/* ============================================================
   Synapse — stack-collapse hero (test page)
   The full edge-vision hardware stack — camera, interconnect,
   HBM, Jetson-class GPU module — floats exploded in 3D. As you
   scroll it compresses, flashes, and resolves into one wafer:
   our substrate, where every pixel senses and computes.
   ============================================================ */

.stack-scroll {
    position: relative;
    height: 280vh;
    z-index: 2;
}

.stack-sticky {
    position: sticky;
    top: 0;
    height: 100vh;
    height: 100svh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ---------- 3D stage ---------- */
.stack-stage {
    position: relative;
    width: min(440px, 78vw);
    aspect-ratio: 1;
    margin-top: 8vh;
    perspective: 1300px;
    perspective-origin: 50% 30%;
}

.stack-rig {
    position: absolute;
    inset: 0;
    transform-style: preserve-3d;
    transform: rotateX(62deg) rotateZ(-28deg);
    will-change: transform;
}

.s-layer {
    position: absolute;
    inset: 0;
    will-change: transform, opacity;
    backface-visibility: hidden;
}

.s-layer svg {
    width: 100%;
    height: 100%;
    display: block;
    filter: drop-shadow(0 26px 34px rgba(0, 0, 0, 0.5));
}

/* ---------- collapse flash ---------- */
.stack-flash {
    position: absolute;
    inset: -12%;
    pointer-events: none;
    opacity: 0;
    background: radial-gradient(50% 50% at 50% 50%,
        rgba(190, 220, 255, 0.85) 0%,
        rgba(78, 161, 255, 0.35) 38%,
        transparent 70%);
    will-change: opacity;
}

/* ---------- the wafer (final form) ---------- */
.s-wafer {
    position: absolute;
    inset: 2% 7% 12%;
    opacity: 0;
    pointer-events: none;
    will-change: transform, opacity;
}

.s-wafer svg {
    width: 100%;
    height: 100%;
    overflow: visible;
    filter: drop-shadow(0 34px 70px rgba(0, 0, 0, 0.6));
}

/* dies: slow relax back after the kernel passes = compute trail */
.s-wafer .die {
    transition: fill 0.7s ease;
}

.s-wafer .die.mac {
    fill: #5aa7ff;
    transition: fill 0.06s ease;
}

.s-wafer .die.pulse {
    fill: #8ec2ff;
    transition: fill 0.12s ease;
}

/* rotating specular sheen across the wafer surface */
.s-wafer .sheen {
    animation: sheenSpin 16s linear infinite;
    transform-box: fill-box;
    transform-origin: center;
    opacity: 0.4;
}

@keyframes sheenSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* iridescent patches drift slowly, like the photo's shimmer */
.s-wafer .irid {
    animation: iridDrift 12s ease-in-out infinite alternate;
}

.s-wafer .irid.i2 {
    animation-duration: 9s;
    animation-delay: -4s;
}

@keyframes iridDrift {
    from { transform: translate(0, 0); }
    to { transform: translate(-26px, 18px); }
}

/* ---------- copy ---------- */
.stack-kicker {
    position: absolute;
    top: clamp(3.4rem, 6vh, 4.6rem);
    left: 0;
    right: 0;
    text-align: center;
    font-size: 0.78rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--muted);
    will-change: opacity;
}

.stack-kicker span {
    display: block;
    margin-top: 0.55rem;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: none;
    color: var(--faint);
}

/* side callouts for each layer of the stack */
.stack-labels {
    position: absolute;
    inset: 0;
    pointer-events: none;
    will-change: opacity;
}

.s-tag {
    position: absolute;
    left: max(1.2rem, calc(50% - 460px));
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--muted);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.7rem;
}

.s-tag::after {
    content: "";
    display: block;
    width: clamp(20px, 6vw, 70px);
    height: 1px;
    background: linear-gradient(90deg, rgba(139, 144, 153, 0.7), transparent);
}

.s-tag em {
    font-style: normal;
    color: var(--faint);
    letter-spacing: 0.04em;
    text-transform: none;
}

/* final claim, over the finished wafer */
.stack-final {
    position: absolute;
    left: 0;
    right: 0;
    bottom: clamp(2.4rem, 8vh, 5rem);
    text-align: center;
    padding: 0 1.4rem;
    opacity: 0;
    will-change: opacity, transform;
}

.stack-final h2 {
    font-family: var(--serif);
    font-weight: 400;
    font-size: clamp(1.8rem, 5vw, 2.9rem);
    line-height: 1.1;
    letter-spacing: -0.01em;
    color: #fff;
    text-shadow: 0 2px 30px rgba(5, 6, 8, 0.9);
}

/* the essay resumes right after the wafer — no dead air */
.stack-scroll + .paper {
    padding-top: 0;
}

/* scroll hint */
.stack-hint {
    position: absolute;
    bottom: clamp(1.2rem, 4vh, 2.4rem);
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.7rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--faint);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    will-change: opacity;
}

.stack-hint::after {
    content: "";
    width: 1px;
    height: 26px;
    background: linear-gradient(180deg, var(--faint), transparent);
    animation: hintDrop 1.8s ease-in-out infinite;
}

@keyframes hintDrop {
    0% { transform: translateY(-4px); opacity: 0; }
    30% { opacity: 1; }
    100% { transform: translateY(8px); opacity: 0; }
}

/* ---------- small screens ---------- */
@media (max-width: 860px) {
    .stack-labels { display: none; }
    .stack-scroll { height: 240vh; }
}

/* ---------- reduced motion: show the finished wafer, no ride ---------- */
@media (prefers-reduced-motion: reduce) {
    .stack-scroll { height: 100vh; }
    .stack-hint { display: none; }
    .s-wafer .sheen,
    .s-wafer .irid { animation: none !important; }
}

/* ============================================================
   Manifesto — hidden below the footer; the page reads as done,
   but keep scrolling and the title bar rises into view.
   ============================================================ */
.manifesto {
    position: relative;
    z-index: 2;
    /* tucked just below the footer — hidden at rest, hard to miss
       on the first scroll past the end of the page */
    margin-top: clamp(2.4rem, 7vh, 4.2rem);
    padding: 0 0 6rem;
}

.manifesto-inner {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 clamp(1.4rem, 5vw, 2rem);
}

.manifesto-head {
    display: flex;
    align-items: center;
    gap: 1.4rem;
    margin-bottom: clamp(2.4rem, 7vh, 4rem);
}

.manifesto-rule {
    flex: 1;
    height: 1px;
    background: var(--line);
}

.manifesto-title {
    font-family: var(--serif);
    font-weight: 400;
    font-size: clamp(1.6rem, 4.5vw, 2.3rem);
    letter-spacing: 0.02em;
    color: #fff;
}

.manifesto-essay {
    margin-bottom: clamp(2.6rem, 8vh, 4.5rem);
}

.manifesto-essay-title {
    font-family: var(--serif);
    font-weight: 400;
    font-style: italic;
    font-size: 1.35rem;
    color: var(--text);
    margin-bottom: 1.1rem;
}

/* the subtle pop-up: elements rise and fade in when scrolled to */
.reveal {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity 0.9s ease, transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.in {
    opacity: 1;
    transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}