/* ============================================================
   STEMMA — landing.css
   Marketing landing page. Mobile-first, max 480px.
   Neo-Brutalism aesthetic — consistent with Phase 19 app design.
   ============================================================ */

/* ── Landing header (top bar — overrides base nav) ── */
.landing-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  max-width: 480px;
  margin: 0 auto;
  border-bottom: 2px solid var(--color-border-dark);
}
.landing-header__brand {
  font-size: 1.5rem;
}
.landing-header__signin {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
}
.landing-header__signin:hover {
  text-decoration: underline;
}

/* ── Hero ── */
.landing-hero {
  padding: 48px 0 40px;
  text-align: center;
}
.landing-hero__eyebrow {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 16px;
}
.landing-hero__headline {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-text);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.landing-hero__subhead {
  font-size: 1rem;
  line-height: 1.55;
  color: var(--color-text-muted);
  margin-bottom: 32px;
  max-width: 360px;
  margin-left: auto;
  margin-right: auto;
}
.landing-hero__caption {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 12px;
}

/* ── Aha! visual ── */
.landing-aha {
  padding: 40px 0;
  border-top: 2px solid var(--color-border-dark);
}

.root-diagram {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
}

.root-diagram__center {
  background: var(--color-primary);
  color: #fff;
  padding: 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.root-diagram__badge {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.7;
}
.root-diagram__root {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}
.root-diagram__origin {
  font-size: 0.875rem;
  opacity: 0.85;
}

.root-diagram__words {
  display: flex;
  flex-direction: column;
}
.root-diagram__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 20px;
  border-top: 1px solid var(--color-border-dark);
}
.root-diagram__item:first-child {
  border-top: none;
}
.root-diagram__derived {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
}
.root-diagram__def {
  font-size: 0.825rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* Root fragment highlight */
.root-mark {
  background: none;
  color: var(--color-primary);
  font-weight: 900;
}

/* ── How it works ── */
.landing-how {
  padding: 40px 0;
  border-top: 2px solid var(--color-border-dark);
}

.landing-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.landing-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.landing-step__num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}
.landing-step__body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 4px;
}
.landing-step__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
}
.landing-step__desc {
  font-size: 0.875rem;
  line-height: 1.5;
}

/* ── Final CTA ── */
.landing-final-cta {
  padding: 40px 0 16px;
  border-top: 2px solid var(--color-border-dark);
  display: flex;
  flex-direction: column;
  gap: 16px;
  text-align: center;
}
.landing-final-cta__stat {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.landing-final-cta__links {
  line-height: 1.5;
}