/* ═══════════════════════════════════════════════════════════════════════════
 * 3D Math for Games · tutorial-specific styles
 * Reuses the shared tokens + scaffold from tutorial.css / style.css.
 * ═══════════════════════════════════════════════════════════════════════════ */

/* ── Series banner (Part of: Build a Game Engine) ────────────────────────── */
.series-banner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  margin: 0 0 2rem;
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--tut-border);
  border-left: 3px solid var(--tut-accent);
  border-radius: 10px;
  background: var(--tut-surface);
  font-size: 0.86rem;
}
.series-banner-link { color: var(--tut-accent); text-decoration: none; font-weight: 600; }
.series-banner-link:hover { text-decoration: underline; }
.series-banner-mid { color: var(--tut-text); font-weight: 600; }
.series-banner-next { color: var(--tut-muted); margin-left: auto; }
.series-banner-next em { font-style: normal; opacity: 0.7; }

/* ── Tighter bullet lists ────────────────────────────────────────────────── */
.tight-list { margin: 0.8rem 0; padding-left: 1.2rem; display: grid; gap: 0.4rem; }
.tight-list li { line-height: 1.5; color: var(--tut-soft); }
.tight-list li strong { color: var(--tut-text); }

/* ── Widgets ─────────────────────────────────────────────────────────────── */
.tut-widget {
  margin: 1.5rem 0;
  padding: 0.9rem;
  border: 1px solid var(--tut-border);
  border-radius: 14px;
  background: linear-gradient(180deg, var(--tut-surface), var(--tut-surface-2));
}
.tut-widget canvas {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 460px;
  background: var(--tut-bg);
  border: 1px solid var(--tut-border-soft);
  border-radius: 10px;
}
.widget-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.1rem;
  margin-bottom: 0.8rem;
}
.widget-controls label {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  color: var(--tut-soft);
}
.widget-controls input[type="range"] { accent-color: var(--tut-accent); width: 8rem; max-width: 38vw; }
.widget-controls input[type="checkbox"] { accent-color: var(--tut-accent); }
.widget-controls span[data-tf-val], .widget-controls span[data-gl-val], .widget-controls span[data-sl-val] {
  font-family: var(--mono); font-size: 0.78rem; color: var(--tut-muted); min-width: 2.6rem;
}

.widget-toggle { display: inline-flex; border: 1px solid var(--tut-border); border-radius: 8px; overflow: hidden; }
.widget-toggle button {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--tut-muted);
  background: var(--tut-surface-2);
  border: none;
  border-right: 1px solid var(--tut-border);
  padding: 0.35rem 0.7rem;
  cursor: pointer;
  transition: color 0.12s ease, background 0.12s ease;
}
.widget-toggle button:last-child { border-right: none; }
.widget-toggle button:hover { color: var(--tut-text); }
.widget-toggle button.active { color: var(--tut-bg); background: var(--tut-accent); font-weight: 600; }

/* ── OpenGL vs Vulkan comparison table ───────────────────────────────────── */
.compare-table {
  margin: 1.3rem 0 0.5rem;
  border: 1px solid var(--tut-border);
  border-radius: 10px;
  overflow: hidden;
  font-size: 0.88rem;
}
.compare-row { display: grid; grid-template-columns: 1.2fr 1fr 1fr; }
.compare-row > span { padding: 0.6rem 0.8rem; border-top: 1px solid var(--tut-border-soft); }
.compare-row > span:not(:first-child) { border-left: 1px solid var(--tut-border-soft); font-family: var(--mono); font-size: 0.82rem; color: var(--tut-soft); }
.compare-row.compare-head > span { border-top: none; background: var(--tut-surface-2); color: var(--tut-text); font-weight: 600; font-family: inherit; }
.compare-row [role="rowheader"] { color: var(--tut-muted); }

/* ── Pitfall grid ────────────────────────────────────────────────────────── */
.pitfall-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.7rem;
  margin: 1.2rem 0;
}
.pitfall {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem 0.9rem;
  border-left: 3px solid var(--tut-danger);
  border-radius: 0 8px 8px 0;
  background: var(--tut-surface);
}
.pitfall strong { color: var(--tut-text); font-size: 0.9rem; }
.pitfall span { color: var(--tut-muted); font-size: 0.82rem; line-height: 1.45; }

/* ── Quiz note + callout variants ────────────────────────────────────────── */
.quiz-note { font-size: 0.82rem; color: var(--tut-muted); font-style: italic; margin-top: 0.5rem; }

.callout.is-warn { border-left: 3px solid var(--tut-warn); }
.callout.is-warn .callout-title { color: var(--tut-warn); }
.callout.is-info { border-left: 3px solid var(--tut-info); }
.callout.is-info .callout-title { color: var(--tut-info); }

@media (max-width: 560px) {
  .series-banner-next { margin-left: 0; }
  .tut-widget canvas { aspect-ratio: 4 / 3; max-height: none; }
  .compare-row { grid-template-columns: 1fr; }
  .compare-row > span:not(:first-child) { border-left: none; }
  .pitfall-grid { grid-template-columns: 1fr; }
}