:root {
    --umber-black: #1A0F0A;
    --burnt-sienna: #D4763A;
    --warm-parchment: #F2E6D9;
    --dark-terracotta: #8C3A1F;
    --near-white: #F5F0EB;
    --dark-chocolate: #3D2B1F;
    --amber-gold: #E8A44A;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--umber-black);
    color: var(--warm-parchment);
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 400;
    font-size: clamp(16px, 1.2vw, 22px);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ============================================
   NAVIGATION INDICATOR
   ============================================ */

.nav-indicator {
    position: fixed;
    top: 1rem;
    left: 1.5rem;
    font-family: 'Space Mono', monospace;
    font-weight: 400;
    font-size: 11px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--burnt-sienna);
    z-index: 100;
    transition: opacity 0.3s ease;
}

/* ============================================
   GRID SYSTEM
   ============================================ */

.grid-12 {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ============================================
   MODE 1: BROADSHEET OPENING
   ============================================ */

.mode-1 {
    min-height: 100vh;
    background-color: var(--umber-black);
    padding: 4rem 0;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.mode1-content {
    grid-column: 2 / 9;
}

.mode1-margin {
    grid-column: 9 / 13;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: flex-end;
    padding-bottom: 2rem;
}

.vertical-rule {
    position: absolute;
    top: 0;
    left: 0;
    width: 1px;
    height: 100%;
    background-color: var(--burnt-sienna);
}

.date-stamp {
    font-family: 'Space Mono', monospace;
    font-size: 11px;
    letter-spacing: 0.08em;
    color: var(--burnt-sienna);
    transform: rotate(90deg);
    transform-origin: bottom right;
    white-space: nowrap;
    position: absolute;
    bottom: 2rem;
    right: 1rem;
}

.headline {
    font-family: 'Bebas Neue', sans-serif;
    font-weight: 400;
    font-size: clamp(48px, 8vw, 96px);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--warm-parchment);
    line-height: 1.05;
    margin-bottom: 2rem;
}

.body-dark {
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 400;
    font-size: clamp(16px, 1.2vw, 22px);
    line-height: 1.7;
    color: var(--dark-chocolate);
    margin-bottom: 1.25rem;
}

.body-light {
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 400;
    font-size: clamp(16px, 1.2vw, 22px);
    line-height: 1.7;
    color: var(--warm-parchment);
    margin-bottom: 1.25rem;
}

.mode-1 .body-dark {
    color: var(--warm-parchment);
}

.overprint-numeral {
    position: absolute;
    font-family: 'Bebas Neue', sans-serif;
    font-size: clamp(150px, 25vw, 400px);
    color: var(--dark-terracotta);
    opacity: 0.12;
    line-height: 1;
    pointer-events: none;
    bottom: -5%;
    left: -2%;
    overflow: hidden;
    z-index: 0;
}

.overprint-right {
    left: auto;
    right: -2%;
}

/* ============================================
   MODE 2: ANNOTATION CORRIDOR
   ============================================ */

.mode-2 {
    position: relative;
    padding: 4rem 0;
    overflow: hidden;
}

.section-dark {
    background-color: var(--umber-black);
}

.section-light {
    background-color: var(--near-white);
}

.section-light .body-dark {
    color: var(--dark-chocolate);
}

.crease-fold {
    width: 100%;
    height: 5px;
    background: linear-gradient(to bottom,
        rgba(0,0,0,0.15) 0%,
        rgba(0,0,0,0.05) 50%,
        rgba(0,0,0,0.1) 100%
    );
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.corridor {
    position: relative;
}

.annotation-col {
    grid-column: 1 / 4;
    padding-right: 1rem;
}

.gutter-fissure {
    grid-column: 4;
    position: relative;
}

.gutter-fissure::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 1px;
    height: 100%;
    background-color: var(--burnt-sienna);
    opacity: 0.4;
}

.main-col {
    grid-column: 5 / 13;
}

.annotation-block {
    margin-bottom: 1.5rem;
    padding: 0.5rem 0;
}

.annotation-marker {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
}

.annotation-marker::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--burnt-sienna);
    flex-shrink: 0;
}

.annotation-marker::after {
    content: '';
    display: inline-block;
    width: 40px;
    height: 1px;
    background-color: var(--burnt-sienna);
}

.anno-text {
    display: block;
    font-family: 'Space Mono', monospace;
    font-weight: 400;
    font-size: 11px;
    line-height: 1.5;
    color: var(--burnt-sienna);
    letter-spacing: 0.02em;
}

.section-light .anno-text {
    color: var(--dark-terracotta);
}

.sticky-note {
    position: sticky;
    top: 50vh;
}

.section-headline {
    font-family: 'Bebas Neue', sans-serif;
    font-weight: 400;
    font-size: clamp(48px, 7vw, 100px);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--warm-parchment);
    line-height: 1.05;
    margin-bottom: 1.5rem;
}

.headline-dark {
    color: var(--dark-chocolate);
}

/* ============================================
   HOVER-LIFT
   ============================================ */

.hover-lift {
    transition: transform 0.2s ease-out, border-left-color 0.2s ease-out;
    border-left: 3px solid transparent;
    padding-left: 0.75rem;
}

.hover-lift:hover {
    transform: translateY(-4px);
    border-left-color: var(--amber-gold);
}

/* ============================================
   MODE 3: THE RUPTURE
   ============================================ */

.mode-3 {
    position: relative;
    padding: 2rem 0;
    overflow: hidden;
}

.pullquote-block {
    width: 100%;
    padding: 3rem 1.5rem;
    text-align: center;
}

.pullquote {
    font-family: 'Bebas Neue', sans-serif;
    font-weight: 400;
    font-size: clamp(36px, 6vw, 80px);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--burnt-sienna);
    line-height: 1.1;
}

.section-light .pullquote {
    color: var(--dark-terracotta);
}

.rupture-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.rupture-text {
    grid-column: 1 / 10;
}

.rupture-annotation {
    grid-column: 10 / 13;
}

.hatching-block {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background-image: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 6px,
        rgba(140, 58, 31, 0.2) 6px,
        rgba(140, 58, 31, 0.2) 8px
    );
}

.hatching-text {
    font-family: 'Source Serif 4', Georgia, serif;
    font-weight: 600;
    font-size: clamp(16px, 1.2vw, 20px);
    line-height: 1.7;
    color: var(--dark-chocolate);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    .grid-12 {
        grid-template-columns: 1fr;
    }

    .mode1-content {
        grid-column: 1;
    }

    .mode1-margin {
        display: none;
    }

    .annotation-col {
        grid-column: 1;
        margin-bottom: 2rem;
    }

    .gutter-fissure {
        display: none;
    }

    .main-col {
        grid-column: 1;
    }

    .rupture-text {
        grid-column: 1;
    }

    .rupture-annotation {
        grid-column: 1;
    }

    .sticky-note {
        position: static;
    }

    .overprint-numeral {
        font-size: 100px;
    }
}