/* Primer 04 — page-specific components. */

/* ── §2 G-Buffer channel viewer ─────────────────────────────────────────── */
.gbuf__tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 18px; }
.gbuf__tab {
  cursor: pointer; font-family: var(--font-heading); font-weight: 600; font-size: 13px;
  border-radius: var(--radius-md); padding: 8px 15px;
  border: 1px solid var(--color-neutral-400); background: transparent; color: var(--color-neutral-800);
}
.gbuf__tab:hover { border-color: var(--color-accent); color: var(--color-accent-700); }
.gbuf__tab[aria-selected="true"] { background: var(--color-accent); border-color: var(--color-accent); color: #fff; }

.gbuf__cols { display: grid; grid-template-columns: 380px 1fr; gap: 24px; align-items: center; }
.gbuf__stage { text-align: center; }
.gbuf__stage canvas {
  width: 380px; height: 250px; max-width: 100%;
  border-radius: var(--radius-sm); border: 1px solid var(--color-neutral-300); background: #0e1524;
}
.gbuf__tag { font-size: 11px; color: var(--color-neutral-500); margin-top: 8px; }
.gbuf__en { font-family: var(--font-heading); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--color-accent-700); }
.gbuf__title { font-size: 23px; margin: 6px 0 10px; }
.gbuf__desc { font-size: 15px; line-height: 1.7; text-align: justify; margin: 0; color: var(--color-neutral-800); }
.gbuf__note {
  border-left: 3px solid var(--color-accent-400); padding: 2px 0 2px 14px; margin-top: 16px;
  font-size: 13px; line-height: 1.6; color: var(--color-neutral-700);
}

/* ── §3 numbered pass steps ─────────────────────────────────────────────── */
.passes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 26px 0 0; }
.pass {
  border: 1px solid var(--color-divider); border-radius: var(--radius-md);
  padding: 18px 16px; background: var(--color-neutral-100);
}
.pass__no { font-family: var(--font-heading); font-size: 26px; color: var(--color-accent-700); }
.pass__name { font-family: var(--font-heading); font-size: 16px; margin: 2px 0 6px; }
.pass__body { font-size: 13px; line-height: 1.6; color: var(--color-neutral-700); }

.cardgrid--3 .tcard__title { font-size: 18px; }

.fig--tall { min-height: 132px; gap: 12px; }
.fig--tall .fig__box { padding: 9px 13px; font-size: 13px; }
.fig__tile {
  width: 52px; height: 38px; border-radius: 4px; border: 1px solid var(--color-neutral-400);
  display: flex; align-items: flex-end; justify-content: center;
}
.fig__tile span { font-family: var(--font-mono); font-size: 8px; color: #fff; padding-bottom: 2px; }

@media (max-width: 680px) {
  .gbuf__cols, .passes, .cardgrid--3 { grid-template-columns: 1fr; }
  .gbuf__stage canvas { height: auto; }
}