/* ── Not-in-objective list ── */
.not-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--sp-2);
    margin: var(--sp-3) 0;
  }
  .not-item {
    padding: var(--sp-2) var(--sp-3);
    border-radius: var(--radius-sm);
    font-size: var(--fs-sm);
    font-weight: 500;
    background: var(--red-bg);
    border: 1px solid var(--red-border);
    color: var(--red);
    position: relative;
    padding-left: 2rem;
  }
  .not-item::before {
    content: '✕';
    position: absolute;
    left: var(--sp-3);
    top: 50%;
    transform: translateY(-50%);
    font-weight: 700;
    font-size: var(--fs-xs);
  }

/* ── Data stats ── */
.data-stat { text-align: center; padding: var(--sp-3); }
  .data-stat .big-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-2xl);
    font-weight: 700;
  }
  .data-stat .stat-label {
    font-size: var(--fs-xs);
    color: var(--text-dim);
    margin-top: 0.125rem;
  }

/* ── Bar chart (for loss deep-dive slides) ── */
.bar-row {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    margin-bottom: var(--sp-2);
    height: 1.75rem;
  }
  .bar-word {
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-sm);
    width: 6.5rem;
    text-align: right;
    color: var(--text-dim);
    flex-shrink: 0;
  }
  .bar-track {
    flex: 1;
    height: 1.375rem;
    background: var(--surface2);
    border-radius: var(--radius-sm);
    overflow: hidden;
  }
  .bar-fill {
    height: 100%;
    border-radius: var(--radius-sm);
    transition: width 1s cubic-bezier(0.22, 1, 0.36, 1);
    min-width: 0;
  }
  .bar-fill.predicted { background: linear-gradient(90deg, var(--accent), var(--purple)); }
  .bar-fill.target-fill { background: linear-gradient(90deg, var(--green), #16a34a); }
  .bar-pct {
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-2xs);
    color: var(--text-dim);
    min-width: 2.5rem;
    text-align: left;
    flex-shrink: 0;
  }

/* dual chart layout */
.dual-charts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-4);
    margin-top: var(--sp-2);
  }
  @media (max-width: 50rem) {
    .dual-charts { grid-template-columns: 1fr; }
  }
  .chart-col {
    background: var(--surface2);
    border-radius: var(--radius-md);
    padding: var(--sp-3);
  }
  .chart-title {
    font-size: var(--fs-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--sp-2);
  }

/* loss display */
.loss-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-4);
    margin: var(--sp-3) 0;
    flex-wrap: wrap;
  }
  .loss-box {
    text-align: center;
    padding: var(--sp-3) var(--sp-4);
    border-radius: var(--radius-md);
    background: var(--surface2);
    border: 1px solid var(--border);
    min-width: 7rem;
  }
  .loss-box .label {
    font-size: var(--fs-2xs);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-dim);
    margin-bottom: var(--sp-1);
  }
  .loss-box .value {
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-xl);
    font-weight: 700;
  }
  .loss-box .value.high { color: var(--red); }
  .loss-box .value.low  { color: var(--green); }
  .loss-box .formula {
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-2xs);
    color: var(--text-dim);
    margin-top: var(--sp-1);
  }
  .comparison-arrow {
    font-size: var(--fs-xl);
    color: var(--text-dim);
    animation: pulseOpacity 1.5s ease-in-out infinite;
  }
  @keyframes pulseOpacity {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
  }

/* loss meter */
.loss-meter {
    width: 100%;
    height: 0.625rem;
    border-radius: var(--radius-sm);
    background: var(--surface2);
    margin: var(--sp-2) 0;
    overflow: hidden;
  }
  .loss-meter-fill {
    height: 100%;
    border-radius: var(--radius-sm);
    transition: width 1.2s cubic-bezier(0.22, 1, 0.36, 1);
  }

/* before / after */
.before-after {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: var(--sp-3);
    align-items: start;
    margin-top: var(--sp-2);
  }
  @media (max-width: 50rem) {
    .before-after { grid-template-columns: 1fr; }
  }
  .ba-col {
    background: var(--surface2);
    border-radius: var(--radius-md);
    padding: var(--sp-3);
  }
  .ba-col .ba-label {
    font-size: var(--fs-2xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    margin-bottom: var(--sp-2);
  }
  .ba-col.before .ba-label { color: var(--red); }
  .ba-col.after  .ba-label { color: var(--green); }
  .ba-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--fs-xl);
    color: var(--text-dim);
    padding-top: 2.5rem;
  }

/* backprop arrows */
.backprop-arrows {
    display: flex;
    justify-content: center;
    gap: var(--sp-1);
    margin: var(--sp-2) 0;
    font-size: var(--fs-lg);
  }
  .backprop-arrows span {
    color: var(--orange);
    animation: flowLeft 1s ease-in-out infinite;
    animation-delay: 0.45s;
  }
  .backprop-arrows span:nth-child(2) { animation-delay: 0.30s; }
  .backprop-arrows span:nth-child(3) { animation-delay: 0.15s; }
  .backprop-arrows span:nth-child(4) { animation-delay: 0.0s; }
  @keyframes flowLeft {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 1; }
  }

  /* Fixed-stage deck: keep authored multi-column layouts regardless of browser size. */
  .dual-charts {
    grid-template-columns: 1fr 1fr;
  }

  .before-after {
    grid-template-columns: 1fr auto 1fr;
  }

/* flow node (for backprop) */
.update-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-3);
    margin: var(--sp-3) 0;
    flex-wrap: wrap;
  }
  .flow-node {
    padding: var(--sp-2) var(--sp-4);
    border-radius: var(--radius-md);
    font-size: var(--fs-sm);
    font-weight: 600;
    text-align: center;
    border: 1px solid var(--border);
  }
  .flow-node.loss-node   { background: rgba(184,24,24,0.08);  border-color: rgba(184,24,24,0.45);  color: var(--red); }
  .flow-node.grad-node   { background: rgba(158,74,0,0.08);   border-color: rgba(158,74,0,0.45);   color: var(--orange); }
  .flow-node.param-node  { background: rgba(88,40,184,0.08);  border-color: rgba(88,40,184,0.45);  color: var(--purple); }
  .flow-node.better-node { background: rgba(21,116,60,0.08);  border-color: rgba(21,116,60,0.45);  color: var(--green); }

/* network box (for forward-pass slide) */
.network-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-3);
    padding: var(--sp-3) var(--sp-4);
    background: linear-gradient(135deg, rgba(26,69,200,0.07), rgba(88,40,184,0.07));
    border: 1px solid var(--accent-border);
    border-radius: var(--radius-md);
    margin: 0 auto;
    position: relative;
  }
  .network-box .nn-label { font-weight: 600; font-size: var(--fs-base); }
  .network-box .nn-sub   { font-size: var(--fs-xs); color: var(--text-dim); }
  .network-box .param-badge {
    position: absolute;
    top: -0.625rem; right: -0.625rem;
    font-size: var(--fs-2xs);
    font-weight: 600;
    background: var(--purple);
    color: #fff;
    padding: 0.2rem 0.56rem;
    border-radius: var(--radius-md);
  }
  .arrow-down {
    text-align: center;
    color: var(--text-dim);
    font-size: var(--fs-lg);
    margin: var(--sp-1) 0;
    animation: bobDown 1.2s ease-in-out infinite;
  }
  @keyframes bobDown { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(0.3rem); } }

/* context row (for loss slides) */
.context-row {
    display: flex;
    align-items: center;
    gap: var(--sp-2);
    flex-wrap: wrap;
    margin: var(--sp-3) 0 var(--sp-2);
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-base);
  }
  .ctx-tok {
    padding: 0.3rem 0.75rem;
    border-radius: 0.44rem;
    border: 1px solid var(--accent);
    background: rgba(26,69,200,0.08);
  }
  .ctx-blank {
    padding: 0.3rem 0.75rem;
    border-radius: 0.44rem;
    border: 2px dashed var(--orange);
    color: var(--orange);
    min-width: 3.75rem;
    text-align: center;
    animation: pulseBorder 1.5s ease-in-out infinite;
  }
  @keyframes pulseBorder {
    0%, 100% { border-color: var(--orange); }
    50% { border-color: rgba(158,74,0,0.3); }
  }

/* step label pill (for loss deep-dive slides) */
.step-label {
    display: inline-block;
    font-size: var(--fs-2xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--yellow);
    background: rgba(140,108,0,0.10);
    padding: 0.2rem var(--sp-2);
    border-radius: var(--radius-full);
    margin-bottom: var(--sp-2);
  }

/* Projector-safe compaction for slides 10 and 14 */
#slide-10 h2,
#slide-14 h2 {
  margin-bottom: 0.7rem;
}

#slide-10 .small-text,
#slide-14 .small-text {
  line-height: 1.42;
}

#slide-10 .spacer-sm,
#slide-14 .spacer-sm {
  height: 0.42rem;
}

#slide-10 .context-row {
  margin: 0.38rem 0 0.18rem;
  font-size: var(--fs-sm);
  gap: 0.34rem;
}

#slide-10 .ctx-tok,
#slide-10 .ctx-blank {
  padding: 0.18rem 0.5rem;
}

#slide-10 .arrow-down {
  margin: 0.12rem 0;
  font-size: 0.95rem;
}

#slide-10 .network-box {
  gap: 0.7rem;
  padding: 0.58rem 0.9rem;
}

#slide-10 .network-box .nn-label {
  font-size: var(--fs-sm);
}

#slide-10 .network-box .nn-sub {
  font-size: var(--fs-2xs);
}

#slide-10 .network-box .param-badge {
  top: -0.42rem;
  right: -0.42rem;
  font-size: 0.6rem;
  padding: 0.1rem 0.42rem;
}

#slide-10 .chart-title {
  margin-bottom: 0.34rem;
}

#slide-10 .bar-row,
#slide-14 .bar-row {
  height: 1.18rem;
  margin-bottom: 0.3rem;
  gap: 0.42rem;
}

#slide-10 .bar-word,
#slide-14 .bar-word {
  min-width: 3.15rem;
  font-size: var(--fs-2xs);
}

#slide-10 .bar-track,
#slide-14 .bar-track {
  height: 0.92rem;
}

#slide-10 .bar-pct,
#slide-14 .bar-pct {
  min-width: 2rem;
  font-size: 0.64rem;
}

#slide-10 > div:nth-of-type(1) {
  margin-top: 0.12rem;
}

#slide-10 > div:nth-of-type(1) > #predictedChart,
#slide-14 #beforeBars,
#slide-14 #afterBars {
  transform-origin: top center;
}

#slide-10 .callout,
#slide-14 .callout {
  padding: 0.56rem 0.72rem;
  gap: 0.45rem;
  font-size: var(--fs-xs);
  line-height: 1.4;
}

#slide-10 .callout .icon,
#slide-14 .callout .icon {
  font-size: var(--fs-base);
}

#slide-14 .before-after {
  gap: 0.58rem;
  margin-top: 0.24rem;
}

#slide-14 .ba-col {
  padding: 0.68rem;
}

#slide-14 .ba-col .ba-label {
  margin-bottom: 0.32rem;
}

#slide-14 .ba-arrow {
  padding-top: 1.5rem;
  font-size: 1rem;
}

#slide-14 .loss-display {
  margin: 0.55rem 0;
  gap: 0.72rem;
}

#slide-14 .loss-box {
  min-width: 6rem;
  padding: 0.6rem 0.85rem;
}

#slide-14 .loss-box .value {
  font-size: 1.2rem;
}

#slide-14 .comparison-arrow {
  font-size: 1rem;
}

#slide-12 #lossFormula {
  padding-top: 1rem;
  padding-bottom: 1rem;
  overflow: visible;
}

#slide-12 #lossFormula mjx-container[display="true"] {
  line-height: 1.2;
}