/* ================================================================
   mmiddl.ai — Stylesheet
   Aesthetic: evolved-minimal, dreamy-ethereal
   Layout: off-axis editorial column, asymmetric 12-col grid
   Typography: Commissioner (single family, 200i / 350 / 400 / 600)
   Palette: muted-vintage, anchored on aged paper #ede6d8
   ================================================================ */

:root {
    /* Palette (exact hex values from DESIGN.md) */
    --paper:           #ede6d8;
    --ink:             #2c2a26;
    --graphite:        #5a574f;
    --marginalia:      #8b8478;
    --linen:           #d6cdb9;
    --oxidized-copper: #7a8275;
    --faded-rose:      #b89a8a;

    /* Type */
    --ff-body: "Commissioner", "Inter", "Helvetica Neue", system-ui, sans-serif;
    --fs-body: 1.0625rem;
    --lh-body: 1.7;

    /* Phantom-spine offset for off-axis column */
    --spine-left: 8.333%;     /* col 1 of 12 */
    --col-w: 8.333%;
    --right-margin: 22%;      /* always wider than left -> asymmetric */

    /* Motion */
    --ease-soft: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    overflow-x: hidden;
}

body {
    font-family: var(--ff-body);
    font-weight: 400;
    font-size: var(--fs-body);
    line-height: var(--lh-body);
    color: var(--ink);
    background: var(--paper);
    font-variant-numeric: tabular-nums lining-nums;
    overflow-x: hidden;
    position: relative;

    /* Ledger-paper rule lines: 1px every 1.5rem at 6% opacity in graphite */
    background-image:
        repeating-linear-gradient(
            to bottom,
            transparent 0,
            transparent calc(1.5rem - 1px),
            rgba(90, 87, 79, 0.06) calc(1.5rem - 1px),
            rgba(90, 87, 79, 0.06) 1.5rem
        );
}

img,
svg {
    max-width: 100%;
    display: block;
}

/* Custom scrollbar — thin graphite tick mark on the right edge */
html {
    scrollbar-width: thin;
    scrollbar-color: var(--graphite) transparent;
}

::-webkit-scrollbar {
    width: 6px;
    background: transparent;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--graphite);
    border-radius: 0;
    height: 48px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--ink);
}

/* -------- Typography utility classes -------- */
.section-num {
    font-weight: 600;
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--oxidized-copper);
    font-variant-numeric: tabular-nums;
}

.section-label {
    font-weight: 600;
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--graphite);
}

.section-head {
    grid-column: 1 / -1;
    display: flex;
    align-items: baseline;
    gap: 1.6rem;
    padding-block: 4rem 2rem;
    border-bottom: 0.5px solid rgba(90, 87, 79, 0.18);
    margin-bottom: 3rem;
}

/* -------- Reveal (fade + blur) -------- */
[data-reveal] {
    opacity: 0;
    filter: blur(6px);
    transition:
        opacity 600ms var(--ease-soft),
        filter  600ms var(--ease-soft);
    will-change: opacity, filter;
}

[data-reveal].is-revealed {
    opacity: 1;
    filter: blur(0);
}

/* -------- Threshold (Hero) -------- */
.threshold {
    position: relative;
    min-height: 100vh;
    padding-top: 14vh;     /* offset 14% per DESIGN.md */
    padding-bottom: 8vh;
    padding-left: var(--spine-left);
    padding-right: var(--right-margin);
}

.threshold__grid {
    position: relative;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    column-gap: 1.6vw;
    row-gap: 2.2rem;
    width: 100%;
}

.spine-labels {
    grid-column: 1 / span 1;
    grid-row: 1 / span 6;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.4rem;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--marginalia);
    padding-top: 1rem;
    font-variant-numeric: tabular-nums;
}

.spine-label {
    white-space: nowrap;
}

.threshold__mark {
    grid-column: 3 / span 9;
    grid-row: 1 / span 1;
    font-family: var(--ff-body);
    font-weight: 200;
    font-style: italic;
    font-size: clamp(4.5rem, 12vw, 11rem);
    line-height: 0.95;
    color: var(--ink);
    letter-spacing: -0.02em;
    text-shadow: 0 0 22px rgba(44, 42, 38, 0.06);
    margin-top: 0;
}

.threshold__subtitle {
    grid-column: 3 / span 6;
    grid-row: 2 / span 1;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    font-style: italic;
    font-weight: 350;
    font-size: 1.05rem;
    color: var(--graphite);
    line-height: 1.55;
    margin-top: 1rem;
}

.threshold__sub-line {
    display: block;
}

.threshold__sub-line:nth-child(2) {
    padding-left: 1.4rem;
}

.threshold__sub-line:nth-child(3) {
    padding-left: 2.8rem;
}

.threshold__illustration {
    grid-column: 9 / span 3;
    grid-row: 1 / span 3;
    align-self: start;
    justify-self: start;
    width: 100%;
    max-width: 280px;
    transform: translateY(2rem);
    color: var(--ink);
}

.threshold__illustration .illustration {
    color: var(--ink);
    width: 100%;
    height: auto;
}

.threshold__epigraph {
    grid-column: 4 / span 7;
    grid-row: 4 / span 1;
    margin-top: 5rem;
    font-style: italic;
    font-weight: 350;
    font-size: 1.4rem;
    line-height: 1.5;
    color: var(--graphite);
    letter-spacing: 0.005em;
}

.threshold__epigraph em {
    font-style: italic;
}

.threshold__readout {
    grid-column: 3 / span 8;
    grid-row: 5 / span 1;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.9rem 1.4rem;
    margin-top: 4rem;
    font-variant-numeric: tabular-nums lining-nums;
}

.readout__label {
    font-weight: 600;
    font-size: 0.7rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--marginalia);
}

.readout__value {
    font-weight: 400;
    font-size: 0.9rem;
    color: var(--graphite);
    letter-spacing: 0.02em;
}

.readout__divider {
    display: inline-block;
    width: 1px;
    height: 0.9rem;
    background: rgba(90, 87, 79, 0.35);
    transform: translateY(2px);
}

/* -------- Plate tag (specimen labels) -------- */
.plate-tag {
    font-family: var(--ff-body);
    font-weight: 600;
    font-size: 6px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    fill: var(--marginalia);
    stroke: none;
}

/* -------- Listening section -------- */
.listening {
    position: relative;
    padding-top: 6rem;
    padding-bottom: 6rem;
    padding-left: var(--spine-left);
    padding-right: var(--right-margin);
}

.listening__grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    column-gap: 1.6vw;
    position: relative;
}

.listening__prose {
    grid-column: 2 / span 6;
    display: flex;
    flex-direction: column;
    gap: 1.6rem;
}

.prose {
    max-width: 52ch;
    color: var(--ink);
    font-weight: 400;
    line-height: var(--lh-body);
}

.prose em {
    font-style: italic;
    color: var(--graphite);
}

.listening__diagrams {
    grid-column: 9 / span 4;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding-top: 1rem;
}

/* Specimen plate — double rule frame + tag */
.plate {
    position: relative;
    margin-top: var(--plate-offset, 0);
    padding: 14px;
    background: var(--paper);
    border: 1px solid rgba(44, 42, 38, 0.55);
    box-shadow:
        inset 0 0 0 0.5px transparent,
        0 0 0 0 transparent;
}

.plate::before {
    content: "";
    position: absolute;
    inset: 5px;
    border: 0.5px solid rgba(44, 42, 38, 0.45);
    pointer-events: none;
}

.plate .illustration {
    color: var(--ink);
    width: 100%;
    height: auto;
}

/* -------- Marginalia (right-margin annotations) -------- */
.marginalia {
    position: absolute;
    right: -19%;
    width: 16ch;
    max-width: 16ch;
    color: var(--marginalia);
    font-style: italic;
    font-weight: 350;
    font-size: 13px;
    line-height: 1.55;
    letter-spacing: 0.005em;
    transition: color 200ms var(--ease-soft);
}

.marginalia em {
    font-style: italic;
}

.marg-cite {
    font-style: italic;
    color: var(--faded-rose);
}

.marginalia:hover {
    color: var(--faded-rose);
}

.marginalia-lines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    overflow: visible;
}

.marginalia-lines path {
    stroke: var(--marginalia);
    stroke-width: 1;
    fill: none;
    opacity: 0.55;
}

/* -------- Catalog Strip -------- */
.catalog {
    position: relative;
    padding-top: 6rem;
    padding-bottom: 6rem;
    padding-left: var(--spine-left);
    overflow: hidden;
}

.section-head--catalog {
    margin-right: var(--right-margin);
}

.catalog__viewport {
    width: calc(100vw + 40vw);
    overflow: visible;
    position: relative;
    margin-top: 1rem;
}

.catalog__strip {
    display: flex;
    gap: 2.2rem;
    will-change: transform;
    padding-block: 1rem;
    border-top: 0.5px solid var(--oxidized-copper);
    border-bottom: 0.5px solid var(--oxidized-copper);
    padding-top: 1.6rem;
    padding-bottom: 1.6rem;
}

.catalog-card {
    flex: 0 0 auto;
    width: 240px;
    padding: 1.2rem 1.1rem 1.1rem;
    background: var(--linen);
    mix-blend-mode: multiply;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
    border: 0.5px solid rgba(122, 130, 117, 0.6);
    position: relative;
}

.catalog-card__id {
    font-weight: 600;
    font-size: 0.7rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--oxidized-copper);
    font-variant-numeric: tabular-nums;
}

.catalog-card__illu {
    width: 100%;
    height: auto;
    color: var(--ink);
}

.catalog-card__caption {
    font-style: italic;
    font-weight: 350;
    font-size: 0.92rem;
    line-height: 1.45;
    color: var(--graphite);
}

.catalog-card__date {
    font-weight: 600;
    font-size: 0.65rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--marginalia);
    margin-top: auto;
    padding-top: 0.5rem;
    border-top: 0.5px dotted rgba(90, 87, 79, 0.35);
}

/* -------- Methods -------- */
.methods {
    position: relative;
    padding-top: 6rem;
    padding-bottom: 6rem;
    padding-left: var(--spine-left);
    padding-right: var(--right-margin);
}

.methods__grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    column-gap: 1.6vw;
    row-gap: 3rem;
}

.method {
    grid-column: span 6;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
    max-width: 44ch;
}

.method:nth-child(1) { grid-column: 2 / span 5; }
.method:nth-child(2) { grid-column: 8 / span 5; transform: translateY(2.5rem); }
.method:nth-child(3) { grid-column: 3 / span 5; }
.method:nth-child(4) { grid-column: 9 / span 4; transform: translateY(1.5rem); }

.method__numeral {
    font-style: italic;
    font-weight: 350;
    font-size: 1.1rem;
    color: var(--faded-rose);
    letter-spacing: 0.02em;
}

.method__title {
    font-weight: 400;
    font-style: italic;
    font-size: 1.5rem;
    line-height: 1.25;
    color: var(--ink);
    letter-spacing: -0.005em;
}

.method__body {
    color: var(--graphite);
    font-size: 1rem;
    line-height: 1.65;
}

/* -------- Pull quote -------- */
.pull {
    padding-block: 8rem;
    padding-left: var(--spine-left);
    padding-right: var(--right-margin);
}

.pull__quote {
    grid-column: 3 / span 8;
    max-width: 28ch;
    margin-left: 16%;
    font-style: italic;
    font-weight: 200;
    font-size: clamp(2rem, 4.5vw, 3.6rem);
    line-height: 1.18;
    color: var(--ink);
    letter-spacing: -0.012em;
    position: relative;
}

.pull__quote::before {
    content: "“";
    position: absolute;
    left: -0.7em;
    top: -0.05em;
    font-size: 1.4em;
    color: var(--faded-rose);
    font-weight: 200;
    font-style: italic;
}

.pull__attrib {
    margin-top: 1.6rem;
    font-style: italic;
    font-weight: 350;
    font-size: 0.85rem;
    color: var(--marginalia);
    letter-spacing: 0.04em;
}

/* -------- About -------- */
.about {
    position: relative;
    padding-top: 5rem;
    padding-bottom: 6rem;
    padding-left: var(--spine-left);
    padding-right: var(--right-margin);
}

.about__grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    column-gap: 1.6vw;
    row-gap: 2rem;
}

.about__photo {
    grid-column: 2 / span 5;
    transform: translateY(2rem);
}

.vignette {
    width: 100%;
    height: auto;
}

.about__prose {
    grid-column: 8 / span 4;
    display: flex;
    flex-direction: column;
    gap: 1.4rem;
}

.about__prose .prose {
    max-width: 32ch;
}

.about__meta {
    margin-top: 2rem;
    display: grid;
    grid-template-columns: max-content 1fr;
    column-gap: 1.4rem;
    row-gap: 0.6rem;
    border-top: 0.5px solid rgba(90, 87, 79, 0.25);
    padding-top: 1.4rem;
    max-width: 32ch;
}

.about__meta dt {
    font-weight: 600;
    font-size: 0.65rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--marginalia);
    align-self: baseline;
}

.about__meta dd {
    font-size: 0.9rem;
    color: var(--graphite);
    font-style: italic;
    font-weight: 350;
}

/* -------- Colophon -------- */
.colophon {
    border-top: 0.5px solid rgba(90, 87, 79, 0.25);
    padding-top: 3rem;
    padding-bottom: 3rem;
    padding-left: var(--spine-left);
    padding-right: var(--right-margin);
    margin-top: 4rem;
}

.colophon__grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    column-gap: 2.4rem;
    align-items: start;
}

.colophon__label {
    display: block;
    font-weight: 600;
    font-size: 0.65rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: var(--marginalia);
    margin-bottom: 0.6rem;
}

.colophon__body {
    font-style: italic;
    font-weight: 350;
    font-size: 0.85rem;
    color: var(--graphite);
    line-height: 1.55;
    max-width: 32ch;
}

.colophon__center {
    text-align: center;
}

.colophon__mark {
    font-style: italic;
    font-weight: 200;
    font-size: 1.6rem;
    color: var(--ink);
    letter-spacing: 0.08em;
}

.colophon__right {
    text-align: right;
}

.colophon__right .colophon__body {
    margin-left: auto;
}

/* -------- Links -------- */
a {
    color: var(--graphite);
    text-decoration: underline;
    text-decoration-color: rgba(90, 87, 79, 0.4);
    text-underline-offset: 2px;
    transition:
        color 200ms var(--ease-soft),
        text-decoration-color 200ms var(--ease-soft),
        text-underline-offset 200ms var(--ease-soft);
}

a:hover {
    color: var(--oxidized-copper);
    text-decoration-color: var(--oxidized-copper);
    text-underline-offset: 2.5px;
}

/* -------- Responsive: collapse off-axis layout under 880px -------- */
@media (max-width: 880px) {
    :root {
        --spine-left: 6%;
        --right-margin: 6%;
    }

    .threshold__grid,
    .listening__grid,
    .methods__grid,
    .about__grid {
        grid-template-columns: repeat(6, 1fr);
    }

    .threshold__mark {
        grid-column: 1 / -1;
    }

    .threshold__subtitle {
        grid-column: 1 / -1;
    }

    .threshold__illustration {
        grid-column: 4 / span 3;
        grid-row: auto;
        max-width: 200px;
    }

    .threshold__epigraph,
    .threshold__readout {
        grid-column: 1 / -1;
    }

    .spine-labels {
        grid-column: 1 / -1;
        writing-mode: horizontal-tb;
        transform: none;
        flex-direction: row;
        flex-wrap: wrap;
        gap: 1rem;
    }

    .listening__prose,
    .listening__diagrams {
        grid-column: 1 / -1;
    }

    .marginalia {
        position: static;
        width: auto;
        max-width: 52ch;
        margin-top: -0.4rem;
        margin-bottom: 1rem;
        padding-left: 1.4rem;
        border-left: 1px solid rgba(139, 132, 120, 0.35);
    }

    .marginalia-lines {
        display: none;
    }

    .method,
    .method:nth-child(n) {
        grid-column: 1 / -1;
        transform: none;
    }

    .pull__quote {
        grid-column: 1 / -1;
        margin-left: 0;
    }

    .about__photo,
    .about__prose {
        grid-column: 1 / -1;
        transform: none;
    }

    .colophon__grid {
        grid-template-columns: 1fr;
        row-gap: 1.6rem;
    }

    .colophon__right,
    .colophon__center {
        text-align: left;
    }

    .colophon__right .colophon__body {
        margin-left: 0;
    }
}

/* -------- Reduced motion -------- */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    [data-reveal] {
        transition: opacity 200ms linear;
        filter: none;
    }

    [data-reveal].is-revealed {
        filter: none;
    }

    .catalog__strip {
        transform: none !important;
    }

    .illustration,
    .vignette,
    .catalog-card__illu {
        filter: none !important;
    }
}