/* ===========================================================
   gabs.cx — The Architecture of Dialogue
   Palette: Warm Earthy
   Layout: F-pattern, 12-col, 1440 max
   =========================================================== */

:root {
    --bg: #FAF5EF;            /* Parchment Cream */
    --text: #3B2820;          /* Espresso Umber */
    --warm: #D4A27A;          /* Desert Sandstone */
    --deep: #A0522D;          /* Sienna */
    --watermark: #8B4513;     /* Saddlebrown */
    --hover: #F0E6D8;         /* Warm Bisque */
    --border: #C4956A;        /* Adobe Clay */
    --dark: #2C1E14;          /* Burnt Bark */

    --font-display: 'Josefin Sans', 'Inter', sans-serif;
    --font-body: 'Nunito Sans', 'Inter', sans-serif;
    --font-mono: 'Space Mono', 'Space', monospace;

    --max-w: 1440px;
    --gutter: clamp(24px, 4vw, 72px);
    --col-gap: 24px;

    --ease-soft: cubic-bezier(0.33, 1, 0.68, 1);
    --ease-scale: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: clamp(1rem, 1.8vw, 1.15rem);
    font-weight: 400;
    line-height: 1.75;
    letter-spacing: 0.01em;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ============== PROGRESS RAIL (left edge) ============== */
.progress-rail {
    position: fixed;
    top: 0;
    left: 0;
    width: 2px;
    height: 100vh;
    background: rgba(160, 82, 45, 0.08);
    z-index: 50;
}

.progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--deep);
    opacity: 0.6;
    transform-origin: top center;
    transform: scaleY(0);
    will-change: transform;
}

/* ============== PROGRESS READOUT (top right) ============== */
.progress-readout {
    position: fixed;
    top: clamp(20px, 3vh, 40px);
    right: clamp(20px, 4vw, 60px);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--deep);
    opacity: 0.5;
    z-index: 60;
    user-select: none;
}

/* ============== PAGE GRID ============== */
.page-grid {
    max-width: var(--max-w);
    margin: 0 auto;
    padding-left: var(--gutter);
    padding-right: var(--gutter);
    position: relative;
}

/* ============== ZONES (shared) ============== */
.zone {
    position: relative;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--col-gap);
    padding-top: 12vh;
    padding-bottom: 12vh;
}

.zone-inner {
    position: relative;
    z-index: 2;
}

.zone-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--deep);
    opacity: 0.5;
    margin-bottom: clamp(20px, 3vh, 36px);
}

.section-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(1.6rem, 3.5vw, 2.8rem);
    line-height: 1.2;
    letter-spacing: 0.04em;
    color: var(--text);
    margin-bottom: clamp(24px, 4vh, 48px);
}

/* ============== ZONE 1: HERO ============== */
.zone-hero {
    min-height: 100vh;
    align-items: center;
    padding-top: 0;
    padding-bottom: 0;
}

.zone-hero .zone-inner {
    grid-column: 1 / span 7;
}

.hero-statement {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.8rem, 7vw, 5.5rem);
    line-height: 1.05;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text);
    margin-bottom: clamp(28px, 4vh, 52px);
}

.hero-rule {
    width: 100%;
    height: 1px;
    background: var(--border);
    margin-bottom: clamp(24px, 3vh, 40px);
    transform-origin: left center;
    transform: scaleX(0);
    transition: transform 0.9s var(--ease-soft) 0.2s;
}

.reveal.is-visible .hero-rule,
.hero-rule.is-visible {
    transform: scaleX(1);
}

.hero-sub {
    max-width: 520px;
    color: var(--text);
    opacity: 0.78;
}

.hero-slash {
    grid-column: 9 / span 4;
    align-self: center;
    justify-self: end;
    width: 220px;
    height: 280px;
    pointer-events: none;
}

.scroll-cue {
    position: absolute;
    bottom: clamp(24px, 5vh, 48px);
    left: var(--gutter);
    display: flex;
    align-items: center;
    gap: 14px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--deep);
    opacity: 0.5;
}

.scroll-cue-line {
    width: 60px;
    height: 1px;
    background: var(--deep);
    opacity: 0.6;
    animation: cueSlide 2.4s var(--ease-soft) infinite;
    transform-origin: left center;
}

@keyframes cueSlide {
    0%, 100% { transform: scaleX(0.4); opacity: 0.2; }
    50% { transform: scaleX(1); opacity: 0.7; }
}

/* ============== CHEVRON DIVIDER (between zones) ============== */
.chevron-divider {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--col-gap);
    padding: 4vh 0;
}

.chevron {
    grid-column: 10 / span 2;
    width: 80px;
    height: 80px;
    position: relative;
    justify-self: center;
    transform: rotate(0deg);
    transition: transform 0.6s var(--ease-soft);
}

.chevron::before,
.chevron::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 60px;
    height: 1.5px;
    background: var(--warm);
    opacity: 0.3;
    transform-origin: left center;
}

.chevron::before {
    transform: translate(-50%, -50%) rotate(21deg);
}

.chevron::after {
    transform: translate(-50%, -50%) rotate(-21deg) translateX(0);
}

/* rotated state when scrolled into view */
.chevron-divider.is-visible .chevron {
    transform: rotate(5deg);
}

/* ============== ZONE 2: THESIS ============== */
.zone-thesis {
    min-height: 80vh;
    align-content: center;
}

.thesis-inner {
    grid-column: 2 / span 7;
    display: grid;
    grid-template-columns: 2fr 5fr;
    gap: var(--col-gap);
    align-items: start;
}

.thesis-aside {
    grid-column: 1 / span 1;
    position: sticky;
    top: 20vh;
}

.thesis-body {
    grid-column: 2 / span 1;
    display: flex;
    flex-direction: column;
    gap: clamp(20px, 3vh, 36px);
}

.thesis-body p {
    max-width: 56ch;
}

.emph {
    font-weight: 600;
    color: var(--deep);
    font-family: var(--font-display);
    font-size: 1.05em;
    letter-spacing: 0.02em;
}

.watermark {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-30%, -50%);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(8rem, 20vw, 16rem);
    line-height: 1;
    color: var(--watermark);
    opacity: 0.04;
    user-select: none;
    pointer-events: none;
    z-index: 1;
    letter-spacing: -0.02em;
}

/* ============== ZONES 3,4,5: STAGGERED ARGUMENTS ============== */
.zone-argument {
    min-height: 60vh;
    align-content: center;
}

.zone-left .block-inner {
    grid-column: 1 / span 6;
}

.zone-right .block-inner {
    grid-column: 3 / span 6;
}

.content-block {
    position: relative;
    padding: clamp(28px, 5vh, 56px) clamp(28px, 4vw, 56px);
    background: transparent;
    border-radius: 2px;
    transition: transform 0.35s var(--ease-scale), background 0.35s var(--ease-scale);
    cursor: default;
}

.content-block::before {
    content: "";
    position: absolute;
    top: -2px;
    left: -2px;
    width: 24px;
    height: 24px;
    border-left: 1.5px solid var(--border);
    border-top: 1.5px solid var(--border);
    opacity: 0.4;
    transition: opacity 0.35s var(--ease-scale);
}

.content-block::after {
    content: "";
    position: absolute;
    bottom: -2px;
    right: -2px;
    width: 24px;
    height: 24px;
    border-right: 1.5px solid var(--border);
    border-bottom: 1.5px solid var(--border);
    opacity: 0.4;
    transition: opacity 0.35s var(--ease-scale);
}

.content-block:hover {
    transform: scale(1.03);
    background: var(--hover);
}

.content-block:hover::before,
.content-block:hover::after {
    opacity: 0.8;
}

.content-block p + p {
    margin-top: clamp(16px, 2.4vh, 28px);
}

.content-block p {
    max-width: 60ch;
}

/* ============== ZONE 6: INVERSION ============== */
.zone-inversion {
    background: var(--dark);
    color: var(--bg);
    min-height: 100vh;
    align-content: center;
    margin-left: calc(var(--gutter) * -1);
    margin-right: calc(var(--gutter) * -1);
    padding-left: var(--gutter);
    padding-right: var(--gutter);
    margin-top: 8vh;
    position: relative;
    overflow: hidden;
}

.inversion-inner {
    grid-column: 1 / span 9;
    padding-left: var(--gutter);
}

.inversion-label {
    color: var(--warm);
    opacity: 0.6;
}

.closing-statement {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.2rem, 5.5vw, 4.4rem);
    line-height: 1.1;
    letter-spacing: 0.04em;
    color: var(--bg);
    margin-bottom: clamp(28px, 4vh, 52px);
    transition: transform 0.35s var(--ease-scale);
    cursor: default;
    display: inline-block;
}

.closing-statement:hover {
    transform: scale(1.03);
}

.closing-emph {
    color: var(--warm);
    font-style: normal;
    font-weight: 600;
}

.closing-rule {
    width: 240px;
    max-width: 60%;
    height: 1px;
    background: var(--warm);
    opacity: 0.5;
    margin-bottom: clamp(20px, 3vh, 32px);
    transform-origin: left center;
    transform: scaleX(0);
    transition: transform 1s var(--ease-soft) 0.2s;
}

.closing-rule.is-visible,
.reveal.is-visible .closing-rule {
    transform: scaleX(1);
}

.closing-sign {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--warm);
    opacity: 0.7;
}

.ghost-corner {
    position: absolute;
    width: 96px;
    height: 96px;
    pointer-events: none;
    opacity: 0.15;
}

.ghost-tl {
    top: 8vh;
    left: clamp(40px, 8vw, 120px);
    border-left: 1.5px solid var(--warm);
    border-top: 1.5px solid var(--warm);
}

.ghost-br {
    bottom: 8vh;
    right: clamp(40px, 8vw, 120px);
    border-right: 1.5px solid var(--warm);
    border-bottom: 1.5px solid var(--warm);
}

.ghost-chevron {
    position: absolute;
    top: 50%;
    right: clamp(40px, 10vw, 160px);
    transform: translateY(-50%);
    pointer-events: none;
}

.chevron-ghost::before,
.chevron-ghost::after {
    background: var(--warm);
    opacity: 0.15;
    width: 80px;
    height: 1.5px;
}

/* ============== REVEAL ANIMATIONS ============== */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s var(--ease-soft), transform 0.7s var(--ease-soft);
    will-change: opacity, transform;
}

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

/* staggered children */
.zone-inner .reveal:nth-child(2) { transition-delay: 0.12s; }
.zone-inner .reveal:nth-child(3) { transition-delay: 0.24s; }
.zone-inner .reveal:nth-child(4) { transition-delay: 0.36s; }
.zone-inner .reveal:nth-child(5) { transition-delay: 0.48s; }

.thesis-body .reveal:nth-child(1) { transition-delay: 0.0s; }
.thesis-body .reveal:nth-child(2) { transition-delay: 0.12s; }
.thesis-body .reveal:nth-child(3) { transition-delay: 0.24s; }

/* ============== RESPONSIVE ============== */
@media (max-width: 900px) {
    .zone-hero .zone-inner {
        grid-column: 1 / -1;
    }
    .hero-slash {
        display: none;
    }
    .thesis-inner {
        grid-column: 1 / -1;
        grid-template-columns: 1fr;
    }
    .thesis-aside {
        position: relative;
        top: 0;
    }
    .zone-left .block-inner,
    .zone-right .block-inner {
        grid-column: 1 / -1;
    }
    .inversion-inner {
        grid-column: 1 / -1;
        padding-left: 0;
    }
    .ghost-corner,
    .ghost-chevron {
        display: none;
    }
    .watermark {
        font-size: clamp(6rem, 30vw, 12rem);
    }
    .scroll-cue {
        display: none;
    }
}

@media (max-width: 560px) {
    :root {
        --gutter: 22px;
    }
    .progress-readout {
        font-size: 0.65rem;
    }
}