:root {
  --bg: #f7f5f2;
  --bg-card: #ffffff;
  --bg-card-hover: #f0edea;
  --bg-modal: rgba(28,24,23,0.35);
  --text: #1c1817;
  --text-secondary: #8e8580;
  --text-tertiary: #b8b0ab;
  --border: #e5dfda;
  --shadow: 0 1px 3px rgba(28,24,23,0.05);
  --shadow-md: 0 4px 12px rgba(28,24,23,0.06);
  --shadow-lg: 0 8px 30px rgba(28,24,23,0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --accent: #7a2e36;
  --accent-hover: #5e2228;
  --accent-light: #f0e4e6;
  --star: #c9a87c;
  --success: #5a7a5a;
  --danger: #9a3e3e;
  --font: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', system-ui, sans-serif;
  --max-w: 720px;
  --transition: 0.2s cubic-bezier(0.25, 0.1, 0.25, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1817;
    --bg-card: #262120;
    --bg-card-hover: #2d2826;
    --bg-modal: rgba(0,0,0,0.55);
    --text: #f0edea;
    --text-secondary: #a59c98;
    --text-tertiary: #736b67;
    --border: #36302d;
    --accent: #a84551;
    --accent-hover: #bf5a66;
    --accent-light: #3a2023;
  }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
  padding-bottom: 60px;
}
a { color: var(--accent); text-decoration: none; }
img { max-width: 100%; display: block; }

.app-layout { max-width: var(--max-w); margin: 0 auto; padding: 0 16px; }

/* Top bar */
.mobile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  margin-bottom: 20px;
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
}
.mobile-header-inner { display: flex; align-items: center; gap: 12px; width: 100%; }
.mobile-header-title { font-size: 17px; font-weight: 700; flex: 1; letter-spacing: -0.3px; color: var(--text); }
.mobile-menu-btn {
  background: none; border: none; color: var(--text); cursor: pointer; padding: 4px;
  display: flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
}
.mobile-menu-btn svg { width: 22px; height: 22px; }

/* Bottom tabs (mobile) */
.bottom-tabs {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  background: rgba(247,245,242,0.92);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-top: 1px solid var(--border);
  z-index: 100;
  padding: 4px 0;
  padding-bottom: max(4px, env(safe-area-inset-bottom, 4px));
}
@media (prefers-color-scheme: dark) {
  .bottom-tabs { background: rgba(28,24,23,0.92); }
}
.tab-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 0;
  border: none;
  background: none;
  color: var(--text-tertiary);
  font-size: 10px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: color var(--transition);
  -webkit-tap-highlight-color: transparent;
}
.tab-item svg { width: 22px; height: 22px; stroke-width: 1.5; }
.tab-item.active { color: var(--accent); }
.tab-item.active svg { stroke-width: 2; }

/* Page header */
.page-header { margin-bottom: 24px; }
.page-title {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.4px;
  color: var(--text);
}
.page-subtitle {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 2px;
}

/* Stats cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 18px 16px;
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.stat-card:hover { box-shadow: var(--shadow-md); }

.stat-icon {
  width: 32px; height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  color: white;
}
.stat-icon svg { width: 16px; height: 16px; }
.stat-icon.accent { background: var(--accent); }
.stat-icon.gold { background: var(--star); }
.stat-icon.muted { background: var(--text-tertiary); }
.stat-icon.success { background: var(--success); }

.stat-value {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.4px;
  line-height: 1;
  color: var(--text);
}
.stat-label {
  font-size: 11px;
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  margin-top: 4px;
}
.stat-sub {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 2px;
}

/* Book grid */
.book-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.book-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all var(--transition);
  cursor: pointer;
}
.book-card:active { transform: scale(0.98); }

.book-cover {
  aspect-ratio: 2/3;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-tertiary);
  overflow: hidden;
}
.book-cover img { width: 100%; height: 100%; object-fit: cover; }
.book-cover .no-cover {
  display: flex; align-items: center; justify-content: center;
  width: 100%; height: 100%;
  background: linear-gradient(135deg, #7a2e3615, #5e222815);
  font-size: 28px;
  color: var(--text-tertiary);
}

.book-info { padding: 10px; }
.book-title {
  font-size: 13px;
  font-weight: 600;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  color: var(--text);
}
.book-author {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 2px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.book-rating { display: flex; gap: 2px; margin-top: 4px; }
.book-rating .star { font-size: 11px; color: var(--star); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  font-family: inherit;
  white-space: nowrap;
  line-height: 1.3;
  -webkit-tap-highlight-color: transparent;
}
.btn:active { transform: scale(0.97); }
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

.btn-primary { background: var(--accent); color: white; }
.btn-primary:active { background: var(--accent-hover); }

.btn-secondary {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:active { background: var(--bg-card-hover); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 12px;
}

.btn-block { width: 100%; }

.btn-danger { background: transparent; color: var(--danger); border: 1px solid var(--danger); }
.btn-danger:active { background: var(--danger); color: white; }

.upload-btn { cursor: pointer; }

/* Modals */
.modal-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: var(--bg-modal);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 200;
  display: flex; align-items: flex-end; justify-content: center;
  padding: 0;
  opacity: 0; pointer-events: none;
  transition: opacity 0.25s ease;
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }

.modal {
  background: var(--bg-card);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  width: 100%;
  max-width: 500px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 -10px 40px rgba(0,0,0,0.15);
  transform: translateY(100%);
  transition: transform 0.35s cubic-bezier(0.25, 0.1, 0.25, 1);
}
.modal-overlay.open .modal { transform: translateY(0); }

.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 20px 0;
}
.modal-title { font-size: 17px; font-weight: 700; letter-spacing: -0.2px; }
.modal-close {
  background: none; border: none; color: var(--text-tertiary);
  cursor: pointer; font-size: 24px; line-height: 1; padding: 4px;
  transition: color var(--transition);
}
.modal-close:active { color: var(--text); }

.modal-body { padding: 20px; }

/* Edit form */
.edit-form { display: flex; flex-direction: column; gap: 14px; }
.edit-field { display: flex; flex-direction: column; gap: 4px; }
.edit-label {
  font-size: 12px; font-weight: 600; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.4px;
}
.edit-input {
  width: 100%; padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition);
}
.edit-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(122,46,54,0.1); }
.edit-cover-row { display: flex; gap: 8px; }

.subjects-grid {
  display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px;
}
.subject-check {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 5px 12px; border-radius: 100px;
  background: var(--bg); border: 1px solid var(--border);
  font-size: 12px; cursor: pointer; transition: all var(--transition);
  color: var(--text-secondary); user-select: none;
}
.subject-check.active {
  background: var(--accent-light); border-color: var(--accent); color: var(--accent); font-weight: 600;
}
.subject-check input { display: none; }

/* Search */
.search-box { position: relative; }

.search-box input {
  width: 100%;
  padding: 12px 14px 12px 38px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: all var(--transition);
}
.search-box input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(122,46,54,0.1); }
.search-box .search-icon {
  position: absolute; left: 12px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

.search-results {
  margin-top: 16px;
  display: flex; flex-direction: column; gap: 6px;
  max-height: 380px; overflow-y: auto;
}

.search-result-item {
  display: flex; gap: 12px; padding: 10px;
  border-radius: var(--radius-sm); cursor: pointer;
  transition: background var(--transition); align-items: center;
}
.search-result-item:active { background: var(--bg); }

.search-result-cover {
  width: 36px; height: 54px;
  border-radius: 4px; background: var(--bg);
  flex-shrink: 0; overflow: hidden;
}
.search-result-cover img { width: 100%; height: 100%; object-fit: cover; }

.search-result-info { flex: 1; min-width: 0; }
.search-result-title { font-size: 14px; font-weight: 600; color: var(--text); }
.search-result-author { font-size: 12px; color: var(--text-secondary); }
.search-result-meta { font-size: 11px; color: var(--text-tertiary); margin-top: 2px; }
.search-result-add { flex-shrink: 0; }

/* Book detail */
.book-detail {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}
@media (min-width: 769px) {
  .book-detail {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 40px;
    margin-bottom: 36px;
  }
}
.book-detail-cover {
  width: 120px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  aspect-ratio: 2/3;
  background: var(--bg);
  flex-shrink: 0;
}
.book-detail-cover img { width: 100%; height: 100%; object-fit: cover; }
.book-detail-cover .no-cover {
  display: flex; align-items: center; justify-content: center;
  height: 100%;
  background: linear-gradient(135deg, #7a2e3615, #5e222815);
  color: var(--text-tertiary);
  font-size: 36px;
}
.book-detail-meta {
  display: flex; gap: 12px; margin-top: 8px; flex-wrap: wrap;
}
.book-detail-meta-item {
  font-size: 12px;
  color: var(--text-tertiary);
  display: flex; align-items: center; gap: 4px;
}
.book-detail-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
  line-height: 1.2;
  color: var(--text);
}
.book-detail-author {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 2px;
}
.book-detail-subjects {
  display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px;
}
.subject-tag {
  padding: 2px 10px;
  border-radius: 100px;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 11px;
  font-weight: 500;
}
.book-detail-actions {
  display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px;
}

/* Rating stars */
.star-rating { display: flex; gap: 2px; direction: rtl; }
.star-rating input { display: none; }
.star-rating label {
  font-size: 28px;
  cursor: pointer;
  color: var(--text-tertiary);
  transition: color 0.12s ease;
}
.star-rating label:hover,
.star-rating label:hover ~ label,
.star-rating input:checked ~ label {
  color: var(--star);
}

/* Reviews */
.review-section, .sessions-section {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
  margin-bottom: 16px;
}
.review-section-title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.2px;
  margin-bottom: 12px;
  color: var(--text);
}
.review-form textarea {
  width: 100%; min-height: 100px;
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  resize: vertical;
  margin-top: 12px;
  transition: border-color var(--transition);
}
.review-form textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(122,46,54,0.1); }
.review-display { margin-top: 8px; }
.review-display-stars { display: flex; gap: 2px; margin-bottom: 8px; }
.review-display-stars .star { font-size: 18px; color: var(--star); }
.review-display-text {
  font-size: 14px; line-height: 1.7; color: var(--text-secondary);
}

/* Timer */
.timer-container { text-align: center; padding: 40px 0; }

.timer-display {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -2px;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--text);
  margin-bottom: 4px;
}
.timer-sub { color: var(--text-secondary); font-size: 14px; margin-bottom: 24px; }
.timer-controls { display: flex; gap: 16px; justify-content: center; margin-bottom: 24px; }
.timer-btn {
  width: 56px; height: 56px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
  color: white;
  -webkit-tap-highlight-color: transparent;
  position: relative;
}
.timer-btn-icon { display: flex; align-items: center; justify-content: center; }
.timer-btn-icon svg { width: 26px; height: 26px; display: block; }
.timer-btn-fallback { font-size: 24px; line-height: 1; }
.timer-btn-start { background: var(--success); }
.timer-btn-start:active { transform: scale(0.92); }
.timer-btn-pause { background: #d4a853; }
.timer-btn-pause:active { transform: scale(0.92); }
.timer-btn-stop { background: var(--danger); }
.timer-btn-stop:active { transform: scale(0.92); }
.timer-btn:disabled { opacity: 0.3; cursor: not-allowed; transform: none !important; }

.timer-progress {
  width: 100%; max-width: 280px; margin: 0 auto;
  height: 4px; background: var(--border);
  border-radius: 2px; overflow: hidden;
}
.timer-progress-bar {
  height: 100%; background: var(--accent);
  border-radius: 2px; transition: width 1s linear; width: 0%;
}

.timer-sessions { margin-top: 32px; }
.timer-sessions-list { display: flex; flex-direction: column; gap: 6px; }

.timer-session-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  font-size: 13px;
}
.timer-session-date { color: var(--text-secondary); }
.timer-session-duration { font-weight: 600; color: var(--text); }

/* Share card */
.share-container {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
}
.share-card-preview {
  width: 100%; max-width: 320px;
  margin: 0 auto 20px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0,0,0,0.25);
  aspect-ratio: 9/16;
  position: relative;
  background: #1c1817;
}
.share-card-preview canvas { width: 100%; height: 100%; display: block; }
.share-actions { display: flex; gap: 12px; justify-content: center; }

/* Tabs */
.tabs {
  display: flex; gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}
.tab {
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border: none;
  background: none;
  position: relative;
  font-family: inherit;
  transition: color var(--transition);
  -webkit-tap-highlight-color: transparent;
}
.tab:active { color: var(--text); }
.tab.active { color: var(--accent); }
.tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 16px;
  right: 16px;
  height: 2.5px;
  background: var(--accent);
  border-radius: 2px;
}

/* Rating bars */
.rating-bar {
  display: flex; align-items: center; gap: 8px; margin-bottom: 6px;
}
.rating-bar-label { font-size: 13px; color: var(--text-secondary); width: 30px; text-align: right; }
.rating-bar-track {
  flex: 1; height: 6px; background: var(--border);
  border-radius: 3px; overflow: hidden;
}
.rating-bar-fill { height: 100%; background: var(--star); border-radius: 3px; transition: width 0.4s ease; }
.rating-bar-count { font-size: 12px; color: var(--text-tertiary); width: 28px; }

/* Charts */
.chart-container {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 20px;
  border: 1px solid var(--border);
  margin-bottom: 14px;
}
.chart-title { font-size: 14px; font-weight: 600; margin-bottom: 14px; color: var(--text); }

/* Section */
.section-header {
  display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px;
}
.section-title { font-size: 16px; font-weight: 700; letter-spacing: -0.2px; color: var(--text); }

/* Subject cloud */
.subject-cloud { display: flex; flex-wrap: wrap; gap: 6px; }
.subject-cloud .subject-tag { font-size: 12px; padding: 4px 12px; }

/* Auth */
.auth-container {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
.auth-card {
  background: var(--bg-card);
  border-radius: 20px;
  padding: 40px 28px 36px;
  width: 100%;
  max-width: 340px;
  border: 1px solid var(--border);
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.auth-logo {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: var(--accent);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px;
  font-size: 20px;
  font-weight: 700;
  color: white;
}
.auth-title {
  font-size: 20px; font-weight: 700; letter-spacing: -0.3px; margin-bottom: 4px; color: var(--text);
}
.auth-subtitle { font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; }
.auth-form { display: flex; flex-direction: column; gap: 12px; }
.auth-form input {
  width: 100%; padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition);
}
.auth-form input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(122,46,54,0.1); }
.auth-error { font-size: 13px; color: var(--danger); margin-top: 8px; }

/* Empty state */
.empty-state { text-align: center; padding: 48px 20px; }
.empty-state-icon { font-size: 36px; margin-bottom: 14px; color: var(--text-tertiary); }
.empty-state-title { font-size: 16px; font-weight: 700; margin-bottom: 4px; letter-spacing: -0.2px; color: var(--text); }
.empty-state-text { font-size: 13px; color: var(--text-secondary); margin-bottom: 20px; }

/* Loading */
.loading { display: flex; align-items: center; justify-content: center; padding: 48px; }
.spinner {
  width: 22px; height: 22px;
  border: 2.5px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Toast */
.toast {
  position: fixed; bottom: 80px; left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--text); color: var(--bg);
  padding: 12px 24px; border-radius: var(--radius);
  font-size: 13px; font-weight: 600;
  z-index: 300; opacity: 0;
  transition: all 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
  pointer-events: none;
  white-space: nowrap;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Section */
.section { margin-bottom: 32px; }

/* Authors list */
.top-authors { display: flex; flex-direction: column; gap: 6px; }
.author-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  font-size: 13px;
}
.author-item-name { font-weight: 600; color: var(--text); }
.author-item-count { color: var(--text-secondary); }

/* Monthly chart */
.monthly-chart {
  display: flex; align-items: flex-end; gap: 4px; height: 100px;
}
.month-bar {
  flex: 1; min-width: 16px;
  background: var(--accent);
  border-radius: 3px 3px 0 0;
  position: relative; cursor: pointer;
  transition: opacity var(--transition); min-height: 3px;
}
.month-bar:active { opacity: 0.7; }
.month-bar-label {
  position: absolute; bottom: -18px; left: 50%;
  transform: translateX(-50%);
  font-size: 9px; color: var(--text-tertiary); white-space: nowrap;
}

/* Recent books */
.recent-list { display: flex; flex-direction: column; gap: 6px; }
.recent-item {
  display: flex; gap: 12px; padding: 12px;
  background: var(--bg); border-radius: var(--radius-sm);
  align-items: center; cursor: pointer;
  transition: background var(--transition);
}
.recent-item:active { background: var(--bg-card-hover); }
.recent-item-cover {
  width: 30px; height: 45px;
  border-radius: 4px; background: var(--border);
  flex-shrink: 0; overflow: hidden;
}
.recent-item-cover img { width: 100%; height: 100%; object-fit: cover; }
.recent-item-info { flex: 1; min-width: 0; }
.recent-item-title { font-size: 13px; font-weight: 600; color: var(--text); }
.recent-item-meta { font-size: 11px; color: var(--text-secondary); }

/* Sidebar hidden on mobile */
@media (max-width: 768px) {
  .sidebar { display: none !important; }
}

/* Desktop overrides */
@media (min-width: 769px) {
  body { padding-bottom: 0; }
  .app-layout { max-width: 860px; padding: 0 32px; }
  .bottom-tabs { display: none; }
  .mobile-header { display: none; }

  .sidebar {
    width: 220px;
    background: var(--bg-card);
    border-right: 1px solid var(--border);
    padding: 24px 14px;
    display: flex;
    flex-direction: column;
    position: fixed; top: 0; left: 0; bottom: 0;
    z-index: 100;
  }
  .sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 10px 28px;
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
  }
  .sidebar-brand-icon {
    width: 28px; height: 28px;
    border-radius: 6px;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
  }
  .sidebar-nav { display: flex; flex-direction: column; gap: 2px; flex: 1; }
  .nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 10px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    line-height: 1.2;
  }
  .nav-item:hover { background: var(--bg); color: var(--text); }
  .nav-item.active { background: var(--accent-light); color: var(--accent); font-weight: 600; }
  .nav-item svg { width: 18px; height: 18px; flex-shrink: 0; stroke-width: 1.8; }

  .main-content {
    flex: 1;
    margin-left: 220px;
    padding: 36px 48px 60px;
    max-width: calc(220px + 860px);
    min-height: 100vh;
  }

  .book-grid { grid-template-columns: repeat(auto-fill, minmax(155px, 1fr)); gap: 16px; }
  .stats-grid { grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); }

  .book-detail-cover { width: 100%; position: sticky; top: 40px; }

  .modal-overlay { align-items: center; padding: 20px; }
  .modal { border-radius: var(--radius-lg); transform: scale(0.95) translateY(10px); }
  .modal-overlay.open .modal { transform: scale(1) translateY(0); }

  .share-card-preview { max-width: 380px; }
  .timer-display { font-size: 72px; }
}

@media (min-width: 480px) {
  .book-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
}

/* Mobile modal (bottom sheet) */
@media (max-width: 768px) {
  .modal { max-width: 100%; margin: 0; max-height: 90vh; }
  .modal-header { padding: 20px 20px 0; }
  .modal-body { padding: 20px; }
}