:root {
  color-scheme: dark;
  --background: #08060d;
  --surface: rgba(17, 13, 25, 0.9);
  --surface-raised: #171120;
  --ink: #f1eaf7;
  --muted: #978da4;
  --violet: #ab79d6;
  --violet-bright: #d4aeef;
  --line: rgba(193, 145, 224, 0.18);
  --reader-width: 920px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scrollbar-color: #5f3b73 var(--background);
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 50% 8%, rgba(103, 59, 127, 0.17), transparent 27rem),
    linear-gradient(180deg, #0d0913 0, var(--background) 32rem);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.18'/%3E%3C/svg%3E");
  content: "";
  opacity: 0.11;
  pointer-events: none;
}

button,
select {
  color: inherit;
  font: inherit;
}

button,
select,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 2px solid var(--violet-bright);
  outline-offset: 4px;
}

.ambient {
  position: fixed;
  z-index: -1;
  width: 28rem;
  height: 28rem;
  border-radius: 50%;
  background: rgba(103, 54, 131, 0.1);
  filter: blur(100px);
  pointer-events: none;
}

.ambient-left {
  top: 35vh;
  left: -20rem;
}

.ambient-right {
  right: -20rem;
  bottom: 10vh;
}

.reader-toolbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  min-height: 76px;
  padding: 12px clamp(18px, 4vw, 64px);
  border-bottom: 1px solid var(--line);
  background: rgba(9, 7, 14, 0.84);
  box-shadow: 0 16px 35px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(20px);
}

.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  width: fit-content;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.2rem, 2vw, 1.55rem);
  font-weight: 700;
  line-height: 0.9;
  text-decoration: none;
}

.brand small,
.nav-button small {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.58rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(199, 150, 231, 0.3);
  border-radius: 50%;
  place-items: center;
  color: var(--violet-bright);
  box-shadow: inset 0 0 18px rgba(154, 93, 191, 0.14), 0 0 20px rgba(128, 69, 164, 0.1);
}

.chapter-picker {
  display: flex;
  gap: 12px;
  align-items: center;
}

.chapter-picker label,
.progress-copy span {
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

select {
  min-width: 134px;
  padding: 10px 36px 10px 14px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: #15101d;
  cursor: pointer;
}

.progress-copy {
  display: flex;
  gap: 12px;
  align-items: baseline;
  min-width: 148px;
  margin-left: 36px;
  justify-content: flex-end;
}

.progress-copy strong {
  color: var(--violet-bright);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.25rem;
}

.progress-track {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  overflow: hidden;
}

.progress-track span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, #70438e, #d4aeef);
  box-shadow: 0 0 10px #b57ed7;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 120ms linear;
}

.chapter-heading {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding: clamp(70px, 12vw, 130px) 20px clamp(45px, 8vw, 85px);
  text-align: center;
}

.chapter-heading p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.chapter-heading h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3.4rem, 10vw, 6rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 0.95;
  text-shadow: 0 0 45px rgba(177, 112, 213, 0.22);
}

.chapter-heading .scroll-hint {
  margin: 32px 0 0;
  font-size: 0.58rem;
}

.chapter-moon {
  position: absolute;
  top: 28%;
  right: 5%;
  z-index: -1;
  color: rgba(190, 137, 221, 0.08);
  font-size: 9rem;
  filter: blur(1px);
}

.ornament {
  display: block;
  width: 72px;
  height: 1px;
  margin: 0 auto 28px;
  background: linear-gradient(90deg, transparent, var(--violet), transparent);
  box-shadow: 0 0 12px rgba(172, 106, 209, 0.7);
}

.reader {
  width: min(100%, var(--reader-width));
  min-height: 60vh;
  margin: 0 auto;
  background: #111;
  box-shadow: 0 0 0 1px rgba(212, 174, 239, 0.08), 0 35px 90px rgba(0, 0, 0, 0.55), 0 0 80px rgba(109, 59, 137, 0.1);
}

.reader-page {
  position: relative;
  min-height: 240px;
  margin: 0;
  background: #111;
}

.reader-page.is-loading::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 26px;
  height: 26px;
  border: 2px solid rgba(181, 126, 215, 0.18);
  border-top-color: var(--violet);
  border-radius: 50%;
  content: "";
  animation: spin 0.8s linear infinite;
}

.reader-page img {
  display: block;
  width: 100%;
  height: auto;
}

.reader-page.has-error {
  display: grid;
  min-height: 360px;
  color: var(--muted);
  background: #110e16;
  place-items: center;
}

.reader-page.has-error figcaption::before {
  display: block;
  margin-bottom: 16px;
  color: var(--violet);
  font-size: 2rem;
  text-align: center;
  content: "☾";
}

.chapter-navigation {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 20px;
  align-items: center;
  width: min(calc(100% - 36px), var(--reader-width));
  margin: clamp(60px, 10vw, 110px) auto 0;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.nav-button,
.top-button {
  border: 0;
  background: transparent;
  cursor: pointer;
}

.nav-button {
  display: flex;
  gap: 18px;
  align-items: center;
  width: fit-content;
  padding: 12px 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.25rem;
  text-align: left;
}

.nav-button > span[aria-hidden] {
  color: var(--violet);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  transition: transform 180ms ease;
}

.nav-button:not(:disabled):hover > span[aria-hidden] {
  transform: translateX(-5px);
}

.nav-button-next {
  justify-self: end;
  text-align: right;
}

.nav-button-next:not(:disabled):hover > span[aria-hidden] {
  transform: translateX(5px);
}

.nav-button:disabled {
  opacity: 0.28;
  cursor: not-allowed;
}

.top-button {
  display: grid;
  width: 54px;
  height: 54px;
  border: 1px solid var(--line);
  border-radius: 50%;
  place-items: center;
  color: var(--violet-bright);
  font-size: 1.25rem;
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.top-button:hover {
  border-color: rgba(201, 156, 229, 0.55);
  box-shadow: 0 0 28px rgba(147, 87, 181, 0.2);
  transform: translateY(-3px);
}

footer {
  display: grid;
  min-height: 220px;
  place-content: center;
  color: #665d70;
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-align: center;
  text-transform: uppercase;
}

footer span {
  color: #765188;
}

.noscript {
  position: fixed;
  right: 20px;
  bottom: 20px;
  left: 20px;
  z-index: 30;
  margin: 0;
  padding: 16px;
  border: 1px solid var(--line);
  background: var(--surface-raised);
  text-align: center;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 680px) {
  .reader-toolbar {
    grid-template-columns: 1fr auto;
    min-height: 68px;
    padding: 10px 16px;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
  }

  .brand small,
  .chapter-picker label,
  .progress-copy span {
    display: none;
  }

  .chapter-picker {
    grid-column: 2;
    grid-row: 1;
  }

  .progress-copy {
    position: absolute;
    right: 18px;
    bottom: -28px;
    min-width: 0;
    margin: 0;
    padding: 3px 8px;
    border: 1px solid var(--line);
    border-radius: 0 0 5px 5px;
    background: rgba(9, 7, 14, 0.92);
  }

  .progress-copy strong {
    font-size: 0.82rem;
  }

  select {
    min-width: 112px;
    padding-block: 8px;
  }

  .chapter-heading {
    padding-top: 80px;
  }

  .chapter-moon {
    right: -10%;
    font-size: 7rem;
  }

  .reader-page {
    min-height: 180px;
  }

  .chapter-navigation {
    grid-template-columns: 1fr auto 1fr;
    gap: 8px;
  }

  .nav-button {
    gap: 8px;
    font-size: 0.96rem;
  }

  .nav-button small {
    display: none;
  }

  .top-button {
    width: 44px;
    height: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}