/* =================================================================
   resar.one  --  wabi-sabi luxury / ma-negative-space / tilt-3d
   Palette: gold-black-luxury
   Fonts: Libre Baskerville (Google Fonts), Source Serif 4 (Google Fonts), JetBrains Mono (Google Fonts)
   ================================================================= */

:root {
    --void-black: #0A0A0A;
    --reasoning-gold: #C9A84C;
    --aged-parchment: #E8DFD0;
    --weathered-bronze: #8B7355;
    --wabi-gray: #4A4540;
    --patina-green: #6B7B60;
    --warm-charcoal: #2A2520;

    --font-headline: "Libre Baskerville", "Source Serif 4", Georgia, serif;
    --font-body: "Source Serif 4", "Libre Baskerville", Georgia, serif;
    --font-mono: "JetBrains Mono", "Courier New", monospace;

    --tilt-x: 0;
    --tilt-y: 0;
    --frame-tilt-x: 0;
    --frame-tilt-y: 0;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    background: var(--void-black);
    scroll-behavior: smooth;
}

body {
    background: var(--void-black);
    color: var(--aged-parchment);
    font-family: var(--font-body);
    font-size: clamp(16px, 1.5vw, 18px);
    line-height: 1.85;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* ----------------- WABI-SABI NOISE OVERLAY ----------------- */
.noise-overlay {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 100;
    opacity: 0.06;
    mix-blend-mode: overlay;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.91 0 0 0 0 0.87 0 0 0 0 0.81 0 0 0 0.6 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
}

/* ============================================================
   THE THRESHOLD
   ============================================================ */

.threshold {
    position: relative;
    min-height: 100vh;
    padding: clamp(40px, 6vh, 96px) clamp(24px, 5vw, 96px);
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 1400px;
    overflow: hidden;
}

.threshold-stage {
    position: relative;
    width: min(960px, 92%);
    aspect-ratio: 10 / 7;
    transform-style: preserve-3d;
    transform: rotateX(calc(var(--frame-tilt-y) * -3deg)) rotateY(calc(var(--frame-tilt-x) * 4deg));
    transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.gold-frame {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    fill: none;
    stroke: var(--reasoning-gold);
    stroke-width: 1;
    overflow: visible;
}

.gold-frame-path {
    stroke-width: 1.2;
    stroke-dasharray: 3200;
    stroke-dashoffset: 3200;
    animation: draw-frame 1.8s cubic-bezier(0.6, 0.2, 0.2, 1) 0.3s forwards;
    filter: drop-shadow(0 0 6px rgba(201, 168, 76, 0.18));
}

.gold-frame-inner {
    stroke: var(--weathered-bronze);
    stroke-width: 0.5;
    stroke-dasharray: 3000;
    stroke-dashoffset: 3000;
    opacity: 0.7;
    animation: draw-frame 2s cubic-bezier(0.6, 0.2, 0.2, 1) 0.7s forwards;
}

.gold-cross {
    stroke: var(--reasoning-gold);
    stroke-width: 1;
    opacity: 0;
    animation: cross-fade 1.2s ease-out 1.4s forwards;
}

@keyframes draw-frame {
    to { stroke-dashoffset: 0; }
}
@keyframes cross-fade {
    to { opacity: 0.8; }
}

.threshold-content {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    transform: translateZ(60px);
    padding: clamp(24px, 6vw, 80px);
}

.threshold-meta {
    display: block;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--weathered-bronze);
    opacity: 0;
    animation: fade-up 1.2s ease-out 1.0s forwards;
    margin-bottom: clamp(28px, 4vh, 48px);
}

.wordmark {
    font-family: var(--font-headline);
    font-weight: 700;
    font-size: clamp(48px, 8vw, 112px);
    letter-spacing: -0.02em;
    color: var(--aged-parchment);
    line-height: 1;
    opacity: 0;
    transform: scale(0.98);
    animation: wordmark-in 1.6s cubic-bezier(0.2, 0.7, 0.2, 1) 1.2s forwards;
    text-shadow: 0 0 40px rgba(201, 168, 76, 0.08);
}

.wordmark-dot {
    color: var(--reasoning-gold);
    font-style: italic;
    display: inline-block;
    transform: translateY(-0.06em);
}

@keyframes wordmark-in {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.threshold-tagline {
    font-family: var(--font-body);
    font-style: italic;
    font-size: clamp(14px, 1.4vw, 17px);
    color: var(--aged-parchment);
    opacity: 0;
    margin-top: clamp(20px, 3vh, 36px);
    max-width: 480px;
    line-height: 1.6;
    animation: fade-up 1.4s ease-out 1.8s forwards;
}

.threshold-stamp {
    display: block;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.5em;
    text-transform: uppercase;
    color: var(--wabi-gray);
    margin-top: clamp(28px, 5vh, 56px);
    opacity: 0;
    animation: fade-up 1.4s ease-out 2.2s forwards;
}

@keyframes fade-up {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- threshold collage fragments --- */
.fragment {
    position: absolute;
    max-width: 280px;
    padding: 18px 22px;
    background: var(--warm-charcoal);
    color: var(--aged-parchment);
    font-family: var(--font-body);
    font-size: 13px;
    line-height: 1.55;
    opacity: 0;
    z-index: 4;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(139, 115, 85, 0.3);
}

.fragment::before {
    content: "";
    position: absolute;
    inset: -1px;
    background: linear-gradient(135deg, transparent 0%, rgba(201, 168, 76, 0.06) 50%, transparent 100%);
    pointer-events: none;
}

.fragment em {
    color: var(--reasoning-gold);
    font-style: italic;
}

.fragment-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--weathered-bronze);
    margin-bottom: 10px;
    border-bottom: 1px solid rgba(139, 115, 85, 0.3);
    padding-bottom: 6px;
}

.fragment-tl {
    top: 8%;
    left: 3%;
    transform: rotate(-3deg) translateX(-40px);
    clip-path: polygon(0 8%, 6% 0, 95% 4%, 100% 12%, 98% 88%, 94% 100%, 8% 96%, 0 90%);
    animation: fragment-slide-in 1s cubic-bezier(0.2, 0.7, 0.2, 1) 1.8s forwards;
}

.fragment-br {
    bottom: 10%;
    right: 4%;
    transform: rotate(2.5deg) translateX(40px);
    clip-path: polygon(2% 6%, 100% 0, 96% 92%, 88% 100%, 6% 98%, 0 88%, 4% 14%);
    text-align: center;
    animation: fragment-slide-in 1s cubic-bezier(0.2, 0.7, 0.2, 1) 2.0s forwards;
    font-family: var(--font-mono);
    font-size: 14px;
    letter-spacing: 0.05em;
}

.fragment-bl {
    bottom: 16%;
    left: 5%;
    transform: rotate(-1.5deg) translateY(40px);
    clip-path: polygon(4% 0, 100% 6%, 96% 100%, 0 92%);
    max-width: 240px;
    animation: fragment-slide-in 1s cubic-bezier(0.2, 0.7, 0.2, 1) 2.2s forwards;
}

@keyframes fragment-slide-in {
    to {
        opacity: 1;
        transform: rotate(var(--final-rot, -2deg)) translate(0, 0);
    }
}

.fragment-tl { --final-rot: -3deg; }
.fragment-br { --final-rot: 2.5deg; }
.fragment-bl { --final-rot: -1.5deg; }

/* --- accent lines --- */
.accent-lines {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.accent-line {
    fill: none;
    stroke: var(--reasoning-gold);
    stroke-width: 0.15;
    opacity: 0.25;
    stroke-dasharray: 200;
    stroke-dashoffset: 200;
    animation: accent-draw 2.5s ease-out 1.4s forwards;
    vector-effect: non-scaling-stroke;
}

@keyframes accent-draw {
    to { stroke-dashoffset: 0; }
}

.threshold-scroll-cue {
    position: absolute;
    bottom: clamp(20px, 4vh, 40px);
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--weathered-bronze);
    opacity: 0;
    animation: scroll-cue 2.4s ease-in-out 2.6s infinite;
}

@keyframes scroll-cue {
    0%, 100% { opacity: 0; transform: translate(-50%, 0); }
    40%, 60% { opacity: 0.7; transform: translate(-50%, 6px); }
}

/* ============================================================
   REASONING CHAMBERS
   ============================================================ */

.chamber {
    position: relative;
    display: grid;
    align-items: center;
    gap: clamp(40px, 6vw, 96px);
    padding: 0 clamp(24px, 7vw, 120px);
    margin-block: clamp(120px, 15vh, 200px);
    max-width: 1400px;
    margin-inline: auto;
    perspective: 1200px;
}

.chamber-left {
    grid-template-columns: 1.1fr 0.9fr;
}
.chamber-right {
    grid-template-columns: 0.9fr 1.1fr;
}

.chamber-num {
    position: absolute;
    top: -60px;
    font-family: var(--font-headline);
    font-style: italic;
    font-weight: 400;
    font-size: clamp(48px, 6vw, 92px);
    color: var(--wabi-gray);
    opacity: 0.6;
    letter-spacing: -0.02em;
    pointer-events: none;
}

.chamber-left .chamber-num { left: clamp(24px, 7vw, 120px); }
.chamber-right .chamber-num { right: clamp(24px, 7vw, 120px); }

.chamber-block {
    max-width: 600px;
}

.chamber-right .chamber-block {
    margin-left: auto;
}

.chamber-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--reasoning-gold);
    margin-bottom: 24px;
    padding-left: 22px;
    position: relative;
}

.chamber-label::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 16px;
    height: 1px;
    background: var(--reasoning-gold);
}

.chamber-heading {
    font-family: var(--font-headline);
    font-weight: 700;
    font-size: clamp(30px, 4.6vw, 58px);
    line-height: 1.18;
    letter-spacing: -0.02em;
    color: var(--aged-parchment);
    margin-bottom: clamp(28px, 4vh, 48px);
}

.chamber-heading em {
    font-style: italic;
    font-weight: 400;
    color: var(--reasoning-gold);
}

.chamber-body {
    font-family: var(--font-body);
    font-size: clamp(16px, 1.4vw, 18px);
    line-height: 1.85;
    color: var(--aged-parchment);
    margin-bottom: 22px;
    max-width: 56ch;
}

.chamber-body em {
    font-style: italic;
    color: var(--weathered-bronze);
}

.gold-accent {
    color: var(--reasoning-gold);
    font-style: italic;
    font-weight: 600;
    background: linear-gradient(transparent 80%, rgba(201, 168, 76, 0.12) 80%);
    padding: 0 2px;
}

/* --- chamber fragments (tilt cards) --- */
.chamber-fragment {
    position: relative;
    padding: 36px 32px;
    background: linear-gradient(145deg, var(--warm-charcoal) 0%, #14110D 100%);
    border: 1px solid rgba(201, 168, 76, 0.25);
    color: var(--aged-parchment);
    transform-style: preserve-3d;
    transform: perspective(800px) rotateY(calc(var(--tilt-x, 0) * 5deg)) rotateX(calc(var(--tilt-y, 0) * -5deg));
    transition: transform 0.4s cubic-bezier(0.2, 0.7, 0.2, 1);
    will-change: transform;
    box-shadow:
        0 30px 60px rgba(0, 0, 0, 0.55),
        inset 0 1px 0 rgba(232, 223, 208, 0.04);
    clip-path: polygon(2% 0, 100% 1%, 98% 96%, 96% 100%, 4% 99%, 0 92%, 1% 6%);
}

.chamber-fragment::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 20%, rgba(201, 168, 76, 0.08), transparent 60%),
        radial-gradient(ellipse at 80% 90%, rgba(107, 123, 96, 0.05), transparent 60%);
    pointer-events: none;
    transform: translateZ(1px);
}

.chamber-fragment::after {
    content: "";
    position: absolute;
    inset: 12px;
    border: 0.5px solid rgba(139, 115, 85, 0.4);
    pointer-events: none;
    transform: translateZ(20px);
}

.fragment-glyph {
    width: 100%;
    max-width: 200px;
    height: auto;
    color: var(--reasoning-gold);
    margin: 0 auto 18px;
    display: block;
    transform: translateZ(30px);
}

.fragment-cite {
    display: block;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--weathered-bronze);
    text-align: center;
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid rgba(139, 115, 85, 0.3);
    transform: translateZ(20px);
}

.parchment-sheet {
    background: linear-gradient(180deg, rgba(232, 223, 208, 0.04) 0%, rgba(232, 223, 208, 0.02) 100%);
    padding: 24px 22px;
    border-left: 2px solid var(--reasoning-gold);
    border-right: 1px solid rgba(139, 115, 85, 0.2);
    font-family: var(--font-body);
    font-size: 14px;
    line-height: 1.9;
    color: var(--aged-parchment);
    transform: translateZ(25px);
}

.parchment-line {
    display: block;
    font-style: italic;
    margin-bottom: 8px;
}

.parchment-line-conclusion {
    margin-top: 14px;
    padding-top: 10px;
    border-top: 1px dashed rgba(201, 168, 76, 0.3);
    color: var(--reasoning-gold);
    font-style: normal;
    font-weight: 600;
}

/* ma grid */
.ma-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 60px);
    gap: 22px;
    padding: 20px;
    transform: translateZ(25px);
}

.ma-cell {
    border: 0.5px solid rgba(139, 115, 85, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--reasoning-gold);
    font-size: 22px;
    background: rgba(10, 10, 10, 0.6);
}

.ma-cell-filled {
    background: var(--reasoning-gold);
    color: var(--void-black);
    border-color: var(--reasoning-gold);
}

/* ============================================================
   THE PROOF GALLERY
   ============================================================ */

.gallery {
    position: relative;
    padding: 0 clamp(24px, 7vw, 120px);
    margin-block: clamp(120px, 15vh, 200px);
    max-width: 1500px;
    margin-inline: auto;
    perspective: 1500px;
}

.gallery-header {
    max-width: 720px;
    margin-bottom: clamp(60px, 8vh, 100px);
}

.gallery-eyebrow {
    display: block;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--reasoning-gold);
    margin-bottom: 24px;
    padding-left: 22px;
    position: relative;
}

.gallery-eyebrow::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 16px;
    height: 1px;
    background: var(--reasoning-gold);
}

.gallery-heading {
    font-family: var(--font-headline);
    font-weight: 700;
    font-size: clamp(28px, 4vw, 52px);
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--aged-parchment);
}

.gallery-heading em {
    font-style: italic;
    color: var(--reasoning-gold);
    font-weight: 400;
}

.proof-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: clamp(24px, 3vw, 48px);
    align-items: stretch;
}

.proof-card {
    position: relative;
    padding: 36px 30px 90px;
    background: linear-gradient(160deg, var(--warm-charcoal) 0%, #1A1612 60%, #0F0D0A 100%);
    border: 1px solid rgba(201, 168, 76, 0.18);
    color: var(--aged-parchment);
    transform-style: preserve-3d;
    transform: perspective(800px) rotateY(calc(var(--tilt-x, 0) * 5deg)) rotateX(calc(var(--tilt-y, 0) * -5deg));
    transition: transform 0.4s cubic-bezier(0.2, 0.7, 0.2, 1), border-color 0.4s ease, box-shadow 0.4s ease;
    will-change: transform;
    box-shadow:
        0 20px 40px rgba(0, 0, 0, 0.5),
        inset 0 1px 0 rgba(232, 223, 208, 0.04);
    overflow: hidden;
    min-height: 360px;
    cursor: default;
}

.proof-card::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at calc(50% + var(--tilt-x, 0) * 25%) calc(50% + var(--tilt-y, 0) * 25%), rgba(201, 168, 76, 0.12), transparent 55%);
    pointer-events: none;
    transition: background 0.3s ease;
}

.proof-card::after {
    content: "";
    position: absolute;
    inset: 14px;
    border: 0.5px solid rgba(139, 115, 85, 0.25);
    pointer-events: none;
    transform: translateZ(20px);
}

.proof-card:hover {
    border-color: rgba(201, 168, 76, 0.5);
    box-shadow:
        0 30px 60px rgba(0, 0, 0, 0.65),
        0 0 0 1px rgba(201, 168, 76, 0.2),
        inset 0 1px 0 rgba(232, 223, 208, 0.08);
}

.proof-num {
    display: block;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--weathered-bronze);
    margin-bottom: 22px;
    padding-bottom: 10px;
    border-bottom: 1px solid rgba(139, 115, 85, 0.3);
    transform: translateZ(40px);
}

.proof-heading {
    font-family: var(--font-headline);
    font-weight: 700;
    font-size: clamp(20px, 1.7vw, 24px);
    line-height: 1.3;
    letter-spacing: -0.01em;
    color: var(--aged-parchment);
    margin-bottom: 18px;
    transform: translateZ(50px);
}

.proof-heading em {
    font-style: italic;
    color: var(--reasoning-gold);
    font-weight: 400;
}

.proof-body {
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.75;
    color: rgba(232, 223, 208, 0.85);
    transform: translateZ(40px);
}

.proof-glyph {
    position: absolute;
    bottom: 20px;
    right: 28px;
    font-family: var(--font-mono);
    font-size: 56px;
    color: var(--reasoning-gold);
    opacity: 0.35;
    line-height: 1;
    transform: translateZ(60px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.proof-card:hover .proof-glyph {
    opacity: 0.85;
    transform: translateZ(60px) scale(1.08);
}

.gallery-margin {
    margin-top: clamp(60px, 8vh, 100px);
    max-width: 580px;
    margin-left: auto;
    padding: 24px 28px;
    border-left: 1px solid var(--reasoning-gold);
    background: linear-gradient(90deg, rgba(201, 168, 76, 0.04), transparent);
}

.gallery-margin-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--reasoning-gold);
    margin-bottom: 10px;
}

.gallery-margin p {
    font-family: var(--font-body);
    font-size: 15px;
    line-height: 1.75;
    font-style: italic;
    color: var(--aged-parchment);
}

.gallery-margin em {
    color: var(--reasoning-gold);
    font-weight: 600;
}

/* ============================================================
   FOUNDATION FOOTER
   ============================================================ */

.foundation {
    position: relative;
    padding: clamp(80px, 12vh, 140px) clamp(24px, 7vw, 120px) clamp(60px, 8vh, 100px);
    max-width: 1400px;
    margin-inline: auto;
    margin-top: clamp(120px, 15vh, 200px);
}

.foundation-divider {
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--wabi-gray) 20%,
        var(--reasoning-gold) 50%,
        var(--wabi-gray) 80%,
        transparent 100%);
    margin-bottom: clamp(60px, 8vh, 100px);
    position: relative;
}

.foundation-divider::before,
.foundation-divider::after {
    content: "";
    position: absolute;
    top: 50%;
    width: 8px;
    height: 8px;
    background: var(--reasoning-gold);
    transform: translateY(-50%) rotate(45deg);
}

.foundation-divider::before { left: 30%; }
.foundation-divider::after { right: 30%; }

.foundation-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(40px, 6vw, 96px);
    margin-bottom: clamp(60px, 8vh, 100px);
}

.foundation-block-right {
    text-align: right;
}

.foundation-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--reasoning-gold);
    margin-bottom: 14px;
}

.foundation-label-second {
    margin-top: 28px;
}

.foundation-line {
    font-family: var(--font-headline);
    font-style: italic;
    font-size: clamp(16px, 1.4vw, 20px);
    color: var(--aged-parchment);
    line-height: 1.6;
}

.foundation-stamp {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 18px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--weathered-bronze);
    padding-top: 40px;
    border-top: 0.5px dashed rgba(139, 115, 85, 0.4);
}

.foundation-stamp-glyph {
    color: var(--reasoning-gold);
    font-size: 14px;
}

/* ============================================================
   FLOATING MARGIN NOTES
   ============================================================ */

.margin-note {
    position: fixed;
    pointer-events: none;
    font-family: var(--font-body);
    font-style: italic;
    font-size: 13px;
    color: rgba(232, 223, 208, 0.4);
    line-height: 1.6;
    max-width: 200px;
    z-index: 50;
    opacity: 0;
    transition: opacity 0.6s ease;
    border-left: 1px solid var(--reasoning-gold);
    padding-left: 12px;
}

.margin-note.is-visible {
    opacity: 1;
}

.margin-note-1 {
    top: 30%;
    right: 2vw;
    transform: rotate(-1deg);
}

.margin-note-2 {
    bottom: 28%;
    left: 2vw;
    transform: rotate(1.5deg);
}

.margin-note-label {
    display: block;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--reasoning-gold);
    margin-bottom: 4px;
    font-style: normal;
}

.margin-note-text {
    display: block;
}

/* ============================================================
   SCROLL REVEAL STATES
   ============================================================ */

.chamber, .gallery, .foundation {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 1.2s cubic-bezier(0.2, 0.7, 0.2, 1), transform 1.2s cubic-bezier(0.2, 0.7, 0.2, 1);
}

.chamber.is-revealed,
.gallery.is-revealed,
.foundation.is-revealed {
    opacity: 1;
    transform: translateY(0);
}

.proof-card {
    opacity: 0;
    transform: perspective(800px) translateY(30px) rotateY(0) rotateX(0);
    transition:
        opacity 1s ease,
        transform 0.4s cubic-bezier(0.2, 0.7, 0.2, 1);
}

.proof-card.is-revealed {
    opacity: 1;
    transform: perspective(800px) rotateY(calc(var(--tilt-x, 0) * 5deg)) rotateX(calc(var(--tilt-y, 0) * -5deg));
    transition-delay: calc(var(--reveal-delay, 0) * 1ms);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 880px) {
    .chamber {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    .chamber-left, .chamber-right {
        grid-template-columns: 1fr;
    }
    .chamber-right .chamber-block {
        margin-left: 0;
    }
    .chamber-num {
        position: relative;
        top: 0;
        font-size: 48px;
        margin-bottom: 12px;
        display: block;
    }
    .chamber-left .chamber-num,
    .chamber-right .chamber-num {
        left: 0;
        right: auto;
    }

    .threshold-stage {
        aspect-ratio: 4 / 5;
    }

    .fragment-tl, .fragment-bl {
        max-width: 200px;
        font-size: 11px;
        padding: 12px 14px;
    }
    .fragment-br {
        max-width: 180px;
    }

    .foundation-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .foundation-block-right {
        text-align: left;
    }

    .margin-note {
        display: none;
    }
}

@media (max-width: 560px) {
    .threshold {
        padding: 32px 16px;
    }
    .fragment-tl { left: 2%; max-width: 160px; }
    .fragment-bl { left: 4%; max-width: 150px; bottom: 8%; }
    .fragment-br { right: 2%; bottom: 4%; max-width: 140px; }

    .proof-card {
        padding: 28px 22px 80px;
        min-height: 320px;
    }

    .proof-glyph {
        font-size: 44px;
    }
}