/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: auto;
    overflow-x: hidden;
}

body {
    background-color: #f5efe6;
    color: #2d2226;
    font-family: 'Cormorant Garamond', Georgia, serif;
    font-weight: 400;
    font-size: clamp(1.05rem, 1.8vw, 1.35rem);
    line-height: 1.72;
    overflow-x: hidden;
}

/* ===== DOT-FIELD BACKGROUND ===== */
.dot-field {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(circle 2px at 16px 16px, rgba(45,34,38,0.08) 2px, transparent 2px),
        radial-gradient(circle 2px at 48px 48px, rgba(45,34,38,0.06) 2px, transparent 2px);
    background-size: 32px 32px, 64px 64px;
    will-change: transform;
}

/* ===== SCROLL PROGRESS INDICATOR ===== */
.progress-track {
    position: fixed;
    top: 0;
    right: 12px;
    width: 1px;
    height: 100vh;
    background: rgba(45,34,38,0.1);
    z-index: 1000;
}

.progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 0%;
    background: #8a3a4a;
    transition: height 0.1s linear;
}

.progress-tick {
    position: absolute;
    right: 0;
    width: 8px;
    height: 1px;
    background: #8a3a4a;
    opacity: 0.4;
    transition: opacity 0.3s;
}

.progress-tick[data-pos="0.25"] { top: 25%; }
.progress-tick[data-pos="0.50"] { top: 50%; }
.progress-tick[data-pos="0.75"] { top: 75%; }
.progress-tick[data-pos="1.00"] { top: calc(100% - 1px); }

.progress-tick span {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 300;
    font-size: clamp(0.7rem, 1vw, 0.85rem);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #8a3a4a;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.4s;
}

.progress-tick.active {
    opacity: 1;
}

.progress-tick.active span {
    opacity: 1;
    color: #d4a04a;
}

/* ===== STRATA (SECTIONS) ===== */
.stratum {
    position: relative;
    z-index: 1;
    contain: layout style;
}

/* --- Stratum Alpha --- */
.stratum-alpha {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(to bottom, #f5efe6, #e8ddd2);
    overflow: hidden;
}

.alpha-wireframes {
    position: absolute;
    inset: 0;
    pointer-events: none;
    will-change: transform;
}

.wireframe {
    position: absolute;
    border: 1.5px solid rgba(92,26,42,0.08);
    border-radius: 50%;
}

.wf-1 {
    width: 60vw;
    height: 60vw;
    top: 20%;
    left: 20%;
}

.wf-2 {
    width: 40vw;
    height: 40vw;
    top: 30%;
    left: 35%;
    border-radius: 0;
    transform: rotate(45deg);
}

.wf-3 {
    width: 50vw;
    height: 50vw;
    top: 15%;
    left: 25%;
    border-radius: 50% 0 50% 0;
}

.alpha-question {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 2rem;
    will-change: transform, opacity;
}

.hero-question {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: clamp(3.5rem, 10vw, 12rem);
    letter-spacing: -0.03em;
    line-height: 1.05;
    color: #5c1a2a;
    clip-path: inset(50% 50% 50% 50%);
}

.hero-question.revealed {
    clip-path: inset(0% 0% 0% 0%);
}

/* --- Stratum Beta --- */
.stratum-beta {
    min-height: 150vh;
    background: linear-gradient(to bottom, #e8ddd2, #f5efe6);
}

.premise {
    min-height: 50vh;
    display: grid;
    grid-template-columns: 1fr 1.5fr 1fr;
    align-items: center;
    padding: 4rem 5vw;
    position: relative;
    overflow: hidden;
}

.premise-numeral {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 300;
    font-size: clamp(8rem, 20vw, 40rem);
    color: #5c1a2a;
    opacity: 0.15;
    line-height: 1;
    will-change: transform;
    text-align: center;
}

.premise-body {
    padding: 2rem 3rem;
}

.premise-body p {
    max-width: 55ch;
    margin: 0 auto;
}

.premise-diagram {
    position: relative;
    width: 100%;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(60px);
    transition: none;
}

.premise-diagram.spring-in {
    opacity: 1;
    transform: translateY(0);
}

/* Venn circles */
.venn-circle {
    position: absolute;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 1.5px solid #5c1a2a;
    background: transparent;
    will-change: transform;
}

.premise-1 .vc-1 { transform: translateX(-25px); }
.premise-1 .vc-2 { transform: translateX(25px); }
.premise-1 .venn-overlap {
    position: absolute;
    width: 50px;
    height: 80px;
    border-radius: 50%;
    background: rgba(196,114,126,0.2);
}

.premise-2 .vc-1 { transform: translate(-35px, -15px); }
.premise-2 .vc-2 { transform: translate(35px, -15px); }
.premise-2 .vc-3 { transform: translateY(25px); }
.premise-2 .venn-overlap {
    position: absolute;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(196,114,126,0.2);
}

/* Branch tree (Premise III) */
.branch-tree {
    position: relative;
    width: 160px;
    height: 160px;
}

.branch-node {
    position: absolute;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: 1.5px solid #5c1a2a;
    background: rgba(196,114,126,0.3);
}

.bn-root { top: 10%; left: 50%; transform: translateX(-50%); }
.bn-left { bottom: 15%; left: 15%; }
.bn-right { bottom: 15%; right: 15%; }

.branch-line {
    position: absolute;
    width: 1.5px;
    height: 80px;
    background: #8a3a4a;
    transform-origin: top center;
}

.bl-left {
    top: 20%;
    left: 50%;
    transform: translateX(-50%) rotate(-30deg);
}

.bl-right {
    top: 20%;
    left: 50%;
    transform: translateX(-50%) rotate(30deg);
}

/* Curve connectors between premises */
.curve-connector {
    width: 100%;
    height: 80px;
    position: relative;
    overflow: hidden;
}

.curve-connector::before,
.curve-connector::after {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    border: 2px solid #8a3a4a;
    border-radius: 50%;
    opacity: 0.3;
}

.curve-connector::before {
    top: -100px;
    left: 30%;
    border-bottom-color: transparent;
    border-left-color: transparent;
}

.curve-connector::after {
    top: -100px;
    right: 30%;
    border-bottom-color: transparent;
    border-right-color: transparent;
}

/* --- Stratum Gamma --- */
.stratum-gamma {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(to bottom, #f5efe6, #5c1a2a);
    overflow: hidden;
    position: relative;
}

.convergence-container {
    position: relative;
    width: 300px;
    height: 300px;
    margin-bottom: 3rem;
}

.convergence-element {
    position: absolute;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: 1.5px solid #c4727e;
    will-change: transform;
    transition: none;
}

.ce-left { top: 50%; left: 0; transform: translate(0, -50%); }
.ce-center { top: 0; left: 50%; transform: translate(-50%, 0); }
.ce-right { top: 50%; right: 0; transform: translate(0, -50%); }

.convergence-spiral {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120px;
    height: 120px;
    transform: translate(-50%, -50%) scale(1.5);
    border-radius: 50%;
    background: conic-gradient(
        from 0deg,
        transparent 0deg,
        rgba(196,114,126,0.3) 60deg,
        transparent 120deg,
        rgba(138,58,74,0.2) 180deg,
        transparent 240deg,
        rgba(212,160,74,0.2) 300deg, /* #d4a04a */
        transparent 360deg
    );
    will-change: transform;
    opacity: 0;
    transition: opacity 0.6s;
}

.convergence-spiral.visible {
    opacity: 1;
}

.synthesis-text {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 5rem);
    color: #f5efe6;
    text-align: center;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s, transform 0.8s;
}

.synthesis-text.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Stratum Delta --- */
.stratum-delta {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f5efe6;
    border-top: 4px solid rgba(92,26,42,0.15);
    padding: 4rem 2rem;
}

.proof-statement {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 5rem);
    color: #5c1a2a;
    text-align: center;
    letter-spacing: -0.03em;
    line-height: 1.2;
    max-width: 20ch;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s, transform 1s;
}

.proof-statement.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Stratum Epsilon --- */
.stratum-epsilon {
    min-height: 50vh;
    background: linear-gradient(to bottom, #f5efe6, transparent);
    position: relative;
    overflow: visible;
}

.residue-container {
    position: relative;
    width: 100%;
    height: 50vh;
    overflow: visible;
}

.residue-fragment {
    position: absolute;
    font-family: 'Cormorant Garamond', serif;
    font-style: italic;
    font-weight: 400;
    font-size: clamp(0.9rem, 1.5vw, 1.15rem);
    color: #2d2226;
    opacity: 0.6;
    white-space: nowrap;
    will-change: transform;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .premise {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        text-align: center;
        padding: 3rem 1.5rem;
    }

    .premise-numeral {
        font-size: clamp(5rem, 20vw, 12rem);
    }

    .premise-body {
        padding: 1rem;
    }

    .premise-diagram {
        height: 150px;
    }

    .hero-question {
        font-size: clamp(2.5rem, 10vw, 6rem);
    }
}