/* ── Layout ── */
.page {
  max-width: 800px;
  margin: 0 auto;
  padding: 5rem 2rem 4rem;
}

/* ── Hero ── */
.hero {
  text-align: center;
  padding: 0 0 2.5rem;
}

.hero__title {
  font-size: 3.2rem;
  font-weight: var(--heading-weight);
  letter-spacing: var(--heading-spacing);
  line-height: 1.1;
  background: linear-gradient(
    135deg,
    var(--s1) 0%,
    var(--s4) 50%,
    var(--s2) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.hero__subtitle {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}

.hero__desc {
  max-width: 580px;
  margin: 0 auto;
  font-size: 1rem;
  color: var(--text-dim);
  line-height: 1.7;
}

/* ── Divider ── */
.divider {
  height: 1.5rem;
}

/* ── Section ── */
.section {
  padding: 0.5rem 0;
}

.section__label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.section__label--problem {
  color: var(--s1);
}

.section__label--solution {
  color: var(--s3);
}

.section__label--summary {
  color: var(--s2);
}

.section__label--evolution {
  color: var(--s4);
}

/* Rollout progression: hub → hybrid → brain */
.phases {
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.75rem 0;
}
.phase {
  flex: 1 1 0;
  min-width: 180px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.1rem;
}
.phase--full {
  border-color: var(--s3);
}
.phase__tag {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}
.phase__title {
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.phase__text {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.6;
}
.phase__arrow {
  align-self: center;
  color: var(--s4);
  font-weight: 700;
  font-size: 1.1rem;
}

.section__title {
  font-size: 1.5rem;
  font-weight: var(--heading-weight);
  letter-spacing: var(--heading-spacing);
  line-height: 1.25;
  margin-bottom: 1rem;
}

.section__text {
  color: var(--text-dim);
  line-height: 1.7;
  margin-bottom: 1.5rem;
  max-width: 640px;
}

/* ── Brooks Law visualization ── */
.brooks {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  gap: 2rem;
  margin: 2rem 0;
}

.brooks__group {
  text-align: center;
  flex: 0 0 auto;
}

.brooks__group svg {
  display: block;
  margin: 0 auto 0.6rem;
}

.brooks__label {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-dim);
  line-height: 1.4;
}

.brooks__label strong {
  color: var(--s1);
  font-size: 0.95rem;
}

/* ── Formula ── */
.formula {
  text-align: center;
  padding: 1.1rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 1.5rem auto;
  max-width: 360px;
}

.formula__expr {
  font-family: var(--mono);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.02em;
}

.formula__legend {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

/* ── Stats ── */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.stat {
  text-align: center;
  padding: 0.9rem 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.stat__people {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 0.25rem;
}

.stat__connections {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--s1);
}

.stat__unit {
  font-size: 0.62rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

/* ── Note ── */
.note {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
  border-left: 3px solid var(--border);
  padding-left: 1rem;
  margin-top: 1.5rem;
}

/* ── Pain points ── */
.pains {
  display: grid;
  gap: 0.65rem;
  margin: 1.5rem 0;
}

.pain {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.pain__icon {
  font-size: 1.1rem;
  line-height: 1.4;
  flex-shrink: 0;
}

.pain__text {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.pain__text strong {
  color: var(--text);
  font-weight: 600;
}

/* ── Benefits ── */
.benefits {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.benefit {
  padding: 1rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.benefit__icon {
  font-size: 1.15rem;
  margin-bottom: 0.35rem;
}

.benefit__title {
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.benefit__text {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ── Comparison ── */
.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.compare__item {
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
}

.compare__item--old {
  background: var(--bg);
  border: 1.5px dashed var(--border);
}

.compare__item--new {
  background: var(--surface);
  border: 1.5px solid var(--s3);
}

.compare__tag {
  font-family: var(--mono);
  font-size: 0.58rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  display: inline-block;
  padding: 0.18rem 0.45rem;
  border-radius: 4px;
  margin-bottom: 0.5rem;
  color: #fff;
}

.compare__item--old .compare__tag {
  background: var(--accent-muted);
}

.compare__item--new .compare__tag {
  background: var(--s3);
}

.compare__title {
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.compare__text {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ── Agent levels ── */
.levels {
  display: grid;
  gap: 0.65rem;
  margin: 1.5rem 0;
}

.level {
  display: flex;
  gap: 1rem;
  padding: 1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  align-items: flex-start;
}

.level__icon {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--s3);
  flex-shrink: 0;
  margin-top: 0.45rem;
  font-size: 0;
}

.level__body {
  flex: 1;
  min-width: 0;
}

.level__title {
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.level__text {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ── Advantages list ── */
.advantages {
  display: grid;
  gap: 0.5rem;
  margin: 1.5rem 0;
}

.advantage {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.5;
}

.advantage__marker {
  color: var(--s3);
  font-weight: 700;
  flex-shrink: 0;
}

.advantage strong {
  color: var(--text);
  font-weight: 600;
}

/* ── Summary features ── */
.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.feature {
  padding: 1rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.feature__title {
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 0.15rem;
}

.feature__text {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ── Section label variants ── */
.section__label--example {
  color: var(--s2);
}

.section__label--oss {
  color: var(--s4);
}

/* ── Use case steps ── */
.compare__steps {
  display: grid;
  gap: 0.4rem;
  margin-top: 0.65rem;
}

.step {
  font-size: 0.78rem;
  line-height: 1.45;
  padding: 0.4rem 0.65rem;
  border-radius: 6px;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.step::before {
  flex-shrink: 0;
  font-weight: 700;
  font-size: 0.72rem;
}

.step--fail {
  color: var(--text-dim);
  background: rgba(184, 78, 48, 0.06);
}

.step--fail::before {
  content: "✗";
  color: var(--s1);
}

.step--ok {
  color: var(--text-dim);
  background: rgba(106, 128, 72, 0.08);
}

.step--ok::before {
  content: "✓";
  color: var(--s3);
}

/* ── Open Source points ── */
.oss-points {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.oss-point {
  padding: 1rem 1.1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.oss-point__title {
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.oss-point__text {
  font-size: 0.82rem;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ── CTA footer ── */
.cta {
  text-align: center;
  padding: 2.5rem 1.5rem;
  margin-top: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.cta__title {
  font-size: 1.3rem;
  font-weight: var(--heading-weight);
  letter-spacing: var(--heading-spacing);
  margin-bottom: 0.5rem;
}

.cta__text {
  font-size: 0.88rem;
  color: var(--text-dim);
  line-height: 1.6;
  max-width: 400px;
  margin: 0 auto 1.5rem;
}

.cta__actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
}

.cta__btn {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  text-decoration: none;
  padding: 0.6rem 1.5rem;
  border-radius: 8px;
  transition:
    transform 0.15s,
    box-shadow 0.15s;
}

.cta__btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--card-shadow-hover);
}

.cta__btn--primary {
  background: var(--s3);
  color: #fff;
}

.cta__btn--secondary {
  background: transparent;
  color: var(--text-dim);
  border: 1.5px solid var(--border);
}

.cta__btn--secondary:hover {
  border-color: var(--text-muted);
}

/* ── Bridge ── */
.bridge {
  text-align: center;
  padding: 1.5rem 2rem;
  margin: 0.5rem 0;
}

.bridge p {
  font-size: 0.95rem;
  color: var(--text-dim);
  line-height: 1.8;
  max-width: 520px;
  margin: 0 auto;
  font-style: italic;
}

/* ── Graph visualization ── */
.graph-vis {
  display: block;
  max-width: 440px;
  margin: 1.5rem auto 0.5rem;
}

.graph-vis__caption {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin: 0.3rem 0 2rem;
  font-style: italic;
}

/* ── Topology comparison ── */
.topology {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  margin: 2rem 0 0.5rem;
}

.topology__side {
  text-align: center;
  flex: 0 0 auto;
}

.topology__side svg {
  display: block;
  margin: 0 auto 0.5rem;
}

.topology__arrow {
  font-size: 1.5rem;
  color: var(--text-muted);
  font-weight: 300;
  flex-shrink: 0;
}

.topology__label {
  font-family: var(--mono);
}

.topology__formula {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 0.1rem;
}

.topology__count {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-dim);
  line-height: 1.4;
}

.topology__side--problem .topology__count strong {
  color: var(--s1);
  font-size: 0.95rem;
}

.topology__side--solution .topology__count strong {
  color: var(--s3);
  font-size: 0.95rem;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .page {
    padding: 2rem 1rem 3rem;
  }

  .hero__title {
    font-size: 2.2rem;
  }

  .stats,
  .benefits,
  .compare,
  .features,
  .oss-points {
    grid-template-columns: 1fr;
  }

  .brooks {
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
  }

  .topology {
    gap: 0.75rem;
  }

  .cta {
    padding: 2rem 1rem;
  }
}