/* ============================================================
   ALTMATTER SYSTEMS — sections.css (part 2: page sections)
   ============================================================ */

.section { padding-block: clamp(var(--space-16), 9vw, var(--space-32)); }
.section-tight { padding-block: clamp(var(--space-12), 6vw, var(--space-20)); }

.section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: clamp(var(--space-10), 6vw, var(--space-16));
  max-width: 60ch;
}
.section-head h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
}
.section-head p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

/* ---------- Capabilities: asymmetric 1 + 3 ---------- */

.cap-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-5);
}
.cap-card {
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  padding: clamp(var(--space-6), 3vw, var(--space-10));
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: relative;
  overflow: hidden;
}
.cap-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.cap-card p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.65;
}
.cap-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.12em;
}

.cap-feature {
  grid-column: span 7;
  grid-row: span 2;
  justify-content: flex-end;
  min-height: 460px;
  background-size: cover;
  background-position: center;
  color: #eceefb;
  border: none;
}
.cap-feature::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(8, 10, 24, 0.88) 0%, rgba(8, 10, 24, 0.35) 55%, rgba(8, 10, 24, 0.15) 100%);
}
.cap-feature > * { position: relative; }
.cap-feature h3 { font-size: var(--text-xl); color: #f4f5fd; max-width: 18ch; }
.cap-feature p { color: rgba(228, 230, 245, 0.82); max-width: 44ch; font-size: var(--text-base); }
.cap-feature .cap-num { color: rgba(228, 230, 245, 0.6); }

.cap-side { grid-column: span 5; }

@media (max-width: 900px) {
  .cap-grid { grid-template-columns: 1fr; }
  .cap-feature, .cap-side { grid-column: 1 / -1; grid-row: auto; }
  .cap-feature { min-height: 380px; }
}

/* ---------- Focus areas: numbered ledger rows ---------- */

.ledger { border-top: 1px solid var(--color-divider); }
.ledger-row {
  display: grid;
  grid-template-columns: 72px 1fr minmax(0, 1.2fr);
  gap: var(--space-6);
  align-items: baseline;
  padding-block: clamp(var(--space-6), 4vw, var(--space-10));
  border-bottom: 1px solid var(--color-divider);
}
.ledger-row .num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
}
.ledger-row h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.015em;
}
.ledger-row p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
}
@media (max-width: 760px) {
  .ledger-row { grid-template-columns: 48px 1fr; }
  .ledger-row p { grid-column: 2; }
}

/* ---------- Full-bleed image band ---------- */

.band {
  position: relative;
  min-height: 480px;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: flex-end;
}
.band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(7, 8, 18, 0.82), rgba(7, 8, 18, 0.1) 60%);
}
.band-inner {
  position: relative;
  width: 100%;
  padding-block: clamp(var(--space-10), 6vw, var(--space-16));
}
.band blockquote {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: #f2f3fa;
  max-width: 26ch;
}
.band figcaption {
  margin-top: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(235, 236, 246, 0.65);
}

/* ---------- Process ---------- */

.process {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.4fr);
  gap: clamp(var(--space-10), 6vw, var(--space-24));
  align-items: start;
}
.process-sticky { position: sticky; top: 110px; }
.process-sticky h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-top: var(--space-4);
}
.process-sticky p {
  margin-top: var(--space-5);
  color: var(--color-text-muted);
}

.step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: var(--space-5);
  padding-block: var(--space-8);
  border-bottom: 1px solid var(--color-divider);
}
.step:first-child { padding-top: 0; }
.step-marker {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid oklch(from var(--color-text) l c h / 0.2);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.step h3 {
  font-size: var(--text-lg);
  font-weight: 700;
  font-family: var(--font-display);
}
.step p {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.65;
}
@media (max-width: 860px) {
  .process { grid-template-columns: 1fr; }
  .process-sticky { position: static; }
}

/* ---------- About / registry ---------- */

.about {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: clamp(var(--space-10), 6vw, var(--space-24));
  align-items: start;
}
.about h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-top: var(--space-4);
}
.about .lede {
  margin-top: var(--space-5);
  font-size: var(--text-lg);
  color: var(--color-text);
  line-height: 1.5;
  max-width: 40ch;
}
.about .body {
  margin-top: var(--space-4);
  color: var(--color-text-muted);
}

.registry {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: clamp(var(--space-6), 3vw, var(--space-8));
}
.registry h3 {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
}
.registry dl { margin-top: var(--space-2); }
.registry .row {
  display: grid;
  grid-template-columns: minmax(110px, 0.8fr) 1.4fr;
  gap: var(--space-4);
  padding-block: var(--space-3);
  border-bottom: 1px solid var(--color-divider);
}
.registry .row:last-child { border-bottom: none; }
.registry dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  padding-top: 2px;
}
.registry dd { font-size: var(--text-sm); color: var(--color-text); }
@media (max-width: 860px) {
  .about { grid-template-columns: 1fr; }
}

/* ---------- Contact ---------- */

.contact {
  background: var(--color-surface);
  border-block: 1px solid var(--color-divider);
}
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: clamp(var(--space-10), 6vw, var(--space-24));
  align-items: start;
}
.contact h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-top: var(--space-4);
  max-width: 16ch;
}
.contact .contact-note {
  margin-top: var(--space-5);
  color: var(--color-text-muted);
  max-width: 42ch;
}
.contact-channels { display: grid; gap: var(--space-2); margin-top: var(--space-2); }
.channel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid oklch(from var(--color-text) l c h / 0.1);
  text-decoration: none;
  color: var(--color-text);
  background: var(--color-surface-2);
}
.channel:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}
.channel .k {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}
.channel .v { font-size: var(--text-sm); font-weight: 600; }
.channel svg { color: var(--color-text-faint); flex-shrink: 0; }
.channel:hover svg { color: var(--color-primary); }
.channel div { display: grid; gap: 2px; }

/* ---------- Footer ---------- */

.footer { padding-block: var(--space-12) var(--space-10); }
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  align-items: flex-start;
  justify-content: space-between;
}
.footer-brand { display: grid; gap: var(--space-3); color: var(--color-text); }
.footer-brand p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  max-width: 34ch;
}
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}
.footer-col ul { display: grid; gap: var(--space-2); }
.footer-col a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer-col a:hover { color: var(--color-text); }
.footer-legal {
  margin-top: var(--space-10);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-divider);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* ---------- Reveal on scroll ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}