/* assets/css/layout.css
 * Page level layout: top bar, main wrappers, grid systems, the
 * ambient grid + grain background, and section spacing.
 */

main {
  position: relative;
  z-index: 10;
  min-height: 100vh;
}

.shell {
  max-width: var(--max_width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.canvas_bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(212, 162, 76, 0.06), transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(194, 91, 63, 0.04), transparent 50%);
}

.grid_overlay {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.6'/%3E%3C/svg%3E");
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px var(--gutter);
  border-bottom: 1px solid var(--rule);
  position: relative;
  z-index: 20;
  background: rgba(10, 9, 8, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.topbar_brand {
  font-family: var(--font_mono);
  font-size: var(--size_xs);
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: var(--bone_dim);
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}
.topbar_brand strong { color: var(--bone); font-weight: 500; }

.topbar_meta {
  font-family: var(--font_mono);
  font-size: var(--size_xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bone_faint);
  display: flex;
  gap: var(--space_6);
}
.topbar_meta span strong {
  color: var(--bone);
  font-weight: 500;
  margin-left: var(--space_2);
}

.section_block {
  padding: var(--space_8) 0;
  border-bottom: 1px solid var(--rule);
}

.hero_block {
  min-height: calc(100vh - 90px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space_8) 0 var(--space_9);
}

.split_two {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space_8);
  align-items: start;
}
@media (max-width: 900px) {
  .split_two { grid-template-columns: 1fr; gap: var(--space_6); }
}

.grid_auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1px;
  background: var(--rule);
}

.grid_quad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--rule);
}
@media (max-width: 900px) { .grid_quad { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .grid_quad { grid-template-columns: 1fr; } }

.cell {
  background: var(--ink);
  padding: var(--space_5);
}

.app_footer {
  border-top: 1px solid var(--rule);
  padding: var(--space_6) var(--gutter);
  font-family: var(--font_mono);
  font-size: var(--size_xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bone_faint);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space_4);
}
.app_footer a { color: var(--bone_dim); }
.app_footer a:hover { color: var(--gold); }