:root {
    --cream: #F5EDE0;
    --parchment: #E8DCC8;
    --sand: #8A7A60;
    --sage: #5A6A48;
    --slate: #4A5A6A;
    --indigo: #1A3A5A;
    --deep: #0E1A28;
    --madder: #C46830;
}

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

body {
    background: var(--deep);
    color: var(--cream);
    font-family: 'Nunito Sans', sans-serif;
    font-size: 16px;
    line-height: 1.7;
    overflow-x: hidden;
}

/* The loom background -- visible grid lines */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background:
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent calc(100% / 24 - 1px),
            rgba(26, 58, 90, 0.15) calc(100% / 24 - 1px),
            rgba(26, 58, 90, 0.15) calc(100% / 24)
        ),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 47px,
            rgba(196, 104, 48, 0.10) 47px,
            rgba(196, 104, 48, 0.10) 48px
        );
}

.loom {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Weave sections */
.weave-section {
    display: grid;
    grid-template-columns: repeat(24, 1fr);
    grid-template-rows: repeat(6, 48px);
    position: relative;
    padding: 24px 0;
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.weave-section.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* Title section is always visible */
.section-title {
    opacity: 1;
    transform: none;
    grid-template-rows: repeat(5, 48px);
    padding-top: 80px;
    padding-bottom: 40px;
}

/* Colophon always visible */
.section-colophon {
    opacity: 1;
    transform: none;
    grid-template-rows: repeat(4, 48px);
    padding-bottom: 80px;
}

/* Weave background patterns */
.weave-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.06;
}

/* Plain weave: checkerboard */
.weave-plain {
    background:
        repeating-conic-gradient(
            var(--indigo) 0% 25%,
            transparent 0% 50%
        ) 0 0 / 24px 24px;
}

/* Twill weave: diagonal */
.weave-twill {
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(26, 58, 90, 0.3) 10px,
        rgba(26, 58, 90, 0.3) 12px
    );
}

/* Herringbone */
.weave-herringbone {
    background:
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 8px,
            rgba(26, 58, 90, 0.2) 8px,
            rgba(26, 58, 90, 0.2) 10px
        ),
        repeating-linear-gradient(
            -45deg,
            transparent,
            transparent 8px,
            rgba(196, 104, 48, 0.1) 8px,
            rgba(196, 104, 48, 0.1) 10px
        );
}

/* Thread dividers */
.thread-divider {
    height: 3px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--madder) 10%,
        var(--madder) 90%,
        transparent 100%
    );
    opacity: 0.4;
    margin: 8px 0;
}

/* Content blocks */
.content-block {
    padding: 20px 24px;
    position: relative;
    z-index: 2;
}

.title-block {
    text-align: center;
    padding: 40px 24px;
}

/* Typography */
.display-title {
    font-family: 'Tiro Devanagari Sanskrit', serif;
    font-weight: 400;
    font-size: clamp(1.8rem, 4vw, 3rem);
    color: var(--cream);
    letter-spacing: 0.04em;
    margin-bottom: 12px;
}

.subtitle {
    font-family: 'Nunito Sans', sans-serif;
    font-weight: 400;
    font-size: 16px;
    color: var(--parchment);
    opacity: 0.7;
    font-style: italic;
}

.section-number {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 500;
    font-size: 11px;
    letter-spacing: 0.06em;
    color: var(--madder);
    display: block;
    margin-bottom: 6px;
}

.section-title-text {
    font-family: 'Tiro Devanagari Sanskrit', serif;
    font-weight: 400;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    color: var(--cream);
    margin-bottom: 14px;
}

.body-text {
    font-family: 'Nunito Sans', sans-serif;
    font-weight: 400;
    font-size: 15px;
    line-height: 1.75;
    color: var(--parchment);
    margin-bottom: 12px;
}

/* Spec blocks */
.spec-block {
    border-left: 2px solid var(--madder);
    padding-left: 20px;
}

.spec-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid rgba(138, 122, 96, 0.2);
}

.spec-label {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 12px;
    letter-spacing: 0.04em;
    color: var(--sand);
    text-transform: uppercase;
}

.spec-value {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 500;
    font-size: 13px;
    color: var(--cream);
}

/* Fold diagram */
.fold-diagram {
    display: flex;
    gap: 24px;
    align-items: flex-end;
}

.fold-step {
    text-align: center;
}

.fold-rect {
    border: 2px solid var(--madder);
    margin-bottom: 8px;
}

.fold-rect-1 {
    width: 80px;
    height: 40px;
}

.fold-rect-2 {
    width: 40px;
    height: 40px;
}

.fold-rect-3 {
    width: 30px;
    height: 50px;
    border-radius: 0 0 4px 4px;
}

.fold-label {
    font-family: 'IBM Plex Mono', monospace;
    font-weight: 400;
    font-size: 10px;
    letter-spacing: 0.04em;
    color: var(--sand);
    text-transform: uppercase;
}

/* Colophon */
.colophon-text {
    font-family: 'Nunito Sans', sans-serif;
    font-style: italic;
    font-size: 15px;
    color: var(--sand);
    text-align: center;
    margin-bottom: 16px;
}

.colophon-domain {
    font-family: 'Tiro Devanagari Sanskrit', serif;
    font-weight: 400;
    font-size: 20px;
    letter-spacing: 0.04em;
    color: var(--cream);
    text-align: center;
}

/* Mobile */
@media (max-width: 768px) {
    .weave-section {
        display: block;
        padding: 24px 0;
    }

    .content-block {
        padding: 16px;
    }

    .spec-block {
        margin-top: 16px;
    }

    .fold-diagram {
        gap: 16px;
    }
}