:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --reader-bg: #eee6cb;
  --reader-panel: rgba(255, 255, 255, 0.72);
  --reader-text: #201d17;
  --reader-muted: #625d52;
  --reader-border: rgba(57, 52, 42, 0.22);
  --reader-active: #dce8d5;
  --reader-page-bg: #fffdf6;
  --reader-shadow: 0 18px 55px rgba(48, 43, 31, 0.18);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --reader-bg: #111713;
  --reader-panel: rgba(27, 36, 30, 0.9);
  --reader-text: #f1f3ec;
  --reader-muted: #b9c2b8;
  --reader-border: rgba(190, 212, 192, 0.24);
  --reader-active: #31513c;
  --reader-page-bg: #171b18;
  --reader-shadow: 0 18px 55px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  overflow: hidden;
  background: var(--reader-bg);
  color: var(--reader-text);
}

button,
a {
  font: inherit;
}

button {
  min-height: 44px;
  padding: 0.62rem 0.9rem;
  border: 1px solid var(--reader-border);
  border-radius: 999px;
  background: var(--reader-panel);
  color: inherit;
  font-weight: 700;
  cursor: pointer;
}

button:hover,
button:focus-visible {
  background: var(--reader-active);
}

button[aria-pressed="true"] {
  border-color: currentColor;
  background: var(--reader-active);
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid currentColor;
  outline-offset: 3px;
}

button:disabled {
  opacity: 0.42;
  cursor: not-allowed;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.7rem 1rem;
  border-radius: 0.4rem;
  background: var(--reader-text);
  color: var(--reader-bg);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.reader-app {
  display: grid;
  height: 100vh;
  grid-template-rows: auto minmax(0, 1fr) auto;
}

.reader-header {
  display: grid;
  justify-items: center;
  gap: 0.72rem;
  padding: 0.85rem clamp(0.7rem, 2vw, 1.25rem) 0.95rem;
  border-bottom: 1px solid var(--reader-border);
  background: var(--reader-panel);
  backdrop-filter: blur(18px);
}

.reader-current {
  display: grid;
  justify-items: center;
  gap: 0.12rem;
  max-width: 60rem;
  text-align: center;
}

.reader-current__book {
  margin: 0;
  color: var(--reader-muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.reader-current__title {
  margin: 0;
  font-size: clamp(1.08rem, 2.3vw, 1.55rem);
  line-height: 1.2;
  text-wrap: balance;
}

.reader-position {
  color: var(--reader-muted);
  font-size: 0.86rem;
  font-weight: 700;
  text-align: center;
}

.reader-navigation,
.reader-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
}

.reader-tools button {
  min-height: 40px;
  padding-block: 0.48rem;
}

.reader-stage {
  min-height: 0;
  padding: clamp(0.5rem, 1.4vw, 1rem);
}

.book-frame {
  display: block;
  width: 100%;
  height: 100%;
  border: 1px solid var(--reader-border);
  border-radius: 0.8rem;
  background: var(--reader-page-bg);
  box-shadow: var(--reader-shadow);
}

.reader-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.4rem 1rem;
  padding: 0.55rem 0.9rem;
  border-top: 1px solid var(--reader-border);
  color: var(--reader-muted);
  font-size: 0.76rem;
}

.reader-footer p {
  margin: 0;
}

.toc-dialog {
  width: min(92vw, 720px);
  max-height: min(86vh, 900px);
  padding: 0;
  border: 1px solid var(--reader-border);
  border-radius: 1rem;
  background: var(--reader-bg);
  color: var(--reader-text);
  box-shadow: var(--reader-shadow);
}

.toc-dialog::backdrop {
  background: rgba(0, 0, 0, 0.56);
}

.toc-dialog__header {
  position: sticky;
  z-index: 1;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem;
  border-bottom: 1px solid var(--reader-border);
  background: var(--reader-bg);
}

.toc-dialog h1,
.toc-dialog h2 {
  margin: 0;
}

.toc-dialog section {
  padding: 1rem;
}

.toc-dialog section + section {
  border-top: 1px solid var(--reader-border);
}

.toc-list,
.page-list {
  display: grid;
  gap: 0.45rem;
  margin: 0;
  padding-left: 1.5rem;
}

.toc-list button,
.page-list button {
  width: 100%;
  justify-content: flex-start;
  border-radius: 0.5rem;
  text-align: left;
}

@media (max-width: 560px) {
  .reader-header {
    max-height: 44vh;
    overflow-y: auto;
  }

  .reader-navigation,
  .reader-tools {
    width: 100%;
  }

  .reader-navigation button {
    flex: 1 1 9rem;
  }

  .reader-footer {
    display: none;
  }
}

@media (prefers-reduced-motion: no-preference) {
  button,
  .skip-link {
    transition: background-color 140ms ease, transform 140ms ease;
  }
}

@media print {
  body {
    display: none !important;
  }
}