.container {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--content-pad);
}

section {
  position: relative;
}

.section-pad {
  padding-block: var(--space-2xl);
}

@media (max-width: 720px) {
  .section-pad {
    padding-block: var(--space-xl);
  }
}

.section-head {
  max-width: 640px;
  margin-bottom: var(--space-lg);
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3xs);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.tone-dark .eyebrow {
  color: #5fe0a0;
}

/* ---- Grid helpers ---- */
.grid {
  display: grid;
  gap: var(--space-md);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 980px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ---- Tone blocks (dark ink sections vs. light paper sections) ---- */
.tone-dark {
  background-color: var(--color-ink);
  background-image: linear-gradient(var(--color-ink-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-ink-line) 1px, transparent 1px);
  background-size: 64px 64px;
  color: var(--color-ink-text);
  transition: background-color 0.4s ease;
}

/* Once the page-wide animated grid (js/interactive-grid.js) is up and
   running, dark sections go transparent to reveal it instead of their own
   static background — the canvas paints an identical dark backdrop full
   page height, so this is a seamless handoff, not a visible swap. */
html.webgl-grid-active main .tone-dark,
html.webgl-grid-active footer.tone-dark {
  background-color: transparent;
  background-image: none;
}

.tone-dark .text-muted {
  color: var(--color-ink-text-muted);
}

.tone-light {
  background: var(--color-paper);
  color: var(--color-text);
}

.text-muted {
  color: var(--color-text-muted);
}

.text-center {
  text-align: center;
}

/* ---- Nav ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(11, 18, 32, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--color-ink-line);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-xs);
}

.nav__links {
  display: flex;
  gap: var(--space-md);
  font-size: var(--text-sm);
  color: var(--color-ink-text-muted);
}

.nav__links a {
  transition: color var(--duration-fast) var(--ease-out);
}

.nav__links a:hover {
  color: var(--color-ink-text);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

@media (max-width: 760px) {
  .nav__links {
    display: none;
  }
}

/* ---- Footer ---- */
.footer {
  padding-block: var(--space-lg);
  border-top: 1px solid var(--color-ink-line);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: center;
  justify-content: space-between;
}

.footer__links {
  display: flex;
  gap: var(--space-md);
  font-size: var(--text-sm);
  color: var(--color-ink-text-muted);
}