/* ─── Reader Layout ─────────────────────────────────────────────── */

.reader-layout {
  display: flex;
  min-height: calc(100vh - var(--header-height));
  position: relative;
}

.reader-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* Progress bar */
.reader-progress-bar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 0%;
  height: 2px;
  background-color: var(--color-accent);
  z-index: 90;
  transition: width 0.3s ease;
}

/* Reading time indicator */
.reader-time-label {
  position: fixed;
  top: calc(var(--header-height) + 6px);
  right: var(--space-md);
  font-family: var(--font-ui);
  font-size: 0.7rem;
  color: var(--color-text-muted);
  opacity: 0;
  transition: opacity var(--transition-base);
  z-index: 90;
  pointer-events: none;
  letter-spacing: 0.02em;
}

.reader-time-label.visible {
  opacity: 1;
}

/* ─── Top bar (back link only) ───────────────────────────────────── */

.reader-topbar {
  display: flex;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  max-width: 66ch;
  width: 100%;
  margin: 0 auto;
}

.reader-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-ui);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  min-height: 44px;
}

.reader-back:hover {
  color: var(--color-accent);
}

/* ─── Fixed contents trigger (always visible) ────────────────────── */

.reader-contents-btn {
  position: fixed;
  top: calc(var(--header-height) + var(--space-sm));
  left: var(--space-sm);
  z-index: 170;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  box-shadow: 0 2px 8px color-mix(in srgb, #000 12%, transparent);
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.reader-contents-btn:hover,
.reader-contents-btn[aria-expanded="true"] {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: color-mix(in srgb, var(--color-accent) 6%, var(--color-bg));
}

/* ─── Book info ──────────────────────────────────────────────────── */

.reader-book-info {
  max-width: 66ch;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-lg) var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-xl);
}

.reader-book-title {
  font-family: var(--font-body);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
  margin-bottom: var(--space-xs);
}

.reader-book-author {
  font-family: var(--font-ui);
  font-size: var(--font-size-base);
  color: var(--color-text-muted);
}

/* ─── Article ────────────────────────────────────────────────────── */

.reader-article {
  font-family: var(--font-body);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.7;
  letter-spacing: 0.01em;
  color: var(--color-text);
  max-width: 66ch;
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-3xl);
  text-align: left;
}

/* ─── Jump to chapter button ─────────────────────────────────────── */

.reader-jump-btn {
  position: fixed;
  bottom: calc(var(--space-lg) + 52px + var(--space-sm));
  left: 50%;
  transform: translateX(-50%);
  z-index: 199;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  background-color: var(--color-accent);
  color: #fff;
  font-family: var(--font-ui);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 16px color-mix(in srgb, #000 30%, transparent);
  white-space: nowrap;
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.reader-jump-btn.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(8px);
}

/* Gutenberg HTML content styles */
.reader-article p {
  margin-bottom: 1.3em;
  text-indent: 0;
}

.reader-article h1,
.reader-article h2,
.reader-article h3,
.reader-article h4 {
  font-family: var(--font-ui);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
  margin-top: 4em;
  margin-bottom: 1em;
  text-align: center;
  scroll-margin-top: calc(var(--header-height) + 1rem);
}

.reader-article h1 { font-size: 1.4em; }
.reader-article h2 { font-size: 1.15em; letter-spacing: 0.04em; }
.reader-article h3 { font-size: 1em; letter-spacing: 0.06em; text-transform: uppercase; color: var(--color-text-muted); }
.reader-article h4 { font-size: 0.9em; color: var(--color-text-muted); }

.reader-article img {
  display: block;
  max-width: min(100%, 500px);
  height: auto;
  margin: var(--space-xl) auto;
  border-radius: var(--radius-sm);
  opacity: 0.92;
}

.reader-article blockquote {
  border-left: 3px solid var(--color-accent);
  margin: 1.5em 0;
  padding: 0.5em 1.5em;
  color: var(--color-text-muted);
  font-style: italic;
}

.reader-article pre {
  font-family: var(--font-body);
  white-space: pre-wrap;
  margin: 1.5em 0 1.5em 2em;
  font-style: italic;
}

.reader-article hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-2xl) 0;
}

/* Remove Gutenberg's inline link styles */
.reader-article a {
  color: var(--color-accent);
  text-decoration: none;
  background-color: transparent !important;
}

.reader-article table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.9em;
}

.reader-article td,
.reader-article th {
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  text-align: left;
}

/* Gutenberg figure/caption classes */
.reader-article .figcenter,
.reader-article .figleft,
.reader-article .figright {
  text-align: center;
  margin: var(--space-xl) auto var(--space-sm);
  clear: both;
  float: none;
}

.reader-article .caption,
.reader-article .caption p {
  font-size: 0.8em;
  font-family: var(--font-ui);
  color: var(--color-text-muted);
  text-align: center;
  font-style: italic;
  margin-bottom: var(--space-2xl);
  line-height: 1.4;
}

.reader-article .toc {
  border: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-xl) auto;
  max-width: 40ch;
  text-align: center;
  border-radius: var(--radius-md);
}

/* Override Gutenberg's body margin that bleeds into our article */
.reader-article > div[style],
.reader-article [style*="margin-left"],
.reader-article [style*="margin-right"] {
  margin-left: 0 !important;
  margin-right: 0 !important;
}

.reader-article .blk {
  margin: var(--space-xl) 0;
}

.reader-article .c,
.reader-article .cbig250 {
  text-align: center;
  text-indent: 0;
}

.reader-article .smcap {
  font-variant: small-caps;
}

.reader-article .letra {
  float: none;
  font-size: 1em;
  margin: 0;
}

/* Font size variants */
[data-font-size="small"] .reader-article { font-size: clamp(15px, 1.7vw, 17px); }
[data-font-size="large"] .reader-article { font-size: clamp(19px, 2.3vw, 23px); }

/* Line width variants */
[data-line-width="narrow"] .reader-article { max-width: 55ch; }
[data-line-width="wide"] .reader-article { max-width: 80ch; }
[data-line-width="narrow"] .reader-book-info { max-width: 55ch; }
[data-line-width="wide"] .reader-book-info { max-width: 80ch; }
[data-line-width="narrow"] .reader-topbar { max-width: 55ch; }
[data-line-width="wide"] .reader-topbar { max-width: 80ch; }

/* Font family variant */
[data-font="sans"] .reader-article {
  font-family: var(--font-ui);
  line-height: 1.65;
}

/* ─── Chapter Nav ────────────────────────────────────────────────── */

.chapter-nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background-color: color-mix(in srgb, #000 40%, transparent);
  z-index: 150;
}

.chapter-nav-backdrop.visible {
  display: block;
  animation: fade-in var(--transition-base) forwards;
}

.chapter-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: 0;
  width: min(300px, 85vw);
  background-color: var(--color-bg);
  border-right: 1px solid var(--color-border);
  z-index: 160;
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform var(--transition-base);
  overflow: hidden;
}

.chapter-nav.open {
  transform: translateX(0);
}

.chapter-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.chapter-nav-title {
  font-family: var(--font-ui);
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.chapter-nav-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  border-radius: var(--radius-pill);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.chapter-nav-close:hover {
  color: var(--color-text);
  background-color: var(--color-bg-subtle);
}

.chapter-nav-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md) 0;
  -webkit-overflow-scrolling: touch;
}

.chapter-nav-item {
  display: block;
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-ui);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.4;
  transition: color var(--transition-fast), background-color var(--transition-fast);
  min-height: 44px;
  display: flex;
  align-items: center;
}

.chapter-nav-item:hover {
  color: var(--color-text);
  background-color: var(--color-bg-subtle);
}

.chapter-nav-h1 { font-weight: 600; color: var(--color-text); }
.chapter-nav-h2 { padding-left: var(--space-lg); }
.chapter-nav-h3 { padding-left: calc(var(--space-lg) * 1.5); font-size: 0.8rem; }
.chapter-nav-h4 { padding-left: calc(var(--space-lg) * 2); font-size: 0.8rem; color: var(--color-text-muted); }

.chapter-nav-loading,
.chapter-nav-empty {
  padding: var(--space-lg);
  font-family: var(--font-ui);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ─── Reading Toolbar ────────────────────────────────────────────── */

.reader-toolbar-trigger {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 201;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  box-shadow: 0 2px 12px color-mix(in srgb, #000 20%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.reader-toolbar-trigger:hover {
  color: var(--color-accent);
  background-color: var(--color-bg-subtle);
  box-shadow: 0 4px 16px color-mix(in srgb, #000 25%, transparent);
}

.reader-toolbar {
  position: fixed;
  bottom: calc(var(--space-lg) + 52px);
  right: var(--space-lg);
  z-index: 200;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 24px color-mix(in srgb, #000 20%, transparent);
  padding: var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: 2px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px) scale(0.97);
  transition: opacity var(--transition-base), transform var(--transition-base);
  min-width: 120px;
}

.reader-toolbar.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.toolbar-btn {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  min-height: 40px;
  display: flex;
  align-items: center;
  font-family: var(--font-ui);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  text-align: left;
}

.toolbar-btn:hover {
  color: var(--color-text);
  background-color: var(--color-bg-subtle);
}

.toolbar-btn.active {
  color: var(--color-accent);
  background-color: color-mix(in srgb, var(--color-accent) 8%, var(--color-bg-subtle));
}

.toolbar-divider {
  height: 1px;
  background-color: var(--color-border);
  margin: var(--space-xs) 0;
}

/* ─── Reduced Motion ────────────────────────────────────────────── */

@media (prefers-reduced-motion: reduce) {
  .spinner { animation: none; opacity: 0.6; }
  .reader-toolbar { transition: opacity var(--transition-fast); transform: none; }
  .reader-progress-bar { transition: none; }
  .chapter-nav { transition: none; }
}

/* ─── Desktop ────────────────────────────────────────────────────── */

@media (min-width: 768px) {
  .reader-article {
    padding: 0 var(--space-xl) var(--space-3xl);
  }

  .reader-book-info {
    padding: var(--space-xl) var(--space-xl) var(--space-xl);
  }

  .reader-topbar {
    padding: var(--space-lg) var(--space-xl);
  }

  .reader-contents-btn {
    top: calc(var(--header-height) + var(--space-md));
    left: var(--space-md);
    width: 44px;
    height: 44px;
  }
}