/* ==========================================================================
   The Time Parallax — reader stylesheet
   Themes live on :root[data-theme]; every reading preference is a CSS custom
   property so the settings panel only has to set a variable.
   ========================================================================== */

/* --- palette -------------------------------------------------------------- */

:root {
  --bg: #f4f1ea;
  --bg-elevated: #fffdf8;
  --bg-sunken: #e8e3d8;
  --ink: #1c1d21;
  --ink-soft: #4d5058;
  --ink-faint: #5a5d67;
  --rule: #d8d2c4;
  --accent: #10456f;
  --accent-soft: #e2ecf5;
  --accent-ink: #ffffff;
  --focus: #b8651b;
  --warn: #8a3a12;
  --shadow: 0 1px 2px rgba(20, 24, 40, .07), 0 10px 30px -18px rgba(20, 24, 40, .45);

  --reader-font-size: 1.15rem;
  --reader-line-height: 1.75;
  --reader-letter-spacing: 0rem;
  --reader-word-spacing: 0rem;
  --reader-paragraph-spacing: 1.1rem;
  --reader-measure: 34rem;

  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-reader: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --radius: 14px;
  --transition: 160ms ease;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="sepia"]):not([data-theme="contrast"]) {
    --bg: #10131a;
    --bg-elevated: #171b24;
    --bg-sunken: #0b0e14;
    --ink: #e7e9ee;
    --ink-soft: #b3b8c4;
    --ink-faint: #8b91a0;
    --rule: #2a303c;
    --accent: #78b7e8;
    --accent-soft: #1b2634;
    --accent-ink: #08121d;
    --focus: #ffb454;
    --warn: #ff9d6b;
    --shadow: 0 1px 2px rgba(0, 0, 0, .5), 0 18px 40px -24px rgba(0, 0, 0, .9);
  }
}

:root[data-theme="dark"] {
  --bg: #10131a;
  --bg-elevated: #171b24;
  --bg-sunken: #0b0e14;
  --ink: #e7e9ee;
  --ink-soft: #b3b8c4;
  --ink-faint: #8b91a0;
  --rule: #2a303c;
  --accent: #78b7e8;
  --accent-soft: #1b2634;
  --accent-ink: #08121d;
  --focus: #ffb454;
  --warn: #ff9d6b;
  --shadow: 0 1px 2px rgba(0, 0, 0, .5), 0 18px 40px -24px rgba(0, 0, 0, .9);
}

:root[data-theme="sepia"] {
  --bg: #f3e7d0;
  --bg-elevated: #fbf3e2;
  --bg-sunken: #e8d9bd;
  --ink: #3b2f21;
  --ink-soft: #5d4c37;
  --ink-faint: #6a5a40;
  --rule: #d9c7a5;
  --accent: #8a4b1c;
  --accent-soft: #efdcc0;
  --accent-ink: #fdf6e9;
  --focus: #1f5d8c;
  --warn: #8a3a12;
}

:root[data-theme="contrast"] {
  --bg: #000000;
  --bg-elevated: #000000;
  --bg-sunken: #000000;
  --ink: #ffffff;
  --ink-soft: #ffffff;
  --ink-faint: #e8e8e8;
  --rule: #ffffff;
  --accent: #ffe600;
  --accent-soft: #1a1a00;
  --accent-ink: #000000;
  --focus: #00e5ff;
  --warn: #ffd0a0;
  --shadow: none;
}

:root[data-theme="contrast"] * {
  text-shadow: none !important;
}

/* --- typefaces ------------------------------------------------------------ */

:root[data-font="sans"] { --font-reader: var(--font-ui); }
:root[data-font="mono"] { --font-reader: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, monospace; }
:root[data-font="dyslexic"] {
  --font-reader: "OpenDyslexic", "Atkinson Hyperlegible", Verdana, Tahoma, "Trebuchet MS", sans-serif;
}
:root[data-font="dyslexic"] .prose {
  --reader-letter-spacing: max(var(--reader-letter-spacing), .045rem);
  --reader-word-spacing: max(var(--reader-word-spacing), .12rem);
}

:root[data-width="narrow"] { --reader-measure: 28rem; }
:root[data-width="medium"] { --reader-measure: 34rem; }
:root[data-width="wide"]   { --reader-measure: 44rem; }

/* --- base ----------------------------------------------------------------- */

* { box-sizing: border-box; }

/* The attribute must win over component display rules (buttons, flex items). */
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
html[data-calm="on"] { scroll-behavior: auto; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-wrap: break-word;
}

.shell {
  width: min(100% - 2.5rem, 68rem);
  margin-inline: auto;
}

a { color: var(--accent); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem; top: -4rem;
  z-index: 60;
  padding: .75rem 1.1rem;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 0 0 var(--radius) var(--radius);
  font-weight: 600;
  text-decoration: none;
  transition: top var(--transition);
}
.skip-link:focus { top: 0; }

/* --- reading progress ----------------------------------------------------- */

.progress-wrap {
  position: fixed;
  inset-inline: 0; top: 0;
  height: 4px;
  background: color-mix(in srgb, var(--rule) 60%, transparent);
  z-index: 40;
}
.progress-bar {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 90ms linear;
}

/* --- header --------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
:root[data-calm="on"] .site-header { backdrop-filter: none; background: var(--bg); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .7rem 0;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: .65rem;
  color: inherit;
  text-decoration: none;
  min-width: 0;
}
.brand-mark { color: var(--accent); display: grid; place-items: center; flex: none; }
.brand-text { display: grid; min-width: 0; }
.brand-text strong { font-size: 1.02rem; letter-spacing: .01em; }
.brand-text small { color: var(--ink-faint); font-size: .78rem; }

.site-nav {
  display: flex;
  align-items: center;
  gap: .35rem;
  flex-wrap: wrap;
}
.site-nav > a {
  padding: .45rem .7rem;
  border-radius: 9px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: .9rem;
  font-weight: 500;
}
.site-nav > a:hover { background: var(--bg-sunken); color: var(--ink); }
.site-nav > a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }

.lang-switch {
  display: flex;
  align-items: center;
  gap: .35rem;
  padding: .2rem .5rem .2rem .55rem;
  border: 1px solid var(--rule);
  border-radius: 9px;
  background: var(--bg-elevated);
}
.lang-icon { color: var(--ink-faint); display: grid; place-items: center; }
.lang-switch select {
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: .88rem;
  padding: .3rem .1rem;
  cursor: pointer;
}

.settings-button,
.primary-button,
.ghost-button,
.icon-button {
  font: inherit;
  cursor: pointer;
  border-radius: 10px;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.settings-button {
  padding: .45rem .75rem;
  font-size: .88rem;
  font-weight: 500;
  background: var(--bg-elevated);
  border-color: var(--rule);
  color: var(--ink-soft);
}
.settings-button:hover { color: var(--ink); border-color: var(--accent); }

.primary-button {
  padding: .7rem 1.2rem;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  text-decoration: none;
}
.primary-button:hover { filter: brightness(1.08); }

.ghost-button {
  padding: .68rem 1.1rem;
  background: transparent;
  border-color: var(--rule);
  color: var(--ink);
  font-weight: 500;
  text-decoration: none;
}
.ghost-button:hover { border-color: var(--accent); color: var(--accent); }
.ghost-button.small { padding: .3rem .6rem; font-size: .82rem; }

.icon-button {
  padding: .4rem;
  background: transparent;
  color: var(--ink-soft);
  border-color: transparent;
}
.icon-button:hover { background: var(--bg-sunken); color: var(--ink); }

/* --- hero ----------------------------------------------------------------- */

main { flex: 1 0 auto; }
main:focus { outline: none; }

.hero {
  padding: clamp(2.5rem, 8vw, 5rem) 0 clamp(1.5rem, 4vw, 2.5rem);
  background:
    radial-gradient(60rem 22rem at 15% -10%, var(--accent-soft), transparent 65%),
    radial-gradient(40rem 18rem at 90% 0%, color-mix(in srgb, var(--accent-soft) 70%, transparent), transparent 70%);
}
:root[data-calm="on"] .hero, :root[data-theme="contrast"] .hero { background: none; }

.eyebrow {
  margin: 0 0 .5rem;
  text-transform: uppercase;
  letter-spacing: .16em;
  font-size: .72rem;
  font-weight: 700;
  color: var(--ink-faint);
}

.hero h1 {
  margin: 0;
  font-family: var(--font-reader);
  font-size: clamp(2.1rem, 6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -.015em;
  max-width: 20ch;
}

.hero-meta { color: var(--ink-soft); margin: .8rem 0 1.6rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .7rem; }

/* --- chapter list --------------------------------------------------------- */

.chapters { padding: 1rem 0 3.5rem; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: .6rem;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}
.section-head h2 { margin: 0; font-size: 1.05rem; letter-spacing: .02em; text-transform: uppercase; color: var(--ink-faint); }

.chapter-list { list-style: none; margin: 0; padding: 0; display: grid; gap: .7rem; }

.chapter-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1.1rem;
  padding: 1.05rem 1.2rem;
  background: var(--bg-elevated);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: transform var(--transition), border-color var(--transition);
}
.chapter-card:hover { border-color: var(--accent); transform: translateY(-2px); }
:root[data-calm="on"] .chapter-card:hover { transform: none; }

.chapter-index {
  font-family: var(--font-reader);
  font-size: 1.6rem;
  color: var(--accent);
  opacity: .75;
  font-variant-numeric: tabular-nums;
}
.chapter-body { display: grid; gap: .15rem; min-width: 0; }
.chapter-eyebrow { font-size: .74rem; letter-spacing: .13em; text-transform: uppercase; color: var(--ink-faint); font-weight: 700; }
.chapter-title { font-family: var(--font-reader); font-size: 1.2rem; }
.chapter-resume { font-size: .78rem; color: var(--accent); font-weight: 600; }
.chapter-arrow { color: var(--ink-faint); font-size: 1.2rem; }

.end-note, .end-of-chapter {
  margin-top: 1.6rem;
  color: var(--ink-faint);
  font-size: .88rem;
  text-align: center;
}

.notice {
  padding: .85rem 1rem;
  border-inline-start: 4px solid var(--focus);
  background: var(--bg-sunken);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--ink-soft);
  margin: 0 0 1.2rem;
}

/* --- reader --------------------------------------------------------------- */

.reader-shell { width: min(100% - 2.5rem, var(--reader-measure)); }
.reader { padding: 2rem 0 4rem; }

.crumbs { margin-bottom: 1.8rem; font-size: .88rem; }
.crumbs a { text-decoration: none; color: var(--ink-faint); }
.crumbs a:hover { color: var(--accent); text-decoration: underline; }

.chapter-head { margin-bottom: 2.2rem; }
.chapter-head h1 {
  font-family: var(--font-reader);
  font-size: clamp(1.9rem, 5vw, 2.8rem);
  line-height: 1.12;
  margin: 0 0 .7rem;
  letter-spacing: -.01em;
}
.chapter-meta {
  display: flex;
  align-items: center;
  gap: .6rem;
  flex-wrap: wrap;
  color: var(--ink-faint);
  font-size: .86rem;
  margin: 0;
}

.prose {
  font-family: var(--font-reader);
  font-size: var(--reader-font-size);
  line-height: var(--reader-line-height);
  letter-spacing: var(--reader-letter-spacing);
  word-spacing: var(--reader-word-spacing);
  max-width: 100%;
  color: var(--ink);
  hyphens: auto;
}
:root[data-align="justify"] .prose { text-align: justify; }
:root[data-align="start"] .prose { text-align: start; }

.prose p { margin: 0 0 var(--reader-paragraph-spacing); }
.prose p.plain { white-space: normal; }

.prose p.scene {
  font-variant-caps: small-caps;
  letter-spacing: .08em;
  color: var(--ink-faint);
  text-align: center;
  font-size: .92em;
  margin-block: 2rem;
}

.prose .scene-break {
  border: 0;
  margin: 2.4rem auto;
  width: 6rem;
  height: 1.4rem;
  background: none;
  position: relative;
}
.prose .scene-break::after {
  content: "· · ·";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--ink-faint);
  letter-spacing: .5em;
}

/* Dim everything but the paragraph being read. */
:root[data-focus="on"] .prose p { transition: opacity 220ms ease; opacity: .55; }
:root[data-focus="on"] .prose p:hover,
:root[data-focus="on"] .prose p:focus-within,
:root[data-focus="on"] .prose p.is-current { opacity: 1; }

.prose p.is-speaking {
  background: var(--accent-soft);
  box-shadow: 0 0 0 .4rem var(--accent-soft);
  border-radius: 3px;
}

.chapter-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
}
.nav-card {
  display: grid;
  gap: .2rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  background: var(--bg-elevated);
}
.nav-card:hover { border-color: var(--accent); }
.nav-card.next { text-align: end; }
.nav-card.done { color: var(--ink-faint); font-size: .88rem; align-content: center; background: transparent; border-style: dashed; }
.nav-label { font-size: .74rem; text-transform: uppercase; letter-spacing: .12em; color: var(--ink-faint); font-weight: 700; }
.nav-title { font-family: var(--font-reader); font-size: 1.05rem; }

/* --- static pages --------------------------------------------------------- */

.page { padding: 2.5rem 0 4rem; max-width: 48rem; }
.page-head h1 { font-family: var(--font-reader); font-size: clamp(1.8rem, 5vw, 2.6rem); margin: 0 0 .5rem; }
.page-intro { color: var(--ink-soft); margin: 0 0 1.8rem; }

.callout {
  background: var(--accent-soft);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  margin-bottom: 2rem;
  border: 1px solid var(--rule);
}
.callout p { margin: 0; }

.document { max-width: none; margin-bottom: 3rem; font-size: 1rem; line-height: 1.7; }
.document h2 {
  font-family: var(--font-ui);
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--ink-faint);
  border-bottom: 1px solid var(--rule);
  padding-bottom: .5rem;
  margin-bottom: 1.2rem;
}
.document h3, .document h4 { font-family: var(--font-reader); }
.document ul { padding-inline-start: 1.2rem; }
.document li { margin-bottom: .35rem; }
.document hr { border: 0; border-top: 1px solid var(--rule); margin: 2rem 0; }
.doc-source { font-size: .8rem; color: var(--ink-faint); }
.document p.plain { white-space: pre-wrap; }

.link-list { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: .7rem; }

/* --- footer --------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--rule);
  background: var(--bg-sunken);
  padding: 2rem 0 2.5rem;
  font-size: .84rem;
  color: var(--ink-faint);
}
.site-footer .disclaimer { margin: 0 0 .5rem; max-width: 60ch; }
.site-footer .meta { display: flex; flex-wrap: wrap; gap: .5rem; margin: 0; }
.site-footer .warn { color: var(--warn); }

/* --- settings dialog ------------------------------------------------------ */

.settings-dialog {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  color: var(--ink);
  padding: 0;
  width: min(100% - 2rem, 34rem);
  max-height: min(88vh, 46rem);
  box-shadow: var(--shadow);
}
.settings-dialog::backdrop { background: rgba(8, 10, 16, .55); backdrop-filter: blur(2px); }

.settings-form { padding: 1.3rem 1.4rem 1.5rem; overflow-y: auto; max-height: inherit; }
.settings-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.settings-head h2 { margin: 0; font-size: 1.15rem; }
.settings-hint { color: var(--ink-faint); font-size: .82rem; margin: .2rem 0 1.3rem; }

.setting { border: 0; padding: 0; margin: 0 0 1.3rem; }
.setting > legend, .setting > label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0 0 .5rem;
  font-size: .84rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink-faint);
  width: 100%;
}
.setting output { font-variant-numeric: tabular-nums; text-transform: none; letter-spacing: 0; color: var(--ink-soft); }

.chips { display: flex; flex-wrap: wrap; gap: .45rem; }
.chip { position: relative; }
.chip input { position: absolute; opacity: 0; inset: 0; width: 100%; height: 100%; cursor: pointer; margin: 0; }
.chip span {
  display: block;
  padding: .5rem .8rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  font-size: .88rem;
  background: var(--bg);
}
.chip input:checked + span { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.chip input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }
.chip-serif span { font-family: "Iowan Old Style", Georgia, serif; }
.chip-mono span { font-family: ui-monospace, Menlo, Consolas, monospace; }
.chip-dyslexic span { font-family: "OpenDyslexic", "Atkinson Hyperlegible", Verdana, sans-serif; }

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  height: 1.8rem;
}

.toggles { display: grid; gap: .7rem; }
.switch { display: flex; align-items: center; gap: .6rem; font-size: .92rem; cursor: pointer; }
.switch input { width: 1.15rem; height: 1.15rem; accent-color: var(--accent); }

.shortcuts summary { cursor: pointer; font-size: .88rem; color: var(--ink-soft); padding: .4rem 0; }
.shortcuts dl { display: grid; grid-template-columns: auto 1fr; gap: .4rem .9rem; margin: .6rem 0 0; font-size: .85rem; }
.shortcuts dt { margin: 0; }
.shortcuts dd { margin: 0; color: var(--ink-soft); }
kbd {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: .8em;
  border: 1px solid var(--rule);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: .1rem .35rem;
  background: var(--bg);
}

.settings-actions {
  display: flex;
  justify-content: space-between;
  gap: .7rem;
  padding-top: .4rem;
  border-top: 1px solid var(--rule);
  margin-top: 1.4rem;
  padding-top: 1.2rem;
}

/* --- responsive ----------------------------------------------------------- */

@media (max-width: 640px) {
  .header-inner { padding: .6rem 0; }
  .brand-text small { display: none; }
  .settings-button span { display: none; }
  .settings-button { padding: .5rem; }
  .chapter-card { grid-template-columns: auto 1fr; gap: .9rem; padding: .9rem 1rem; }
  .chapter-arrow { display: none; }
  .chapter-nav { grid-template-columns: 1fr; }
  .nav-card.next { text-align: start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}
:root[data-calm="on"] *, :root[data-calm="on"] *::before, :root[data-calm="on"] *::after {
  animation: none !important;
  transition: none !important;
}

/* --- print ---------------------------------------------------------------- */

@media print {
  .site-header, .site-footer, .chapter-nav, .progress-wrap, .settings-dialog, .crumbs, .skip-link { display: none !important; }
  body { background: #fff; color: #000; }
  .prose { max-width: none; font-size: 11pt; line-height: 1.5; }
  .reader { padding: 0; }
  a { color: #000; text-decoration: none; }
}