/* ============================================================
   Ironshelf — EPUB Reader Styles
   ============================================================ */

/* --- Reader Theme Variables --- */
:root {
  --reader-bg-light: #ffffff;
  --reader-text-light: #1a1a1a;
  --reader-bg-sepia: #f4ecd8;
  --reader-text-sepia: #5b4636;
  --reader-bg-dark: #1a1a1a;
  --reader-text-dark: #d4d4d4;
  --reader-chrome-bg: rgba(15, 17, 21, 0.95);
  --reader-chrome-text: #e8e4da;
  --reader-chrome-border: rgba(255, 255, 255, 0.08);
  --reader-progress-color: #3BB3C9;
  --reader-transition: 200ms ease;
}

/* --- Full Viewport Container --- */
.reader-container {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  background: var(--reader-bg-dark);
  overflow: hidden;
}

/* --- Progress Bar (top thin line) --- */
.reader-progress-bar {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 10002;
  background: rgba(255, 255, 255, 0.05);
  pointer-events: none;
}

.reader-progress-bar-fill {
  height: 100%;
  background: var(--reader-progress-color);
  transition: width 300ms ease;
  will-change: width;
}

/* --- Chrome (Top + Bottom Bars) --- */
.reader-chrome {
  position: absolute;
  left: 0;
  right: 0;
  z-index: 10001;
  transition: transform var(--reader-transition), opacity var(--reader-transition);
  pointer-events: auto;
}

.reader-chrome-top {
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--reader-chrome-bg);
  border-bottom: 1px solid var(--reader-chrome-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.reader-chrome-bottom {
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--reader-chrome-bg);
  border-top: 1px solid var(--reader-chrome-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.reader-chrome.hidden .reader-chrome-top {
  transform: translateY(-100%);
  opacity: 0;
}

.reader-chrome.hidden .reader-chrome-bottom {
  transform: translateY(100%);
  opacity: 0;
}

.reader-chrome-hidden .reader-chrome-top {
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

.reader-chrome-hidden .reader-chrome-bottom {
  transform: translateY(100%);
  opacity: 0;
  pointer-events: none;
}

/* --- Chrome Elements --- */
.reader-title {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 500;
  color: var(--reader-chrome-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 50vw;
  flex: 1;
  text-align: center;
  padding: 0 12px;
}

.reader-chrome-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--reader-chrome-text);
  cursor: pointer;
  transition: background var(--reader-transition);
  flex-shrink: 0;
}

.reader-chrome-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

.reader-chrome-btn:focus-visible {
  outline: 2px solid var(--reader-progress-color);
  outline-offset: 2px;
}

.reader-chrome-btn svg {
  width: 20px;
  height: 20px;
}

.reader-chrome-left,
.reader-chrome-right {
  display: flex;
  align-items: center;
  gap: 4px;
}

.reader-bottom-info {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
  justify-content: center;
}

.reader-bottom-info span {
  font-family: 'Inter', sans-serif;
  font-size: 12px;
  color: rgba(228, 224, 218, 0.7);
  white-space: nowrap;
}

.reader-chapter-name {
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* --- Reading Area --- */
.reader-viewport {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.reader-viewport-inner {
  width: 100%;
  height: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 20px;
  box-sizing: border-box;
}

/* --- Navigation Zones (click/tap areas) --- */
.reader-nav-zone {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 25%;
  z-index: 5;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.reader-nav-zone-left {
  left: 0;
}

.reader-nav-zone-right {
  right: 0;
}

.reader-nav-zone:active {
  background: rgba(255, 255, 255, 0.02);
}

/* --- Arrow Indicators (desktop) --- */
.reader-nav-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(15, 17, 21, 0.7);
  color: rgba(228, 224, 218, 0.8);
  opacity: 0;
  transition: opacity var(--reader-transition);
  pointer-events: none;
  z-index: 6;
}

.reader-nav-arrow svg {
  width: 22px;
  height: 22px;
}

.reader-nav-arrow-left {
  left: 16px;
}

.reader-nav-arrow-right {
  right: 16px;
}

.reader-viewport:hover .reader-nav-arrow {
  opacity: 1;
}

@media (max-width: 768px) {
  .reader-nav-arrow {
    display: none;
  }
}

/* --- TOC Sidebar --- */
.reader-toc-overlay {
  position: fixed;
  inset: 0;
  z-index: 10003;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity var(--reader-transition);
  pointer-events: none;
}

.reader-toc-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

.reader-toc {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 320px;
  max-width: 85vw;
  z-index: 10004;
  background: var(--reader-chrome-bg);
  border-right: 1px solid var(--reader-chrome-border);
  transform: translateX(-100%);
  transition: transform 250ms ease;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.reader-toc.visible {
  transform: translateX(0);
}

.reader-toc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid var(--reader-chrome-border);
  flex-shrink: 0;
}

.reader-toc-header h3 {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--reader-chrome-text);
  margin: 0;
}

.reader-toc-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
  -webkit-overflow-scrolling: touch;
}

.reader-toc-item {
  display: block;
  width: 100%;
  padding: 10px 16px;
  border: none;
  background: transparent;
  color: rgba(228, 224, 218, 0.8);
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  text-align: left;
  cursor: pointer;
  transition: background var(--reader-transition), color var(--reader-transition);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.reader-toc-item:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--reader-chrome-text);
}

.reader-toc-item:focus-visible {
  outline: 2px solid var(--reader-progress-color);
  outline-offset: -2px;
}

.reader-toc-item.active {
  color: var(--reader-progress-color);
  background: rgba(59, 179, 201, 0.08);
  font-weight: 500;
}

.reader-toc-item[data-level="1"] { padding-left: 16px; }
.reader-toc-item[data-level="2"] { padding-left: 32px; font-size: 12px; }
.reader-toc-item[data-level="3"] { padding-left: 48px; font-size: 12px; }

/* --- Settings Panel --- */
.reader-settings-panel {
  position: absolute;
  bottom: 56px;
  right: 16px;
  z-index: 10002;
  background: var(--reader-chrome-bg);
  border: 1px solid var(--reader-chrome-border);
  border-radius: 12px;
  padding: 16px;
  min-width: 220px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transform: translateY(8px);
  opacity: 0;
  transition: transform var(--reader-transition), opacity var(--reader-transition);
  pointer-events: none;
}

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

.reader-settings-group {
  margin-bottom: 16px;
}

.reader-settings-group:last-child {
  margin-bottom: 0;
}

.reader-settings-label {
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: rgba(228, 224, 218, 0.5);
  margin-bottom: 8px;
}

.reader-font-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.reader-font-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  background: transparent;
  color: var(--reader-chrome-text);
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--reader-transition), border-color var(--reader-transition);
}

.reader-font-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.25);
}

.reader-font-size-display {
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  color: var(--reader-chrome-text);
  min-width: 32px;
  text-align: center;
}

.reader-theme-options {
  display: flex;
  gap: 8px;
}

.reader-theme-btn {
  flex: 1;
  padding: 8px;
  border: 2px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  font-size: 11px;
  font-weight: 500;
  text-align: center;
  transition: border-color var(--reader-transition);
}

.reader-theme-btn-light {
  background: #ffffff;
  color: #1a1a1a;
}

.reader-theme-btn-sepia {
  background: #f4ecd8;
  color: #5b4636;
}

.reader-theme-btn-dark {
  background: #1a1a1a;
  color: #d4d4d4;
  border-color: rgba(255, 255, 255, 0.15);
}

.reader-theme-btn.active {
  border-color: var(--reader-progress-color);
}

/* --- Loading State --- */
.reader-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: var(--reader-bg-dark);
  z-index: 10;
}

.reader-loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(59, 179, 201, 0.2);
  border-top-color: var(--reader-progress-color);
  border-radius: 50%;
  animation: reader-spin 0.8s linear infinite;
}

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

.reader-loading-text {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  color: rgba(228, 224, 218, 0.7);
}

/* --- Error State --- */
.reader-error {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--reader-bg-dark);
  z-index: 10;
  padding: 24px;
  text-align: center;
}

.reader-error-icon {
  width: 48px;
  height: 48px;
  color: #ef4444;
}

.reader-error-icon svg {
  width: 100%;
  height: 100%;
}

.reader-error-title {
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  font-weight: 600;
  color: var(--reader-chrome-text);
}

.reader-error-message {
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  color: rgba(228, 224, 218, 0.6);
  max-width: 400px;
}

.reader-error-btn {
  margin-top: 8px;
  padding: 8px 20px;
  border: none;
  border-radius: 8px;
  background: var(--reader-progress-color);
  color: #fff;
  font-family: 'Inter', sans-serif;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity var(--reader-transition);
}

.reader-error-btn:hover {
  opacity: 0.85;
}

/* --- Theme Application to epub content --- */
.reader-theme-light .reader-viewport {
  background: var(--reader-bg-light);
}

.reader-theme-sepia .reader-viewport {
  background: var(--reader-bg-sepia);
}

.reader-theme-dark .reader-viewport {
  background: var(--reader-bg-dark);
}

/* --- "Read" Button on Book Detail --- */
.btn-read {
  background: var(--reader-progress-color);
  color: #fff;
  border: none;
}

.btn-read:hover {
  background: #2da0b5;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .reader-viewport-inner {
    padding: 48px 12px;
    max-width: 100%;
  }

  .reader-chrome-top {
    padding: 10px 12px;
  }

  .reader-chrome-bottom {
    padding: 8px 12px;
  }

  .reader-title {
    font-size: 13px;
    max-width: 40vw;
  }

  .reader-bottom-info span {
    font-size: 11px;
  }

  .reader-bottom-info {
    gap: 10px;
  }

  .reader-settings-panel {
    right: 8px;
    left: 8px;
    min-width: unset;
  }

  .reader-nav-zone {
    width: 30%;
  }
}

@media (max-width: 480px) {
  .reader-chapter-name {
    display: none;
  }
}

/* --- Fullscreen tweaks --- */
.reader-container:fullscreen .reader-viewport-inner,
.reader-container:-webkit-full-screen .reader-viewport-inner {
  max-width: 700px;
}