/* ===== Base ===== */
*, *::before, *::after { box-sizing: border-box; }

.hidden { display: none !important; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  min-height: 100dvh;
  -webkit-text-size-adjust: 100%;
}

/* ===== Browse view ===== */
.page-wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}

.app-header {
  padding: 1.25rem 0 0.75rem;
  padding-left: 90px;
}

@media (max-width: 480px) {
  .app-header { padding-left: 80px; }
}

.app-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.app-subtitle {
  color: #94a3b8;
  font-size: 0.8rem;
  margin-top: 0.2rem;
}

/* ===== Search ===== */
.search-wrap {
  position: relative;
  margin: 0.75rem 0 1.5rem;
}

.search-wrap .search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  pointer-events: none;
  color: #64748b;
}

#search-input {
  width: 100%;
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: 0.75rem;
  padding: 0.8rem 2.75rem 0.8rem 2.75rem;
  font-size: 1rem;
  color: #e2e8f0;
  outline: none;
  transition: border-color 0.2s;
  -webkit-appearance: none;
  /* prevent iOS zoom on focus */
  font-size: max(1rem, 16px);
}

#search-input::placeholder { color: #475569; }
#search-input:focus { border-color: #4f46e5; }

.search-clear {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: #64748b;
  cursor: pointer;
  font-size: 1.1rem;
  /* big tap target */
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

/* ===== Section titles ===== */
.section-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #818cf8;
  margin-bottom: 0.75rem;
}

/* ===== Book cards ===== */
.books-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.85rem;
  margin-bottom: 2rem;
}

@media (min-width: 420px) {
  .books-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
}

.book-card {
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: 0.75rem;
  overflow: hidden;
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s;
  display: flex;
  flex-direction: column;
  position: relative;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.book-card:hover, .book-card:focus-visible {
  transform: translateY(-2px);
  border-color: #4f46e5;
  outline: none;
}

.book-card:active { transform: scale(0.97); }

.book-cover {
  aspect-ratio: 2 / 3;
  background: #0f172a;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book-cover-placeholder {
  font-size: 2.5rem;
  color: #334155;
}

.book-info {
  padding: 0.6rem 0.65rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  flex: 1;
}

.book-title {
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-author {
  font-size: 0.72rem;
  color: #94a3b8;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.book-meta {
  font-size: 0.7rem;
  color: #4f46e5;
}

/* ===== Card dismiss button ===== */
.card-remove-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  /* 36px tap target */
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.75);
  border: none;
  border-radius: 50%;
  color: #94a3b8;
  font-size: 0.7rem;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s, background 0.15s;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  z-index: 2;
  backdrop-filter: blur(4px);
  line-height: 1;
}

/* Always show on touch devices (no hover available) */
@media (hover: none) {
  .card-remove-btn { opacity: 0.7; }
}

.book-card:hover .card-remove-btn,
.continue-item:hover .card-remove-btn {
  opacity: 0.7;
}

.card-remove-btn:hover,
.card-remove-btn:focus-visible {
  opacity: 1 !important;
  color: #f87171;
  background: rgba(15, 23, 42, 0.92);
  outline: none;
}

.card-remove-btn:active {
  transform: scale(0.88);
}

/* ===== Loading / empty ===== */
.grid-loading {
  grid-column: 1 / -1;
  text-align: center;
  color: #94a3b8;
  padding: 2rem 0;
  font-size: 0.9rem;
}

.empty-message {
  color: #475569;
  font-size: 0.9rem;
  padding: 1.5rem 0;
}

/* ===== Reader view ===== */
#reader-view {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: flex;
  flex-direction: column;
  /* fill dynamic viewport, respect notch */
  height: 100dvh;
}

#reader-view.hidden { display: none; }

/* Floating controls bar */
#reader-controls {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9;
  background: rgba(15, 23, 42, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(51, 65, 85, 0.7);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.3rem;
  padding: calc(0.6rem + env(safe-area-inset-top, 0px)) 0.75rem 0.6rem;
  transition: opacity 0.25s, transform 0.25s;
}

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

#reader-title {
  flex: 1;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: #e2e8f0;
  min-width: 0;
  order: 0;
}

.reader-ctrl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(30, 41, 59, 0.9);
  border: 1px solid #334155;
  border-radius: 0.5rem;
  color: #e2e8f0;
  font-size: 0.82rem;
  font-weight: 600;
  /* 44px minimum touch target */
  height: 44px;
  min-width: 44px;
  padding: 0 0.65rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, border-color 0.15s;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  user-select: none;
}

.reader-ctrl-btn:hover, .reader-ctrl-btn:focus-visible {
  background: rgba(45, 55, 72, 0.95);
  border-color: #4f46e5;
  outline: none;
}

.reader-ctrl-btn:active { transform: scale(0.93); }

#btn-close-reader {
  color: #94a3b8;
  font-size: 1.1rem;
  border-color: transparent;
  background: transparent;
  order: -1;
}

/* Reading progress bar — thin strip at very top */
#reading-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  background: #4f46e5;
  border-radius: 0 1.5px 1.5px 0;
  width: 0;
  transition: width 0.25s;
  z-index: 10;
  pointer-events: none;
}

/* ===== Reader container (paged — no scroll) ===== */
#reader-container {
  flex: 1;
  overflow: hidden;
  position: relative;
  background: var(--reader-bg, #0f172a);
  color: var(--reader-text, #e2e8f0);
  /* No padding — handled by the wrapper/article below */
}

/* The wrapper gets the translateY transform on each page flip */
.reader-page-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  /* transition gives a quick page-turn feel without being slow */
  transition: transform 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

/* Spacer at end of article so last page clears the nav bar */
.reader-end-spacer {
  height: 64px;
}

/* ===== Always-visible bottom navigation bar ===== */
#reader-nav-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 9;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  background: rgba(15, 23, 42, 0.93);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid rgba(51, 65, 85, 0.5);
  padding: 0.35rem 0.75rem calc(0.35rem + env(safe-area-inset-bottom, 0px));
  height: calc(52px + env(safe-area-inset-bottom, 0px));
}

.reader-nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(30, 41, 59, 0.8);
  border: 1px solid #334155;
  border-radius: 0.5rem;
  color: #e2e8f0;
  font-size: 0.85rem;
  font-weight: 600;
  height: 40px;
  padding: 0 0.85rem;
  cursor: pointer;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  transition: background 0.15s, border-color 0.15s;
}

.reader-nav-btn:hover, .reader-nav-btn:focus-visible {
  background: rgba(45, 55, 72, 0.95);
  border-color: #4f46e5;
  outline: none;
}

.reader-nav-btn:active { transform: scale(0.93); }

.reader-nav-btn-toc {
  background: rgba(79, 70, 229, 0.2);
  border-color: rgba(79, 70, 229, 0.5);
  color: #a5b4fc;
}

.reader-nav-btn-toc:hover {
  background: rgba(79, 70, 229, 0.35);
  border-color: #4f46e5;
  color: #e2e8f0;
}

.reader-nav-progress {
  font-size: 0.78rem;
  color: #64748b;
  font-variant-numeric: tabular-nums;
  min-width: 2.5rem;
  text-align: center;
}

/* Theme variants for nav bar */
[data-reader-theme="sepia"] #reader-nav-bar {
  background: rgba(240, 233, 220, 0.96);
  border-color: rgba(196, 168, 130, 0.5);
}

[data-reader-theme="sepia"] .reader-nav-btn {
  background: rgba(237, 232, 223, 0.9);
  border-color: #c4a882;
  color: #3d2b1f;
}

[data-reader-theme="sepia"] .reader-nav-btn:hover {
  background: #d9cfc1;
}

[data-reader-theme="sepia"] .reader-nav-btn-toc {
  background: rgba(139, 90, 43, 0.15);
  border-color: rgba(139, 90, 43, 0.4);
  color: #8b5a2b;
}

[data-reader-theme="sepia"] .reader-nav-progress { color: #8b7355; }

[data-reader-theme="light"] #reader-nav-bar {
  background: rgba(255, 255, 255, 0.97);
  border-color: #e2e8f0;
}

[data-reader-theme="light"] .reader-nav-btn {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #1a1a1a;
}

[data-reader-theme="light"] .reader-nav-btn:hover {
  background: #e2e8f0;
}

[data-reader-theme="light"] .reader-nav-btn-toc {
  background: rgba(79, 70, 229, 0.08);
  border-color: rgba(79, 70, 229, 0.3);
  color: #4f46e5;
}

[data-reader-theme="light"] .reader-nav-progress { color: #94a3b8; }

/* ===== Tap-to-page zones ===== */
/* Left and right page-flip zones */
.page-zone {
  position: absolute;
  top: 0;
  bottom: 52px;
  width: 44px;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  cursor: pointer;
  user-select: none;
}

#zone-prev { left: 0; }
#zone-next { right: 0; }

.page-chevron {
  font-size: 2rem;
  line-height: 1;
  color: var(--reader-text, #e2e8f0);
  opacity: 0.18;
  transition: opacity 0.15s;
  pointer-events: none;
  /* slight font tweak for cleaner look */
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 300;
}

/* Show chevrons a bit more on hover (desktop) */
.page-zone:hover .page-chevron { opacity: 0.45; }

/* Tap feedback */
.page-zone.tapped .page-chevron { opacity: 0.7; }

/* On small screens, make chevrons slightly larger for easier targeting */
@media (max-width: 480px) {
  .page-zone { width: 36px; }
  .page-chevron { font-size: 1.75rem; opacity: 0.25; }
}

/* ===== Prose content ===== */
.reader-prose {
  max-width: 64ch;
  margin: 0 auto;
  /* horizontal + top padding (the top toolbar auto-hides, so just a small gap is fine) */
  padding: 1.25rem clamp(1rem, 6vw, 3rem) 0;
  font-family: var(--reader-font-family, Georgia, 'Times New Roman', serif);
  font-size: var(--reader-font-size, 18px);
  line-height: 1.8;
  color: var(--reader-text, #e2e8f0);
  word-spacing: 0.02em;
}

@media (max-width: 480px) {
  .reader-prose {
    font-size: max(var(--reader-font-size, 18px), 17px);
    line-height: 1.85;
  }
}

.reader-prose p {
  margin: 0 0 1.15em;
  /* prevent orphan lines */
  orphans: 2;
  widows: 2;
}

.reader-prose h1, .reader-prose h2, .reader-prose h3,
.reader-prose h4, .reader-prose h5, .reader-prose h6 {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 700;
  line-height: 1.3;
  margin: 1.8em 0 0.6em;
  color: var(--reader-text);
}

.reader-prose h1 { font-size: 1.55em; }
.reader-prose h2 { font-size: 1.25em; }
.reader-prose h3 { font-size: 1.08em; }

.reader-prose a {
  color: var(--reader-accent, #4f46e5);
  text-decoration: underline;
}

.reader-prose blockquote {
  border-left: 3px solid var(--reader-accent, #4f46e5);
  padding-left: 1em;
  margin: 1.2em 0;
  opacity: 0.85;
}

.reader-prose pre {
  font-size: 0.85em;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

/* Stop images overflowing on mobile */
.reader-prose img { max-width: 100%; height: auto; }

/* ===== Theme: sepia ===== */
[data-reader-theme="sepia"] body { background: #f5f0e8; }
[data-reader-theme="sepia"] #reader-container { background: #f5f0e8; }

[data-reader-theme="sepia"] #reader-controls {
  background: rgba(245, 240, 232, 0.97);
  border-color: rgba(180, 140, 80, 0.3);
}

[data-reader-theme="sepia"] .reader-ctrl-btn {
  background: rgba(237, 232, 223, 0.9);
  border-color: #c4a882;
  color: #3d2b1f;
}

[data-reader-theme="sepia"] .reader-ctrl-btn:hover {
  background: #d9cfc1;
  border-color: #8b5a2b;
}

[data-reader-theme="sepia"] #reader-title { color: #3d2b1f; }
[data-reader-theme="sepia"] #btn-close-reader { color: #8b5a2b; }
[data-reader-theme="sepia"] #reading-progress { background: #8b5a2b; }

/* ===== Theme: light ===== */
[data-reader-theme="light"] body { background: #ffffff; }
[data-reader-theme="light"] #reader-container { background: #ffffff; }

[data-reader-theme="light"] #reader-controls {
  background: rgba(255, 255, 255, 0.97);
  border-color: #e2e8f0;
}

[data-reader-theme="light"] .reader-ctrl-btn {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #1a1a1a;
}

[data-reader-theme="light"] .reader-ctrl-btn:hover {
  background: #e2e8f0;
  border-color: #4f46e5;
}

[data-reader-theme="light"] #reader-title { color: #1a1a1a; }
[data-reader-theme="light"] #btn-close-reader { color: #64748b; }

/* ===== Reader status (loading/error) ===== */
.reader-status {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 50vh;
  gap: 1rem;
  color: color-mix(in srgb, var(--reader-text, #e2e8f0) 60%, transparent);
  text-align: center;
  padding: 2rem;
}

.reader-error { color: #f87171; }
.reader-error-hint {
  font-size: 0.85em;
  color: color-mix(in srgb, var(--reader-text, #e2e8f0) 50%, transparent);
}

.reader-spinner {
  width: 2.5rem;
  height: 2.5rem;
  border: 2.5px solid color-mix(in srgb, var(--reader-text, #e2e8f0) 15%, transparent);
  border-top-color: var(--reader-accent, #4f46e5);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

/* ===== TOC bottom sheet ===== */
#toc-sheet-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  z-index: 1100;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  animation: fade-in 0.2s ease;
}

#toc-sheet {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1101;
  background: #111827;
  border-radius: 1rem 1rem 0 0;
  border-top: 1px solid #334155;
  display: flex;
  flex-direction: column;
  max-height: 72dvh;
  animation: sheet-up 0.25s cubic-bezier(0.32, 0.72, 0, 1);
  outline: none;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

/* Theme variants for the sheet */
[data-reader-theme="sepia"] #toc-sheet {
  background: #ede8df;
  border-color: #c4a882;
}

[data-reader-theme="light"] #toc-sheet {
  background: #f8fafc;
  border-color: #e2e8f0;
}

@keyframes sheet-up {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.toc-sheet-handle {
  width: 36px;
  height: 4px;
  background: #334155;
  border-radius: 2px;
  margin: 0.65rem auto 0;
  flex-shrink: 0;
}

[data-reader-theme="sepia"] .toc-sheet-handle,
[data-reader-theme="light"] .toc-sheet-handle { background: #cbd5e1; }

.toc-sheet-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid #1e293b;
  flex-shrink: 0;
}

[data-reader-theme="sepia"] .toc-sheet-head { border-color: #c4a882; }
[data-reader-theme="light"] .toc-sheet-head { border-color: #e2e8f0; }

.toc-sheet-title {
  flex: 1;
  min-width: 0;
  font-size: 0.82rem;
  font-weight: 600;
  color: #94a3b8;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin: 0;
}

[data-reader-theme="sepia"] .toc-sheet-title { color: #8b5a2b; }
[data-reader-theme="light"] .toc-sheet-title { color: #64748b; }

.toc-sheet-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1e293b;
  border: none;
  border-radius: 50%;
  color: #94a3b8;
  font-size: 0.85rem;
  cursor: pointer;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

[data-reader-theme="sepia"] .toc-sheet-close { background: #d9cfc1; color: #8b5a2b; }
[data-reader-theme="light"] .toc-sheet-close { background: #e2e8f0; color: #64748b; }

.toc-sheet-close:hover { color: #e2e8f0; background: #334155; }

.toc-sheet-body {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  padding: 0.5rem 0;
}

.toc-items {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc-item {
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
  line-height: 1.4;
  cursor: pointer;
  border-bottom: 1px solid rgba(51, 65, 85, 0.35);
  transition: background 0.12s;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  color: #e2e8f0;
  /* min 44px touch target */
  min-height: 44px;
  display: flex;
  align-items: center;
}

.toc-item:last-child { border-bottom: none; }

.toc-item:hover, .toc-item:focus-visible {
  background: rgba(79, 70, 229, 0.15);
  outline: none;
}

.toc-item:active { background: rgba(79, 70, 229, 0.25); }

/* Indent sub-levels */
.toc-level-2 { padding-left: 2rem; font-size: 0.85rem; color: #94a3b8; }
.toc-level-3 { padding-left: 2.75rem; font-size: 0.82rem; color: #64748b; }
.toc-level-4 { padding-left: 3.25rem; font-size: 0.8rem; color: #475569; }

[data-reader-theme="sepia"] .toc-item { color: #3d2b1f; border-color: rgba(196, 168, 130, 0.4); }
[data-reader-theme="sepia"] .toc-level-2 { color: #6b4c2a; }
[data-reader-theme="sepia"] .toc-level-3 { color: #8b6540; }
[data-reader-theme="sepia"] .toc-item:hover { background: rgba(139, 90, 43, 0.12); }

[data-reader-theme="light"] .toc-item { color: #1a1a1a; border-color: #e2e8f0; }
[data-reader-theme="light"] .toc-level-2 { color: #475569; }
[data-reader-theme="light"] .toc-level-3 { color: #64748b; }
[data-reader-theme="light"] .toc-item:hover { background: rgba(79, 70, 229, 0.08); }

.toc-empty {
  color: #475569;
  font-size: 0.9rem;
  padding: 1.5rem 1.25rem;
}

/* ===== Toast ===== */
#toast-stack {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  pointer-events: none;
  width: max-content;
  max-width: calc(100vw - 2rem);
}

.toast {
  background: rgba(30, 41, 59, 0.97);
  border: 1px solid #334155;
  color: #e2e8f0;
  padding: 0.65rem 1.1rem;
  border-radius: 0.65rem;
  font-size: 0.88rem;
  text-align: center;
  animation: toast-in 0.2s ease;
  backdrop-filter: blur(10px);
}

.toast-success { border-color: #22c55e; color: #86efac; }
.toast-error { border-color: #ef4444; color: #fca5a5; }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}