:root {
  --bg: #0f0f14;
  --panel: #171722;
  --text: #f2f2f4;
  --muted: #b7b7c2;
  --accent: #2aa6a1;
  --danger: #e26d6d;
  --border: #2b2b3a;
  --font-size: 100;
  --line-height: 1.8;
  --letter-spacing: 0px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.6;
}

body.theme-light {
  --bg: #f6f6f8;
  --panel: #ffffff;
  --text: #14141a;
  --muted: #5d5d6d;
  --accent: #2a6aa6;
  --danger: #c74c4c;
  --border: #d7d7e2;
}

body.theme-dark {
  --bg: #0f0f14;
  --panel: #171722;
  --text: #f2f2f4;
  --muted: #b7b7c2;
  --accent: #2aa6a1;
  --danger: #e26d6d;
  --border: #2b2b3a;
}

.app-root {
  min-height: 100%;
}

.screen {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

[hidden] {
  display: none !important;
}

body.site-mode-distribution [data-manual-import],
body.site-mode-distribution [data-export-control] {
  display: none !important;
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
  padding: 32px 0 48px;
}

h1, h2, h3 {
  font-weight: 600;
  letter-spacing: 0.02em;
}

.button {
  background: var(--accent);
  color: #061010;
  border: none;
  border-radius: 999px;
  padding: 10px 16px;
  cursor: pointer;
  font-weight: 600;
}

.button.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
}

.status {
  margin-top: 12px;
  font-size: 14px;
}

.status.ok {
  color: #2f8f45;
}

.status.error {
  color: var(--danger);
}

.label {
  display: block;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 6px;
}

.input {
  width: 100%;
  background: color-mix(in srgb, var(--panel), #000 8%);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 10px;
}

select.input {
  background: color-mix(in srgb, var(--panel), #000 4%);
}

select.input option {
  color: #14141a;
  background: #ffffff;
}

.grid {
  display: grid;
  gap: 16px;
}

#helpScreen {
  min-height: 100dvh;
  overflow-y: auto;
  overscroll-behavior-y: contain;
  -webkit-overflow-scrolling: touch;
}

#helpScreen .help-container {
  width: min(960px, 92vw);
}

#helpScreen .help-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: start;
}

#helpScreen .help-header-copy h1 {
  margin: 0;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  line-height: 1.2;
}

#helpScreen .help-summary {
  margin: 10px 0 0;
  color: var(--muted);
}

#helpScreen .help-header-actions {
  display: flex;
  justify-content: flex-end;
}

#helpScreen .help-layout {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

#helpScreen .help-card {
  display: grid;
  gap: 8px;
}

#helpScreen .help-card .label {
  margin-bottom: 0;
}

#helpScreen .help-list {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 6px;
}

#helpScreen code {
  background: color-mix(in srgb, var(--panel), #000 10%);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.05em 0.35em;
}

/* Compact spacing for the library screen while keeping safe tap targets. */
#libraryScreen .container {
  padding: 16px 0 24px;
}

#libraryScreen .library-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

#libraryScreen .library-header h1 {
  margin: 0;
  font-size: 1.45rem;
  line-height: 1.2;
}

.version-badge {
  display: inline-flex;
  align-items: center;
  min-height: 1.6rem;
  padding: 0.12rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

#libraryScreen {
  min-height: 100dvh;
  overflow-y: auto;
  overscroll-behavior-y: contain;
}

#libraryScreen .status {
  margin-top: 4px;
  line-height: 1.35;
}

#libraryScreen .library-grid {
  display: grid;
  margin-top: 6px;
  gap: 10px;
}

#libraryScreen .library-column {
  display: grid;
  gap: 10px;
  align-content: start;
}

#libraryScreen .card {
  padding: 12px;
}

#libraryScreen .label {
  margin-bottom: 4px;
  line-height: 1.3;
}

#libraryScreen .input {
  min-height: 40px;
  padding: 8px 10px;
}

#libraryScreen .button {
  min-height: 40px;
  padding: 8px 14px;
}

#libraryScreen .library-card-stack {
  display: grid;
  gap: 8px;
}

#libraryScreen .library-toolbar-card {
  align-content: start;
}

#libraryScreen #bundledBooksCard {
  gap: 8px;
}

#libraryScreen .book-card {
  display: grid;
  grid-template-columns: minmax(80px, 0.32fr) minmax(0, 1fr);
  gap: 12px;
  align-items: stretch;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: color-mix(in srgb, var(--panel), #000 4%);
}

#libraryScreen .book-cover {
  min-width: 0;
  aspect-ratio: 2 / 3;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: color-mix(in srgb, var(--panel), #000 10%);
}

#libraryScreen .book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  -webkit-user-drag: none;
}

#libraryScreen .book-cover-placeholder {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  padding: 8px;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.3;
  text-align: center;
}

#libraryScreen .book-info {
  display: grid;
  gap: 7px;
  align-content: start;
  min-width: 0;
}

#libraryScreen .book-title {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

#libraryScreen .book-author,
#libraryScreen .book-description,
#libraryScreen .book-updated {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

#libraryScreen .book-read-button {
  justify-self: start;
  min-width: 6rem;
}

#libraryScreen .bundled-book-button {
  appearance: none;
  -webkit-appearance: none;
  box-sizing: border-box;
  width: 100%;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
  justify-content: flex-start;
  text-align: left;
  white-space: normal;
  padding: 12px 14px;
  border-radius: 14px;
  background: color-mix(in srgb, var(--panel), #000 4%);
  transition: transform 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}

#libraryScreen .bundled-book-button:hover,
#libraryScreen .bundled-book-button:focus-visible {
  border-color: color-mix(in srgb, var(--accent), var(--border) 35%);
  background: color-mix(in srgb, var(--panel), var(--accent) 10%);
  transform: translateY(-1px);
  outline: none;
}

#libraryScreen .bundled-book-index {
  display: inline-grid;
  place-items: center;
  min-width: 2.25rem;
  min-height: 2.25rem;
  padding: 0 0.35rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

#libraryScreen .bundled-book-meta {
  display: grid;
  gap: 3px;
  min-width: 0;
}

#libraryScreen .bundled-book-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-width: 0;
}

#libraryScreen .bundled-book-kind {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 1.5rem;
  padding: 0.1rem 0.55rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  background: color-mix(in srgb, var(--accent), transparent 80%);
  color: var(--text);
  border: 1px solid color-mix(in srgb, var(--accent), var(--border) 40%);
}

#libraryScreen .bundled-book-kind.kind-txt {
  background: color-mix(in srgb, #c28d2f, transparent 82%);
  border-color: color-mix(in srgb, #c28d2f, var(--border) 42%);
}

#libraryScreen .bundled-book-kind.kind-epub {
  background: color-mix(in srgb, #2a8f71, transparent 82%);
  border-color: color-mix(in srgb, #2a8f71, var(--border) 42%);
}

#libraryScreen .bundled-book-kind.kind-html {
  background: color-mix(in srgb, #2a6aa6, transparent 82%);
  border-color: color-mix(in srgb, #2a6aa6, var(--border) 42%);
}

#libraryScreen .bundled-book-kind.kind-zip {
  background: color-mix(in srgb, #7b4db8, transparent 82%);
  border-color: color-mix(in srgb, #7b4db8, var(--border) 42%);
}

#libraryScreen .bundled-book-action {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
}

#libraryScreen .bundled-book-title {
  display: block;
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.35;
  overflow-wrap: anywhere;
  word-break: break-word;
}

#libraryScreen .bundled-book-note {
  display: block;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.35;
  overflow-wrap: anywhere;
  word-break: break-word;
}

#libraryScreen .bundled-book-file {
  display: block;
  color: color-mix(in srgb, var(--muted), var(--text) 18%);
  font-size: 0.78rem;
  line-height: 1.3;
  overflow-wrap: anywhere;
  word-break: break-word;
}

#libraryScreen #bundledBooksList {
  max-height: min(52dvh, 480px);
  overflow-y: auto;
  overscroll-behavior-y: contain;
  padding-right: 2px;
  gap: 10px;
}

.copyright-footer {
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.4;
}

#libraryScreen .copyright-footer {
  margin-top: 14px;
  text-align: center;
}

@media (min-width: 900px) {
  #libraryScreen .library-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (max-width: 899px) {
  #helpScreen .container {
    width: min(100vw - 16px, 680px);
    padding: 12px 0 20px;
  }

  #helpScreen .help-header {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  #helpScreen .help-header-actions {
    justify-content: stretch;
  }

  #helpScreen .help-header-actions .button {
    width: 100%;
  }

  #helpScreen .help-layout {
    gap: 8px;
    margin-top: 8px;
  }

  #libraryScreen .container {
    width: min(100vw - 16px, 680px);
    padding: 8px 0 16px;
  }

  #libraryScreen .library-header {
    align-items: flex-start;
    margin-bottom: 8px;
  }

  #libraryScreen .library-header h1 {
    font-size: 1.18rem;
  }

  #libraryScreen .library-grid {
    gap: 8px;
  }

  #libraryScreen .library-column {
    gap: 8px;
  }

  #libraryScreen .card {
    padding: 10px;
    border-radius: 14px;
  }

  #libraryScreen .label {
    font-size: 13px;
    margin-bottom: 2px;
  }

  #libraryScreen .status {
    margin-top: 0;
    font-size: 13px;
  }

  #libraryScreen .button {
    min-height: 38px;
    padding: 7px 12px;
  }

  #libraryScreen .book-card {
    grid-template-columns: 82px minmax(0, 1fr);
    gap: 10px;
    padding: 10px;
    border-radius: 10px;
  }

  #libraryScreen .book-title {
    font-size: 0.98rem;
  }

  #libraryScreen .book-author,
  #libraryScreen .book-description,
  #libraryScreen .book-updated {
    font-size: 0.78rem;
    line-height: 1.28;
  }

  #libraryScreen .bundled-book-button {
    grid-template-columns: minmax(1.9rem, auto) minmax(0, 1fr);
    gap: 10px;
    padding: 10px 12px;
  }

  #libraryScreen .bundled-book-topline {
    align-items: start;
    flex-wrap: wrap;
    gap: 6px;
  }

  #libraryScreen .bundled-book-action {
    align-self: start;
    font-size: 0.78rem;
  }

  #libraryScreen .bundled-book-title {
    font-size: 0.96rem;
    line-height: 1.28;
  }

  #libraryScreen .bundled-book-note,
  #libraryScreen .bundled-book-file {
    font-size: 0.78rem;
    line-height: 1.22;
  }

  #libraryScreen .bundled-book-index {
    min-width: 2rem;
    min-height: 2rem;
    font-size: 0.76rem;
  }

  #libraryScreen #bundledBooksList {
    max-height: min(46dvh, 360px);
    gap: 8px;
  }
}