/* ============================================================
   LUMIRIC STUDIO — tutorials.css
   Wiki-style layout for the tutorials section (sidebar + content).
   Loaded only on /stage/tutorials pages.
   ============================================================ */

.tut-shell { padding: 96px 0 80px; }

.tut-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  align-items: start;
}

/* ── Sidebar ─────────────────────────────────────────────── */
.tut-sidebar {
  position: sticky;
  top: 96px;
  align-self: start;
  font-size: 14px;
}
.tut-sidebar__cat { margin-bottom: 22px; }
.tut-sidebar__cat-name {
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--text-muted, #8a8a93);
  margin: 0 0 10px;
}
.tut-sidebar__list { list-style: none; margin: 0; padding: 0; }
.tut-sidebar__list li { margin: 0 0 2px; }
.tut-sidebar__link {
  display: block;
  padding: 7px 12px;
  border-radius: 8px;
  color: var(--text, #e8e8ea);
  text-decoration: none;
  line-height: 1.35;
  border-left: 2px solid transparent;
  transition: background .15s, border-color .15s, color .15s;
}
.tut-sidebar__link:hover { background: rgba(255,255,255,.05); }
.tut-sidebar__link--active {
  background: rgba(240,138,32,.1);
  border-left-color: #F08A20;
  color: #F08A20;
  font-weight: 600;
}
.tut-sidebar__star { color: #F08A20; }

/* ── Content ─────────────────────────────────────────────── */
.tut-content { min-width: 0; max-width: 760px; }
.tut-breadcrumb {
  font-size: 13px;
  color: var(--text-muted, #8a8a93);
  margin-bottom: 18px;
}
.tut-breadcrumb a { color: inherit; text-decoration: none; }
.tut-breadcrumb a:hover { color: #F08A20; }
.tut-content h1 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 14px; line-height: 1.12; }
.tut-content__intro { font-size: 18px; color: var(--text-soft, #b8b8bf); margin: 0 0 32px; }

.tut-video {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: 14px;
  overflow: hidden;
  margin: 0 0 36px;
  background: #000;
}
.tut-video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* ── Steps ───────────────────────────────────────────────── */
.tut-steps { display: flex; flex-direction: column; gap: 28px; }
.tut-step {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 16px;
  align-items: start;
}
.tut-step__num {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: rgba(240,138,32,.14);
  color: #F08A20;
  font-weight: 700;
}
.tut-step__title { font-size: 19px; margin: 4px 0 8px; }
.tut-step__desc { color: var(--text-soft, #b8b8bf); margin: 0 0 14px; line-height: 1.6; }
.tut-step__img { width: 100%; border-radius: 10px; display: block; border: 1px solid rgba(255,255,255,.08); }

.tut-empty {
  padding: 28px;
  border: 1px dashed rgba(255,255,255,.15);
  border-radius: 12px;
  color: var(--text-muted, #8a8a93);
  text-align: center;
}

/* ── Index grid ──────────────────────────────────────────── */
.tut-index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px;
  margin-top: 28px;
}
.tut-card {
  display: block;
  padding: 20px;
  border-radius: 12px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.07);
  text-decoration: none;
  color: inherit;
  transition: border-color .15s, transform .15s;
}
.tut-card:hover { border-color: #F08A20; transform: translateY(-2px); }
.tut-card__cat {
  font-size: 11px; letter-spacing: .06em; text-transform: uppercase;
  color: #F08A20; font-weight: 700;
}
.tut-card__title { font-size: 17px; margin: 8px 0 6px; line-height: 1.3; }
.tut-card__intro { font-size: 14px; color: var(--text-muted, #8a8a93); margin: 0; line-height: 1.5; }

.tut-back {
  display: inline-block;
  margin-top: 40px;
  color: var(--text-muted, #8a8a93);
  text-decoration: none;
  font-size: 14px;
}
.tut-back:hover { color: #F08A20; }

@media (max-width: 860px) {
  .tut-layout { grid-template-columns: 1fr; gap: 28px; }
  .tut-sidebar { position: static; }
}