/* 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; }
}

/* v24 - ascending staircase offsets (per-index transform has no TW/BS utility) */
.climb-tier__badge {
    width: 2.75rem;
    height: 2.75rem;
}

@media (min-width: 640px) {
    [data-stair-step] {
        transition: transform 200ms ease;
    }

    [data-stair-step="0"] {
        transform: translateX(0);
    }

    [data-stair-step="1"] {
        transform: translateX(1.5rem);
    }

    [data-stair-step="2"] {
        transform: translateX(3rem);
    }

    [data-stair-step="3"] {
        transform: translateX(4.5rem);
    }

    [data-stair-step="4"] {
        transform: translateX(6rem);
    }
}

/* process natgeo — accent line, large icon cells (no colors) */
.process-natgeo__accent-line {
    width: 2.5rem;
    flex-shrink: 0;
}
.process-natgeo__icon-cell {
    aspect-ratio: 1 / 1;
    width: 8rem;
    height: 8rem;
    margin-inline: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.process-natgeo__icons {
    min-width: 0;
}
.process-natgeo__icons > * {
    min-width: 0;
}
.process-natgeo__icon {
    font-size: 3rem !important;
    line-height: 0 !important;
    width: auto;
    height: auto;
    display: inline-block;
}
@media (min-width: 768px) {
    .process-natgeo__icon {
        font-size: 3.75rem !important;
    }
}

/* quote v13 — sekiro swimlane index cards: tessellation, CRT flicker, smoke wisps */

/* geometric tessellation tile sizing */
.sekiro-swimlane__tessellation svg {
    width: 100%;
    height: 100%;
}

/* CRT scanline flicker loop — tint via currentColor on the element */
.sekiro-swimlane__scanlines {
    background-image: repeating-linear-gradient(
        to bottom,
        currentColor 0,
        currentColor 1px,
        transparent 1px,
        transparent 3px
    );
    background-size: 100% 3px;
    animation: sekiro-swimlane-scanline-flicker 2.4s steps(2, end) infinite;
}

@keyframes sekiro-swimlane-scanline-flicker {
    0%, 100% {
        opacity: .12;
    }
    50% {
        opacity: .28;
    }
}

/* smoke / mist wisps — layout + blur only */
.sekiro-swimlane__wisp {
    filter: blur(48px);
    animation: sekiro-swimlane-wisp-drift 14s ease-in-out infinite;
}

.sekiro-swimlane__wisp--a {
    top: 8%;
    left: -4%;
    width: 16rem;
    height: 10rem;
    animation-delay: 0s;
}

.sekiro-swimlane__wisp--b {
    top: 42%;
    right: -6%;
    width: 20rem;
    height: 12rem;
    animation-delay: 4.5s;
}

.sekiro-swimlane__wisp--c {
    bottom: 6%;
    left: 28%;
    width: 14rem;
    height: 9rem;
    animation-delay: 9s;
}

@keyframes sekiro-swimlane-wisp-drift {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: .35;
    }
    50% {
        transform: translate(1.5rem, -0.75rem) scale(1.08);
        opacity: .65;
    }
}

/* typography axis: lowercase body copy */
.sekiro-swimlane__body {
    text-transform: lowercase;
}

/* pull-quote aside accent rail */
.sekiro-swimlane__pull-rail {
    width: 3px;
    min-height: 3rem;
}

/* lane focus toggle — JS-driven active state (TW + BS parity via theme tokens) */
.sekiro-swimlane__tab {
    appearance: none;
    -webkit-appearance: none;
    font: inherit;
    cursor: pointer;
    outline-offset: -2px;
    transition: border-color 180ms ease, color 180ms ease;
    background-color: transparent;
    border-style: solid;
}

.sekiro-swimlane__tab.is-active {
    border-color: var(--bs-primary);
    color: var(--bs-primary);
}

/* swimlane panel — flex/grid child must shrink below content width for overflow-x scroll */
.sekiro-swimlane__panel {
    min-width: 0;
}

/* swimlane row focus / dim states */
.sekiro-swimlane__lane {
    max-width: 100%;
    transition: opacity 220ms ease, transform 220ms ease;
}

.sekiro-swimlane__lane.is-dimmed {
    opacity: .42;
}

.sekiro-swimlane__lane.is-focused {
    opacity: 1;
    transform: translateY(-0.125rem);
}

/* index-card micro tile */
.sekiro-swimlane__index-card {
    width: 11.5rem;
    min-height: 9.5rem;
    flex-shrink: 0;
    scroll-snap-align: start;
    transition: transform 200ms ease, box-shadow 200ms ease;
}

.sekiro-swimlane__index-card:hover {
    transform: translateY(-0.25rem);
}

/* ruled index-card lines — currentColor only */
.sekiro-swimlane__index-card__rules {
    top: 2rem;
    background-image: repeating-linear-gradient(
        to bottom,
        transparent 0,
        transparent 0.85rem,
        currentColor 0.85rem,
        currentColor calc(0.85rem + 1px)
    );
    background-size: 100% 1.125rem;
    opacity: .08;
}

/* hole-punch marker */
.sekiro-swimlane__index-card__punch {
    width: 0.5rem;
    height: 0.5rem;
}

/* horizontal swimlane scroll snap */
.sekiro-swimlane__track {
    width: 100%;
    max-width: 100%;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
}

/* pull-quote clamp for aside width */
.sekiro-swimlane__pull-text {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 5;
    overflow: hidden;
}

/* card quote clamp */
.sekiro-swimlane__card-clamp {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 4;
    overflow: hidden;
}

@media (prefers-reduced-motion: reduce) {
    .sekiro-swimlane__scanlines,
    .sekiro-swimlane__wisp {
        animation: none;
    }

    .sekiro-swimlane__lane,
    .sekiro-swimlane__index-card {
        transition: none;
    }
}
/* hover + focus affordances (layout/outline via theme token) */
@media (hover: hover) {
    .sekiro-swimlane-root [role="listitem"]:hover,
    .sekiro-swimlane-root article:hover,
    .sekiro-swimlane-root [class*="sekiro-swimlane__card"]:hover,
    .sekiro-swimlane-root .sekiro-swimlane__book:hover,
    .sekiro-swimlane-root .sekiro-swimlane__step:hover,
    .sekiro-swimlane-root .sekiro-swimlane__index-card:hover,
    .sekiro-swimlane-root .sekiro-swimlane__pill:hover,
    .sekiro-swimlane-root .sekiro-swimlane__item:hover {
        transform: translateY(-0.125rem);
    }
}

.sekiro-swimlane-root [role="listitem"],
.sekiro-swimlane-root article,
.sekiro-swimlane-root [class*="sekiro-swimlane__card"],
.sekiro-swimlane-root .sekiro-swimlane__book,
.sekiro-swimlane-root .sekiro-swimlane__step,
.sekiro-swimlane-root .sekiro-swimlane__index-card,
.sekiro-swimlane-root .sekiro-swimlane__pill {
    transition: transform 200ms ease;
}

.sekiro-swimlane-root a:focus-visible,
.sekiro-swimlane-root button:focus-visible,
.sekiro-swimlane-root [tabindex="0"]:focus-visible,
.sekiro-swimlane-root input:focus-visible,
.sekiro-swimlane-root summary:focus-visible,
.sekiro-swimlane-root [role="slider"]:focus-visible {
    outline: 2px solid var(--bs-primary);
    outline-offset: 2px;
}

@media (hover: hover) {
    .sekiro-swimlane-root button:hover,
    .sekiro-swimlane-root a:hover,
    .sekiro-swimlane-root summary:hover {
        opacity: 0.92;
    }
}