/* ========================================
   archaic.works — Brutalist Excavation
   ======================================== */

:root {
    /* Palette */
    --raw-sienna: #A0522D;
    --burnt-umber: #5C3A28;
    --kiln-charcoal: #1A1714;
    --aged-bone: #F5EDE3;
    --fired-clay: #C67A4A;
    --desert-sand: #D4B896;
    --dark-goldenrod: #B8860B;
    --concrete-ash: #7A6E62;
    --dark-umber: #3B322A;
    --aged-sand: #D4C4B0;

    /* Typography */
    --font-display: 'Alfa Slab One', serif;
    --font-structural: 'Zilla Slab', serif;
    --font-body: 'Source Serif 4', serif;
    --font-mono: 'IBM Plex Mono', monospace;

    /* Spacing */
    --slab-padding-v: 120px;
    --slab-padding-v-narrow: 100px;
    --bar-height: 48px;
}

/* ----------------------------------------
   Reset & Base
   ---------------------------------------- */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.78;
    color: var(--dark-umber);
    background-color: var(--aged-bone);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ----------------------------------------
   SVG Filters (hidden)
   ---------------------------------------- */

.svg-filters {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
}

/* ----------------------------------------
   Noise Overlay
   ---------------------------------------- */

.noise-overlay {
    position: absolute;
    inset: 0;
    filter: url(#noise);
    opacity: 0.04;
    pointer-events: none;
    z-index: 1;
    background: inherit;
}

/* ----------------------------------------
   Fixed Typographic Bar
   ---------------------------------------- */

.top-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    height: var(--bar-height);
    padding: 0 24px;
    background-color: var(--kiln-charcoal);
    border: none;
}

.top-bar__domain {
    font-family: var(--font-structural);
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.12em;
    font-variant: small-caps;
    color: var(--aged-bone);
    text-align: left;
}

.top-bar__nav {
    font-family: var(--font-structural);
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--aged-bone);
    text-align: right;
    cursor: pointer;
}

/* ----------------------------------------
   Slab Base
   ---------------------------------------- */

.slab {
    position: relative;
    width: 100%;
    overflow: hidden;
}

/* Full-bleed slab */
.slab--full {
    min-height: 100vh;
    padding: var(--slab-padding-v) 24px;
}

/* Narrow text slab */
.slab--narrow {
    min-height: 80vh;
    padding: var(--slab-padding-v-narrow) 24px;
}

/* Hero slab */
.slab--hero {
    min-height: 100vh;
    padding: 0 24px;
    display: grid;
    place-items: center;
}

/* Footer slab */
.slab--footer {
    min-height: 40vh;
    padding: 80px 24px;
}

/* ----------------------------------------
   Slab Colors
   ---------------------------------------- */

.slab--sienna {
    background-color: var(--raw-sienna);
}

.slab--burnt-umber {
    background-color: var(--burnt-umber);
}

.slab--charcoal {
    background-color: var(--kiln-charcoal);
}

.slab--bone {
    background-color: var(--aged-bone);
}

.slab--sand {
    background-color: var(--desert-sand);
}

/* ----------------------------------------
   Slab Inner Containers
   ---------------------------------------- */

.slab__inner {
    position: relative;
    z-index: 2;
}

.slab__inner--hero {
    text-align: center;
}

.slab__inner--narrow {
    max-width: 680px;
    margin: 0 auto;
    position: relative;
}

.slab__inner--full {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
}

.slab__inner--centered {
    display: grid;
    place-items: center;
    min-height: calc(100vh - var(--slab-padding-v) * 2);
}

.slab__inner--footer {
    max-width: 680px;
    margin: 0 auto;
    text-align: center;
}

/* ----------------------------------------
   Typography — Display Headings
   ---------------------------------------- */

.hero__title {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(3.5rem, 11vw, 9rem);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--aged-bone);
    line-height: 1.05;
    margin-bottom: 24px;
}

.hero__title .char {
    display: inline-block;
    opacity: 0;
    transform: scale(1.08);
}

.hero__subtitle {
    font-family: var(--font-structural);
    font-weight: 600;
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    color: var(--aged-bone);
    letter-spacing: 0.02em;
    margin-bottom: 64px;
    opacity: 0;
    transition: opacity 600ms ease;
}

.hero__subtitle.visible {
    opacity: 1;
}

.heading-display {
    font-family: var(--font-display);
    font-weight: 400;
    font-size: clamp(2rem, 5vw, 4rem);
    letter-spacing: 0.02em;
    line-height: 1.15;
    margin-bottom: 32px;
}

.heading-display--dark {
    color: var(--kiln-charcoal);
}

.heading-display--bone {
    color: var(--aged-bone);
}

.heading-display--large {
    font-size: clamp(2.5rem, 6vw, 5rem);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    max-width: 900px;
    text-align: center;
}

/* Default display heading on dark bg */
.slab--burnt-umber .heading-display,
.slab--charcoal .heading-display,
.slab--sienna .heading-display {
    color: var(--aged-bone);
}

/* ----------------------------------------
   Typography — Body & Annotations
   ---------------------------------------- */

.body-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.8vw, 1.125rem);
    line-height: 1.78;
    max-width: 62ch;
    margin-bottom: 24px;
}

.body-text--dark {
    color: var(--dark-umber);
}

.body-text--light {
    color: var(--aged-sand);
}

.annotation {
    font-family: var(--font-structural);
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--concrete-ash);
    margin-top: 32px;
}

.mono {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.85em;
    color: var(--concrete-ash);
}

.footer-text {
    font-family: var(--font-structural);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--aged-bone);
    margin-bottom: 12px;
}

.footer-annotation {
    font-size: 0.85rem;
    color: var(--concrete-ash);
}

/* ----------------------------------------
   Structural Headings (h3, h4)
   ---------------------------------------- */

.cell-heading {
    font-family: var(--font-structural);
    font-weight: 600;
    font-size: 1.125rem;
    letter-spacing: 0.02em;
    color: var(--aged-bone);
    margin-bottom: 12px;
}

.cell-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 0.95rem;
    line-height: 1.78;
    color: var(--aged-sand);
    margin-bottom: 16px;
}

.cell-annotation {
    font-size: 0.8rem;
    color: var(--concrete-ash);
}

/* ----------------------------------------
   Grid Interior
   ---------------------------------------- */

.grid-interior {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.grid-cell {
    border: 2px solid var(--aged-bone);
    padding: 32px;
}

/* ----------------------------------------
   Divider Slabs
   ---------------------------------------- */

.divider-slab {
    width: 100%;
    height: 48px;
    position: relative;
    display: grid;
    place-items: center;
}

.divider-slab--charcoal {
    background-color: var(--kiln-charcoal);
}

.divider-slab--clay {
    background-color: var(--fired-clay);
}

.divider-slab--sienna {
    background-color: var(--raw-sienna);
}

.divider-slab--sand {
    background-color: var(--desert-sand);
}

.divider-slab--umber {
    background-color: var(--burnt-umber);
}

/* Keystone Diamond */
.keystone-diamond {
    width: 18px;
    height: 18px;
    background-color: var(--dark-goldenrod);
    transform: rotate(45deg);
}

/* ----------------------------------------
   Chevron Band Dividers
   ---------------------------------------- */

.chevron-band {
    width: 100%;
    height: 24px;
    background-image: repeating-linear-gradient(
        135deg,
        transparent,
        transparent 8px,
        var(--desert-sand) 8px,
        var(--desert-sand) 10px,
        transparent 10px,
        transparent 18px
    );
    background-color: var(--aged-bone);
}

.chevron-band--dark {
    background-image: repeating-linear-gradient(
        135deg,
        transparent,
        transparent 8px,
        var(--concrete-ash) 8px,
        var(--concrete-ash) 10px,
        transparent 10px,
        transparent 18px
    );
    background-color: var(--burnt-umber);
}

/* ----------------------------------------
   Vertical Bar Markers
   ---------------------------------------- */

.vertical-bar {
    position: absolute;
    left: -32px;
    top: 0;
    width: 8px;
    height: 100px;
}

.vertical-bar--ochre {
    background-color: var(--dark-goldenrod);
}

.vertical-bar--clay {
    background-color: var(--fired-clay);
}

/* ----------------------------------------
   Brick Grid Stamp (5x5)
   ---------------------------------------- */

.brick-grid {
    display: grid;
    grid-template-columns: repeat(5, 10px);
    grid-template-rows: repeat(5, 10px);
    gap: 3px;
    position: absolute;
    top: 40px;
    right: 0;
}

.brick-grid--bottom-left {
    top: auto;
    right: auto;
    bottom: 40px;
    left: 0;
}

.brick-grid__square--solid {
    width: 10px;
    height: 10px;
    background-color: var(--kiln-charcoal);
}

.brick-grid__square--outline {
    width: 10px;
    height: 10px;
    border: 2px solid var(--aged-bone);
    background: transparent;
}

/* On dark backgrounds, adjust brick grid */
.slab--charcoal .brick-grid__square--solid {
    background-color: var(--aged-bone);
}

.slab--charcoal .brick-grid__square--outline {
    border-color: var(--concrete-ash);
}

.slab--sienna .brick-grid__square--solid {
    background-color: var(--kiln-charcoal);
}

.slab--sienna .brick-grid__square--outline {
    border-color: var(--aged-bone);
}

/* ----------------------------------------
   Stepped Pyramid (Ziggurat)
   ---------------------------------------- */

.ziggurat {
    display: grid;
    gap: 4px;
    justify-items: center;
    margin-top: 16px;
    direction: ltr;
}

.ziggurat__step {
    height: 12px;
    background-color: var(--aged-bone);
    opacity: 0;
}

.ziggurat__step--1 {
    width: 20%;
}

.ziggurat__step--2 {
    width: 40%;
}

.ziggurat__step--3 {
    width: 60%;
}

.ziggurat__step--4 {
    width: 80%;
}

.ziggurat__step--5 {
    width: 100%;
    max-width: 480px;
}

/* ----------------------------------------
   Zoom-Focus Animation
   ---------------------------------------- */

.zoom-focus {
    transform: scale(0.88);
    opacity: 0.3;
    transition: transform 700ms cubic-bezier(0.22, 0.1, 0.36, 1.0),
                opacity 700ms cubic-bezier(0.22, 0.1, 0.36, 1.0);
}

.zoom-focus.revealed {
    transform: scale(1.0);
    opacity: 1.0;
}

/* ----------------------------------------
   Link Hover State
   ---------------------------------------- */

a {
    color: inherit;
    text-decoration: none;
    position: relative;
    display: inline-block;
}

a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--dark-goldenrod);
    transition: width 200ms ease;
}

a:hover::after {
    width: 100%;
}

/* ----------------------------------------
   Responsive
   ---------------------------------------- */

@media (max-width: 768px) {
    .grid-interior {
        grid-template-columns: 1fr;
    }

    .vertical-bar {
        left: -16px;
        width: 6px;
        height: 80px;
    }

    .slab--full {
        padding: 80px 20px;
    }

    .slab--narrow {
        padding: 80px 20px;
    }

    .slab__inner--narrow {
        padding-left: 24px;
    }

    .brick-grid {
        top: 20px;
    }

    .brick-grid--bottom-left {
        bottom: 20px;
        top: auto;
    }
}

@media (max-width: 480px) {
    .top-bar {
        padding: 0 16px;
    }

    .top-bar__domain,
    .top-bar__nav {
        font-size: 12px;
    }
}