/* intro v28 — Arc diagonal-split: clip split, floating rings, ransom-note words, grayscale hover, click burst */

/* Diagonal split zone */
.intro-arc2__split {
    clip-path: polygon(0 0, 100% 0, 100% 62%, 0 100%);
    opacity: 0.6;
}

/* Floating rings / donuts (fixed size — no BS w-N/h-N utility) */
.intro-arc2__ring { width: 10rem; height: 10rem; animation: intro-arc2-float 7s ease-in-out infinite; }
.intro-arc2__ring--2 { width: 6rem; height: 6rem; animation-duration: 9s; animation-delay: 1s; }
@keyframes intro-arc2-float {
    50% { transform: translateY(-1.2rem) rotate(20deg); }
}

/* Serif accent (paired with sans body) */
.intro-arc2__serif { font-family: ui-serif, Georgia, "Times New Roman", serif; }

/* Hero image grayscale → colour reveal on hover */
.intro-arc2__figure { aspect-ratio: 4 / 3; }
.intro-arc2__img {
    object-fit: cover;
    filter: grayscale(1);
    transition: filter 420ms ease;
}
.intro-arc2__figure:hover .intro-arc2__img { filter: grayscale(0); }

/* Ransom-note mixed letters: alternate rotation, weight, family (no colour) */
.intro-arc2__word {
    display: inline-block;
    margin-right: 0.25em;
}
.intro-arc2__word:nth-child(3n+1) { transform: rotate(-4deg); font-weight: 900; }
.intro-arc2__word:nth-child(3n+2) { transform: rotate(3deg);  font-family: ui-serif, Georgia, serif; font-style: italic; }
.intro-arc2__word:nth-child(3n+3) { transform: rotate(-1deg); font-weight: 700; text-transform: uppercase; }

/* Click burst spark (inherits the button's primary colour via currentColor) */
.intro-arc2__react { position: relative; overflow: visible; }
.intro-arc2__spark {
    position: absolute;
    left: 50%;
    top: 50%;
    pointer-events: none;
    animation: intro-arc2-burst 640ms ease-out forwards;
}
@keyframes intro-arc2-burst {
    to { opacity: 0; transform: translate(var(--dx), var(--dy)) scale(0.4) rotate(160deg); }
}

@media (prefers-reduced-motion: reduce) {
    .intro-arc2__ring { animation: none; }
}

/* 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);
}

.content-col-grow {
    flex: 1 1 0%;
    min-width: 0;
}

.content-grid-gap {
    gap: 2rem;
}

.content-full-frame {
    max-width: 80rem;
    margin-left: auto;
    margin-right: auto;
    width: 100%;
}

.content-heading-gap {
    margin-bottom: 2rem;
}

.content-section-pad {
    padding-top: 6rem;
    padding-bottom: 6rem;
}

.content-base-height {
    display: block;
    width: 100%;
    height: 16rem;
    min-height: 16rem;
    flex-shrink: 0;
    object-fit: cover;
}


.boost-rally__section {
    padding-top: 6rem;
    padding-bottom: 6rem;
}

.boost-rally__inner {
    max-width: 64rem;
}

@keyframes boost-rally-highlight-throb-loop {
    0%, 100% { opacity: 1; }
    50%       { opacity: .5; }
}
.boost-rally__highlight--throb {
    animation: boost-rally-highlight-throb-loop 2s cubic-bezier(.4,0,.6,1) infinite;
}

.boost-rally__appeal--shift:hover { transform: scale(1.05); transition: transform .2s ease; }

.boost-rally__panel--shift:hover { transform: scale(1.05); transition: transform .2s ease; }

/* Всегда на контейнере двух карточек: явный gap для grid (Tailwind) и дублирует зазор для flex (BS) */
.boost-rally__card-stack-gap {
    gap: 2rem;
}

/* Bootstrap only: класс задаётся в bs:, в Tailwind-режиме не выводится — не конфликтует с grid */
.boost-rally__card-row-bs {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    width: 100%;
    align-items: stretch;
}

@media (min-width: 768px) {
    .boost-rally__card-row-bs {
        flex-direction: row;
    }

    .boost-rally__card-row-bs > .boost-rally__panel--shift {
        flex: 1 1 0;
        min-width: 0;
    }
}

.boost-rally__card-row-bs > .boost-rally__panel--shift {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.boost-rally__card-row-bs > .boost-rally__panel--shift > a:last-of-type {
    margin-top: auto;
}