/* Slides 28 + 31: GPT block walkthrough and stack. */

/* ── Shared takeaway strip ── */
.block28-takeaway {
  margin-top: var(--sp-3);
  padding: 0.62rem 0.78rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--accent-border);
  background: var(--accent-bg);
  color: #0d1020;
  font-size: var(--fs-xs);
  line-height: 1.45;
}

/* ── Slide 28: GPT block walkthrough ── */

.block28-layout {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.9rem;
  align-items: start;
  margin-top: 0.68rem;
  min-height: 0;
}

.block28-diagram {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.4rem;
}

.block28-detail-panel {
  margin-left: 0;
  transform: none;
  align-self: center;
  min-width: 0;
}

.block28-arch .arch-box,
.block28-arch .arch-plus {
  transition: border-color 0.25s ease, box-shadow 0.25s ease, opacity 0.25s ease;
  opacity: 1;
}

.block28-arch .arch-box.drop,
.block28-arch .arch-box.norm {
  min-width: 6.5rem !important;
}

.block28-io-label {
  font-size: var(--fs-xs);
  color: var(--text-dim);
}

/* annotation panel */
.block28-panel {
  display: grid;
  gap: 0.48rem;
  align-content: start;
}

.block28-orient-card,
.block28-note {
  padding: 0.33rem 0.84rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
}

.block28-orient-card {
  border-color: rgba(42, 79, 214, 0.55);
  background: rgba(42, 79, 214, 0.08);
}

.block28-note {
  opacity: 0;
  transform: translateX(0.4rem);
  transition: opacity 0.28s ease, transform 0.28s ease;
}

.block28-note-head {
  font-size: var(--fs-2xs);
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 0.18rem;
}

.block28-note-body {
  font-size: var(--fs-xs);
  color: var(--text-dim);
  line-height: 1.42;
}

.block28-equations {
  display: grid;
  gap: 0.36rem;
  margin-top: 0.36rem;
}

.block28-equation {
  padding: 0.34rem 0.58rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent-border);
  background: var(--accent-bg);
  color: #0d1020;
  font-size: var(--fs-2xs);
  text-align: center;
}

#slide-28 .slide-body > .hidden-content {
  flex: 0 0 auto;
}

#slide-28 .callout {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  margin-top: 0.48rem !important;
  gap: 0.5rem;
  padding: 0.56rem 0.72rem;
  font-size: var(--fs-xs);
  line-height: 1.38;
  align-items: start;
}

#slide-28 .callout span:last-child {
  min-width: 0;
  width: auto;
}

#slide-28 .block28-takeaway {
  margin-top: 0.48rem;
  padding: 0.48rem 0.64rem;
  font-size: var(--fs-2xs);
  line-height: 1.34;
}

/* step-driven visibility */
#slide-28.block28-show-ln .block28-ln-attn,
#slide-28.block28-show-ln .block28-ln-ffn,
#slide-28.block28-show-attn .block28-attn-box,
#slide-28.block28-show-add .block28-plus-attn,
#slide-28.block28-show-ffn .block28-ffn-box,
#slide-28.block28-show-eq .block28-plus-ffn {
  opacity: 1;
  border-color: inherit;
}

/* color-coded highlights per step */
#slide-28.block28-show-ln .block28-ln-attn,
#slide-28.block28-show-ln .block28-ln-ffn {
  border-color: var(--cyan-border) !important;
  box-shadow: 0 0 0 0.06rem var(--cyan-bg);
}

#slide-28.block28-show-attn .block28-attn-box {
  border-color: rgba(90,48,200,0.55) !important;
  box-shadow: 0 0 0 0.06rem var(--purple-bg);
}

#slide-28.block28-show-add .block28-plus-attn {
  border-color: var(--accent-border) !important;
  box-shadow: 0 0 0 0.06rem var(--accent-bg);
}

#slide-28.block28-show-ffn .block28-ffn-box {
  border-color: var(--cyan-border) !important;
  box-shadow: 0 0 0 0.06rem var(--cyan-bg);
}

#slide-28.block28-show-eq .block28-plus-ffn {
  border-color: var(--accent-border) !important;
  box-shadow: 0 0 0 0.06rem var(--accent-bg);
}

/* note reveals keyed to steps */
#slide-28.block28-show-ln .block28-note-ln,
#slide-28.block28-show-attn .block28-note-attn,
#slide-28.block28-show-add .block28-note-add,
#slide-28.block28-show-ffn .block28-note-ffn,
#slide-28.block28-show-eq .block28-note-eq {
  opacity: 1;
  transform: translateX(0);
}

/* color accents on note heads */
.block28-note-ln .block28-note-head { color: var(--cyan); }
.block28-note-attn .block28-note-head { color: var(--purple); }
.block28-note-add .block28-note-head { color: var(--accent); }
.block28-note-ffn .block28-note-head { color: var(--cyan); }
.block28-note-eq .block28-note-head { color: var(--text); }

/* ── Slide 31: block stack ── */

.stack31-layout {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.96rem;
  align-items: start;
  margin-top: 0.68rem;
  min-height: 0;
}

.slide-has-takeaway .block28-layout,
.slide-has-takeaway .stack31-layout {
  margin-top: 0.3rem;
}

.stack31-chain {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

#slide-31 .arch-brace-label {
  transform: translateY(-50%) translateX(calc(100% - 0.8rem));
}

.stack31-io-label {
  text-align: center;
}

.stack31-notes {
  display: grid;
  gap: 0.54rem;
  align-content: start;
  padding-top: 0.14rem;
}

.stack31-overview-card {
  padding: 0.68rem 0.84rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(42, 79, 214, 0.55);
  background: rgba(42, 79, 214, 0.08);
}

.stack31-overview-head {
  font-size: var(--fs-2xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #0d1020;
  margin-bottom: 0.18rem;
}

.stack31-overview-body {
  font-size: var(--fs-xs);
  color: var(--text-dim);
  line-height: 1.42;
}

.stack31-note-strip {
  padding: 0.68rem 0.84rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
  display: grid;
  gap: 0.46rem;
}

.stack31-note-row {
  font-size: var(--fs-xs);
  color: var(--text-dim);
  line-height: 1.42;
}

#slide-31 .callout {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.5rem;
  padding: 0.56rem 0.72rem;
  font-size: var(--fs-xs);
  line-height: 1.38;
  align-items: start;
}

#slide-31 .callout span:last-child {
  min-width: 0;
}

#slide-31 .block28-takeaway {
  margin-top: 0.48rem;
  padding: 0.48rem 0.64rem;
  font-size: var(--fs-2xs);
  line-height: 1.34;
}