/* ─── Reset & Base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  /* Main canvas */
  --bg: #f8f8f8;
  --bg-card: #ffffff;
  --bg-secondary: #1e1b2e;
  --bg-hover: #f0eeff;
  --border: #e4e2f0;
  --border-strong: #c4bfdc;
  /* Sidebar */
  --sidebar-bg: #1e1b2e;
  --sidebar-border: rgba(255,255,255,0.08);
  --sidebar-text: #d4cfee;
  --sidebar-text-muted: rgba(180,170,220,0.6);
  --sidebar-hover: rgba(255,255,255,0.07);
  --sidebar-active: rgba(139,92,246,0.25);
  --sidebar-active-text: #c4b5fd;
  /* Text */
  --text: #1c1830;
  --text-secondary: #6b648c;
  --text-tertiary: #a099be;
  /* Accent — purple */
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --accent-subtle: #ede9fe;
  --accent-text: #7c3aed;
  /* Tag pills */
  --tag-bg: #f0eeff;
  /* Misc */
  --shadow-sm: 0 1px 4px rgba(100,80,180,0.07);
  --shadow-md: 0 4px 20px rgba(100,80,180,0.10);
  --radius: 8px;
  --radius-lg: 12px;
  --sidebar-width: 240px;
  --topbar-height: 52px;
  --font: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
}

html, body { height: 100%; overflow: hidden; }
body { font-family: var(--font); font-size: 14px; color: var(--text); background: var(--bg); line-height: 1.5; }

/* ─── Layout ────────────────────────────────────────────────── */
#app { display: flex; height: 100vh; overflow: hidden; }

/* ─── Sidebar ───────────────────────────────────────────────── */
#sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
  transition: width 0.2s ease;
}
#sidebar.collapsed { width: 0; }

#sidebar-header {
  padding: 16px 16px 12px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--sidebar-border);
}
#sidebar-title {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
#sidebar-sub {
  font-size: 11px;
  color: var(--sidebar-text-muted);
  margin-top: 2px;
  white-space: nowrap;
}

#sidebar-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 8px 0;
}

.nav-bank {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  cursor: pointer;
  border-radius: 7px;
  margin: 0 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--sidebar-text);
  transition: background 0.1s;
  white-space: nowrap;
}
.nav-bank:hover { background: var(--sidebar-hover); }
.nav-bank.active { background: var(--sidebar-active); color: var(--sidebar-active-text); }
.nav-icon { width: 15px; height: 15px; flex-shrink: 0; opacity: 0.7; }
.nav-bank-count {
  margin-left: auto;
  background: rgba(255,255,255,0.1);
  color: var(--sidebar-text-muted);
  border-radius: 99px;
  font-size: 11px;
  padding: 1px 7px;
  font-weight: 500;
}

.nav-section-label {
  font-size: 10.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--sidebar-text-muted);
  padding: 12px 14px 4px;
}

/* Chapter tree */
.chapter-item {
  position: relative;
  user-select: none;
}
.chapter-row {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px 8px;
  margin: 0 8px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  color: var(--sidebar-text);
  transition: background 0.1s;
  min-width: 0;
}
.chapter-row:hover { background: var(--sidebar-hover); }
.chapter-row.active { background: var(--sidebar-active); color: var(--sidebar-active-text); font-weight: 500; }
.chapter-expand-btn {
  width: 16px; height: 16px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  color: var(--sidebar-text-muted);
  font-size: 10px;
  border-radius: 3px;
  transition: transform 0.15s;
}
.chapter-expand-btn.open { transform: rotate(90deg); }
.chapter-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
}
.chapter-count {
  font-size: 11px;
  color: var(--sidebar-text-muted);
  flex-shrink: 0;
}
.chapter-children { padding-left: 12px; }
.chapter-menu-btn {
  opacity: 0;
  flex-shrink: 0;
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  color: var(--text-tertiary);
  font-size: 13px;
  transition: opacity 0.1s;
}
.chapter-row:hover .chapter-menu-btn { opacity: 1; }

#add-chapter-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  margin: 4px 8px;
  font-size: 13px;
  color: var(--sidebar-text-muted);
  cursor: pointer;
  border-radius: 6px;
  border: none;
  background: none;
  width: calc(100% - 16px);
  transition: color 0.1s, background 0.1s;
}
#add-chapter-btn:hover { background: var(--sidebar-hover); color: var(--sidebar-text); }

#sidebar-footer {
  border-top: 1px solid var(--sidebar-border);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
}
.sidebar-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: background 0.1s;
  width: 100%;
  text-align: left;
}
.sidebar-btn-primary { background: var(--accent); color: white; }
.sidebar-btn-primary:hover { background: var(--accent-hover); }
.sidebar-btn-secondary { background: rgba(255,255,255,0.06); color: var(--sidebar-text); border: 1px solid var(--sidebar-border); }
.sidebar-btn-secondary:hover { background: rgba(255,255,255,0.1); color: #fff; }

/* ─── Main ──────────────────────────────────────────────────── */
#main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* ─── Topbar ────────────────────────────────────────────────── */
#topbar {
  height: var(--topbar-height);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 20px;
  flex-shrink: 0;
  background: var(--bg);
}
#sidebar-toggle {
  padding: 6px 8px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-tertiary);
  border-radius: 6px;
  font-size: 14px;
  flex-shrink: 0;
  transition: color 0.1s, background 0.1s;
}
#sidebar-toggle:hover { background: var(--bg-hover); color: var(--text); }
#topbar-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}
#topbar-sub {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 1px;
}

/* Search */
#search-wrap {
  margin-left: auto;
  position: relative;
  display: flex;
  align-items: center;
}
#search-icon {
  position: absolute;
  left: 10px;
  color: var(--text-tertiary);
  font-size: 13px;
  pointer-events: none;
}
#search-input {
  padding: 7px 12px 7px 32px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  width: 220px;
  background: var(--bg-card);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s, width 0.2s, background 0.15s;
}
#search-input:focus { border-color: var(--accent); background: var(--bg-card); width: 280px; box-shadow: 0 0 0 3px rgba(124,58,237,0.1); }
#search-input::placeholder { color: var(--text-tertiary); }
#search-clear {
  position: absolute;
  right: 8px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-tertiary);
  font-size: 14px;
  display: none;
  padding: 2px;
  border-radius: 4px;
}
#search-clear.visible { display: block; }

/* ─── Toolbar ───────────────────────────────────────────────── */
#toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}
.toolbar-btn {
  display: flex; align-items: center; gap: 5px;
  padding: 6px 10px;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  background: none;
  color: var(--text-secondary);
  transition: background 0.1s, color 0.1s;
  white-space: nowrap;
}
.toolbar-btn:hover { background: var(--bg-hover); color: var(--text); }
.toolbar-btn.active { background: var(--bg-hover); color: var(--text); }
.toolbar-btn-primary {
  background: var(--accent);
  color: white;
  padding: 6px 12px;
}
.toolbar-btn-primary:hover { background: var(--accent-hover); color: white; }
.toolbar-sep { width: 1px; height: 20px; background: var(--border); margin: 0 2px; flex-shrink: 0; }

/* Sort select */
#sort-select {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--bg);
  cursor: pointer;
  outline: none;
}
#sort-select:hover { border-color: var(--border-strong); color: var(--text); }

/* View toggle */
#view-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-left: auto;
}
.view-btn {
  padding: 5px 10px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-tertiary);
  transition: background 0.1s, color 0.1s;
}
.view-btn.active { background: var(--bg-hover); color: var(--text); }

/* ─── Tag Filter Bar ────────────────────────────────────────── */
#tag-filter-wrap {
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--bg);
}
#tag-filter-wrap.empty { display: none; }
#tag-filter-wrap.collapsed #tag-filter-bar { display: none; }
#tag-filter-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 20px;
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text-tertiary);
  cursor: pointer;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
  transition: color 0.1s;
}
#tag-filter-toggle:hover { color: var(--text-secondary); }
#tag-filter-toggle svg { transition: transform 0.15s; }
#tag-filter-wrap.collapsed #tag-filter-toggle svg { transform: rotate(-90deg); }
#tag-filter-bar {
  display: flex;
  align-items: flex-start;
  gap: 5px;
  padding: 0 20px 8px;
  flex-wrap: wrap;
}
.tag-pill {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  border: 1.5px solid transparent;
  background: var(--tag-bg);
  color: var(--text-secondary);
  white-space: nowrap;
  transition: all 0.1s;
  flex-shrink: 0;
}
.tag-pill:hover { border-color: var(--border-strong); color: var(--text); }
.tag-pill.active { border-color: var(--accent); color: var(--accent); background: var(--accent-subtle); }
.tag-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ─── Board ─────────────────────────────────────────────────── */
#board {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 20px;
}

/* Group block */
.group-block { margin-bottom: 28px; }
.group-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 0 8px;
  cursor: pointer;
  user-select: none;
}
.group-chev {
  font-size: 10px;
  color: var(--text-tertiary);
  transition: transform 0.15s;
  width: 14px;
  flex-shrink: 0;
}
.group-chev.closed { transform: rotate(-90deg); }
.group-name-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.group-count-badge {
  font-size: 11px;
  color: var(--text-tertiary);
}
.group-actions {
  margin-left: auto;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.1s;
}
.group-block:hover .group-actions { opacity: 1; }
.group-action-btn {
  padding: 3px 7px;
  border-radius: 5px;
  font-size: 12px;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--text-tertiary);
}
.group-action-btn:hover { background: var(--bg-hover); color: var(--text); }
.group-body.hidden { display: none; }

/* ─── Card Grid ─────────────────────────────────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
@media (max-width: 900px) { .card-grid { grid-template-columns: 1fr; } }

/* ─── List view ─────────────────────────────────────────────── */
.card-list-view { display: flex; flex-direction: column; gap: 2px; }

/* ─── Container Card ────────────────────────────────────────── */
.c-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s;
  position: relative;
  overflow: hidden;
  min-width: 0;
}
.c-card:hover { border-color: var(--accent); box-shadow: var(--shadow-sm); }
.c-card.selected { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(124,58,237,0.1); }

.c-card-label {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.c-card-rephrase {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 8px;
}
.c-card-source {
  font-size: 11.5px;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 8px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.c-card-source svg { flex-shrink: 0; }
.c-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
}
.c-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 99px;
  font-weight: 500;
  background: var(--tag-bg);
  color: var(--text-secondary);
}
.c-tag-dot { width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }

/* List row style */
.c-card.list-mode {
  border-radius: 6px;
  padding: 9px 14px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-left: 2px solid transparent;
}
.c-card.list-mode:hover { border-left-color: var(--border-strong); }
.c-card.list-mode .c-card-label {
  font-size: 13px;
  font-weight: 500;
  margin: 0;
  flex-shrink: 0;
  max-width: 280px;
  -webkit-line-clamp: 1;
}
.c-card.list-mode .c-card-rephrase {
  font-size: 12px;
  margin: 0;
  flex: 1;
  -webkit-line-clamp: 1;
  color: var(--text-tertiary);
}
.c-card.list-mode .c-card-source { margin: 0; flex-shrink: 0; }
.c-card.list-mode .c-card-tags { margin: 0; flex-shrink: 0; flex-wrap: nowrap; }

/* Chapter badges (bank view) */
.chapter-badge {
  font-size: 10.5px;
  background: var(--accent-subtle);
  color: var(--accent-text);
  border-radius: 4px;
  padding: 1px 6px;
  display: inline-block;
  margin-top: 5px;
}

/* ─── Modal ─────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(15,12,30,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
  backdrop-filter: blur(3px);
}
.modal-overlay.hidden { display: none; }
.modal {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: 0 20px 60px rgba(100,80,180,0.18);
  width: 100%;
  max-width: 620px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.modal-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.modal-title { font-size: 16px; font-weight: 600; }
.modal-close {
  background: none; border: none; cursor: pointer;
  font-size: 18px; color: var(--text-tertiary);
  padding: 4px 8px; border-radius: 6px;
}
.modal-close:hover { background: var(--bg-hover); color: var(--text); }
.modal-body {
  padding: 20px 24px;
  overflow-y: auto;
  flex: 1;
}
.modal-footer {
  padding: 14px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  flex-shrink: 0;
}

/* Form elements */
.form-field { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13.5px;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
  resize: none;
}
.form-input:focus, .form-textarea:focus, .form-select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(124,58,237,0.1); }
.form-textarea { min-height: 80px; line-height: 1.6; }

/* Source rows */
.source-row {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 8px;
  overflow: hidden;
}
.source-ref {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: #ede9fe;
  cursor: pointer;
}
.source-ref input {
  flex: 1;
  border: none;
  background: none;
  font-size: 13px;
  color: var(--text);
  font-family: var(--font);
  outline: none;
}
.source-quote-wrap { padding: 10px 12px; border-top: 1px solid var(--border); display: none; }
.source-quote-wrap.open { display: block; }
.source-quote {
  width: 100%;
  border: none;
  background: none;
  font-size: 12.5px;
  color: var(--text-secondary);
  font-family: var(--font);
  outline: none;
  resize: none;
  min-height: 60px;
  line-height: 1.6;
}
.source-del-btn {
  background: none; border: none; cursor: pointer;
  color: var(--text-tertiary); font-size: 14px; padding: 2px 4px;
  border-radius: 4px; flex-shrink: 0;
}
.source-del-btn:hover { color: #ef4444; background: #fef2f2; }
.add-source-btn {
  font-size: 12.5px;
  color: var(--text-tertiary);
  background: none;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 7px 12px;
  width: 100%;
  cursor: pointer;
  transition: all 0.1s;
}
.add-source-btn:hover { border-color: #7c3aed; color: #7c3aed; background: #ede9fe; }

/* Tag editor in modal */
.tag-editor { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 99px;
  font-size: 12px;
  font-weight: 500;
  background: var(--tag-bg);
  color: var(--text-secondary);
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: all 0.1s;
}
.tag-chip:hover { border-color: var(--border-strong); }
.tag-chip-del { font-size: 13px; color: var(--text-tertiary); margin-left: 2px; }
.tag-chip-del:hover { color: #ef4444; }
.tag-add-input {
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 4px 12px;
  font-size: 12px;
  font-family: var(--font);
  outline: none;
  width: 120px;
  color: var(--text);
}
.tag-add-input:focus { border-color: var(--border-strong); }

/* Buttons */
.btn {
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 13.5px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: all 0.1s;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: transparent; color: var(--text-secondary); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--bg-hover); color: var(--text); }
.btn-danger { background: #fef2f2; color: #dc2626; border: 1px solid #fecaca; }
.btn-danger:hover { background: #fee2e2; }

/* ─── Context Menu ───────────────────────────────────────────── */
#ctx-menu {
  position: fixed;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 4px;
  min-width: 170px;
  z-index: 2000;
  display: none;
}
#ctx-menu.visible { display: block; }
.ctx-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 5px;
  font-size: 13px;
  cursor: pointer;
  color: var(--text);
  transition: background 0.1s;
}
.ctx-item:hover { background: var(--bg-hover); }
.ctx-item.danger { color: #dc2626; }
.ctx-item.danger:hover { background: #fef2f2; }
.ctx-sep { height: 1px; background: var(--border); margin: 3px 0; }

/* ─── Empty state ───────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
  color: var(--text-tertiary);
}
.empty-state-icon { font-size: 32px; margin-bottom: 12px; display:flex; align-items:center; justify-content:center; color: var(--text-tertiary); }
.empty-state-icon svg { opacity: 0.5; }
@keyframes spin { to { transform: rotate(360deg); } }
.empty-state-icon svg.loading-spin { animation: spin 0.8s linear infinite; }
.empty-state-title { font-size: 15px; font-weight: 600; color: var(--text-secondary); margin-bottom: 6px; }
.empty-state-sub { font-size: 13px; }

/* ─── Density ───────────────────────────────────────────────── */
body.compact .c-card { padding: 8px 12px; }
body.compact .c-card-rephrase { -webkit-line-clamp: 1; }
body.compact .card-grid { gap: 6px; }

/* ─── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ─── Inline editable chapter name ──────────────────────────── */
.chapter-name-input {
  background: var(--sidebar-hover);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 13px;
  font-family: var(--font);
  color: var(--text);
  outline: none;
  width: 140px;
}

/* ─── Toast ─────────────────────────────────────────────────── */
#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--accent);
  color: white;
  padding: 9px 18px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
  z-index: 9999;
  white-space: nowrap;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ─── Detail drawer ─────────────────────────────────────────── */
#detail-drawer {
  width: 420px;
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  background: var(--bg);
  flex-shrink: 0;
  overflow: hidden;
  transition: width 0.2s;
}
#detail-drawer.hidden { width: 0; border-left: none; overflow: hidden; }
#detail-body { flex: 1; overflow-y: auto; padding: 20px; }
#detail-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
#detail-header-title { font-size: 14px; font-weight: 600; }

/* ─── Chapter drag-and-drop ─────────────────────────────────── */
.chapter-item.dragging { opacity: 0.4; }
.chapter-row.drag-over {
  background: var(--sidebar-active) !important;
  border-top: 2px solid #7c3aed;
  border-radius: 6px;
}

/* ─── Search highlight ──────────────────────────────────────── */
mark { background: #fef08a; border-radius: 2px; padding: 0 1px; }