/* 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; }
}

/* glossary split — footnote icon size (layout only) */
.glossary-split__note-ico {
    width: 3.5rem;
    height: 3.5rem;
}

.glossary-split__note-icon {
    font-size: 1.3rem;
    line-height: 1;
}

/* FAQ v15 — CSS flip card mechanics for Bootstrap branch */
.faq-flip__card-outer {
    perspective: 1000px;
    min-height: 12rem;
}

.faq-flip__card-inner {
    transform-style: preserve-3d;
    transition: transform 0.7s ease;
}

.faq-flip__card-outer:hover .faq-flip__card-inner {
    transform: rotateY(180deg);
}

.faq-flip__face {
    backface-visibility: hidden;
}

.faq-flip__face--back {
    transform: rotateY(180deg);
}

/* gallery v18 — hero + three frames.
   Geometry shared by both CSS frameworks (Bootstrap has no grid-template / aspect utilities). */
.gallery-cascade-grid__section {
    padding-top: 6rem;
    padding-bottom: 6rem;
}

.mxw-5xl {
    max-width: 64rem !important;
}

.mxw-2xl {
    max-width: 42rem !important;
}

.gallery-cascade-grid__head {
    margin-bottom: 2.5rem;
}

.gallery-cascade-grid__title {
    font-size: 1.875rem;
    margin-bottom: 0.75rem;
}

.gallery-cascade-grid__lead {
    font-size: 1.125rem;
}

.gallery-cascade-grid__hero {
    aspect-ratio: 16 / 7;
}

.gallery-cascade-grid__thumb {
    aspect-ratio: 1 / 1;
}

.gallery-cascade-grid__img {
    object-fit: cover;
    transition: transform 300ms ease;
}

/* hover zoom — `:where()` keeps specificity at 0-1-0 so Tailwind's hover:scale-105 wins there */
:where(.gallery-cascade-grid__img):hover {
    transform: scale(1.05);
}

/* caption scrim: Bootstrap has no gradient utility, so the flat fill is toned down instead */
.gallery-cascade-grid__caption {
    --bs-bg-opacity: 0.55;
}

.gallery-cascade-grid__row {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 1.5rem;
}

@media (min-width: 640px) {
    .gallery-cascade-grid__row {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (min-width: 768px) {
    .gallery-cascade-grid__title {
        font-size: 2.25rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    :where(.gallery-cascade-grid__img):hover {
        transform: none;
    }
}