/* ==========================================================================
   Theme tokens
   ========================================================================== */

/* Light is "Miami day": cream, hot pink and teal. */
:root {
  --bg: #fff7f0;
  --panel: #ffffff;
  --line: #f1d8e4;
  --text: #2a1840;
  --muted: #76608a;
  --accent: #d1146c;
  --accent-2: #00879a;
  --accent-soft: #ffe1ee;
  --pop: #2a1840;
  --shadow: rgba(42, 24, 64, .22);

  /* The sunset stripe and the cover sky stay the same in every theme. */
  --sunset: linear-gradient(90deg, #ffd23f, #ff7a3d 35%, #ff2e88 65%, #8a3ffc);
  --sky: linear-gradient(180deg, #120630 0%, #2b0f5c 45%, #6a1a7a 75%, #c2347f 100%);
  --neon-pink: #ff2e88;
  --neon-cyan: #2de2e6;

  /* Reading size; js/prefs.js overrides this. */
  --size: 19px;

  --serif: "Literata", Georgia, serif;
  --sans: "Source Sans 3", system-ui, sans-serif;
  --display: "Righteous", var(--sans);
  --neon: "Monoton", var(--display);
}

/* Dark is "synthwave night". It's listed twice: once for the system setting
   (when the reader hasn't picked a theme) and once for an explicit choice. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --bg: #150a2e;
    --panel: #1f1142;
    --line: #3a2468;
    --text: #efe6ff;
    --muted: #a996c9;
    --accent: #ff5cab;
    --accent-2: #2de2e6;
    --accent-soft: #3b1650;
    --pop: #2de2e6;
    --shadow: rgba(0, 0, 0, .55);
  }
}

:root[data-theme="dark"] {
  --bg: #150a2e;
  --panel: #1f1142;
  --line: #3a2468;
  --text: #efe6ff;
  --muted: #a996c9;
  --accent: #ff5cab;
  --accent-2: #2de2e6;
  --accent-soft: #3b1650;
  --pop: #2de2e6;
  --shadow: rgba(0, 0, 0, .55);
}

/* Sepia is "sunset": warm peach with magenta and orange. */
:root[data-theme="sepia"] {
  --bg: #ffeadb;
  --panel: #fff4ea;
  --line: #f3cdb7;
  --text: #3d1f2e;
  --muted: #84586a;
  --accent: #c2255c;
  --accent-2: #b8530f;
  --accent-soft: #ffd6c4;
  --pop: #3d1f2e;
  --shadow: rgba(80, 30, 20, .22);
}


/* ==========================================================================
   Base
   ========================================================================== */

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 var(--sans);
}

::selection {
  background: var(--neon-pink);
  color: #fff;
}

a {
  color: var(--accent);
}

button {
  font: inherit;
  color: inherit;
}


/* ==========================================================================
   Top bar
   ========================================================================== */

.bar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 8px;
  height: 52px;
  padding: 0 12px;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

/* The sunset stripe fills in as you read. */
.progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 3px;
  background: var(--sunset) 0 0 / 100vw 100%;
  transition: width .2s;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 36px;
  height: 36px;
  padding: 0 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
}

.btn:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.btn:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 1px;
}

.btn-large {
  font-size: 17px;
}

.where {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.where a {
  color: inherit;
  text-decoration: none;
}

.where b {
  color: var(--text);
  font: 400 15px var(--display);
  letter-spacing: .04em;
}


/* ==========================================================================
   Contents drawer
   ========================================================================== */

.scrim {
  position: fixed;
  inset: 0;
  z-index: 30;
  background: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
}

.drawer {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 31;
  display: flex;
  flex-direction: column;
  width: min(340px, 88vw);
  background: var(--panel);
  border-right: 1px solid var(--line);
  transform: translateX(-100%);
  transition: transform .22s ease;
}

body.toc-open .scrim {
  opacity: 1;
  pointer-events: auto;
}

body.toc-open .drawer {
  transform: none;
  box-shadow: 0 0 40px var(--shadow);
}

.drawer header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 12px 12px 18px;
  border-bottom: 3px solid transparent;
  border-image: var(--sunset) 1;
}

.drawer header h2 {
  margin: 0;
  font: 400 17px var(--display);
  letter-spacing: .04em;
}

.drawer header h2 a {
  color: inherit;
  text-decoration: none;
}

.toc {
  overflow-y: auto;
  padding: 6px 0 32px;
}

.toc details {
  border-bottom: 1px solid var(--line);
}

.toc summary {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 11px 18px;
  font: 400 16px var(--display);
  letter-spacing: .02em;
  list-style: none;
  cursor: pointer;
}

.toc details[open] summary {
  color: var(--accent);
}

.toc summary::-webkit-details-marker {
  display: none;
}

.toc summary span {
  color: var(--muted);
  font: 400 13px var(--sans);
}

.toc .chapters {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(44px, 1fr));
  gap: 4px;
  padding: 0 14px 14px;
}

.toc .chapters a {
  display: block;
  padding: 6px 0;
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
  text-align: center;
  text-decoration: none;
}

.toc .chapters a:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.toc .chapters a[aria-current="true"] {
  background: linear-gradient(135deg, #ff7a3d, #ff2e88);
  color: #fff;
  font-weight: 600;
}


/* ==========================================================================
   Cover page
   ========================================================================== */

/* The hero is a night sky in every theme, like a cassette cover: a striped
   sun sinking into a neon grid, with the title in neon tubes. */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--sky);
  color: #fff;
}

.sky {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.sun {
  position: absolute;
  right: max(4vw, calc(50% - 470px));
  bottom: 34%;
  width: clamp(150px, 26vw, 300px);
  aspect-ratio: 1;
  border-radius: 50%;
  background: linear-gradient(180deg, #ffe45c 0%, #ffa43d 40%, #ff4f8b 75%, #d6267f 100%);
  box-shadow: 0 0 60px rgba(255, 79, 139, .55);
  /* Horizontal bands cut out of the lower half, getting thicker toward the
     horizon. */
  -webkit-mask: linear-gradient(180deg,
    #000 0 50%, transparent 50% 53%, #000 53% 62%, transparent 62% 66%,
    #000 66% 74%, transparent 74% 79%, #000 79% 86%, transparent 86% 92%,
    #000 92% 100%);
  mask: linear-gradient(180deg,
    #000 0 50%, transparent 50% 53%, #000 53% 62%, transparent 62% 66%,
    #000 66% 74%, transparent 74% 79%, #000 79% 86%, transparent 86% 92%,
    #000 92% 100%);
  transform: translateY(50%);
}

.grid {
  position: absolute;
  left: -50%;
  right: -50%;
  bottom: 0;
  height: 34%;
  background:
    linear-gradient(180deg, #2b0f5c 0%, transparent 35%),
    repeating-linear-gradient(90deg, transparent 0 58px, rgba(45, 226, 230, .75) 58px 60px),
    repeating-linear-gradient(180deg, transparent 0 22px, rgba(255, 46, 136, .8) 22px 24px),
    #12062e;
  border-top: 2px solid var(--neon-pink);
  box-shadow: 0 -4px 18px rgba(255, 46, 136, .6);
  transform: perspective(240px) rotateX(48deg);
  transform-origin: 50% 100%;
}

.hero-inner {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
  padding: 72px 20px 150px;
}

.cover-body {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 20px 96px;
}

.cover .kicker {
  color: var(--neon-cyan);
  font: 400 15px var(--display);
  letter-spacing: .16em;
  text-transform: uppercase;
  text-shadow: 0 0 10px rgba(45, 226, 230, .6);
}

.cover h1 {
  max-width: 11em;
  margin: 14px 0 10px;
  color: #fff;
  font: 400 clamp(40px, 9vw, 80px)/1.15 var(--neon);
  text-shadow:
    0 0 6px #fff,
    0 0 18px var(--neon-pink),
    0 0 42px var(--neon-pink);
}

.cover .by {
  margin: 0;
  color: #ffc4e1;
  font: italic 20px var(--serif);
}

.cover .blurb {
  max-width: 560px;
  margin: 0 0 28px;
  font-size: 17px;
}

.cover .stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-bottom: 32px;
  color: var(--muted);
  font-size: 14px;
}

.cover .stats span::before {
  content: "■ ";
  color: var(--accent-2);
}

.cover h2 {
  margin: 0 0 14px;
  color: var(--accent);
  font: 400 15px var(--display);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 56px;
}

/* Memphis-style buttons and cards: a solid border and a hard offset shadow
   that grows on hover. */
.primary,
.secondary {
  display: inline-flex;
  align-items: center;
  padding: 11px 18px;
  border: 2px solid var(--pop);
  border-radius: 10px;
  box-shadow: 4px 4px 0 var(--pop);
  text-decoration: none;
  transition: transform .12s, box-shadow .12s;
}

.primary {
  gap: 8px;
  background: linear-gradient(135deg, #ff7a3d, #ff2e88 60%, #c2189a);
  color: #fff;
  font: 400 17px var(--display);
  letter-spacing: .03em;
}

.secondary {
  background: var(--panel);
  color: var(--text);
  font-weight: 600;
}

.primary:hover,
.secondary:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--pop);
}

.parts {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
}

.parts a {
  display: block;
  padding: 14px 16px;
  border: 2px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  transition: transform .12s, box-shadow .12s, border-color .12s;
}

.parts a:hover {
  border-color: var(--pop);
  box-shadow: 4px 4px 0 var(--accent-2);
  transform: translate(-2px, -2px);
}

.parts b {
  display: block;
  color: var(--accent);
  font: 400 18px var(--display);
  letter-spacing: .02em;
}

.parts span {
  color: var(--muted);
  font-size: 13px;
}

.foot {
  margin-top: 56px;
  color: var(--muted);
  font-size: 13px;
}


/* ==========================================================================
   Chapter page
   ========================================================================== */

.chapter {
  max-width: 40em;
  margin: 0 auto;
  padding: 48px 20px 40px;
  font-size: var(--size);
}

.chapter .part {
  display: inline-block;
  margin: 0;
  padding-bottom: 4px;
  border-bottom: 3px solid transparent;
  border-image: var(--sunset) 1;
  color: var(--accent-2);
  font: 400 14px var(--display);
  letter-spacing: .14em;
  text-transform: uppercase;
}

.chapter h1 {
  margin: .4em 0 1.2em;
  color: var(--text);
  font: 400 2em/1.15 var(--display);
  letter-spacing: .02em;
  text-shadow: .07em .07em 0 color-mix(in srgb, var(--accent) 30%, transparent);
}

.prose {
  font-family: var(--serif);
  line-height: 1.7;
  -webkit-hyphens: auto;
  hyphens: auto;
}

.prose p {
  margin: 0 0 1em;
}

/* Book-style paragraphs: indented, without a gap, after the first. */
.prose p + p {
  margin-top: -.4em;
  text-indent: 1.4em;
}

.prose .verse {
  margin: 1.2em 0 1.2em 1.4em;
  font-style: italic;
  text-indent: 0;
  white-space: pre-line;
}

.prose .note {
  margin: .6em 0 1.2em;
  padding-left: .9em;
  border-left: 3px solid var(--accent-2);
  color: var(--muted);
  font-size: .82em;
  text-indent: 0;
}

.prose .note + p,
.prose .verse + p {
  margin-top: 0;
  text-indent: 0;
}

.nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  max-width: 40em;
  margin: 0 auto;
  padding: 8px 20px 80px;
}

.nav a {
  display: block;
  padding: 14px 16px;
  border: 2px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--text);
  text-decoration: none;
  transition: transform .12s, box-shadow .12s, border-color .12s;
}

.nav a:hover {
  border-color: var(--pop);
  box-shadow: 4px 4px 0 var(--accent-2);
  transform: translate(-2px, -2px);
}

.nav small {
  display: block;
  color: var(--accent);
  font: 400 12px var(--display);
  letter-spacing: .1em;
  text-transform: uppercase;
}

.nav .next {
  grid-column: 2;
  text-align: right;
}


/* ==========================================================================
   Status messages (loading, errors)
   ========================================================================== */

.status {
  max-width: 40em;
  margin: 0 auto;
  padding: 80px 20px;
  color: var(--muted);
  text-align: center;
}


/* ==========================================================================
   Responsive, motion and print
   ========================================================================== */

@media (max-width: 560px) {
  .btn .label {
    display: none;
  }

  .chapter {
    padding-top: 32px;
  }

  .hero-inner {
    padding: 48px 16px 120px;
  }

  .cover-body {
    padding: 32px 16px 72px;
  }

  .sun {
    right: 12px;
    width: 110px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .primary,
  .secondary,
  .parts a,
  .nav a {
    transition: none;
  }
}

@media print {
  .bar,
  .drawer,
  .scrim,
  .nav {
    display: none !important;
  }
}