/* intro v16 — Metropolis reel: film-perforation strips, image cover, load stagger, radius morph */

/* Film-perforation edge strips: colour comes from Tailwind bg-* on the element; mask punches holes */
.intro-reel__perf {
    -webkit-mask: radial-gradient(circle at center, transparent 0 0.28rem, black 0.3rem) center / 1.5rem 2.2rem;
    mask: radial-gradient(circle at center, transparent 0 0.28rem, black 0.3rem) center / 1.5rem 2.2rem;
    z-index: 1;
}

/* Background image fills the band, keeps aspect via object-fit (no BS utility) */
.intro-reel__row {
    min-height: 18rem;
    transition: border-radius 320ms ease;
    opacity: 0;
    animation: intro-reel-rise 520ms ease forwards;
}
.intro-reel__img {
    object-fit: cover;
    object-position: center;
}

/* Border-radius morph on hover */
.intro-reel__row:hover {
    border-radius: 2.25rem 0.5rem 2.25rem 0.5rem;
}

/* Stagger children — 80ms delay each on load */
.intro-reel__row:nth-child(1) { animation-delay: 0ms; }
.intro-reel__row:nth-child(2) { animation-delay: 80ms; }
.intro-reel__row:nth-child(3) { animation-delay: 160ms; }
.intro-reel__row:nth-child(4) { animation-delay: 240ms; }
.intro-reel__row:nth-child(5) { animation-delay: 320ms; }
.intro-reel__row:nth-child(6) { animation-delay: 400ms; }

@keyframes intro-reel-rise {
    from { opacity: 0; transform: translateY(1.5rem); }
    to   { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
    .intro-reel__row { animation: none; opacity: 1; }
}

/* Bootstrap flex-md-row: cap thumb width (parity with Tailwind md:w-80) */
.content-v41-thumb-wrap {
    flex-shrink: 0;
}

@media (min-width: 768px) {
    .content-v41-thumb-wrap {
        width: 20rem;
        max-width: 20rem;
    }
}

.spread-chapter__visual--rise:hover { transform: scale(1.05); transition: transform .2s ease; }

.spread-chapter__jump--rise:hover { transform: scale(1.05); transition: transform .2s ease; }

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

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

.content-img-expands {
    display: block;
    width: 100%;
    height: 18rem;
    min-height: 18rem;
    flex-shrink: 0;
    object-fit: cover;
}
@media (min-width: 768px) {
    .content-img-expands {
        height: 24rem;
        min-height: 24rem;
    }
}

/* steps v23 - scroll progress fill driven by a JS-set --progress custom property */

.ascent-rail__wrap {
    max-width: 48rem;
    margin-left: auto;
    margin-right: auto;
}

.steps-scroll-timeline__track {
    position: relative;
    padding-left: 4rem;
}

.steps-scroll-timeline__line {
    position: absolute;
    left: 1.5rem;
    top: 0;
    bottom: 0;
    width: 2px;
}

.steps-scroll-timeline__fill {
    --progress: 0%;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--progress);
    transition: height 120ms linear;
}

.steps-scroll-timeline__dot {
    position: absolute;
    left: -4rem;
    top: 0;
    width: 3rem;
    height: 3rem;
}

/* FAQ v6 — JS hooks */
.guides-solver-content-tucked {
    display: none;
}

.guides-solver-symbol-reveal {
    transform: rotate(180deg);
}

/* Cluster positions */
.guides-solver__cluster-a { top: 4rem; left: 4rem; }
.guides-solver__cluster-b { bottom: 5rem; right: 5rem; }

/* Standalone dot positions and sizes */
.guides-solver__dot-a { top: 33%; left: 3rem; width: 0.5rem; height: 0.5rem; }
.guides-solver__dot-b { top: 66%; right: 4rem; width: 0.75rem; height: 0.75rem; }
.guides-solver__dot-c { top: 25%; right: 33%; width: 0.5rem; height: 0.5rem; }

/* Inner cluster child positions */
.guides-solver__accent--inner-a { top: 1rem; left: 1.5rem; width: 0.75rem; height: 0.75rem; }
.guides-solver__accent--inner-b { top: 2rem; left: 3rem; width: 0.5rem; height: 0.5rem; }
.guides-solver__accent--inner-c { top: -0.5rem; left: 2rem; width: 1rem; height: 1rem; }

/* Decorative lines */
.guides-solver__line-a { top: 0.25rem; left: 0.25rem; width: 1.5rem; height: 0.125rem; transform: rotate(45deg); }
.guides-solver__line-b { top: 1.25rem; left: 1.75rem; width: 2rem; height: 0.125rem; transform: rotate(12deg); }
.guides-solver__line-c { top: -0.75rem; left: -0.5rem; width: 2.5rem; height: 0.125rem; transform: rotate(-12deg); }
.guides-solver__line-d-pos { top: -0.25rem; left: 1rem; width: 1.5rem; height: 0.125rem; transform: rotate(45deg); }

/* Animation delays */
.guides-solver__accent--delay-1 { animation-delay: 0.3s; }
.guides-solver__accent--delay-2 { animation-delay: 0.5s; }
.guides-solver__accent--delay-4 { animation-delay: 1s; }
.guides-solver__accent--delay-5 { animation-delay: 1.3s; }
.guides-solver__accent--delay-6 { animation-delay: 1.6s; }
.guides-solver__accent--delay-7 { animation-delay: 1.8s; }

@keyframes guides-solver-accent-blink-seq {
    0%, 100% { opacity: 1; }
    50%       { opacity: .5; }
}
.guides-solver__accent--blink {
    animation: guides-solver-accent-blink-seq 2s cubic-bezier(.4,0,.6,1) infinite;
}

@keyframes guides-solver-accent-ripple-seq {
    75%, 100% { transform: scale(2); opacity: 0; }
}
.guides-solver__accent--ripple {
    animation: guides-solver-accent-ripple-seq 1s cubic-bezier(0,0,.2,1) infinite;
}

.guides-solver__accent--offset { top: -1.5rem; left: -1rem; }

.guides-solver__handle--glow:hover { transform: scale(1.05); transition: transform .2s ease; }

.guides-solver__symbol--glow:hover { transform: scale(1.1); transition: transform .2s ease; }