:root {
    --fog-linen: #f2f7f8;
    --shore-mist: #e4edef;
    --ink-stone: #1e2d33;
    --dusk-slate: #4a6670;
    --heisei-blue: #5a8fa0;
    --amber-tide: #c49a6c;
    --foam: #dce6e9;
    --glass-sea: #8baab3;
    --bg-gradient-end: #e8f0f2;
}

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

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

body {
    background: linear-gradient(to bottom, var(--fog-linen), var(--bg-gradient-end));
    color: var(--ink-stone);
    font-family: 'Libre Baskerville', Georgia, serif;
    font-size: clamp(1rem, 1.8vw, 1.15rem);
    line-height: 1.78;
    letter-spacing: 0.01em;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Codex Column Widths */
.codex-column {
    max-width: 680px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.codex-column-wide {
    max-width: 780px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.codex-column-narrow {
    max-width: 580px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Chapter Base */
.chapter {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 6rem 0;
}

.chapter-number {
    position: absolute;
    top: 2.5rem;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.7;
}

/* Chapter Content - initially hidden for skeleton loading effect */
.chapter-content {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 800ms ease-out, transform 800ms ease-out;
    width: 100%;
}

.chapter-content.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* Hero Section - Chapter 1 */
.chapter-1 {
    justify-content: center;
    text-align: center;
}

.heisei-seal {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.08;
    pointer-events: none;
}

.hero-title {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(2.2rem, 5vw, 4.4rem);
    letter-spacing: 0.08em;
    color: var(--ink-stone);
    margin-bottom: 1.2rem;
    text-transform: none;
}

.hero-subtitle {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(1rem, 2vw, 1.3rem);
    letter-spacing: 0.04em;
    color: var(--dusk-slate);
    margin-bottom: 2.5rem;
}

.hero-era {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(1.4rem, 3vw, 2rem);
    letter-spacing: 0.06em;
    color: var(--glass-sea);
}

.era-years {
    font-size: clamp(1rem, 2vw, 1.4rem);
    letter-spacing: 0.12em;
    color: var(--dusk-slate);
}

/* Chapter Titles */
.chapter-title {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(1.6rem, 3.5vw, 2.8rem);
    letter-spacing: 0.04em;
    color: var(--ink-stone);
    margin-bottom: 0.4rem;
    text-transform: none;
}

.chapter-period {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 300;
    font-size: 0.9rem;
    letter-spacing: 0.12em;
    color: var(--glass-sea);
    margin-bottom: 2.5rem;
}

/* Body Text */
.body-text {
    margin-bottom: 1.8rem;
    color: var(--ink-stone);
}

/* Foreign Terms */
.foreign-term {
    font-style: italic;
}

/* Footnotes */
.footnote {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 300;
    font-size: 0.7rem;
    color: var(--heisei-blue);
    cursor: default;
    position: relative;
    margin-left: 1px;
    padding: 0 3px;
    border-radius: 50%;
    border: 1px solid var(--heisei-blue);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.1em;
    height: 1.1em;
    vertical-align: super;
    line-height: 1;
}

.footnote::after {
    content: attr(data-note);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    width: 280px;
    padding: 0.8rem 1rem;
    background: var(--shore-mist);
    border: 1px solid var(--glass-sea);
    border-radius: 8px;
    font-family: 'Libre Baskerville', Georgia, serif;
    font-size: 0.78rem;
    font-style: normal;
    font-weight: 400;
    line-height: 1.6;
    color: var(--dusk-slate);
    opacity: 0;
    pointer-events: none;
    transition: opacity 300ms ease-out, transform 300ms ease-out;
    z-index: 100;
}

.footnote:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

/* Pull Quotes */
.pull-quote {
    margin: 2.5rem 0;
    padding: 0 2rem;
    padding-left: 2rem;
    border-left: 1px solid var(--heisei-blue);
    position: relative;
}

.pull-quote p {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(1.1rem, 2vw, 1.6rem);
    line-height: 1.65;
    color: var(--dusk-slate);
    letter-spacing: 0.02em;
}

/* Section Dividers */
.section-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 2.5rem 0;
    position: relative;
}

.section-divider::before,
.section-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: rgba(139, 170, 179, 0.4);
}

.divider-diamond {
    font-size: 0.7rem;
    color: var(--glass-sea);
    padding: 0 1rem;
    line-height: 1;
}

/* Skeleton Loading */
.skeleton-group {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    max-width: 680px;
    padding: 0 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    opacity: 1;
    transition: opacity 400ms ease-out;
}

.skeleton-group.hidden {
    opacity: 0;
    pointer-events: none;
}

.skeleton-block {
    background: var(--foam);
    border-radius: 4px;
    animation: skeleton-breathe 2s ease-in-out infinite;
}

.skeleton-heading {
    height: 32px;
    width: 60%;
}

.skeleton-text {
    height: 16px;
    width: 100%;
}

.skeleton-text.short {
    width: 75%;
}

@keyframes skeleton-breathe {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.8; }
}

/* Margin Annotations (Desktop Only) */
.margin-annotations {
    position: fixed;
    left: 3rem;
    top: 0;
    height: 100vh;
    width: 40px;
    pointer-events: none;
    z-index: 10;
}

.margin-shape {
    position: absolute;
    left: 0;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 2s ease-out, transform 2s ease-out;
}

.margin-shape.visible {
    opacity: 0.3;
    transform: translateY(0);
}

.margin-triangle {
    top: 25vh;
}

.margin-circle {
    top: 50vh;
}

.margin-square {
    top: 75vh;
}

/* Colophon - Chapter 5 */
.chapter-5 {
    justify-content: center;
    text-align: center;
    position: relative;
}

.colophon-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240' viewBox='0 0 120 120'%3E%3Ccircle cx='60' cy='60' r='58' fill='none' stroke='%238baab3' stroke-width='0.5'/%3E%3Cline x1='2' y1='60' x2='118' y2='60' stroke='%238baab3' stroke-width='0.5'/%3E%3Cline x1='60' y1='2' x2='60' y2='118' stroke='%238baab3' stroke-width='0.5'/%3E%3C/svg%3E");
    background-size: 240px 240px;
    opacity: 0.04;
    pointer-events: none;
}

.colophon-line-container {
    margin-bottom: 2rem;
    width: 100%;
}

.drawing-line {
    stroke-dasharray: 680;
    stroke-dashoffset: 680;
    transition: stroke-dashoffset 3s ease-in-out;
}

.drawing-line.drawn {
    stroke-dashoffset: 0;
}

.colophon-date {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(1rem, 2vw, 1.4rem);
    letter-spacing: 0.12em;
    color: var(--amber-tide);
    opacity: 0;
    transition: opacity 1.5s ease-out;
    transition-delay: 3s;
    margin-bottom: 0.8rem;
}

.colophon-date.visible {
    opacity: 1;
}

.colophon-label {
    font-family: 'Josefin Sans', sans-serif;
    font-weight: 300;
    font-size: clamp(2rem, 4vw, 3.5rem);
    letter-spacing: 0.06em;
    color: var(--glass-sea);
    opacity: 0;
    transition: opacity 1.5s ease-out;
    transition-delay: 3.5s;
}

.colophon-label.visible {
    opacity: 0.4;
}

/* Responsive - Tablet */
@media (max-width: 1024px) {
    .margin-annotations {
        display: none;
    }

    .codex-column,
    .codex-column-wide,
    .codex-column-narrow {
        max-width: 90vw;
    }
}

/* Responsive - Mobile */
@media (max-width: 768px) {
    .margin-annotations {
        display: none;
    }

    .codex-column,
    .codex-column-wide,
    .codex-column-narrow {
        max-width: 92vw;
        padding: 0 4%;
    }

    .chapter {
        padding: 4rem 0;
    }

    .heisei-seal svg {
        width: 60px;
        height: 60px;
    }

    .heisei-seal {
        opacity: 0.05;
    }

    .pull-quote {
        padding: 0 1rem;
        padding-left: 1rem;
    }

    .footnote::after {
        width: 220px;
        left: auto;
        right: -20px;
        transform: translateY(4px);
    }

    .footnote:hover::after {
        transform: translateY(0);
    }

    .skeleton-group {
        max-width: 92vw;
        padding: 0 4%;
    }
}

/* Link Styles */
a {
    color: var(--heisei-blue);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 300ms ease-out, color 300ms ease-out;
}

a:hover {
    border-bottom-color: var(--heisei-blue);
    color: var(--amber-tide);
}

/* Selection */
::selection {
    background: var(--foam);
    color: var(--ink-stone);
}
/* Mobile footnote tap state */
@media (max-width: 768px) {
    .footnote.active::after {
        opacity: 1;
        transform: translateY(0);
        pointer-events: auto;
    }
}