:root {
    --bg-primary: #FAF6F0;
    --bg-deep: #2C2419;
    --text-primary: #2C2419;
    --text-on-dark: #F0E8D8;
    --accent-gold: #C4A265;
    --accent-terracotta: #B8694A;
    --grid-lines: #D4C9B5;
    --mesh-highlight: #E8C87A;
    --meta-color: #9B8B6E;

    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Source Serif 4', 'Source Serif Pro', Georgia, serif;
    --font-mono: 'DM Mono', 'Courier New', monospace;

    --margin-width: 16.67%;

    --ease-elastic-in: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-elastic-out: cubic-bezier(0.22, 1.0, 0.36, 1);
    --ease-smooth: cubic-bezier(0.23, 1, 0.32, 1);
}

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

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

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.72;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   RULING MARGIN
   ============================================ */
.ruling-margin {
    position: fixed;
    top: 0;
    bottom: 0;
    left: var(--margin-width);
    width: 1px;
    z-index: 100;
    pointer-events: none;
}

.ruling-margin__line {
    width: 100%;
    height: 100%;
    background: var(--accent-gold);
    opacity: 0.3;
}

/* ============================================
   GRID OVERLAY
   ============================================ */
.grid-overlay {
    position: fixed;
    inset: 0;
    z-index: 50;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.grid-overlay.is-active {
    opacity: 1;
}

.grid-overlay__v-line {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--grid-lines);
    opacity: 0.25;
    transform: scaleY(0);
    transition: transform 0.6s var(--ease-elastic-in);
}

.grid-overlay__v-line.is-drawn {
    transform: scaleY(1);
}

.grid-overlay__diamond {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--accent-gold);
    transform: rotate(45deg) scale(0);
    transition: transform 0.4s var(--ease-elastic-in);
}

.grid-overlay__diamond.is-shown {
    transform: rotate(45deg) scale(1);
}

.grid-overlay__diamond:hover {
    transform: rotate(45deg) scale(2);
    transition: transform 0.35s var(--ease-elastic-in);
}

/* ============================================
   EDITORIAL CONTAINER
   ============================================ */
.editorial {
    position: relative;
}

/* ============================================
   PANELS - BASE
   ============================================ */
.panel {
    min-height: 90vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.panel--hero {
    min-height: 100vh;
    justify-content: flex-start;
    align-items: flex-end;
}

.panel--visual {
    min-height: 90vh;
    justify-content: flex-start;
    align-items: flex-end;
}

.panel--dark {
    background: var(--bg-deep);
}

.panel--colophon {
    min-height: 70vh;
    justify-content: center;
    align-items: center;
}

.panel--specimens {
    min-height: auto;
    padding: 0 0 89px 0;
}

/* ============================================
   PANEL CONTENT
   ============================================ */
.panel__content {
    position: relative;
    z-index: 5;
}

.panel__content--hero {
    margin-left: calc(var(--margin-width) + 3rem);
    padding: 0 3rem 12vh 0;
    max-width: 70%;
}

.panel__content--offset {
    margin-left: calc(var(--margin-width) + 4rem);
    padding: 6rem 3rem;
    max-width: 38em;
}

.panel__content--wide {
    margin-left: calc(var(--margin-width) + 4rem);
    padding: 0 3rem;
    max-width: 52em;
}

.panel__content--margin-note {
    position: absolute;
    left: 0;
    bottom: 3rem;
    width: calc(var(--margin-width) - 1rem);
    padding: 0 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 5;
}

.panel__content--colophon {
    text-align: center;
    padding: 4rem 3rem;
}

/* ============================================
   MARGIN MARKERS
   ============================================ */
.margin-marker {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: calc(var(--margin-width));
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.margin-marker__number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 2.8rem;
    height: 2.8rem;
    border: 1px solid var(--grid-lines);
    border-radius: 50%;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--meta-color);
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.8s ease, transform 0.8s var(--ease-elastic-in);
}

.panel.is-visible .margin-marker__number {
    opacity: 1;
    transform: scale(1);
}

.margin-marker--light .margin-marker__number {
    color: var(--text-on-dark);
    border-color: rgba(240, 232, 216, 0.2);
}

/* ============================================
   MARGIN NOTES
   ============================================ */
.margin-note {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-on-dark);
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.6s ease, transform 0.6s var(--ease-elastic-in);
}

.panel.is-visible .margin-note {
    opacity: 0.5;
    transform: translateY(0);
}

.panel.is-visible .margin-note:nth-child(2) {
    transition-delay: 0.15s;
}

.panel.is-visible .margin-note:nth-child(3) {
    transition-delay: 0.3s;
}

/* ============================================
   HERO
   ============================================ */
.hero-wordmark {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(5rem, 14vw, 12rem);
    letter-spacing: -0.02em;
    line-height: 1.05;
    color: var(--text-primary);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1.2s ease, transform 1.2s var(--ease-elastic-out);
}

body.loaded .hero-wordmark {
    opacity: 1;
    transform: translateY(0);
}

.hero-wordmark__dot {
    color: var(--accent-terracotta);
}

/* ============================================
   GRADIENT MESH COMPOSITIONS
   ============================================ */
.gradient-mesh {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
}

.gradient-mesh__layer {
    position: absolute;
    inset: 0;
    will-change: transform;
}

/* Hero Mesh - tungsten lamplight on archival paper */
.gradient-mesh__layer--1 {
    background: radial-gradient(ellipse 80% 60% at 75% 35%, rgba(196, 162, 101, 0.18) 0%, transparent 70%);
    mix-blend-mode: multiply;
}

.gradient-mesh__layer--2 {
    background: radial-gradient(ellipse 60% 80% at 25% 70%, rgba(232, 200, 122, 0.12) 0%, transparent 65%);
    mix-blend-mode: soft-light;
}

.gradient-mesh__layer--3 {
    background: conic-gradient(from 200deg at 60% 50%, transparent 0deg, rgba(184, 105, 74, 0.06) 90deg, transparent 180deg, rgba(196, 162, 101, 0.04) 270deg, transparent 360deg);
    mix-blend-mode: multiply;
}

.gradient-mesh__layer--4 {
    background: radial-gradient(ellipse 40% 40% at 85% 20%, rgba(232, 200, 122, 0.1) 0%, transparent 60%);
    mix-blend-mode: soft-light;
    opacity: 0;
    transform: scale(1.05);
    transition: opacity 3s ease, transform 3s ease;
}

body.loaded .gradient-mesh--hero .gradient-mesh__layer--4 {
    opacity: 1;
    transform: scale(1);
}

/* Warm Mesh - tungsten on walnut surfaces */
.gradient-mesh__layer--warm-1 {
    background: radial-gradient(ellipse 70% 50% at 60% 40%, rgba(196, 162, 101, 0.35) 0%, rgba(44, 36, 25, 0.9) 80%);
    mix-blend-mode: multiply;
}

.gradient-mesh__layer--warm-2 {
    background: radial-gradient(ellipse 50% 70% at 30% 60%, rgba(232, 200, 122, 0.2) 0%, transparent 70%);
    mix-blend-mode: soft-light;
}

.gradient-mesh__layer--warm-3 {
    background: conic-gradient(from 120deg at 70% 30%, transparent 0deg, rgba(184, 105, 74, 0.15) 120deg, transparent 240deg, rgba(232, 200, 122, 0.08) 300deg, transparent 360deg);
    mix-blend-mode: soft-light;
}

.gradient-mesh__layer--warm-4 {
    background: radial-gradient(ellipse 35% 45% at 50% 50%, rgba(250, 246, 240, 0.06) 0%, transparent 60%);
    mix-blend-mode: screen;
}

/* Copper Mesh - gold-leaf under oblique light */
.gradient-mesh__layer--copper-1 {
    background: radial-gradient(ellipse 60% 70% at 40% 50%, rgba(232, 200, 122, 0.3) 0%, rgba(44, 36, 25, 0.95) 75%);
    mix-blend-mode: multiply;
}

.gradient-mesh__layer--copper-2 {
    background: radial-gradient(ellipse 45% 55% at 65% 35%, rgba(196, 162, 101, 0.2) 0%, transparent 65%);
    mix-blend-mode: soft-light;
}

.gradient-mesh__layer--copper-3 {
    background: conic-gradient(from 45deg at 55% 60%, transparent 0deg, rgba(184, 105, 74, 0.12) 90deg, transparent 180deg, rgba(232, 200, 122, 0.1) 300deg, transparent 360deg);
    mix-blend-mode: soft-light;
}

.gradient-mesh__layer--copper-4 {
    background: radial-gradient(ellipse 30% 30% at 70% 25%, rgba(250, 246, 240, 0.05) 0%, transparent 50%);
    mix-blend-mode: screen;
}

/* Mesh enter animation */
.gradient-mesh {
    transform: scale(0.96);
    transition: transform 1s var(--ease-elastic-in);
}

.panel.is-visible .gradient-mesh {
    transform: scale(1);
}

body.loaded .gradient-mesh--hero {
    transform: scale(1);
}

/* ============================================
   TYPOGRAPHY - TITLES
   ============================================ */
.panel__title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.4rem, 5vw, 4.8rem);
    letter-spacing: -0.02em;
    line-height: 1.05;
    color: var(--text-primary);
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease 0.1s, transform 0.8s var(--ease-elastic-in) 0.1s;
}

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

/* ============================================
   TYPOGRAPHY - BODY
   ============================================ */
.panel__body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.4vw, 1.2rem);
    line-height: 1.72;
    letter-spacing: 0.005em;
    color: var(--text-primary);
    max-width: 38em;
    margin-bottom: 2.5rem;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease 0.2s, transform 0.8s var(--ease-elastic-in) 0.2s;
}

.panel.is-visible .panel__body {
    opacity: 0.85;
    transform: translateY(0);
}

/* ============================================
   PULL QUOTES
   ============================================ */
.pull-quote {
    position: relative;
    padding-left: 2rem;
    margin-top: 3rem;
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease 0.3s, transform 0.8s var(--ease-elastic-in) 0.3s;
}

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

.pull-quote__rule {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--accent-gold);
    transform-origin: top;
    transform: scaleY(0);
    transition: transform 0.7s var(--ease-elastic-in) 0.4s;
}

.panel.is-visible .pull-quote__rule {
    transform: scaleY(1);
}

.pull-quote__text {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1.8rem, 3.5vw, 3rem);
    line-height: 1.4;
    color: var(--accent-gold);
}

/* ============================================
   INTERSTITIALS
   ============================================ */
.interstitial {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 0;
    gap: 0;
    position: relative;
}

.interstitial__h-rule {
    width: 0;
    height: 1px;
    background: var(--grid-lines);
    opacity: 0.4;
    transition: width 0.6s var(--ease-elastic-in);
    flex-shrink: 1;
}

.interstitial.is-visible .interstitial__h-rule {
    width: 120px;
}

.interstitial__diamond {
    width: 6px;
    height: 6px;
    background: var(--accent-gold);
    transform: rotate(45deg) scale(0);
    transition: transform 0.4s var(--ease-elastic-in) 0.3s;
    flex-shrink: 0;
    margin: 0 12px;
}

.interstitial.is-visible .interstitial__diamond {
    transform: rotate(45deg) scale(1);
}

/* ============================================
   SPECIMEN GRID
   ============================================ */
.specimen-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1px solid rgba(196, 162, 101, 0.2);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease 0.2s, transform 0.8s var(--ease-elastic-in) 0.2s;
}

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

.specimen {
    padding: 2.5rem;
    border-right: 1px solid rgba(196, 162, 101, 0.15);
    border-bottom: 1px solid rgba(196, 162, 101, 0.15);
    transition: background 0.4s ease;
}

.specimen:nth-child(2n) {
    border-right: none;
}

.specimen:nth-child(n+3) {
    border-bottom: none;
}

.specimen:hover {
    background: rgba(196, 162, 101, 0.05);
}

.specimen__category {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent-terracotta);
    margin-bottom: 0.8rem;
}

.specimen__title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.3rem;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 0.7rem;
}

.specimen__desc {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 0.9rem;
    line-height: 1.72;
    color: var(--meta-color);
    margin-bottom: 1.2rem;
}

.specimen__ref {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--grid-lines);
}

/* ============================================
   METHOD LIST
   ============================================ */
.method-list {
    margin-top: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease 0.3s, transform 0.8s var(--ease-elastic-in) 0.3s;
}

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

.method-item {
    display: flex;
    gap: 1.2rem;
    padding: 0.85rem 0;
    border-bottom: 1px solid rgba(196, 162, 101, 0.1);
    align-items: baseline;
}

.method-item:last-child {
    border-bottom: none;
}

.method-item__num {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: 1rem;
    color: var(--accent-gold);
    min-width: 2rem;
    flex-shrink: 0;
}

.method-item__label {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 1rem;
    line-height: 1.72;
    color: var(--text-primary);
    opacity: 0.75;
}

/* ============================================
   COLOPHON
   ============================================ */
.colophon {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2.5rem;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease 0.2s, transform 0.8s var(--ease-elastic-in) 0.2s;
}

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

.colophon__mark {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 1s ease 0.4s, transform 1s var(--ease-elastic-in) 0.4s;
}

.panel.is-visible .colophon__mark {
    opacity: 1;
    transform: scale(1);
}

.colophon__mark-shape {
    position: relative;
    width: 48px;
    height: 48px;
}

.colophon__rect {
    position: absolute;
    border: 1px solid var(--accent-gold);
    opacity: 0.4;
}

.colophon__rect--1 {
    width: 32px;
    height: 40px;
    top: 4px;
    left: 4px;
}

.colophon__rect--2 {
    width: 28px;
    height: 36px;
    top: 8px;
    left: 12px;
}

.colophon__rect--3 {
    width: 24px;
    height: 32px;
    top: 12px;
    left: 20px;
}

.colophon__meta {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    align-items: center;
}

.colophon__line {
    display: flex;
    gap: 1rem;
    align-items: baseline;
}

.colophon__label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--meta-color);
}

.colophon__value {
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--text-primary);
    opacity: 0.7;
}

.colophon__wordmark {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.8rem;
    letter-spacing: -0.02em;
    color: var(--grid-lines);
    margin-top: 1rem;
}

/* ============================================
   RESPONSIVE - TABLET
   ============================================ */
@media (max-width: 768px) {
    :root {
        --margin-width: 0%;
    }

    .ruling-margin {
        display: none;
    }

    .margin-marker {
        display: none;
    }

    .panel__content--hero {
        margin-left: 2rem;
        padding: 0 2rem 10vh 0;
        max-width: 90%;
    }

    .panel__content--offset {
        margin-left: 0;
        padding: 4rem 2rem;
    }

    .panel__content--wide {
        margin-left: 0;
        padding: 0 2rem;
    }

    .panel__content--margin-note {
        position: absolute;
        left: auto;
        right: 2rem;
        bottom: 2rem;
        width: auto;
        padding: 0;
        align-items: flex-end;
    }

    .specimen-grid {
        grid-template-columns: 1fr;
    }

    .specimen {
        border-right: none;
        border-bottom: 1px solid rgba(196, 162, 101, 0.15);
    }

    .specimen:last-child {
        border-bottom: none;
    }

    .hero-wordmark {
        font-size: clamp(3.5rem, 12vw, 7rem);
    }

    .interstitial__h-rule {
        max-width: 80px;
    }

    /* Simplify gradient meshes to 2-layer */
    .gradient-mesh__layer--3,
    .gradient-mesh__layer--4,
    .gradient-mesh__layer--warm-3,
    .gradient-mesh__layer--warm-4,
    .gradient-mesh__layer--copper-3,
    .gradient-mesh__layer--copper-4 {
        display: none;
    }
}

/* ============================================
   RESPONSIVE - MOBILE
   ============================================ */
@media (max-width: 480px) {
    .panel__content--hero {
        margin-left: 1.2rem;
        padding: 0 1.2rem 8vh 0;
    }

    .panel__content--offset {
        padding: 3rem 1.2rem;
    }

    .panel__content--wide {
        padding: 0 1.2rem;
    }

    .panel__title {
        font-size: clamp(1.8rem, 7vw, 3rem);
    }

    .pull-quote__text {
        font-size: clamp(1.3rem, 4vw, 2rem);
    }

    .specimen {
        padding: 1.8rem;
    }

    .colophon__line {
        flex-direction: column;
        gap: 0.2rem;
        align-items: center;
    }
}