-basis: 22%; }
.ab-commit-trace i:nth-child(2) { background: var(--ab-coral); flex-basis: 12%; }
.ab-commit-trace i:nth-child(3) { background: var(--ab-lilac); flex-basis: 28%; }
.ab-commit-trace i:nth-child(4) { background: var(--ab-green); flex-basis: 38%; }

.ab-article-shell { padding: 28px 0 84px; }

.ab-article-topline {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
  font-family: var(--ab-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.74rem;
  color: var(--ab-muted);
}

.ab-article-topline a { text-decoration: none; border-bottom: 1px solid currentColor; }

.ab-replay-corridor {
  display: grid;
  grid-template-columns: 118px minmax(0, 740px) minmax(220px, 300px);
  gap: 20px;
  align-items: start;
}

.ab-article-header {
  grid-column: 1 / -1;
  padding: clamp(26px, 5vw, 58px);
  border-radius: 44px 44px 12px 44px;
}

.ab-article-header h1 {
  max-width: 960px;
  margin: 0 0 22px;
  font-family: var(--ab-display);
  font-size: clamp(3rem, 7vw, 7.4rem);
  line-height: 0.88;
  letter-spacing: -0.075em;
}

.ab-left-rail {
  position: sticky;
  top: 20px;
  display: grid;
  gap: 16px;
  padding-top: 12px;
}

.ab-left-rail span {
  min-height: 92px;
  display: flex;
  align-items: center;
  justify-content: center;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  border-radius: 999px;
  border: 1px solid var(--ab-rule);
  background: rgba(255,255,255,0.52);
  font-family: var(--ab-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.68rem;
  color: #4a5764;
}

.ab-article-body {
  padding: clamp(26px, 5vw, 54px);
  border-radius: 14px 42px 42px 42px;
  font-size: 1.05rem;
  line-height: 1.75;
}

.ab-article-body > *:first-child { margin-top: 0; }
.ab-article-body h2,
.ab-article-body h3 {
  font-family: var(--ab-display);
  letter-spacing: -0.04em;
  line-height: 1.02;
  margin-top: 2.1em;
}
.ab-article-body h2 { font-size: 2.2rem; }
.ab-article-body h3 { font-size: 1.55rem; }
.ab-article-body p { margin: 1.15em 0; }
.ab-article-body ul,
.ab-article-body ol { padding-left: 1.25rem; }
.ab-article-body li { margin: 0.55em 0; }
.ab-article-body blockquote {
  margin: 2rem 0;
  padding: 1.1rem 1.25rem;
  border-left: 6px solid var(--ab-coral);
  background: rgba(239,111,103,0.08);
  border-radius: 0 22px 22px 0;
}

.ab-right-register {
  position: sticky;
  top: 20px;
  padding: 22px;
  border-radius: 34px 12px 34px 34px;
}

.ab-right-register h2 { font-size: 1.75rem; }
.ab-right-register p { font-size: 0.94rem; }

@media (max-width: 940px) {
  .ab-thresholds,
  .ab-feature,
  .ab-replay-corridor { grid-template-columns: 1fr; }
  .ab-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ab-left-rail,
  .ab-right-register { position: static; }
  .ab-left-rail { grid-template-columns: repeat(4, 1fr); }
  .ab-left-rail span { writing-mode: horizontal-tb; transform: none; min-height: 44px; }
}

@media (max-width: 640px) {
  .ab-site-shell,
  .ab-article-shell { width: min(100% - 22px, 1180px); }
  .ab-mast h1 { font-size: clamp(3.3rem, 18vw, 5.5rem); }
  .ab-threshold-map { grid-template-columns: 1fr; }
  .ab-membrane { min-height: 86px; }
  .ab-membrane b { writing-mode: horizontal-tb; transform: none; }
  .ab-membrane i { left: auto; right: 24px; bottom: 30px; box-shadow: -42px 0 0 var(--ab-cyan), -92px 0 0 var(--ab-green), -142px 0 0 var(--ab-lilac); }
  .ab-card-grid { grid-template-columns: 1fr; }
  .ab-archive-head { display: block; }
  .ab-left-rail { grid-template-columns: 1fr 1fr; }
}