:root {
    --bg-primary: #0b0f1a;
    --bg-surface: #111827;

    --ink-primary: #f3f4f6;
    --ink-muted: #9ca3af;

    --oxford-blue: #002147;

    --neon-blue: #00e5ff;
    --neon-pink: #ff4fd8;

    --glow-soft: 0 0 8px rgba(0, 229, 255, 0.4);
    --glow-strong: 0 0 14px rgba(255, 79, 216, 0.45);

    --font-body: 'EB Garamond', serif;
    --font-display: 'Libre Baskerville', serif;

    --text-body: 1.1rem;
    --text-title: clamp(2.2rem, 4vw, 2.8rem);

    --max-width: 760px;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;

    --radius: 6px;
    --transition: 180ms ease;
}

/* GLOBAL FOUNDATION */

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

html {
    background: var(--bg-primary);
}

body {
    margin: 0;
    background: var(--bg-primary);
    color: var(--ink-primary);
    font-family: var(--font-body);
    font-size: var(--text-body);
    line-height: 1.75;
    padding: var(--space-xl) 1.5rem;
    text-rendering: optimizeLegibility;
    counter-reset: footnote;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background: linear-gradient(
        rgba(0, 229, 255, 0.03) 1px,
        transparent 1px
    );
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
}

/* HEADER */

header {
    position: relative;
    z-index: 1;
    max-width: var(--max-width);
    margin: 0 auto var(--space-xl);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid rgba(0, 229, 255, 0.25);
}

header h1 {
    margin: 0 0 0.75rem;
    font-family: var(--font-display);
    font-size: var(--text-title);
    color: var(--neon-blue);
    text-shadow: var(--glow-soft);
    letter-spacing: 0.02em;
}

header p {
    margin: 0 0 1.5rem;
    font-size: 0.9rem;
    color: var(--ink-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

/* RETURN BUTTON */

.return-button {
    display: inline-block;
    font-size: 0.9rem;
    color: var(--neon-blue);
    text-decoration: none;
    border: 1px solid rgba(0, 229, 255, 0.4);
    padding: 0.4rem 0.9rem;
    border-radius: var(--radius);
    transition: all var(--transition);
}

.return-button:hover {
    border-color: var(--neon-blue);
    box-shadow: var(--glow-soft);
    transform: translateY(-2px);
}

/* ESSAY CARD */

.essay-content {
    position: relative;
    z-index: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    background: var(--bg-surface);
    padding: var(--space-xl);
    border-radius: var(--radius);
    border: 1px solid rgba(0, 229, 255, 0.15);

    box-shadow:
        0 0 0 1px rgba(0, 229, 255, 0.05),
        0 0 40px rgba(0, 229, 255, 0.05);

    transition: transform var(--transition),
                box-shadow var(--transition);
}

.essay-content:hover {
    transform: translateY(-4px);
    box-shadow:
        0 0 0 1px rgba(0, 229, 255, 0.2),
        0 0 60px rgba(0, 229, 255, 0.08);
}

/* TEXT */

.essay-content p {
    margin-bottom: var(--space-md);
    text-align: justify;
}

.essay-content p:first-of-type {
    font-size: 1.18rem;
}

/* HEADINGS */

.essay-content h2 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    margin-top: var(--space-lg);
    margin-bottom: 0.8rem;
    color: var(--neon-pink);
    text-shadow: var(--glow-strong);
    border-left: 3px solid var(--neon-pink);
    padding-left: 0.8rem;
    transition: text-shadow var(--transition);
}

.essay-content h2:hover {
    text-shadow: 0 0 18px rgba(255, 79, 216, 0.6);
}

/* EMPHASIS */

strong {
    color: var(--neon-blue);
}

em {
    color: var(--neon-pink);
}

/* ACCESSIBILITY */

:focus-visible {
    outline: 2px solid var(--neon-blue);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}

/* RESPONSIVE */

@media (max-width: 768px) {
    body {
        padding: var(--space-lg) 1rem;
    }

    .essay-content {
        padding: var(--space-lg);
    }
}

/* FOOTNOTES */

.footnote-ref {
    color: var(--neon-blue);
    text-decoration: none;
    font-size: 0.8rem;
    transition: var(--transition);
}

.footnote-ref:hover {
    text-shadow: var(--glow-soft);
}

.footnote-ref::before {
    counter-increment: footnote;
    content: counter(footnote);
}

.footnotes-divider {
    margin: var(--space-xl) 0 var(--space-lg);
    border: none;
    border-top: 1px solid rgba(0, 229, 255, 0.25);
}

.footnotes ol {
    padding-left: 1.2rem;
}

.footnotes li {
    margin-bottom: 0.8rem;
    font-size: 0.95rem;
    color: var(--ink-muted);
}

.footnote-back {
    margin-left: 0.5rem;
    text-decoration: none;
    color: var(--neon-pink);
    font-size: 0.85rem;
    transition: var(--transition);
}

.footnote-back:hover {
    text-shadow: var(--glow-strong);
}

/* BIBLIOGRAPHY */

.bibliography ul {
    list-style: none;
    padding-left: 0;
}

.bibliography li {
    margin-bottom: 1rem;
    padding-left: 1rem;
    border-left: 2px solid rgba(255, 79, 216, 0.3);
    color: var(--ink-muted);
    font-size: 0.95rem;
}

/* QUOTE BLOCK */

.quote-note {
    background: rgba(0, 33, 71, 0.85);
    border: 1px solid rgba(0,229,255,0.25);
    border-left: 4px solid var(--neon-blue);
    border-radius: var(--radius);
    padding: 1.2rem 1.4rem;
    margin: var(--space-lg) 0;
    box-shadow: 0 0 18px rgba(0,229,255,0.15);
}

.quote-source {
    font-size: 0.95rem;
    color: var(--neon-blue);
    margin-bottom: 0.7rem;
    font-weight: 500;
}

.quote-note blockquote {
    margin: 0;
    font-size: 1.2rem;
    line-height: 1.65;
    color: var(--ink-primary);
    font-style: italic;
}

/* =========================
   FINAL CHAPTER SYSTEM
========================= */

.chapter{
    margin-top:2rem;
    padding-top:0.8rem;
    border-top:1px solid rgba(0,229,255,0.12);
}

.chapter + .chapter{
    margin-top:1.8rem;
}

.chapter + .chapter + .chapter{
    margin-top:1.6rem;
}

.chapter + .chapter + .chapter + .chapter{
    margin-top:1.4rem;
}

.chapter:not(:first-child)::before{
    content:"";
    display:block;
    width:38px;
    height:2px;
    background:var(--neon-blue);
    opacity:0.35;
    margin-bottom:0.5rem;
}

.chapter-header{
    margin-bottom:0.25rem;
}

.chapter-meta{
    font-size:0.72rem;
    letter-spacing:0.22em;
    text-transform:uppercase;
    color:var(--ink-muted);
    margin-bottom:0.1rem;
}

.chapter-title{
    font-family:var(--font-display);
    font-size:1.55rem;
    margin:0;
    color:var(--neon-blue);
    text-shadow:var(--glow-soft);
    padding-left:0.6rem;
    border-left:3px solid var(--neon-blue);
}

.chapter-header + *{
    margin-top:0.25rem;
}

.chapter-list{
    margin-top:0.3rem;
    padding-left:1.2rem;
}

.chapter-list li{
    margin-bottom:0.35rem;
}


/* FOOTNOTE LINKS — POLISHED STYLE */

.footnote-ref {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    font-size: 0.75rem;
    color: var(--neon-blue);
    text-decoration: none;

    width: 18px;
    height: 18px;

    border-radius: 50%;
    border: 1px solid rgba(0, 229, 255, 0.4);

    margin-left: 3px;

    transition: all var(--transition);
    vertical-align: super;
}

.footnote-ref:hover {
    background: rgba(0, 229, 255, 0.08);
    box-shadow: var(--glow-soft);
    border-color: var(--neon-blue);
    transform: translateY(-1px) scale(1.05);
}

/* FOOTNOTE BACK LINKS */

.footnote-back {
    display: inline-block;

    color: var(--neon-pink);
    text-decoration: none;
    font-weight: 500;

    margin-left: 0.6rem;

    transition: all var(--transition);
}

.footnote-back:hover {
    text-shadow: var(--glow-strong);
    transform: translateX(-2px);
}