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

:root {
    --white: #ffffff;
    --light-1: #f0f0f0;
    --light-2: #e8e8e8;
    --light-3: #d0d0d0;
    --mid: #999999;
    --mid-dark: #666666;
    --dark-1: #404040;
    --dark-2: #333333;
    --near-black: #1a1a1a;

    --font-primary: 'Space Grotesk', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;

    --block-w: 140px;
    --block-h: 60px;
    --block-d: 40px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background: var(--white);
    color: var(--dark-2);
    overflow-x: hidden;
}

/* === TYPOGRAPHY === */
.mono-tag {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--mid);
}

h1, h2 {
    font-family: var(--font-primary);
    font-weight: 500;
    letter-spacing: -0.015em;
    line-height: 1.15;
}

/* === CHAMBERS === */
.chamber {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chamber-inner {
    width: 100%;
    max-width: 1200px;
    padding: 4rem 2rem;
    position: relative;
}

/* === CHAMBER 1: WORKBENCH === */
.chamber-workbench {
    background: var(--white);
}

.chamber-workbench .chamber-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.workbench-label {
    margin-bottom: 3rem;
}

.site-title {
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 300;
    color: var(--near-black);
    margin-bottom: 0.5rem;
}

.site-title .dot {
    color: var(--mid);
}

.site-subtitle {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 300;
    color: var(--mid);
    letter-spacing: 0.12em;
    margin-bottom: 4rem;
}

/* Isometric grid on workbench */
.workbench-grid {
    position: relative;
    width: 400px;
    height: 200px;
    transform: rotateX(60deg) rotateZ(-45deg);
    transform-style: preserve-3d;
    margin-bottom: 4rem;
}

.grid-line {
    position: absolute;
    left: 0;
    top: calc(var(--i) * 28px);
    width: 100%;
    height: 1px;
    background: var(--light-2);
}

.grid-line::after {
    content: '';
    position: absolute;
    top: calc(var(--i) * -28px);
    left: calc(var(--i) * 50px);
    width: 1px;
    height: 200px;
    background: var(--light-2);
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    animation: breathe 3s ease-in-out infinite;
}

.scroll-arrow {
    width: 1px;
    height: 40px;
    background: var(--light-3);
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: -4px;
    width: 9px;
    height: 9px;
    border-right: 1px solid var(--light-3);
    border-bottom: 1px solid var(--light-3);
    transform: rotate(45deg);
}

@keyframes breathe {
    0%, 100% { opacity: 0.4; transform: translateY(0); }
    50% { opacity: 1; transform: translateY(6px); }
}

/* === CHAMBER 2: ASSEMBLY === */
.chamber-assembly {
    background: var(--light-1);
    min-height: 150vh;
}

.chamber-assembly .chamber-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 6rem;
}

.chamber-label {
    margin-bottom: 3rem;
    align-self: flex-start;
}

/* Isometric canvas */
.isometric-canvas {
    position: relative;
    width: 700px;
    height: 500px;
    margin: 0 auto;
}

/* === ISOMETRIC BLOCKS === */
.iso-block {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(calc(-50% + var(--bx)), calc(-50% + var(--by)));
    width: var(--block-w);
    opacity: 0;
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.iso-block.visible {
    opacity: 1;
}

.iso-face {
    position: absolute;
}

.iso-top {
    width: var(--block-w);
    height: var(--block-h);
    background: var(--white);
    border: 1px solid var(--light-3);
    transform: rotateX(60deg) rotateZ(-45deg);
    transform-origin: bottom left;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    z-index: 2;
}

.iso-right {
    width: var(--block-w);
    height: var(--block-d);
    background: var(--light-2);
    border: 1px solid var(--light-3);
    border-top: none;
    transform: skewX(-45deg) translateY(29px);
    transform-origin: top left;
    z-index: 1;
}

.iso-left {
    width: var(--block-d);
    height: var(--block-h);
    background: var(--light-3);
    border: 1px solid var(--d0d0d0);
    transform: skewY(-45deg) translateX(-20px);
    transform-origin: top right;
    z-index: 1;
}

.block-label {
    font-family: var(--font-mono);
    font-size: 0.6rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--mid-dark);
}

.block-text {
    font-family: var(--font-primary);
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--mid);
    margin-top: 2px;
}

/* Inference block - slightly larger */
.iso-block.inference {
    --block-w: 160px;
    --block-h: 70px;
    --block-d: 45px;
}

.iso-block.inference .iso-top {
    background: var(--light-1);
}

/* Conclusion block - emphasized */
.iso-block.conclusion-block {
    --block-w: 180px;
    --block-h: 80px;
    --block-d: 50px;
}

.iso-block.conclusion-block .iso-top {
    background: var(--near-black);
    border-color: var(--dark-1);
}

.iso-block.conclusion-block .iso-right {
    background: var(--dark-1);
    border-color: var(--dark-2);
}

.iso-block.conclusion-block .iso-left {
    background: var(--dark-2);
}

.iso-block.conclusion-block .block-label,
.iso-block.conclusion-block .block-text {
    color: var(--white);
}

/* Connectors */
.connectors {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.connector {
    stroke: var(--light-3);
    stroke-width: 1;
    stroke-dasharray: 4 4;
    opacity: 0;
    transition: opacity 0.8s ease;
}

.connector.visible {
    opacity: 1;
}

/* Annotations */
.assembly-annotations {
    margin-top: 4rem;
    text-align: center;
}

.annotation {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--mid);
    opacity: 0;
    transition: opacity 0.6s ease;
    position: absolute;
    width: 100%;
    text-align: center;
}

.annotation.active {
    opacity: 1;
    position: relative;
}

/* === CHAMBER 3: RESOLUTION === */
.chamber-resolution {
    background: var(--white);
    min-height: 100vh;
}

.chamber-resolution .chamber-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.resolution-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4rem;
}

.resolution-block {
    position: relative;
    width: 200px;
    height: 140px;
}

.resolution-block .iso-block {
    opacity: 1;
    --block-w: 200px;
    --block-h: 100px;
    --block-d: 60px;
    left: 50%;
    top: 50%;
}

.resolution-block .iso-top {
    background: var(--near-black);
    border-color: var(--dark-1);
}

.resolution-block .iso-right {
    background: var(--dark-1);
    border-color: var(--dark-2);
}

.resolution-block .iso-left {
    background: var(--dark-2);
}

.resolution-block .block-label {
    color: var(--white);
    font-size: 0.9rem;
    font-weight: 500;
}

.resolution-text {
    text-align: center;
    max-width: 500px;
}

.resolution-headline {
    font-size: clamp(1.8rem, 4vw, 3.5rem);
    font-weight: 500;
    color: var(--near-black);
    margin-bottom: 1.5rem;
}

.resolution-body {
    font-size: 1rem;
    font-weight: 300;
    line-height: 1.7;
    color: var(--mid-dark);
    margin-bottom: 2rem;
}

.resolution-line {
    width: 60px;
    height: 1px;
    background: var(--light-3);
    margin: 0 auto 2rem;
}

.resolution-coda {
    font-size: 0.75rem;
    letter-spacing: 0.15em;
}

/* === PROGRESS TRACK === */
.progress-track {
    position: fixed;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 120px;
    background: var(--light-2);
    z-index: 100;
}

.progress-fill {
    width: 100%;
    height: 0%;
    background: var(--dark-2);
    transition: height 0.3s ease;
}

.progress-markers {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.marker {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--light-3);
    transition: background 0.3s ease;
}

.marker.active {
    background: var(--dark-2);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .isometric-canvas {
        width: 100%;
        height: 400px;
        transform: scale(0.7);
    }

    .progress-track {
        right: 1rem;
    }

    .chamber-inner {
        padding: 2rem 1rem;
    }

    .workbench-grid {
        width: 250px;
        height: 125px;
    }
}