:root {
    --bg-deep: #0B0F1A;
    --bg-mid: #161B2E;
    --surface: #1E2438;
    --aged-gold: #C8A96E;
    --signal-white: #E8E4DC;
    --warm-ivory: #F0EDE5;
    --faded-silver: #8B8D97;
    --dawn-amber: #E8B84A;
    --bright-gold: #F5D36E;

    --font-display: 'Outfit', sans-serif;
    --font-body: 'Source Serif 4', serif;
    --font-mono: 'Azeret Mono', monospace;

    --ease-enter: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

body {
    background: var(--bg-deep);
    color: var(--warm-ivory);
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    line-height: 1.7;
    overflow-x: hidden;
    font-variant-ligatures: common-ligatures;
    font-feature-settings: "kern" 1;
}

.chapter {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

/* ===== Chapter 1: The Word ===== */
.chapter-word {
    background: var(--bg-deep);
}

.hero-word {
    display: inline-flex;
    gap: 0;
}

.morph-letter {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 10rem);
    text-transform: uppercase;
    letter-spacing: -0.02em;
    color: var(--warm-ivory);
    font-variation-settings: 'wght' 400;
    animation: morphWeight 8s ease-in-out infinite;
}

.morph-letter:nth-child(1) { animation-delay: 0s; }
.morph-letter:nth-child(2) { animation-delay: -1.6s; }
.morph-letter:nth-child(3) { animation-delay: -3.2s; }
.morph-letter:nth-child(4) { animation-delay: -4.8s; }
.morph-letter:nth-child(5) { animation-delay: -6.4s; }

@keyframes morphWeight {
    0%, 100% { font-variation-settings: 'wght' 100; letter-spacing: 0.05em; }
    50% { font-variation-settings: 'wght' 900; letter-spacing: -0.02em; }
}

.hero-subtitle {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 1.2rem;
    color: var(--faded-silver);
    margin-top: 1.5rem;
    min-height: 1.5em;
}

.hero-subtitle .typed-char {
    display: inline-block;
    opacity: 0;
    transform: translateY(8px);
    animation: bounceIn 400ms var(--ease-bounce) forwards;
}

@keyframes bounceIn {
    to { opacity: 1; transform: translateY(0); }
}

.scroll-invite {
    position: absolute;
    bottom: 2rem;
    width: 100%;
    display: flex;
    justify-content: center;
}

.scroll-gold-line {
    width: 0;
    height: 1px;
    background: var(--aged-gold);
    animation: lineExpand 3s ease-in-out infinite;
}

@keyframes lineExpand {
    0%, 100% { width: 0; opacity: 0.3; }
    50% { width: 120px; opacity: 1; }
}

/* ===== Chapter 2: The Breath ===== */
.chapter-breath {
    background: var(--bg-deep);
    padding: 4rem 5vw;
}

.heat-map {
    position: absolute;
    inset: 0;
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    grid-template-rows: repeat(12, 1fr);
    pointer-events: none;
    z-index: 0;
}

.heat-cell {
    background: var(--aged-gold);
    opacity: 0;
    animation: cellPulse 4s ease-in-out infinite;
}

@keyframes cellPulse {
    0%, 100% { opacity: 0.02; }
    50% { opacity: 0.12; }
}

.breath-text {
    position: relative;
    z-index: 1;
    max-width: 600px;
    text-align: center;
}

.breath-line {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(1.1rem, 1.8vw, 1.35rem);
    color: var(--warm-ivory);
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 700ms var(--ease-enter), transform 700ms var(--ease-enter);
}

.breath-line.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Chapter 3: The Structure ===== */
.chapter-structure {
    background: var(--bg-mid);
    padding: 4rem 5vw;
}

.spread-layout {
    display: flex;
    gap: 3rem;
    align-items: center;
    max-width: 1000px;
    width: 100%;
}

.spread-left {
    flex: 0 0 40%;
    position: relative;
}

.cycling-word {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: clamp(2.5rem, 6vw, 5rem);
    text-transform: uppercase;
    letter-spacing: -0.02em;
    color: var(--warm-ivory);
    transition: opacity 300ms var(--ease-smooth);
}

.section-num {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    color: var(--faded-silver);
    display: block;
    margin-top: 0.5rem;
}

.spread-divider {
    flex: 0 0 1px;
    height: 300px;
    position: relative;
}

.divider-line {
    width: 1px;
    height: 0;
    background: rgba(200, 169, 110, 0.3);
    transition: height 800ms var(--ease-enter);
}

.divider-line.drawn {
    height: 100%;
}

.spread-right {
    flex: 1;
}

.spread-heading {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(1.2rem, 2vw, 1.6rem);
    color: var(--aged-gold);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.spread-right p {
    color: var(--signal-white);
    margin-bottom: 1rem;
}

.parse-tree {
    position: absolute;
    bottom: 2rem;
    right: 3rem;
    width: 200px;
    opacity: 0.3;
}

.tree-branch {
    stroke: rgba(200, 169, 110, 0.4);
    stroke-width: 1;
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    transition: stroke-dashoffset 1.5s ease-out;
}

.parse-tree.drawn .tree-branch {
    stroke-dashoffset: 0;
}

.tree-label {
    font-family: var(--font-mono);
    font-size: 8px;
    fill: var(--faded-silver);
}

/* ===== Chapter 4: The Field ===== */
.chapter-field {
    background: var(--bg-deep);
    padding: 4rem;
}

.unicode-field {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.uni-char {
    position: absolute;
    font-family: var(--font-body);
    color: var(--aged-gold);
    pointer-events: none;
    transition: transform 800ms ease-out;
}

.field-text {
    position: relative;
    z-index: 1;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    color: var(--aged-gold);
    text-align: center;
    letter-spacing: 0.03em;
}

/* ===== Chapter 5: The Beginning ===== */
.chapter-begin {
    background: var(--bg-deep);
    gap: 3rem;
}

.begin-word {
    display: inline-flex;
    gap: 0;
}

.begin-letter {
    font-family: var(--font-display);
    font-size: clamp(3rem, 10vw, 10rem);
    font-variation-settings: 'wght' 100;
    text-transform: uppercase;
    color: var(--warm-ivory);
    letter-spacing: -0.02em;
    opacity: 0;
    transform: translateY(30px);
    transition: font-variation-settings 300ms ease, color 300ms ease, text-shadow 300ms ease, opacity 500ms var(--ease-bounce), transform 500ms var(--ease-bounce);
}

.begin-letter.entered {
    opacity: 1;
    transform: translateY(0);
}

.begin-letter:hover {
    font-variation-settings: 'wght' 900;
    color: var(--dawn-amber);
    text-shadow: 0 0 40px rgba(232, 184, 74, 0.4);
}

.contact-field {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.email-input {
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--aged-gold);
    color: var(--warm-ivory);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    padding: 0.5rem 0;
    width: 250px;
    text-align: center;
    outline: none;
    letter-spacing: 0.06em;
}

.email-input::placeholder {
    color: var(--faded-silver);
}

.contact-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    color: var(--faded-silver);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .spread-layout {
        flex-direction: column;
        gap: 2rem;
    }
    .spread-divider { display: none; }
    .spread-left { flex: none; }
    .parse-tree { display: none; }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .morph-letter { font-variation-settings: 'wght' 500; }
    .breath-line { opacity: 1; transform: none; }
    .begin-letter { opacity: 1; transform: none; }
}