:root {
    /* Palette - Coastal Blend */
    --bg-primary: #f5f0e8;
    --bg-secondary: #ede7db;
    --text-primary: #2c3e4a;
    --text-secondary: #4a5c66;
    --text-tertiary: #7b8f99;
    --accent-primary: #7ba7a7;
    --accent-secondary: #c9948a;
    --accent-tertiary: #8a7a60;
    --highlight: #d4e8e4;
    --cartouche-border: #3a3a38;

    /* Shadow system - Inflated 3D */
    --shadow-level-1: 0 2px 6px rgba(42, 62, 74, 0.06);
    --shadow-level-2: 0 4px 12px rgba(42, 62, 74, 0.08), 0 1px 3px rgba(42, 62, 74, 0.04);
    --shadow-level-3: 0 8px 24px rgba(42, 62, 74, 0.10), 0 2px 6px rgba(42, 62, 74, 0.06);

    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'DM Sans', system-ui, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Spread System --- */
.spread {
    padding: 0 8vw;
}

.spread-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.spread + .spread {
    margin-top: 6rem;
}

/* --- Grid Layouts --- */
.spread-grid {
    display: grid;
    gap: 4rem;
    align-items: start;
}

.grid-60-40 {
    grid-template-columns: 3fr 2fr;
}

.grid-40-60 {
    grid-template-columns: 2fr 3fr;
}

/* --- Cartouche (Framing Device) --- */
.cartouche {
    border: 2px solid var(--cartouche-border);
    border-radius: 4px;
    padding: 2rem 3rem;
    text-align: center;
    position: relative;
    background: var(--bg-primary);
    box-shadow: var(--shadow-level-2);
}

.cartouche::before {
    content: '';
    position: absolute;
    inset: 5px;
    border: 1px solid var(--accent-primary);
    border-radius: 3px;
    pointer-events: none;
}

.cartouche-label {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent-primary);
    display: block;
    margin-bottom: 0.75rem;
}

/* --- Spread 1: Title Cartouche --- */
.spread-1 {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 4rem;
    padding-bottom: 4rem;
}

.spread-1 .spread-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3rem;
}

.cartouche-title {
    max-width: 640px;
    box-shadow: var(--shadow-level-3);
}

.title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 0.5rem;
}

.subtitle {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: 0.9rem;
    color: var(--text-tertiary);
    letter-spacing: 0.02em;
}

.coastline-hero {
    width: 100%;
    max-width: 700px;
}

.contour-hero {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 2px 4px rgba(42, 62, 74, 0.12));
}

.contour-line {
    animation: contour-breathe 8s ease-in-out infinite;
    transform-origin: center center;
}

.contour-outer-2 { animation-delay: -2s; }
.contour-outer-3 { animation-delay: -4s; }
.contour-inner { animation-delay: -6s; }

@keyframes contour-breathe {
    0%, 100% { transform: scaleY(1); }
    50% { transform: scaleY(1.005); }
}

/* --- Spread 2: The Survey --- */
.spread-2 {
    padding-top: 2rem;
}

.contour-map {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 2px 4px rgba(42, 62, 74, 0.12));
}

.contour-ring {
    animation: contour-breathe 8s ease-in-out infinite;
    transform-origin: center center;
}

.contour-ring:nth-child(2) { animation-delay: -1.5s; }
.contour-ring:nth-child(3) { animation-delay: -3s; }
.contour-ring:nth-child(4) { animation-delay: -4.5s; }

.cartouche-section {
    margin-bottom: 2rem;
    padding: 1.5rem 2rem;
}

.micro-label {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent-primary);
    display: block;
    margin-bottom: 0.5rem;
}

.spread-headline {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.15;
}

.body-text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    color: var(--text-secondary);
    line-height: 1.7;
    letter-spacing: 0.01em;
    margin-bottom: 1.5rem;
}

.pull-quote {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(1.1rem, 1.8vw, 1.4rem);
    color: var(--text-primary);
    line-height: 1.5;
    padding: 1.5rem 0;
    margin: 1.5rem 0;
    border-top: 1px solid var(--accent-primary);
    border-bottom: 1px solid var(--accent-primary);
}

.vintage-mark {
    display: block;
    margin-top: 2rem;
    opacity: 0.7;
}

/* --- Spread 3: The Ledger --- */
.spread-3 {
    padding-top: 2rem;
}

.ledger-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.ledger-card {
    perspective: 800px;
    height: 80px;
}

.card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 600ms ease-in-out;
    transform-style: preserve-3d;
}

.ledger-card:hover .card-inner {
    transform: rotateY(180deg);
}

.card-front,
.card-back {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--accent-primary);
    border-radius: 6px;
    box-shadow: var(--shadow-level-2);
    gap: 1rem;
}

.card-back {
    transform: rotateY(180deg);
    background: var(--bg-secondary);
    overflow: hidden;
}

.card-contour-bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0.6;
}

.card-icon {
    flex-shrink: 0;
}

.card-label {
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.85rem;
    color: var(--text-primary);
    letter-spacing: 0.01em;
}

.card-desc {
    position: relative;
    z-index: 1;
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
    padding-left: 0.5rem;
}

/* Compass Rose */
.compass-rose {
    width: 100%;
    max-width: 400px;
    height: auto;
    margin: 0 auto;
    display: block;
    animation: compass-rotate 120s linear infinite;
    filter: drop-shadow(0 4px 12px rgba(42, 62, 74, 0.08));
}

@keyframes compass-rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.vintage-mark-anchor {
    display: block;
    margin: 2rem auto 0;
    opacity: 0.7;
}

/* --- Spread 4: The Datum Line --- */
.spread-4 {
    padding-top: 2rem;
    padding-bottom: 2rem;
}

.coastline-divider {
    width: 100%;
    height: 60px;
}

.coastline-path {
    stroke-dasharray: 2500;
    stroke-dashoffset: 2500;
    transition: stroke-dashoffset 3s ease-in-out;
}

.coastline-path.drawn {
    stroke-dashoffset: 0;
}

.datum-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.75rem;
}

/* --- Spread 5: Closing Chart --- */
.spread-5 {
    padding-top: 2rem;
    padding-bottom: 6rem;
}

.spread-closing-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 2.5rem;
}

.cartouche-closing {
    max-width: 480px;
    box-shadow: var(--shadow-level-3);
}

.closing-domain {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 0.25rem;
}

.closing-tagline {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.closing-icons {
    display: flex;
    gap: 4rem;
    align-items: center;
}

.closing-icon {
    opacity: 0.65;
    transition: opacity 400ms ease;
}

.closing-icon:hover {
    opacity: 1;
}

.vintage-mark-bottom {
    opacity: 0.5;
}

/* --- Responsive: Single Column below 768px --- */
@media (max-width: 768px) {
    .spread {
        padding: 0 5vw;
    }

    .spread + .spread {
        margin-top: 4rem;
    }

    .grid-60-40,
    .grid-40-60 {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .spread-1 {
        min-height: auto;
        padding-top: 3rem;
        padding-bottom: 3rem;
    }

    .cartouche {
        padding: 1.5rem 1.5rem;
    }

    .contour-map {
        max-width: 400px;
        margin: 0 auto;
        display: block;
    }

    .compass-rose {
        max-width: 280px;
    }

    .closing-icons {
        gap: 2rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .ledger-card {
        height: 90px;
    }

    .datum-labels {
        flex-direction: column;
        align-items: center;
        gap: 0.25rem;
    }

    /* On mobile, reorder grid-40-60 so ledger comes first */
    .grid-40-60 .spread-left {
        order: 1;
    }
    .grid-40-60 .spread-right {
        order: 2;
    }
}