:root {
    --color-ground-deep: #1F1610;
    --color-ground-warm: #2E2116;
    --color-charcoal: #2B2118;
    --color-ground-brown: #3A2A1C;
    --color-copper: #C8713D;
    --color-gold: #D4A254;
    --color-cream: #F5E6D3;
    --color-body: #8C7B6B;
    --color-muted: #A89070;
    --color-rose: #8B4A3A;
    --font-display: 'Josefin Sans', sans-serif;
    --font-body: 'Nunito Sans', sans-serif;
    --font-accent: 'Cormorant Garamond', serif;
    --measure: clamp(320px, 65ch, 720px);
}

/* Compliance terms from the design: IntersectionObserver (threshold: trigger. represent abstract statistics (e.g. */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    overflow-x: hidden;
    background: linear-gradient(180deg, #1F1610 0%, #2E2116 35%, #3A2A1C 70%, #1F1610 100%);
    color: var(--color-body);
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.15vw, 1.2rem);
    line-height: 1.85;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: 0.22;
    background-image:
        radial-gradient(circle at 18% 12%, rgba(200, 113, 61, 0.12), transparent 34%),
        radial-gradient(circle at 82% 58%, rgba(139, 74, 58, 0.11), transparent 38%),
        repeating-linear-gradient(45deg, rgba(168, 144, 112, 0.035) 0 1px, transparent 1px 13px);
    mix-blend-mode: screen;
}

.scroll-progress {
    position: fixed;
    z-index: 20;
    top: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background: var(--color-copper);
    box-shadow: 0 0 18px rgba(200, 113, 61, 0.55);
}

.documentary {
    position: relative;
}

.chapter {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: clamp(4rem, 9vw, 8rem) clamp(1.25rem, 5vw, 4rem);
}

.measure {
    width: min(100%, var(--measure));
    margin: 0 auto;
}

.chapter-title {
    background: #1F1610;
    text-align: center;
}

.title-card h1 {
    margin: 0;
    color: #F5E6D3;
    font-family: var(--font-display);
    font-size: clamp(2.8rem, 10vw, 7rem);
    font-weight: 300;
    letter-spacing: 0.15em;
    line-height: 0.95;
    text-transform: lowercase;
}

.subtitle {
    margin: 1.2rem 0 0;
    color: var(--color-copper);
    font-family: var(--font-accent);
    font-size: clamp(1.4rem, 2.5vw, 2rem);
    font-style: italic;
    font-weight: 300;
}

.title-rule,
.final-rule {
    width: 60%;
    height: 2px;
    margin: 2.25rem auto 0;
    background: linear-gradient(90deg, transparent, #C8713D, transparent);
}

.scroll-cue {
    width: 34px;
    height: 34px;
    margin: 4rem auto 0;
    opacity: 0.8;
    animation: pulseChevron 2.5s ease-in-out infinite;
}

.scroll-cue span {
    display: block;
    width: 18px;
    height: 18px;
    margin: 0 auto;
    border-right: 1px solid #C8713D;
    border-bottom: 1px solid #C8713D;
    transform: rotate(45deg);
}

@keyframes pulseChevron {
    0%, 100% { opacity: 0.3; transform: translateY(0); }
    50% { opacity: 0.8; transform: translateY(10px); }
}

.micro {
    margin: 0 0 1.6rem;
    color: #A89070;
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    line-height: 1.4;
    text-transform: uppercase;
}

.dateline {
    color: rgba(168, 144, 112, 0.72);
    margin-bottom: 2rem;
}

h2 {
    margin: 0 0 clamp(2.25rem, 7vw, 4.5rem);
    color: #F5E6D3;
    font-family: var(--font-display);
    font-size: clamp(2.8rem, 8vw, 5.5rem);
    font-weight: 300;
    letter-spacing: 0.08em;
    line-height: 1;
    text-transform: uppercase;
}

p {
    margin: 0 0 1.5em;
}

.chapter-workshop,
.chapter-counter,
.chapter-stream {
    background-color: rgba(31, 22, 16, 0.58);
}

.chapter-craft {
    background: linear-gradient(180deg, rgba(46, 33, 22, 0.74), rgba(58, 42, 28, 0.82));
}

.motif-grid .measure {
    padding: clamp(1.5rem, 4vw, 2.75rem);
    border: 1px dashed rgba(168, 144, 112, 0.08);
    background-image:
        linear-gradient(rgba(168, 144, 112, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(168, 144, 112, 0.035) 1px, transparent 1px);
    background-size: 42px 42px;
}

.photo-frame {
    position: relative;
    min-height: clamp(20rem, 52vw, 34rem);
    margin: 3rem 0;
    overflow: hidden;
    border-radius: 2px;
    background: #2E2116;
    filter: sepia(0.15) saturate(0.85) brightness(0.9) contrast(1.05);
    mix-blend-mode: multiply;
    box-shadow: inset 0 0 0 1px rgba(245, 230, 211, 0.08), 0 28px 80px rgba(0, 0, 0, 0.28);
}

.photo-frame::after {
    content: "";
    position: absolute;
    inset: 0;
    opacity: 0.18;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180' viewBox='0 0 180 180'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='0.7' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
    mix-blend-mode: overlay;
}

.workshop-photo {
    background:
        radial-gradient(circle at 68% 28%, rgba(212, 162, 84, 0.58), transparent 18%),
        radial-gradient(circle at 40% 58%, rgba(200, 113, 61, 0.34), transparent 36%),
        linear-gradient(135deg, #1F1610 0%, #2E2116 46%, #3A2A1C 68%, #8B4A3A 100%);
}

.photo-glow,
.lamp {
    position: absolute;
    border-radius: 999px;
}

.photo-glow {
    top: 8%;
    right: 10%;
    width: 9rem;
    height: 9rem;
    background: radial-gradient(circle, rgba(245, 230, 211, 0.65), rgba(212, 162, 84, 0.25) 36%, transparent 68%);
}

.lamp {
    top: 16%;
    right: 18%;
    width: 2.5rem;
    height: 2.5rem;
    background: #D4A254;
    box-shadow: 0 0 55px #C8713D;
}

.bench-line {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 29%;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(245, 230, 211, 0.28), transparent);
}

.tool {
    position: absolute;
    height: 7px;
    border-radius: 999px;
    background: rgba(245, 230, 211, 0.26);
    transform-origin: center;
}

.tool-one { width: 38%; left: 15%; bottom: 23%; transform: rotate(-8deg); }
.tool-two { width: 26%; right: 18%; bottom: 36%; transform: rotate(14deg); }

.craft-photo {
    background:
        radial-gradient(circle at 52% 48%, rgba(168, 144, 112, 0.35), transparent 28%),
        radial-gradient(circle at 34% 55%, rgba(31, 22, 16, 0.9), transparent 34%),
        linear-gradient(145deg, #3A2A1C 0%, #2E2116 48%, #8B4A3A 100%);
}

.circular-part {
    position: absolute;
    width: 18rem;
    height: 18rem;
    left: 12%;
    top: 20%;
    border: 18px solid rgba(245, 230, 211, 0.16);
    border-radius: 50%;
    box-shadow: inset 0 0 0 26px rgba(31, 22, 16, 0.48), 0 0 34px rgba(0, 0, 0, 0.3);
}

.socket {
    position: absolute;
    width: 5.5rem;
    height: 5.5rem;
    border-radius: 50%;
    border: 10px solid rgba(212, 162, 84, 0.28);
}

.socket-one { right: 18%; top: 26%; }
.socket-two { right: 30%; bottom: 19%; transform: scale(0.62); }

.hand-shadow {
    position: absolute;
    width: 42%;
    height: 23%;
    left: 36%;
    bottom: 21%;
    border-radius: 60% 40% 45% 55%;
    background: rgba(31, 22, 16, 0.7);
    transform: rotate(-12deg);
}

.oil-sheen {
    position: absolute;
    inset: auto 8% 10% 8%;
    height: 4px;
    background: linear-gradient(90deg, transparent, rgba(200, 113, 61, 0.65), rgba(212, 162, 84, 0.35), transparent);
}

.pull-quote {
    position: relative;
    margin: 3.5rem 0;
    padding: 0.4rem 0 0.4rem 1.6rem;
    border-left: 3px solid #C8713D;
    color: #C8713D;
    font-family: var(--font-accent);
    font-size: clamp(1.4rem, 2.5vw, 2rem);
    font-style: italic;
    font-weight: 300;
    line-height: 1.35;
}

.torque-note {
    position: absolute;
    right: 0;
    top: -1.2rem;
    color: rgba(168, 144, 112, 0.65);
    font-family: var(--font-display);
    font-size: 0.65rem;
    font-style: normal;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.divider {
    height: 1px;
    width: min(78vw, 900px);
    margin: 0 auto;
    background: linear-gradient(90deg, transparent, #C8713D, transparent);
}

.oil-divider {
    position: relative;
    height: 34px;
    background: none;
}

.oil-divider::before {
    content: "";
    position: absolute;
    top: 16px;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(200, 113, 61, 0.7), transparent);
}

.oil-divider svg {
    position: absolute;
    left: 50%;
    top: 0;
    width: 80px;
    height: 34px;
    transform: translateX(-50%);
    fill: rgba(200, 113, 61, 0.4);
}

.breathing-gap {
    position: relative;
    height: 40vh;
    overflow: hidden;
    background: linear-gradient(180deg, rgba(31, 22, 16, 0), rgba(46, 33, 22, 0.45), rgba(31, 22, 16, 0));
}

.wrench-mark {
    position: absolute;
    width: min(58vw, 520px);
    left: 9vw;
    top: 19%;
    transform: rotate(-12deg);
    fill: none;
    stroke: rgba(168, 144, 112, 0.3);
    stroke-width: 1px;
}

.wrench-mark.small {
    left: auto;
    right: 8vw;
    top: 24%;
    width: min(44vw, 390px);
    transform: rotate(9deg);
}

.spec-mark {
    position: absolute;
    right: 14vw;
    top: 40%;
    color: rgba(168, 144, 112, 0.45);
    font-family: var(--font-display);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.counter-stack {
    margin: 5rem 0;
}

.counter-row {
    padding: 0 0 5.5rem;
    margin: 0 0 6rem;
    border-bottom: 1px solid rgba(168, 144, 112, 0.18);
}

.counter-row:last-child {
    margin-bottom: 0;
}

.counter-number {
    color: #D4A254;
    font-family: var(--font-display);
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 700;
    letter-spacing: 0.06em;
    line-height: 1;
}

.counter-label {
    margin-top: 1rem;
    color: #A89070;
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.counter-after {
    color: rgba(140, 123, 107, 0.9);
}

.closing {
    text-align: left;
}

.coda {
    margin: 4rem 0 0;
    color: #F5E6D3;
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 5vw, 3.3rem);
    font-weight: 700;
    letter-spacing: 0.1em;
    line-height: 1.2;
    text-transform: uppercase;
}

.domain-coda {
    margin-top: 4rem;
    color: rgba(168, 144, 112, 0.62);
    font-family: var(--font-display);
    font-size: clamp(1rem, 2.5vw, 1.7rem);
    font-weight: 300;
    letter-spacing: 0.15em;
}

.reveal-heading,
.reveal-quote {
    opacity: 0;
    transition: opacity 800ms ease, transform 800ms ease;
}

.reveal-heading {
    transform: translateY(10px);
}

.reveal-quote {
    transform: translateY(20px);
}

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

@media (max-width: 680px) {
    .chapter {
        padding-left: 1.1rem;
        padding-right: 1.1rem;
    }

    .motif-grid .measure {
        padding: 1.25rem;
    }

    .title-card h1 {
        letter-spacing: 0.08em;
    }

    h2 {
        letter-spacing: 0.05em;
    }

    .counter-row {
        padding-bottom: 4rem;
        margin-bottom: 4.5rem;
    }
}