/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --font:         'Nunito', 'Segoe UI', sans-serif;
  --font-serif:   'Lora', Georgia, serif;

  /* ── Dark warm charcoal ── */
  --bg:           #1c1a18;
  --bg-2:         #252320;
  --bg-3:         #2e2b28;
  --bg-4:         #383430;
  --border:       #3a3632;
  --border-2:     #4a4540;
  --text:         #f0ece6;
  --text-2:       #a09890;
  --text-3:       #6a6260;
  --accent:       #f97316;
  --accent-soft:  rgba(249,115,22,0.15);
  --accent-2:     #fb923c;
  --teal:         #14b8a6;
  --teal-soft:    rgba(20,184,166,0.15);
  --amber:        #f59e0b;
  --green:        #22c55e;
  --green-soft:   rgba(34,197,94,0.15);
  --danger:       #ef4444;
  --danger-bg:    rgba(239,68,68,0.12);
  --badge-r-bg:   rgba(245,158,11,0.18);
  --badge-r-text: #fbbf24;
  --badge-f-bg:   rgba(34,197,94,0.18);
  --badge-f-text: #4ade80;
  --badge-n-bg:   rgba(148,163,184,0.12);
  --badge-n-text: #94a3b8;
  --shadow:       0 8px 32px rgba(0,0,0,0.45);
  --shadow-sm:    0 2px 12px rgba(0,0,0,0.25);
  --shadow-card:  0 4px 20px rgba(0,0,0,0.3);
  --radius:       16px;
  --radius-sm:    10px;
  --radius-xs:    6px;
  --transition:   0.2s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="light"] {
  --bg:           #fdf8f3;
  --bg-2:         #ffffff;
  --bg-3:         #f5ede3;
  --bg-4:         #ede0d0;
  --border:       #e8d8c8;
  --border-2:     #d4c0a8;
  --text:         #2d2420;
  --text-2:       #7a6860;
  --text-3:       #b0a090;
  --accent:       #ea6c0a;
  --accent-soft:  rgba(234,108,10,0.1);
  --accent-2:     #f97316;
  --teal:         #0d9488;
  --teal-soft:    rgba(13,148,136,0.1);
  --amber:        #d97706;
  --green:        #16a34a;
  --green-soft:   rgba(22,163,74,0.1);
  --danger:       #dc2626;
  --danger-bg:    rgba(220,38,38,0.08);
  --badge-r-bg:   rgba(217,119,6,0.12);
  --badge-r-text: #b45309;
  --badge-f-bg:   rgba(22,163,74,0.12);
  --badge-f-text: #15803d;
  --badge-n-bg:   rgba(100,116,139,0.1);
  --badge-n-text: #64748b;
  --shadow:       0 8px 32px rgba(0,0,0,0.1);
  --shadow-sm:    0 2px 12px rgba(0,0,0,0.06);
  --shadow-card:  0 4px 20px rgba(0,0,0,0.08);
}

html { font-size: 15px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

/* ===== UTILS ===== */
.hidden { display: none !important; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.text-center { text-align: center; }
.full-width { width: 100%; }

/* ===== LAYOUT ===== */
#app { display: flex; flex-direction: column; min-height: 100vh; max-width: 1440px; margin: 0 auto; }

/* ===== HEADER ===== */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: background var(--transition), border-color var(--transition);
}

.header-left { display: flex; align-items: center; gap: 10px; }

.app-logo {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--amber) 100%);
  border-radius: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  box-shadow: 0 3px 10px rgba(249,115,22,0.35);
  flex-shrink: 0;
}

.app-name {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}

.header-right { display: flex; align-items: center; gap: 8px; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  border: 1.5px solid transparent;
  font-family: var(--font);
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--amber));
  color: white;
  box-shadow: 0 4px 14px rgba(249,115,22,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(249,115,22,0.45); }
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: var(--bg-3);
  color: var(--text-2);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--bg-4); color: var(--text); border-color: var(--border-2); }

.btn-teal {
  background: var(--teal-soft);
  color: var(--teal);
  border-color: color-mix(in srgb, var(--teal) 35%, transparent);
}
.btn-teal:hover { background: var(--teal); color: white; }

.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(239,68,68,0.4); }

.btn-sm { padding: 7px 14px; font-size: 0.82rem; }

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-xs);
  border: 1.5px solid var(--border);
  background: var(--bg-3);
  color: var(--text-2);
  cursor: pointer;
  transition: all var(--transition);
}
.btn-icon:hover { background: var(--bg-4); color: var(--text); border-color: var(--border-2); transform: translateY(-1px); }

/* ===== CONTROLS BAR ===== */
.controls-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  transition: border-color var(--transition);
}

.search-wrap { position: relative; flex: 1; min-width: 180px; max-width: 340px; }

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-3);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 9px 34px 9px 36px;
  background: var(--bg-2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.88rem;
  font-weight: 500;
  outline: none;
  transition: all var(--transition);
}
.search-input::placeholder { color: var(--text-3); }
.search-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.search-clear {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-3);
  cursor: pointer;
  display: flex;
  align-items: center;
  padding: 2px;
}
.search-clear:hover { color: var(--text); }

.filter-tabs {
  display: flex;
  gap: 3px;
  background: var(--bg-3);
  padding: 4px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
}

.filter-tab {
  padding: 6px 14px;
  background: transparent;
  border: none;
  border-radius: var(--radius-xs);
  color: var(--text-2);
  font-family: var(--font);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
}
.filter-tab.active {
  background: linear-gradient(135deg, var(--accent), var(--amber));
  color: white;
  box-shadow: 0 2px 8px rgba(249,115,22,0.28);
}
.filter-tab:hover:not(.active) { color: var(--text); background: var(--bg-4); }

.sort-select {
  padding: 9px 12px;
  background: var(--bg-2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  transition: all var(--transition);
}
.sort-select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* ===== STATS BAR ===== */
.stats-bar {
  display: flex;
  gap: 10px;
  padding: 12px 24px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  transition: border-color var(--transition);
}

.stat-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  padding: 6px 14px;
  background: var(--bg-2);
  border: 1.5px solid var(--border);
  border-radius: 100px;
  font-weight: 600;
  transition: all var(--transition);
}
.stat-chip .stat-num { font-weight: 800; color: var(--accent); font-size: 0.95rem; }
.stat-chip .stat-label { color: var(--text-3); font-weight: 500; }

/* ===== MAIN CONTENT ===== */
.main-content { flex: 1; padding: 24px; }

/* ===== BOOKS GRID ===== */
.books-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 580px)  { .books-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px)  { .books-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1200px) { .books-grid { grid-template-columns: repeat(4, 1fr); } }

/* ===== BOOK CARD ===== */
.book-card {
  background: var(--bg-2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition);
  animation: fadeSlideUp 0.28s ease both;
  box-shadow: var(--shadow-card);
}
.book-card:hover { border-color: var(--border-2); transform: translateY(-4px); box-shadow: var(--shadow); }

/* Cover */
.book-cover-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--bg-3);
  overflow: hidden;
  flex-shrink: 0;
}

.book-cover-img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.book-card:hover .book-cover-img { transform: scale(1.05); }

.book-cover-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.cover-gradient-1 { background: linear-gradient(135deg, #1a1035 0%, #2d1b52 50%, #1a2a4a 100%); }
.cover-gradient-2 { background: linear-gradient(135deg, #1a2a1a 0%, #0a3320 50%, #162a1a 100%); }
.cover-gradient-3 { background: linear-gradient(135deg, #2a1a10 0%, #3d1e0a 50%, #2a1a0a 100%); }
.cover-gradient-4 { background: linear-gradient(135deg, #1a1a2a 0%, #0f1535 50%, #1a0f2a 100%); }
.cover-gradient-5 { background: linear-gradient(135deg, #2a0a0a 0%, #3d0f0f 50%, #1a0505 100%); }

[data-theme="light"] .cover-gradient-1 { background: linear-gradient(135deg, #ddd6fe 0%, #c4b5fd 50%, #a5b4fc 100%); }
[data-theme="light"] .cover-gradient-2 { background: linear-gradient(135deg, #bbf7d0 0%, #86efac 50%, #6ee7b7 100%); }
[data-theme="light"] .cover-gradient-3 { background: linear-gradient(135deg, #fed7aa 0%, #fdba74 50%, #fca5a5 100%); }
[data-theme="light"] .cover-gradient-4 { background: linear-gradient(135deg, #bfdbfe 0%, #93c5fd 50%, #a5f3fc 100%); }
[data-theme="light"] .cover-gradient-5 { background: linear-gradient(135deg, #fecdd3 0%, #fda4af 50%, #f9a8d4 100%); }

.cover-initials {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-style: italic;
  font-weight: 600;
  color: rgba(255,255,255,0.55);
  text-align: center;
  padding: 8px;
  line-height: 1.2;
  position: relative;
  z-index: 1;
  max-width: 90%;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
[data-theme="light"] .cover-initials { color: rgba(30,20,10,0.45); }

.badge-on-cover {
  position: absolute;
  top: 10px; right: 10px;
  padding: 4px 10px;
  border-radius: 100px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.badge-reading   { background: var(--badge-r-bg); color: var(--badge-r-text); border: 1px solid color-mix(in srgb, var(--badge-r-text) 35%, transparent); }
.badge-finished  { background: var(--badge-f-bg); color: var(--badge-f-text); border: 1px solid color-mix(in srgb, var(--badge-f-text) 35%, transparent); }
.badge-not_started { background: var(--badge-n-bg); color: var(--badge-n-text); border: 1px solid var(--border); }

/* Card body */
.book-card-body { padding: 15px 16px 10px; display: flex; flex-direction: column; gap: 10px; flex: 1; }

.book-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.book-author { font-size: 0.78rem; color: var(--text-2); font-weight: 500; margin-top: -4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.book-progress-section { display: flex; flex-direction: column; gap: 6px; }

.progress-row { display: flex; align-items: center; justify-content: space-between; }
.progress-pct { font-size: 0.85rem; font-weight: 800; color: var(--accent); }
.progress-pages { font-size: 0.72rem; color: var(--text-3); font-weight: 500; }

.progress-bar { width: 100%; height: 6px; background: var(--bg-4); border-radius: 100px; overflow: hidden; }
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--amber));
  border-radius: 100px;
  transition: width 0.6s cubic-bezier(0.4,0,0.2,1);
}
.progress-fill.complete { background: linear-gradient(90deg, var(--teal), var(--green)); }

.book-meta { display: flex; align-items: center; gap: 6px; font-size: 0.72rem; color: var(--text-3); font-weight: 500; }
.meta-dot { opacity: 0.5; }

/* Actions */
.book-actions {
  padding: 10px 14px 13px;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.card-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 11px;
  background: var(--bg-3);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text-2);
  font-family: var(--font);
  font-size: 0.74rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
}
.card-btn:hover { background: var(--bg-4); color: var(--text); border-color: var(--border-2); transform: translateY(-1px); }

.card-btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--amber));
  color: white;
  border-color: transparent;
  box-shadow: 0 2px 8px rgba(249,115,22,0.28);
}
.card-btn.primary:hover { box-shadow: 0 4px 14px rgba(249,115,22,0.4); transform: translateY(-1px); }

.card-btn.share-btn {
  background: var(--teal-soft);
  color: var(--teal);
  border-color: color-mix(in srgb, var(--teal) 30%, transparent);
}
.card-btn.share-btn:hover { background: var(--teal); color: white; border-color: var(--teal); }

.card-btn.del { color: var(--danger); }
.card-btn.del:hover { background: var(--danger-bg); border-color: var(--danger); color: var(--danger); }

/* ===== EMPTY STATE ===== */
.empty-state { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px; padding: 80px 20px; text-align: center; }
.empty-icon { color: var(--text-3); margin-bottom: 6px; opacity: 0.6; }
.empty-title { font-size: 1.2rem; font-weight: 800; color: var(--text-2); font-family: var(--font-serif); }
.empty-sub { font-size: 0.85rem; color: var(--text-3); max-width: 280px; line-height: 1.6; }

/* ===== MODALS ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 16px;
  animation: fadeIn 0.18s ease;
}

.modal-box {
  background: var(--bg-2);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  width: 100%;
  max-width: 460px;
  box-shadow: var(--shadow);
  animation: slideUp 0.22s cubic-bezier(0.4,0,0.2,1);
  transition: background var(--transition), border-color var(--transition);
  max-height: 90vh;
  overflow-y: auto;
}

.warning-box  { text-align: center; max-width: 400px; }
.small-box    { text-align: center; max-width: 360px; }
.progress-box { max-width: 380px; }
.share-modal-box { max-width: 520px; }

.modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 22px; }
.modal-title  { font-size: 1.05rem; font-weight: 800; color: var(--text); }
.modal-icon   { font-size: 2.4rem; margin-bottom: 14px; }
.modal-text   { font-size: 0.85rem; color: var(--text-2); line-height: 1.75; margin-bottom: 12px; }
.modal-text strong { color: var(--text); font-weight: 700; }

/* ===== FORMS ===== */
.form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }

.form-label {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--text-2);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.form-input {
  padding: 10px 14px;
  background: var(--bg-3);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 500;
  outline: none;
  transition: all var(--transition);
  width: 100%;
}
.form-input::placeholder { color: var(--text-3); }
.form-input:focus { border-color: var(--accent); background: var(--bg-2); box-shadow: 0 0 0 3px var(--accent-soft); }
.form-input.error { border-color: var(--danger); box-shadow: 0 0 0 3px rgba(239,68,68,0.12); }

.type-toggle {
  display: flex;
  gap: 3px;
  background: var(--bg-3);
  padding: 4px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
}

.type-btn {
  flex: 1;
  padding: 8px;
  background: transparent;
  border: none;
  border-radius: var(--radius-xs);
  color: var(--text-2);
  font-family: var(--font);
  font-size: 0.84rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
}
.type-btn.active { background: linear-gradient(135deg, var(--accent), var(--amber)); color: white; box-shadow: 0 2px 8px rgba(249,115,22,0.28); }
.type-btn:hover:not(.active) { color: var(--text); background: var(--bg-4); }

.form-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 22px; }

/* Cover upload */
.cover-upload-area {
  border: 2px dashed var(--border-2);
  border-radius: var(--radius-sm);
  padding: 18px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  background: var(--bg-3);
}
.cover-upload-area:hover { border-color: var(--accent); background: var(--accent-soft); }
.cover-upload-area input { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
.cover-upload-text  { font-size: 0.82rem; color: var(--text-2); font-weight: 600; }
.cover-upload-sub   { font-size: 0.72rem; color: var(--text-3); margin-top: 3px; }

.cover-preview-area {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px;
  background: var(--bg-3);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
}
.cover-preview-thumb {
  width: 60px;
  height: 60px;
  object-fit: cover;
  border-radius: var(--radius-xs);
  flex-shrink: 0;
}
.cover-preview-info { flex: 1; min-width: 0; }
.cover-preview-name { font-size: 0.8rem; color: var(--text); font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cover-preview-size { font-size: 0.72rem; color: var(--text-3); margin-top: 2px; }
.cover-remove-btn {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1.5px solid color-mix(in srgb, var(--danger) 30%, transparent);
  border-radius: var(--radius-xs);
  padding: 5px 10px;
  font-size: 0.72rem;
  font-family: var(--font);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}
.cover-remove-btn:hover { background: var(--danger); color: white; }

/* ===== PROGRESS MODAL ===== */
.progress-display { margin-bottom: 20px; text-align: center; }

.progress-bar-large {
  width: 100%;
  height: 10px;
  background: var(--bg-4);
  border-radius: 100px;
  overflow: hidden;
  margin-bottom: 10px;
}

.progress-fill-large {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--amber));
  border-radius: 100px;
  transition: width 0.35s ease;
}

.progress-preview-text {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--accent);
  letter-spacing: -0.03em;
}

.page-input-row { display: flex; align-items: center; gap: 10px; }
.page-input-row .form-input { flex: 1; text-align: center; font-size: 1.1rem; font-weight: 700; }
.page-btn { flex-shrink: 0; width: 40px; height: 40px; }
.page-hint { font-size: 0.76rem; color: var(--text-3); text-align: center; font-weight: 500; margin-top: 4px; }

/* ===== SHARE MODAL ===== */
#share-canvas-wrap { display: flex; justify-content: center; margin-bottom: 18px; }
#share-canvas { border-radius: var(--radius-sm); box-shadow: var(--shadow); max-width: 100%; display: block; }
.share-hint { font-size: 0.78rem; color: var(--text-3); text-align: center; margin-bottom: 14px; font-weight: 500; }
.share-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

/* ===== FOOTER ===== */
.app-footer { padding: 14px 24px; border-top: 1px solid var(--border); text-align: center; transition: border-color var(--transition); }
.footer-text { font-size: 0.74rem; color: var(--text-3); font-weight: 500; }

/* ===== TOAST ===== */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-family: var(--font);
  font-weight: 700;
  z-index: 9999;
  box-shadow: var(--shadow);
  white-space: nowrap;
  animation: toastIn 0.22s cubic-bezier(0.4,0,0.2,1);
  max-width: calc(100vw - 40px);
  text-align: center;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn      { from { opacity:0; }              to { opacity:1; } }
@keyframes slideUp     { from { opacity:0; transform: translateY(20px) scale(0.98); } to { opacity:1; transform: translateY(0) scale(1); } }
@keyframes fadeSlideUp { from { opacity:0; transform: translateY(14px); } to { opacity:1; transform: translateY(0); } }
@keyframes toastIn     { from { opacity:0; transform: translateX(-50%) translateY(14px); } to { opacity:1; transform: translateX(-50%) translateY(0); } }

.book-card:nth-child(1)  { animation-delay:0.03s; }
.book-card:nth-child(2)  { animation-delay:0.06s; }
.book-card:nth-child(3)  { animation-delay:0.09s; }
.book-card:nth-child(4)  { animation-delay:0.12s; }
.book-card:nth-child(5)  { animation-delay:0.15s; }
.book-card:nth-child(6)  { animation-delay:0.18s; }
.book-card:nth-child(n+7){ animation-delay:0.2s;  }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--bg-4); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-2); }

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  .app-header  { padding: 12px 16px; }
  .app-name    { font-size: 1rem; }
  .controls-bar{ padding: 10px 16px; }
  .main-content{ padding: 16px; }
  .stats-bar   { padding: 10px 16px; gap: 8px; }
  .modal-box   { padding: 22px 18px; }
  .filter-tab  { padding: 5px 10px; font-size: 0.75rem; }
  .stat-chip   { padding: 5px 10px; font-size: 0.75rem; }
  .book-actions{ padding: 8px 12px 12px; }
}