/* ── Math formulas ── */
.math {
    font-family: 'JetBrains Mono', monospace;
    font-size: var(--fs-lg);
    text-align: center;
    padding: var(--sp-3);
    background: var(--surface2);
    border-radius: var(--radius-md);
    margin: var(--sp-3) 0;
    color: var(--yellow);
    letter-spacing: 0.02em;
    line-height: 1.6;
  }
  .math-big { font-size: var(--fs-xl); padding: var(--sp-4); }
  .math mjx-container {
    margin: 0 auto !important;
    color: inherit;
  }
  .math mjx-container[display="true"] {
    margin: 0 auto !important;
  }

/* ── Animated gradient line ── */
.gradient-line {
    height: 0.15rem;
    background: linear-gradient(90deg, var(--accent), var(--purple), var(--pink), var(--accent));
    background-size: 200% 100%;
    animation: shimmer 2.5s linear infinite;
    border-radius: 0.125rem;
    margin: var(--sp-2) 0;
  }
  @keyframes shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
  }

/* ── Pipeline boxes ── */
.pipeline-box {
    padding: var(--sp-4);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--surface);
    position: relative;
  }
  .pipeline-box h3 { font-size: var(--fs-base); margin-bottom: var(--sp-2); }
  .pipeline-box .small-text { font-size: var(--fs-sm); }
  .pipeline-box .pipe-num {
    position: absolute;
    top: -0.625rem; left: -0.625rem;
    width: 1.625rem; height: 1.625rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--fs-xs);
    font-weight: 700;
    color: #fff;
  }

/* ── Slide 3: ingredient images ── */
#slide-3 {
    isolation: isolate;
  }

#slide-3 .ingredient-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: 0;
    row-gap: 0;
    align-items: stretch;
    flex: 1 1 auto;
    min-height: 0;
    position: relative;
    z-index: 1;
  }

#slide-3 .ingredient-stack {
    display: flex;
    flex-direction: column;
    gap: 0;
    min-width: 0;
    min-height: 0;
    position: relative;
  }

#slide-3 .ingredient-card {
    min-height: 7rem;
    padding: 1.3rem 0.72rem 0.62rem;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    border-radius: 0;
    border-right-width: 0;
    border-bottom-width: 0;
    transition: background 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
  }

#slide-3 .ingredient-stack:first-child .ingredient-card {
    border-top-left-radius: var(--radius-md);
    border-bottom-left-radius: var(--radius-md);
  }

#slide-3 .ingredient-stack:last-child .ingredient-card {
    border-top-right-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
    border-right-width: 1px;
  }

#slide-3 .ingredient-card-label {
    position: absolute;
    top: 0.55rem;
    left: 0.6rem;
    min-width: 1.3rem;
    height: 1.3rem;
    padding: 0 0.32rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    border: 1px solid var(--ingredient-accent-border);
    background: var(--ingredient-accent-bg);
    color: var(--ingredient-accent);
    font-size: var(--fs-2xs);
    font-weight: 600;
    line-height: 1;
  }

#slide-3 .ingredient-card-body,
#slide-3 .ingredient-state {
    width: 100%;
  }

#slide-3 .ingredient-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
  }

#slide-3 .ingredient-title {
    margin-bottom: 0;
    color: var(--ingredient-accent);
  }

#slide-3 .ingredient-stack[data-phase="text"] .ingredient-card,
#slide-3 .ingredient-stack[data-phase="hero"] .ingredient-card,
#slide-3 .ingredient-stack[data-phase="grid"] .ingredient-card {
    background: linear-gradient(180deg, rgba(255,255,255,0.9), var(--ingredient-accent-bg));
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.35);
  }

#slide-3 .ingredient-state .small-text {
    font-size: 0.78rem;
    line-height: 1.24;
  }

#slide-3 .ingredient-prompt {
    color: var(--text-dim);
  }

#slide-3 .ingredient-reveal-btn {
    margin-top: 0.35rem;
  }

#slide-3 .ingredient-reveal-btn:disabled {
    opacity: 0.42;
    cursor: not-allowed;
  }

#slide-3 .ingredient-image-wrap {
    margin: 0;
    padding: 0.12rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1 1 auto;
    min-height: 0;
    border: 1px solid rgba(90,100,144,0.18);
    border-radius: 0;
    background: linear-gradient(180deg, rgba(242,244,252,0.95), rgba(228,232,245,0.55));
    overflow: hidden;
    transition: background 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
  }

#slide-3 .ingredient-stack:first-child .ingredient-image-wrap {
    border-bottom-left-radius: var(--radius-md);
  }

#slide-3 .ingredient-stack:last-child .ingredient-image-wrap {
    border-bottom-right-radius: var(--radius-md);
  }

#slide-3 .ingredient-stack:not(:last-child) .ingredient-image-wrap {
    border-right-width: 0;
  }

#slide-3 .ingredient-image-wrap.is-target {
    border-color: var(--ingredient-accent-border);
    background: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(255,255,255,0.68), var(--ingredient-accent-bg));
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.44);
  }

#slide-3 .ingredient-image-wrap.is-visible {
    border-color: var(--ingredient-accent-border);
    background: linear-gradient(180deg, rgba(255,255,255,0.95), var(--ingredient-accent-bg));
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.44);
  }

#slide-3 .ingredient-image {
    display: block;
    width: 100%;
    height: 100%;
    margin: 0 auto;
    background: transparent;
    object-fit: contain;
    object-position: center;
    opacity: 0;
    transform: scale(1.03);
    transition: opacity 0.25s ease, transform 0.25s ease, filter 0.25s ease;
  }

#slide-3 .ingredient-image-wrap.is-visible .ingredient-image {
    opacity: 1;
    transform: scale(1.08);
    filter: drop-shadow(0 0.45rem 0.8rem rgba(12,14,28,0.12));
  }

#slide-3 .ingredient-hero-stage {
    position: absolute;
    left: 50%;
    top: 12.35rem;
    width: min(38rem, calc(100% - 12rem));
    height: 16.6rem;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transform: translateX(-50%) scale(0.96);
    transition: opacity 0.32s ease, transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
    z-index: 4;
  }

#slide-3 .ingredient-hero-stage.is-visible {
    opacity: 1;
    transform: translateX(-50%) scale(1);
  }

#slide-3 .ingredient-hero-frame {
    width: 100%;
    height: 100%;
    padding: 0.85rem;
    border-radius: 1rem;
    border: 1px solid var(--ingredient-accent-border, rgba(90,100,144,0.26));
    background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(255,255,255,0.76), var(--ingredient-accent-bg, rgba(242,244,252,0.92)));
    box-shadow: 0 1.1rem 2.4rem rgba(12,14,28,0.12);
  }

#slide-3 .ingredient-hero-image {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    filter: drop-shadow(0 0.9rem 1.2rem rgba(12,14,28,0.16));
  }

#slide-3 > h2 {
    margin-bottom: 0.1rem;
  }

#slide-3 > .small-text {
    line-height: 1.24;
  }

#slide-3 > .spacer-sm {
    height: 0.22rem;
  }

.ingredient-flight-ghost {
    position: fixed;
    left: 0;
    top: 0;
    padding: 0;
    border-radius: 0.4rem;
    border: 0;
    background: transparent;
    box-shadow: none;
    pointer-events: none;
    z-index: 2000;
    overflow: hidden;
    transform-origin: center center;
    will-change: transform, opacity;
  }

.ingredient-flight-ghost img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    filter: drop-shadow(0 0.9rem 1.2rem rgba(12,14,28,0.16));
    transform-origin: center center;
    will-change: transform, opacity;
  }