/* ==========================================================================
   AND Elektrik — Layout primitives
   ========================================================================== */

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

.shell--wide {
  max-width: 1480px;
}

.section {
  position: relative;
  padding-block: var(--section-y);
  isolation: isolate;
}

.section--tight {
  padding-block: calc(var(--section-y) * 0.6);
}

.section--flush-top {
  padding-top: 0;
}

/* Hairline divider that reads like a technical drawing rule */
.section--ruled::before {
  content: "";
  position: absolute;
  inset-inline: var(--shell-pad);
  top: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--line-soft) 12%,
    var(--line) 50%,
    var(--line-soft) 88%,
    transparent
  );
}

/* --- Section heading block ------------------------------------------------ */
.section-head {
  display: grid;
  gap: var(--space-4);
  max-width: 62ch;
}

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

.section-head--split {
  max-width: none;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-5);
}

@media (min-width: 900px) {
  .section-head--split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
    gap: var(--space-8);
  }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  font-weight: 500;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--brand-300);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.eyebrow--accent {
  color: var(--accent-400);
}

.eyebrow--plain::before {
  display: none;
}

.section-lead {
  font-size: var(--fs-lead);
  line-height: var(--lh-relaxed);
  color: var(--text-muted);
  max-width: 60ch;
}

.text-accent {
  color: var(--accent-400);
}

.text-brand {
  color: var(--brand-300);
}

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

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* --- Grids ---------------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--space-5);
}

.grid--2 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
}

.grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr));
}

.grid--4 {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
}

.stack {
  display: grid;
  gap: var(--space-4);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

/* --- Decorative background layers ---------------------------------------- */
.bg-layer {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

/* Engineering grid paper */
.bg-grid {
  background-image: linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 35%, #000 20%, transparent 78%);
}

.bg-grid--fine {
  background-size: 24px 24px;
  opacity: 0.55;
}

/* Soft brand / accent bloom */
.bg-bloom {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
}

.bg-bloom--brand {
  background: radial-gradient(circle, rgba(27, 113, 131, 0.55), transparent 68%);
}

.bg-bloom--accent {
  background: radial-gradient(circle, rgba(242, 107, 33, 0.38), transparent 68%);
}

/* Fine film grain so large dark areas do not band */
.bg-noise {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  opacity: 0.035;
  mix-blend-mode: overlay;
}

.bg-vignette {
  background: radial-gradient(ellipse 120% 90% at 50% 0%, transparent 40%, var(--ink-950) 100%);
  opacity: 0.7;
}