/* intro v29 — Rolls-Royce thread: circle-expand reveal, half-ring, chat alignment, dual-layer parallax */

.intro-thread { min-height: 88vh; }

/* Clip-path circle expand from centre on load */
.intro-thread__reveal {
    animation: intro-thread-expand 900ms ease forwards;
}
@keyframes intro-thread-expand {
    from { clip-path: circle(0% at 50% 50%); }
    to   { clip-path: circle(150% at 50% 50%); }
}

/* Half-ring at the boundary (fixed size — no BS w-N/h-N utility) */
.intro-thread__half {
    width: 16rem;
    height: 8rem;
    opacity: 0.7;
    filter: blur(2px);
}
.intro-thread__sun { width: 6rem; height: 6rem; }
.intro-thread [data-msg] { max-width: 28rem; }

/* Dual-layer parallax offset (set by JS via custom props) */
.intro-thread__island [data-layer] {
    transition: transform 200ms ease-out;
    transform: translate(var(--px, 0), var(--py, 0));
}

/* Chat thread alternate alignment + retro corner tails */
.intro-thread [data-msg] { border-bottom-left-radius: 0.25rem; }
.intro-thread [data-msg]:nth-child(even) {
    margin-left: auto;
    border-bottom-left-radius: 1rem;
    border-bottom-right-radius: 0.25rem;
}

@media (prefers-reduced-motion: reduce) {
    .intro-thread__reveal { animation: none; }
    .intro-thread__island [data-layer] { transition: none; }
}

/* content plain — thin vertical rule height (BS has no h-16 spine utility) */
.content-plain__fine-rule {
    height: 6rem;
}

.gallery-cards__card {
    transition: transform 0.3s ease;
}
.gallery-cards__card:hover {
    transform: scale(1.05);
}
.gallery-cards__img {
    height: 16rem;
}

/* glossary folders — summary marker hide, folder hover */
.glossary-folders__sum::-webkit-details-marker {
    display: none;
}

.glossary-folders__sum {
    list-style: none;
}

.glossary-folders__folder {
    transition: transform 0.2s ease;
}

.glossary-folders__folder:hover {
    transform: translateY(-2px);
}