/* ── Green + Black Theme ── */
:root {
  --bg: #080b09;
  --bg-sidebar: #0c100e;
  --bg-card: #111714;
  --bg-elevated: #161d19;
  --bg-hover: #1c2620;
  --text: #e8f2ec;
  --text-muted: #6b7f72;
  --accent: #22c55e;
  --accent-bright: #4ade80;
  --accent-dim: #16a34a;
  --accent-glow: rgba(34, 197, 94, 0.12);
  --accent-glow-strong: rgba(34, 197, 94, 0.25);
  --cyan: #06b6d4;
  --amber: #f59e0b;
  --purple: #a78bfa;
  --blue: #3b82f6;
  --danger: #ef4444;
  --border: rgba(34, 197, 94, 0.08);
  --border-strong: rgba(34, 197, 94, 0.18);
  --shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.35);
  --radius: 14px;
  --radius-sm: 8px;
  --sidebar-w: 248px;
  --font-display: 'Syne', system-ui, sans-serif;
  --font-body: 'Outfit', system-ui, sans-serif;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

body.light {
  --bg: #f0f4f1;
  --bg-sidebar: #ffffff;
  --bg-card: #ffffff;
  --bg-elevated: #f5f8f6;
  --bg-hover: #eaf0ec;
  --text: #0f1a14;
  --text-muted: #5a6e62;
  --accent: #16a34a;
  --accent-bright: #15803d;
  --accent-dim: #166534;
  --accent-glow: rgba(22, 163, 74, 0.1);
  --accent-glow-strong: rgba(22, 163, 74, 0.2);
  --border: rgba(15, 26, 20, 0.08);
  --border-strong: rgba(22, 163, 74, 0.25);
  --shadow: 0 8px 40px rgba(15, 26, 20, 0.1);
  --shadow-card: 0 4px 20px rgba(15, 26, 20, 0.07);
}

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

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.35s, color 0.35s;
}

/* ── App Shell ── */
.app-shell {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ── */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 200;
  transition: transform var(--transition);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.5rem 1.25rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-glow);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.brand-name {
  display: block;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.brand-tag {
  display: block;
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

.sidebar-nav {
  padding: 1.25rem 0.875rem 0.5rem;
}

.nav-label {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: 0 0.5rem;
  margin-bottom: 0.5rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 0.2rem;
  text-align: left;
}
.nav-item:hover {
  background: var(--bg-hover);
  color: var(--text);
}
.nav-item.active {
  background: var(--accent-glow);
  color: var(--accent-bright);
  border: 1px solid var(--border-strong);
}
.nav-item svg { flex-shrink: 0; opacity: 0.8; }
.nav-item.active svg { opacity: 1; }

.sidebar-sheets {
  flex: 1;
  padding: 0.75rem 0.875rem;
  overflow-y: auto;
}

.sidebar-sheet-list {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.sidebar-sheet-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
}
.sidebar-sheet-btn:hover {
  background: var(--bg-hover);
  color: var(--text);
}
.sidebar-sheet-btn.active {
  background: var(--bg-elevated);
  color: var(--accent-bright);
}

.sheet-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.sheet-dot.all { background: var(--accent); }
.sheet-dot.nontech { background: var(--amber); }
.sheet-dot.technical { background: var(--blue); }
.sheet-dot.english { background: var(--purple); }

.sheet-num {
  margin-left: auto;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-elevated);
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
}
.sidebar-sheet-btn.active .sheet-num {
  background: var(--accent-glow);
  color: var(--accent);
}

.sidebar-footer {
  padding: 1rem 0.875rem 1.25rem;
  border-top: 1px solid var(--border);
}

.btn-add {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.7rem 1rem;
  background: var(--accent);
  color: #052e16;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-add:hover {
  background: var(--accent-bright);
  box-shadow: 0 4px 20px var(--accent-glow-strong);
  transform: translateY(-1px);
}

.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 150;
  opacity: 0;
  transition: opacity var(--transition);
}
.sidebar-backdrop.visible { display: block; opacity: 1; }

/* ── Main Wrapper ── */
.main-wrapper {
  flex: 1;
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  width: calc(100% - var(--sidebar-w));
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* ── Topbar ── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.75rem;
  background: rgba(8, 11, 9, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  gap: 1rem;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.page-title {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.page-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.1rem;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.library-toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: opacity var(--transition);
  flex-wrap: wrap;
  justify-content: flex-end;
}
.library-toolbar.hidden {
  display: none;
}

.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.search-wrap svg {
  position: absolute;
  left: 0.75rem;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input, .sort-select {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.search-input {
  padding-left: 2.1rem;
  width: 200px;
}
.search-input:focus, .sort-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.view-toggle {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.view-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
}
.view-btn:hover { color: var(--text); background: var(--bg-hover); }
.view-btn.active {
  background: var(--accent-glow);
  color: var(--accent-bright);
}

.icon-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  transition: all var(--transition);
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent); }

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
body.light .theme-toggle .icon-sun { display: block; }
body.light .theme-toggle .icon-moon { display: none; }

body.light .topbar { background: rgba(240, 244, 241, 0.9); }
body.light .sidebar { box-shadow: 2px 0 16px rgba(15, 26, 20, 0.06); }

.mobile-only { display: none; }

/* ── Content ── */
.content {
  flex: 1;
  padding: 1.5rem 1.75rem 3rem;
  width: 100%;
  min-width: 0;
}

.view {
  display: none;
  animation: fadeIn 0.3s ease;
}
.view.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ── Dashboard Stats ── */
#view-dashboard .stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: all var(--transition);
  min-width: 0;
}
.stat-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}
.stat-card.highlight {
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(34, 197, 94, 0.06) 100%);
  border-color: var(--border-strong);
}

.stat-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.stat-icon-wrap {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--accent-glow);
  border: 1px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}
.stat-icon-wrap.blue { background: rgba(59,130,246,0.1); border-color: rgba(59,130,246,0.2); color: var(--blue); }
.stat-icon-wrap.amber { background: rgba(245,158,11,0.1); border-color: rgba(245,158,11,0.2); color: var(--amber); }
.stat-icon-wrap.purple { background: rgba(167,139,250,0.1); border-color: rgba(167,139,250,0.2); color: var(--purple); }

.stat-value {
  display: block;
  font-family: var(--font-body);
  font-size: 1.875rem;
  font-weight: 600;
  color: var(--accent-bright);
  line-height: 1.1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}
.stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 0.25rem;
  line-height: 1.3;
  word-break: break-word;
}

/* ── Analytics Grid ── */
#view-dashboard .analytics-grid {
  grid-template-columns: repeat(2, 1fr);
}
.analytics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color var(--transition);
  min-width: 0;
}
.panel:hover { border-color: var(--border-strong); }
.panel.wide { grid-column: 1 / -1; }

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}
.panel-header h2 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.panel-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}
.panel-badge.live {
  background: rgba(34, 197, 94, 0.15);
  color: var(--accent-bright);
  animation: pulse-live 2s ease infinite;
}
@keyframes pulse-live {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.65; }
}

/* ── Currently Reading ── */
.currently-reading-panel {
  margin-bottom: 1.5rem;
  border-color: var(--border-strong);
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(34, 197, 94, 0.04) 100%);
}
.currently-reading-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 0.875rem;
}
.reading-card {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  min-width: 0;
  width: 100%;
}
.reading-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
}
.reading-card.sheet-technical::before { background: var(--blue); }
.reading-card.sheet-english::before { background: var(--purple); }
.reading-card.sheet-nontech::before { background: var(--amber); }
.reading-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}
.reading-cover {
  flex-shrink: 0;
}
.reading-cover .book-cover--list {
  width: 52px;
  height: auto;
  box-shadow: var(--shadow-card);
}
.reading-info {
  flex: 1;
  min-width: 0;
  overflow: hidden;
}
.reading-title {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.3;
  margin-top: 0.2rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.reading-author {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}
.reading-progress-wrap { margin-top: 0.25rem; }
.reading-progress-bar {
  height: 6px;
  background: var(--bg-hover);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 0.3rem;
}
.reading-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-dim), var(--accent-bright));
  border-radius: 3px;
  transition: width 0.6s ease;
}
.reading-progress-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
}
.reading-pct {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--accent-bright);
  flex-shrink: 0;
  width: 40px;
  text-align: right;
  line-height: 1;
}
.reading-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-muted);
}
.reading-empty-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 0.5rem;
  opacity: 0.5;
}

.panel-badge {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid var(--border-strong);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
}

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: color var(--transition);
}
.link-btn:hover { color: var(--accent-bright); }

/* ── Charts ── */
.analytics-chart {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

.chart-row {
  display: grid;
  grid-template-columns: minmax(72px, 110px) minmax(0, 1fr) 40px;
  align-items: center;
  gap: 0.625rem;
}
.chart-row-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  min-width: 0;
  overflow: hidden;
}
.chart-row-label span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.chart-bar-track {
  height: 8px;
  background: var(--bg-elevated);
  border-radius: 4px;
  overflow: hidden;
}
.chart-bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.chart-val {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--accent);
  text-align: right;
  white-space: nowrap;
}

/* ── Purchase Ring ── */
.purchase-ring-wrap {
  display: flex;
  align-items: center;
  gap: 2rem;
  justify-content: center;
  padding: 0.5rem 0;
}

.purchase-ring {
  position: relative;
  width: 120px;
  height: 120px;
  flex-shrink: 0;
}
.purchase-ring svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}
.ring-bg {
  fill: none;
  stroke: var(--bg-elevated);
  stroke-width: 10;
}
.ring-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s cubic-bezier(0.4, 0, 0.2, 1);
}
.ring-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.ring-value {
  font-family: var(--font-body);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--accent-bright);
  line-height: 1;
}
.ring-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 0.15rem;
}

.purchase-legend {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}
.legend-item strong { color: var(--text); margin-left: 0.25rem; }
.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.legend-dot.green { background: var(--accent); }
.legend-dot.muted { background: var(--bg-elevated); border: 1px solid var(--border); }

/* ── Quick Stats ── */
#view-dashboard .quick-stats {
  grid-template-columns: repeat(4, 1fr);
}
.quick-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
}
.quick-stat {
  text-align: center;
  padding: 0.875rem 0.5rem;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  min-width: 0;
}
.quick-stat-value {
  display: block;
  font-family: var(--font-body);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--accent-bright);
  line-height: 1.1;
}
.quick-stat-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
  font-weight: 500;
  line-height: 1.3;
  word-break: break-word;
}

/* ── Recent Strip ── */
.recent-strip {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--accent-glow) transparent;
}

.recent-item {
  flex-shrink: 0;
  width: 100px;
  cursor: pointer;
  transition: transform var(--transition);
}
.recent-item .book-cover--thumb {
  width: 100px;
  max-width: 100px;
}
.recent-item:hover { transform: translateY(-4px); }

.recent-info {
  margin-top: 0.5rem;
}
.recent-title {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.3;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.recent-author {
  display: block;
  font-size: 0.65rem;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Library ── */
.load-more-btn {
  display: block;
  width: 100%;
  max-width: 320px;
  margin: 1.5rem auto 2rem;
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.load-more-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}
.load-more-btn.hidden { display: none; }

.library-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.library-count {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

.filter-bar {
  display: flex;
  gap: 0.4rem;
}
.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.35rem 0.875rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  font-family: var(--font-body);
  transition: all var(--transition);
}
.filter-btn:hover { border-color: var(--border-strong); color: var(--text); }
.filter-btn.active {
  background: var(--accent-glow);
  border-color: var(--accent);
  color: var(--accent-bright);
  font-weight: 600;
}

/* ── Book Grid ── */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(155px, 185px));
  gap: 1rem;
  justify-content: start;
}

.book-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 185px;
}
.book-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: var(--border-strong);
}

.book-card-cover {
  position: relative;
  padding: 1rem 0.875rem 0;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-shrink: 0;
}

/* ── Book Cover Sizes ── */
.book-cover {
  position: relative;
  border-radius: 6px;
  overflow: hidden;
  background: var(--bg-elevated);
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
  flex-shrink: 0;
}
.book-cover--card {
  width: 120px;
  max-width: 120px;
  aspect-ratio: 2/3;
}
.book-cover--list {
  width: 48px;
  max-width: 48px;
  aspect-ratio: 2/3;
  flex-shrink: 0;
}
.book-cover--thumb {
  width: 100px;
  max-width: 100px;
  aspect-ratio: 2/3;
  flex-shrink: 0;
}
.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.35s ease;
}
.book-card:hover .book-cover img { transform: scale(1.04); }

.book-cover .book-initials { display: none; }
.book-cover.cover-fallback .book-initials,
.book-cover:not(:has(img)) .book-initials {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  position: absolute;
  inset: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  opacity: 0.55;
  letter-spacing: 0.02em;
}

.format-pill {
  position: absolute;
  bottom: 0.4rem;
  right: 0.4rem;
  font-size: 0.55rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
  backdrop-filter: blur(8px);
  white-space: nowrap;
  line-height: 1.2;
}
.fmt-paperback { background: rgba(34,197,94,0.2); color: var(--accent-bright); border: 1px solid rgba(34,197,94,0.3); }
.fmt-hardcover { background: rgba(6,182,212,0.2); color: var(--cyan); border: 1px solid rgba(6,182,212,0.3); }

.book-info {
  padding: 0.75rem 0.875rem 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.book-title {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  letter-spacing: -0.01em;
}
.book-author {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.book-meta {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 0.5rem;
}

.sheet-badge {
  display: inline-block;
  font-size: 0.58rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 700;
  color: var(--accent);
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  padding: 0.12rem 0.4rem;
  border-radius: 4px;
  margin-bottom: 0.35rem;
  align-self: flex-start;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.purchased-badge, .copies-badge {
  font-size: 0.62rem;
  font-weight: 600;
  padding: 0.12rem 0.4rem;
  border-radius: 4px;
}
.purchased-badge.yes { background: rgba(34,197,94,0.12); color: var(--accent-bright); }
.purchased-badge.no  { background: rgba(239,68,68,0.1); color: var(--danger); }
.copies-badge { background: var(--accent-glow); color: var(--accent); border: 1px solid var(--border-strong); }

.book-card.sheet-technical { border-bottom: 2px solid var(--blue); }
.book-card.sheet-english   { border-bottom: 2px solid var(--purple); }
.book-card.sheet-nontech   { border-bottom: 2px solid var(--amber); }

/* ── Book List View ── */
.book-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.book-list-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}
.book-list-row:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
  transform: translateX(4px);
}
.book-list-row.sheet-technical { border-left: 3px solid var(--blue); }
.book-list-row.sheet-english   { border-left: 3px solid var(--purple); }
.book-list-row.sheet-nontech   { border-left: 3px solid var(--amber); }

.list-info {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  overflow: hidden;
}
.list-main {
  min-width: 0;
  flex: 1;
  overflow: hidden;
}
.list-main .book-title {
  font-size: 0.9375rem;
  -webkit-line-clamp: 1;
}
.list-main .book-author { margin-top: 0.1rem; }

.list-meta {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
  flex-wrap: nowrap;
  max-width: 45%;
  overflow: hidden;
}
.list-meta .sheet-badge,
.list-meta .format-pill,
.list-meta .purchased-badge,
.list-meta .copies-badge {
  flex-shrink: 0;
  white-space: nowrap;
}
.list-meta .sheet-badge { margin-bottom: 0; }
.list-meta .format-pill { position: static; }

.list-arrow {
  color: var(--text-muted);
  flex-shrink: 0;
  transition: color var(--transition), transform var(--transition);
}
.book-list-row:hover .list-arrow {
  color: var(--accent);
  transform: translateX(2px);
}

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  z-index: 300;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s, visibility 0.25s;
  padding: 1rem;
}
.modal-overlay.open { opacity: 1; visibility: visible; }

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: calc(var(--radius) + 2px);
  width: 100%;
  max-width: 460px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow);
  transform: translateY(20px) scale(0.98);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
.modal-overlay.open .modal { transform: translateY(0) scale(1); }

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
}
.modal-header h2 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
}

.modal-cover-preview {
  width: 90px;
  aspect-ratio: 2/3;
  margin: 0 auto 1.25rem;
  border-radius: 6px;
  overflow: hidden;
  background: var(--bg-elevated);
  box-shadow: var(--shadow-card);
  position: relative;
}
.modal-cover-preview img { width: 100%; height: 100%; object-fit: cover; display: block; }
.modal-cover-preview .book-initials { display: none; }
.modal-cover-preview.cover-fallback .book-initials {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.book-form { padding: 0 1.5rem 1.5rem; }
.book-form label {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  margin-bottom: 0.75rem;
}
.label-hint { text-transform: none; font-weight: 400; letter-spacing: 0; opacity: 0.7; }
.book-form input,
.book-form select {
  display: block;
  width: 100%;
  margin-top: 0.35rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.75rem;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.875rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.book-form input:focus,
.book-form select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.875rem;
}

.form-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.form-actions-right { display: flex; gap: 0.625rem; }

.btn-primary {
  background: var(--accent);
  color: #052e16;
  border: none;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.8125rem;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-primary:hover {
  background: var(--accent-bright);
  box-shadow: 0 4px 16px var(--accent-glow-strong);
}

.btn-secondary {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--text); }

.btn-danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid rgba(239,68,68,0.3);
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  cursor: pointer;
}

/* ── Empty & Loading ── */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}
.empty-icon { font-size: 2.5rem; display: block; margin-bottom: 0.75rem; opacity: 0.5; }
.empty-hint { font-size: 0.8125rem; margin-top: 0.35rem; color: var(--text-muted); }

.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}
.loading-overlay.visible { opacity: 1; visibility: visible; }

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.error-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--danger);
  color: white;
  text-align: center;
  padding: 0.75rem;
  font-size: 0.875rem;
  z-index: 600;
  transform: translateY(-100%);
  transition: transform 0.3s;
}
.error-banner.visible { transform: translateY(0); }

/* ── Responsive ── */
@media (max-width: 1100px) {
  #view-dashboard .stats-row { grid-template-columns: repeat(2, 1fr); }
  #view-dashboard .analytics-grid { grid-template-columns: 1fr; }
  #view-dashboard .quick-stats { grid-template-columns: repeat(2, 1fr); }
  .analytics-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open { transform: translateX(0); }
  .main-wrapper { margin-left: 0; }
  .mobile-only { display: flex; }
  .topbar { padding: 0.875rem 1rem; }
  .content { padding: 1rem; }
  .library-toolbar { flex-wrap: wrap; }
  .search-input { width: 160px; }
  .list-info { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .list-meta { display: none; }
  .book-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    justify-content: stretch;
  }
  .book-card { max-width: none; }
  #view-dashboard .stats-row { grid-template-columns: repeat(2, 1fr); }
  .currently-reading-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  #view-dashboard .stats-row { grid-template-columns: 1fr 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .stat-value { font-size: 1.75rem; }
  .form-row { grid-template-columns: 1fr; }
  .search-input { width: 130px; }
  .purchase-ring-wrap { flex-direction: column; gap: 1rem; }
}

/* ── Book Detail Panel ── */
.detail-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  z-index: 400;
  display: flex;
  justify-content: flex-end;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}
body.light .detail-overlay { background: rgba(15, 26, 20, 0.35); }
.detail-overlay.open { opacity: 1; visibility: visible; }

.detail-panel {
  width: min(680px, 100vw);
  height: 100vh;
  background: var(--bg);
  border-left: 1px solid var(--border-strong);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: -8px 0 40px rgba(0, 0, 0, 0.3);
}
body.light .detail-panel { box-shadow: -8px 0 40px rgba(15, 26, 20, 0.1); }
.detail-overlay.open .detail-panel { transform: translateX(0); }

.detail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
  flex-shrink: 0;
}
.detail-header-actions { display: flex; gap: 0.5rem; }

.btn-sm {
  padding: 0.4rem 0.875rem !important;
  font-size: 0.75rem !important;
}

.detail-content {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--accent-glow) transparent;
}

.detail-hero {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}
.detail-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-glow) 0%, transparent 60%);
  pointer-events: none;
}
.detail-hero.sheet-technical { border-left: 3px solid var(--blue); }
.detail-hero.sheet-english   { border-left: 3px solid var(--purple); }
.detail-hero.sheet-nontech   { border-left: 3px solid var(--amber); }

.detail-cover-wrap {
  flex-shrink: 0;
  width: 120px;
  position: relative;
  z-index: 1;
}
.detail-cover {
  width: 120px;
  aspect-ratio: 2/3;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: var(--shadow-card);
  display: block;
}
.detail-cover-fallback {
  width: 120px;
  aspect-ratio: 2/3;
  background: var(--bg-elevated);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  opacity: 0.6;
  box-shadow: var(--shadow-card);
}

.detail-hero-info {
  flex: 1;
  min-width: 0;
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-top: 0.25rem;
  overflow: hidden;
}
.detail-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-top: 0.25rem;
  word-break: break-word;
}
.detail-author {
  font-size: 0.9375rem;
  color: var(--text-muted);
}
.detail-isbn {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: monospace;
  margin-top: 0.25rem;
}
.detail-reading-progress {
  margin-top: 0.75rem;
  max-width: 280px;
}
.status-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  margin-top: 0.5rem;
}
.status-badge.status-reading { background: rgba(34,197,94,0.15); color: var(--accent-bright); border: 1px solid var(--border-strong); }
.status-badge.status-finished { background: rgba(167,139,250,0.15); color: var(--purple); }
.status-badge.status-want-to-read { background: rgba(245,158,11,0.15); color: var(--amber); }
.status-badge.status-dnf { background: rgba(239,68,68,0.1); color: var(--danger); }

.detail-stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 0.625rem;
  margin-bottom: 1.5rem;
}
.detail-stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.875rem 0.5rem;
  text-align: center;
  transition: border-color var(--transition);
  min-width: 0;
}
.detail-stat-card.highlight {
  background: linear-gradient(135deg, var(--bg-card), var(--accent-glow));
  border-color: var(--border-strong);
}
.detail-stat-card.positive .detail-stat-val { color: var(--accent-bright); }
.detail-stat-card.negative .detail-stat-val { color: var(--danger); }
.detail-stat-val {
  display: block;
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-bright);
  line-height: 1.1;
  overflow: hidden;
  text-overflow: ellipsis;
}
.detail-stat-lbl {
  display: block;
  font-size: 0.6rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 0.25rem;
  font-weight: 500;
  line-height: 1.3;
  word-break: break-word;
  hyphens: auto;
}

.detail-section { margin-bottom: 1.5rem; }
.detail-section.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.detail-section-title {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 0.875rem;
  color: var(--text);
}

.detail-insight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.875rem;
}
.detail-insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  min-width: 0;
}
.insight-header {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  margin-bottom: 1rem;
}
.insight-icon { font-size: 1.25rem; }
.insight-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
}
.insight-sub {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.1rem;
}

.detail-bars { display: flex; flex-direction: column; gap: 0.625rem; }
.detail-bar-row {
  display: grid;
  grid-template-columns: minmax(64px, 96px) minmax(0, 1fr) 48px;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0.375rem;
  border-radius: 6px;
  transition: background var(--transition);
}
.detail-bar-row.active {
  background: var(--accent-glow);
  border: 1px solid var(--border-strong);
}
.detail-bar-label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
  min-width: 0;
  overflow: hidden;
}
.detail-bar-label span:last-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.detail-bar-track {
  height: 6px;
  background: var(--bg-elevated);
  border-radius: 3px;
  overflow: hidden;
}
.detail-bar-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.detail-bar-fill.cyan { background: var(--cyan); }
.detail-bar-val {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  text-align: right;
}
.detail-bar-val small {
  font-weight: 500;
  color: var(--text-muted);
}

.detail-advanced-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.625rem;
}
.detail-advanced-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.875rem 0.5rem;
  text-align: center;
  transition: all var(--transition);
  min-width: 0;
}
.detail-advanced-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}
.adv-icon { font-size: 1.25rem; display: block; margin-bottom: 0.35rem; }
.adv-value {
  display: block;
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-bright);
  line-height: 1.1;
}
.adv-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 600;
  margin-top: 0.3rem;
  color: var(--text);
  line-height: 1.3;
  word-break: break-word;
}
.adv-hint {
  display: block;
  font-size: 0.6rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
  line-height: 1.35;
  word-break: break-word;
}

.detail-related-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.detail-related-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0.625rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}
.detail-related-item:hover {
  border-color: var(--border-strong);
  background: var(--bg-hover);
  transform: translateX(4px);
}
.detail-related-item .book-cover--thumb {
  width: 40px;
  flex-shrink: 0;
}
.detail-related-title {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.detail-related-author {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .detail-panel { width: 100vw; }
  .detail-hero { flex-direction: column; align-items: center; text-align: center; }
  .detail-stats-row { grid-template-columns: repeat(2, 1fr); }
  .detail-insight-grid { grid-template-columns: 1fr; }
  .detail-advanced-grid { grid-template-columns: repeat(2, 1fr); }
  .detail-section.two-col { grid-template-columns: 1fr; }
  .detail-bar-row { grid-template-columns: 90px 1fr 50px; }
}