/* ═══════════════════════════════════════════════════════
   Elegant Reader — Minimal & Refined
   ═══════════════════════════════════════════════════════ */

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* ─── Теми ─── */
:root {
  --bg: #0d0d0d;
  --bg-elevated: #1a1a1a;
  --text: #e8e4df;
  --text-muted: #888;
  --accent: #c9a55c;
  --accent-glow: rgba(201, 165, 92, 0.15);
  --border: rgba(255,255,255,0.08);
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
}

body.light {
  --bg: #faf9f7;
  --bg-elevated: #fff;
  --text: #2a2522;
  --text-muted: #888;
  --accent: #8b6914;
  --border: rgba(0,0,0,0.08);
  --shadow: 0 8px 32px rgba(0,0,0,0.08);
}

body.sepia {
  --bg: #f4ecd8;
  --bg-elevated: #faf6eb;
  --text: #3d3225;
  --text-muted: #7a6f5f;
  --accent: #8b5a2b;
  --border: rgba(0,0,0,0.06);
  --shadow: 0 8px 32px rgba(0,0,0,0.06);
}

/* ─── Base ─── */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Onest', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.4s ease, color 0.4s ease;
  -webkit-font-smoothing: antialiased;
}

/* ─── Cover Screen ─── */
.cover-screen {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.cover-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.cover-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 2rem;
  animation: fadeUp 0.8s ease-out;
}

.cover-image {
  max-width: 280px;
  max-height: 420px;
  width: auto;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  margin-bottom: 2.5rem;
  transition: transform 0.3s ease;
}

.cover-image:hover {
  transform: scale(1.02);
}

.cover-title {
  font-family: 'Onest', sans-serif;
  font-size: 2rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.cover-author {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.cover-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  background: var(--accent);
  border: none;
  border-radius: 50px;
  color: #fff;
  font-family: 'Onest', sans-serif;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.cover-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(201, 165, 92, 0.3);
}

.cover-btn svg {
  transition: transform 0.3s ease;
}

.cover-btn:hover svg {
  transform: translateX(4px);
}

@media (max-width: 600px) {
  .cover-image {
    max-width: 200px;
    max-height: 300px;
  }
  
  .cover-title {
    font-size: 1.6rem;
  }
}

/* ─── Header ─── */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 52px;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(to bottom, var(--bg) 60%, transparent);
  z-index: 100;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 0.3s, transform 0.3s;
}

.header.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  transition: color 0.2s;
}

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

.title {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'Onest', sans-serif;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
  max-width: 40%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.controls {
  display: flex;
  gap: 0.5rem;
}

.ctrl-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

.ctrl-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-glow);
}

/* ─── Progress ─── */
.progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), #e8c87a);
  z-index: 101;
  transition: width 0.3s ease-out;
}

/* ─── Main Content ─── */
.main {
  max-width: 680px;
  margin: 0 auto;
  padding: 6rem 1.5rem 4rem;
  min-height: 100vh;
}

/* ─── Chapter ─── */
.chapter {
  animation: fadeUp 0.6s ease-out;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.chapter-title {
  font-family: 'Onest', sans-serif;
  font-size: 2rem;
  font-weight: 600;
  color: var(--text);
  text-align: center;
  margin-bottom: 3rem;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.chapter-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 2px;
  background: var(--accent);
  margin: 1.5rem auto 0;
  border-radius: 1px;
}

.chapter-text {
  font-family: 'Literata', Georgia, serif;
  font-size: 1.25rem;
  line-height: 1.9;
  color: var(--text);
  text-align: justify;
  hyphens: auto;
  -webkit-hyphens: auto;
}

.chapter-text p {
  margin-bottom: 1.5em;
  text-indent: 1.5em;
}

.chapter-text p:first-of-type {
  text-indent: 0;
}

.chapter-text p:first-of-type::first-letter {
  font-size: 3.5em;
  float: left;
  line-height: 0.85;
  margin: 0.05em 0.12em 0 0;
  color: var(--accent);
  font-weight: 600;
}

/* Розміри тексту */
body.font-s .chapter-text { font-size: 1.1rem; line-height: 1.85; }
body.font-m .chapter-text { font-size: 1.25rem; line-height: 1.9; }
body.font-l .chapter-text { font-size: 1.45rem; line-height: 1.95; }

/* ─── Navigation ─── */
.nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.nav-btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.25s ease;
}

.nav-btn:hover:not(:disabled) {
  color: var(--accent);
  border-color: var(--accent);
  transform: scale(1.08);
}

.nav-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

.nav-info {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-width: 60px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* ─── Loading ─── */
.loading {
  display: flex;
  gap: 6px;
  justify-content: center;
  padding: 8rem 0;
}

.loading-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 1.2s ease-in-out infinite;
}

.loading-dot:nth-child(2) { animation-delay: 0.15s; }
.loading-dot:nth-child(3) { animation-delay: 0.3s; }

@keyframes pulse {
  0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
  40% { opacity: 1; transform: scale(1); }
}

/* ─── Overlay ─── */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 200;
}

.overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ─── Table of Contents ─── */
.toc {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 320px;
  max-width: 85vw;
  background: var(--bg-elevated);
  border-right: 1px solid var(--border);
  transform: translateX(-100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 201;
  display: flex;
  flex-direction: column;
}

.toc.active {
  transform: translateX(0);
}

.toc-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.toc-header h2 {
  font-family: 'Onest', sans-serif;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
}

.close-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s;
}

.close-btn:hover {
  color: var(--accent);
  background: var(--accent-glow);
}

.toc-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem;
}

.toc-item {
  padding: 0.85rem 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.toc-item:hover {
  background: var(--accent-glow);
}

.toc-item.active {
  background: var(--accent-glow);
  color: var(--accent);
}

.toc-num {
  font-size: 0.75rem;
  color: var(--text-muted);
  min-width: 20px;
}

.toc-title {
  font-size: 0.95rem;
  font-weight: 400;
}

/* ─── Download Popup ─── */
.download-popup {
  position: fixed;
  top: 60px;
  right: 5.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.75rem;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px) scale(0.96);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 150;
  min-width: 220px;
}

.download-popup.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.download-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0.5rem 0.75rem;
  margin-bottom: 0.25rem;
}

.download-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.download-item:hover {
  background: var(--accent-glow);
  color: var(--accent);
}

.download-item svg {
  flex-shrink: 0;
  opacity: 0.7;
}

.download-item:hover svg {
  opacity: 1;
}

.download-item .external-icon {
  margin-left: auto;
  opacity: 0.4;
}

.download-item:hover .external-icon {
  opacity: 0.7;
}

.download-divider {
  height: 1px;
  background: var(--border);
  margin: 0.5rem 0;
}

/* ─── Copyright Modal ─── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  z-index: 300;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 16px;
  width: 100%;
  max-width: 500px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
  transform: translateY(20px) scale(0.95);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.active .modal {
  transform: translateY(0) scale(1);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-family: 'Onest', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s;
}

.modal-close:hover {
  color: var(--accent);
  background: var(--accent-glow);
}

.modal-content {
  padding: 1.5rem;
  overflow-y: auto;
  font-family: 'Literata', Georgia, serif;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
}

.modal-content p {
  margin-bottom: 1em;
}

.modal-content p:last-child {
  margin-bottom: 0;
}

/* ─── Settings ─── */
.settings {
  position: fixed;
  top: 60px;
  right: 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px) scale(0.96);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 150;
  min-width: 220px;
}

.settings.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.setting-row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.setting-row:last-child {
  margin-bottom: 0;
}

.setting-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.toggle-group {
  display: flex;
  gap: 0.35rem;
}

.toggle {
  flex: 1;
  padding: 0.5rem 0.75rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.toggle:hover {
  border-color: var(--accent);
  color: var(--text);
}

.toggle.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.font-toggles .toggle {
  font-family: 'Literata', serif;
}

.font-toggles .toggle:nth-child(1) { font-size: 0.75rem; }
.font-toggles .toggle:nth-child(2) { font-size: 0.95rem; }
.font-toggles .toggle:nth-child(3) { font-size: 1.15rem; }

/* ─── Scrollbar ─── */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ─── Selection ─── */
::selection {
  background: var(--accent);
  color: #fff;
}

/* ─── Responsive ─── */
@media (max-width: 600px) {
  .main {
    padding: 4rem 1.25rem 3rem;
  }
  
  .chapter-title {
    font-size: 1.8rem;
  }
  
  .title {
    display: none;
  }
  
  .settings {
    right: 1rem;
    left: 1rem;
    min-width: auto;
  }
}

/* ─── Keyboard Navigation Hint ─── */
@media (hover: hover) {
  .nav-btn::after {
    content: attr(data-key);
    position: absolute;
    bottom: -20px;
    font-size: 0.65rem;
    color: var(--text-muted);
    opacity: 0;
    transition: opacity 0.2s;
  }
  
  .nav:hover .nav-btn::after {
    opacity: 0.5;
  }
}