/* ─────────────────────────────────────────────────────────────
 * layout.css — Structural primitives
 * .shell (container) · .hero · .section · .index ·
 * .bento (grid) · .footer (wrapper).
 * Component visuals live in components.css.
 * ───────────────────────────────────────────────────────────── */

/* ── Container ──────────────────────────────────────── */
.shell {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ── Hero ───────────────────────────────────────────── */
.hero {
  position: relative;
  padding: clamp(5rem, 9vw, 7rem) 0 clamp(2rem, 3.5vw, 3.5rem);
}

/* Horizon glow — signature 21st.dev/SaaS premium look.
   Big soft radial ellipse anchored at the bottom edge. */
.hero::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -55%;
  width: 130%;
  height: 540px;
  transform: translateX(-50%);
  background: radial-gradient(
    ellipse 50% 50% at 50% 50%,
    rgb(var(--accent-rgb) / 0.24) 0%,
    rgb(var(--accent-alt-rgb) / 0.10) 45%,
    transparent 72%
  );
  filter: blur(30px);
  pointer-events: none;
  z-index: -1;
}

/* ── Section wrappers ───────────────────────────────── */
.section {
  padding: clamp(4rem, 8vw, 7rem) 0;
}

.index {
  padding: clamp(2rem, 5vw, 4rem) 0;
}

.method {
  padding: clamp(3rem, 6vw, 5rem) 0;
}

/* ── Section header (eyebrow, title, desc) ─────────── */
.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: var(--t-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--violet-400);
}

.section-eyebrow::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--violet-400);
}

.section-title {
  max-width: 22ch;
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-size: var(--t-h2);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.035em;
}

.section-title em {
  font-style: normal;
  font-weight: 400;
  color: var(--text-dim);
}

.section-desc {
  max-width: 58ch;
  margin: 0;
  color: var(--text-soft);
  font-size: var(--t-lead);
}

.section-desc kbd {
  padding: 0.1rem 0.4rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.8em;
}

/* ── Bento grid ─────────────────────────────────────── */
.bento {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-auto-rows: minmax(180px, auto);
  gap: 1rem;
  /* NOTE: content-visibility removed on purpose — combined with the
     view-timeline card reveal it collapsed section height and left
     cards stuck at opacity:0 when jumping via anchor (TOC links).
     86 lightweight cards (no images) don't need it. */
}

/* ── Footer wrapper ─────────────────────────────────── */
.footer {
  margin-top: 6rem;
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-base {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: var(--t-xs);
  color: var(--text-faint);
}