/* ══════════════════════════════════════════════════════════════════
   Citation Generator PWA — styles.css
   Mobile-first, responsive, supports iOS/Android/tablet/desktop
   ══════════════════════════════════════════════════════════════════ */

/* ── CSS Variables ──────────────────────────────────────────────── */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #e0e7ff;
  --bg-app: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #263347;
  --bg-input: #0f172a;
  --border: #334155;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-light: #64748b;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --sidebar-w: 220px;
  --topbar-h: 56px;
  --bottomnav-h: 64px;
  --butter-w: 360px;
  --transition: 0.2s ease;
}

/* ── Reset ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-app);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── Scrollbars ─────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ══════════════════════════════════════════════════════════════════
   TOP BAR
   ══════════════════════════════════════════════════════════════════ */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  z-index: 50;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 16px;
  max-width: 1400px;
  margin: 0 auto;
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
}

.brand-icon { font-size: 1.3rem; }
.brand-version {
  font-size: 0.65rem;
  background: var(--primary-light);
  color: var(--primary);
  padding: 1px 6px;
  border-radius: 20px;
  font-weight: 600;
}

.topbar-butter-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}
.topbar-butter-btn:hover { background: var(--primary-dark); }

/* ══════════════════════════════════════════════════════════════════
   APP LAYOUT
   ══════════════════════════════════════════════════════════════════ */
.app-layout {
  display: flex;
  min-height: 100vh;
  padding-top: var(--topbar-h);
  padding-bottom: var(--bottomnav-h);
}

/* Sidebar hidden on mobile */
.sidebar {
  display: none;
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg-card);
  border-right: 1px solid var(--border);
  padding: 20px 12px;
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  bottom: 0;
  overflow-y: auto;
  flex-direction: column;
  gap: 8px;
  z-index: 30;
}

.sidebar-section { margin-bottom: 20px; }
.sidebar-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: 0 6px;
  margin-bottom: 8px;
}

.folder-list { list-style: none; }
.folder-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.folder-item.active { background: rgba(99,102,241,0.15); }
.folder-item-btn {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 8px;
  background: none;
  border: none;
  color: var(--text);
  font-size: 0.88rem;
  cursor: pointer;
  text-align: left;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.folder-item.active .folder-item-btn { color: var(--primary); font-weight: 600; }
.folder-item-btn:hover { background: rgba(255,255,255,0.05); }
.folder-item-actions { display: flex; gap: 2px; padding-right: 4px; opacity: 0; transition: opacity var(--transition); }
.folder-item:hover .folder-item-actions { opacity: 1; }
.btn-icon-tiny {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 3px;
  border-radius: 4px;
  font-size: 0.8rem;
  transition: color var(--transition);
}
.btn-icon-tiny:hover { color: var(--text); }
.btn-icon-tiny.del:hover { color: var(--danger); }

.btn-new-folder {
  width: 100%;
  padding: 7px;
  background: rgba(99,102,241,0.1);
  border: 1px dashed var(--border);
  color: var(--primary);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  cursor: pointer;
  transition: background var(--transition);
  margin-top: 6px;
}
.btn-new-folder:hover { background: rgba(99,102,241,0.2); }

.sidebar-butter { margin-top: auto; padding-top: 16px; }
.btn-butter-sidebar {
  width: 100%;
  padding: 9px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}
.btn-butter-sidebar:hover { background: var(--primary-dark); }

.sidebar-footer {
  padding-top: 12px;
  text-align: center;
  font-size: 0.7rem;
  color: var(--text-light);
  border-top: 1px solid var(--border);
  margin-top: 12px;
}

/* Main content */
.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  min-width: 0;
}

/* ══════════════════════════════════════════════════════════════════
   PANELS
   ══════════════════════════════════════════════════════════════════ */
.panel { max-width: 720px; margin: 0 auto; }
.panel.hidden { display: none; }

.panel-header {
  margin-bottom: 20px;
}
.panel-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.panel-header-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.format-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ══════════════════════════════════════════════════════════════════
   FORM ELEMENTS
   ══════════════════════════════════════════════════════════════════ */
.select-sm, input[type=text], input[type=date], input[type=search], textarea, select {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
  -webkit-appearance: none;
  appearance: none;
}
.select-sm { width: auto; cursor: pointer; }
input:focus, textarea:focus, select:focus { border-color: var(--primary); }
input::placeholder, textarea::placeholder { color: var(--text-light); }
textarea { resize: vertical; min-height: 70px; }

.form-section { margin-bottom: 16px; }
.form-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.form-section-header label { font-size: 0.85rem; font-weight: 600; color: var(--text-muted); }
.form-group { margin-bottom: 10px; }
.form-group label { display: block; font-size: 0.8rem; color: var(--text-muted); margin-bottom: 4px; }

.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }

/* Lookup row */
.lookup-row {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}
.lookup-row input { flex: 1; }
.btn-lookup {
  padding: 10px 16px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition);
  flex-shrink: 0;
}
.btn-lookup:hover { background: var(--primary-dark); }
.btn-lookup:disabled { opacity: 0.6; cursor: not-allowed; }

/* Author entries */
.author-entry {
  display: grid;
  grid-template-columns: 2fr 2fr 1fr auto;
  gap: 8px;
  align-items: end;
  margin-bottom: 8px;
  background: var(--bg-card);
  padding: 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.author-entry .form-group { margin-bottom: 0; }
.btn-remove-author {
  background: var(--bg-app);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  transition: all var(--transition);
  height: 38px;
  align-self: end;
}
.btn-remove-author:hover { background: var(--danger); color: white; border-color: var(--danger); }

.btn-add-author {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  padding: 2px 4px;
}

/* Form actions */
.form-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

/* Buttons */
.btn-primary {
  padding: 11px 20px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-primary.btn-full { flex: 1; }
.btn-primary.btn-sm { padding: 7px 14px; font-size: 0.82rem; }

.btn-secondary {
  padding: 11px 16px;
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition);
}
.btn-secondary:hover { background: var(--bg-card-hover); }
.btn-secondary.btn-sm { padding: 7px 14px; font-size: 0.82rem; }

/* ══════════════════════════════════════════════════════════════════
   PREVIEW CARD
   ══════════════════════════════════════════════════════════════════ */
.preview-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 8px;
}
.preview-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}
.preview-tabs .tab {
  flex: 1;
  padding: 10px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition);
}
.preview-tabs .tab.active {
  color: var(--primary);
  border-bottom: 2px solid var(--primary);
}
.preview-text { display: none; padding: 16px; font-size: 0.9rem; line-height: 1.7; min-height: 60px; }
.preview-text.active { display: block; }
.preview-text pre { white-space: pre-wrap; font-family: 'Courier New', monospace; font-size: 0.82rem; color: var(--text-muted); }
.preview-actions {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  justify-content: flex-end;
}

/* Source fields */
.source-fields.hidden { display: none; }

/* ══════════════════════════════════════════════════════════════════
   CITATIONS LIST PANEL
   ══════════════════════════════════════════════════════════════════ */
.citation-count {
  background: var(--primary);
  color: white;
  padding: 2px 8px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
}

.search-row { margin-bottom: 10px; }

.export-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.btn-export {
  padding: 6px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-export:hover { background: var(--primary); color: white; border-color: var(--primary); }

/* Alpha nav */
.alpha-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  padding: 8px 0;
  margin-bottom: 8px;
}
.alpha-btn {
  width: 26px;
  height: 26px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: not-allowed;
  opacity: 0.4;
}
.alpha-btn.has-items {
  color: var(--primary);
  border-color: var(--primary);
  opacity: 1;
  cursor: pointer;
}
.alpha-btn.has-items:hover { background: var(--primary); color: white; }

/* Letter groups */
.letter-group { margin-bottom: 20px; }
.letter-group-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.letter-badge {
  width: 28px;
  height: 28px;
  background: var(--primary);
  color: white;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  font-weight: 700;
  flex-shrink: 0;
}
.letter-line { flex: 1; height: 1px; background: var(--border); }

/* Citation cards */
.citation-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 10px;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.citation-card:hover { border-color: var(--primary); background: var(--bg-card-hover); }
.citation-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}
.citation-badges { display: flex; gap: 4px; flex-shrink: 0; }
.badge {
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
}
.badge-format { background: var(--primary-light); color: var(--primary); }
.badge-type { background: rgba(16,185,129,0.15); color: var(--success); }
.badge-notes { background: rgba(245,158,11,0.15); color: var(--warning); }
.citation-text {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
}
.citation-card-actions {
  display: flex;
  gap: 6px;
  margin-top: 10px;
  opacity: 0;
  transition: opacity var(--transition);
}
.citation-card:hover .citation-card-actions { opacity: 1; }
.btn-card-action {
  padding: 4px 10px;
  background: var(--bg-app);
  border: 1px solid var(--border);
  color: var(--text-muted);
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-card-action:hover { border-color: var(--primary); color: var(--primary); }
.btn-card-action.del:hover { border-color: var(--danger); color: var(--danger); }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}
.empty-state .es-icon { font-size: 3rem; margin-bottom: 12px; }
.empty-state h3 { margin-bottom: 6px; font-size: 1rem; }
.empty-state p { font-size: 0.85rem; }

/* ══════════════════════════════════════════════════════════════════
   FOLDERS PANEL (mobile full view)
   ══════════════════════════════════════════════════════════════════ */
.folder-list-full { list-style: none; }
.folder-full-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: border-color var(--transition);
}
.folder-full-item.active { border-color: var(--primary); }
.folder-full-item:hover { border-color: rgba(99,102,241,0.5); }
.folder-full-name { font-size: 0.92rem; font-weight: 500; display: flex; align-items: center; gap: 8px; }
.folder-full-count { font-size: 0.78rem; color: var(--text-muted); }
.folder-full-actions { display: flex; gap: 6px; }
.btn-folder-action {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 4px 6px;
  border-radius: 4px;
}
.btn-folder-action:hover { color: var(--text); background: rgba(255,255,255,0.05); }
.btn-folder-action.del:hover { color: var(--danger); }

/* ══════════════════════════════════════════════════════════════════
   BOTTOM NAV
   ══════════════════════════════════════════════════════════════════ */
.bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: var(--bottomnav-h);
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  display: flex;
  z-index: 50;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.nav-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition);
  padding: 8px 4px;
}
.nav-tab.active { color: var(--primary); }
.nav-icon { font-size: 1.3rem; line-height: 1; }
.nav-label { font-size: 0.68rem; font-weight: 600; }

/* ══════════════════════════════════════════════════════════════════
   BUTTER PANEL
   ══════════════════════════════════════════════════════════════════ */
.butter-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 98;
}
.butter-overlay.show { display: block; }

.butter-panel {
  position: fixed;
  top: 0;
  right: -100%;
  bottom: 0;
  width: min(var(--butter-w), 100vw);
  background: var(--bg-card);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 99;
  transition: right 0.3s ease;
}
.butter-panel.open { right: 0; }

.butter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.butter-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
}
.butter-icon { font-size: 1.3rem; }
.butter-subtitle { font-size: 0.72rem; color: var(--text-muted); font-weight: 400; }
.btn-close-panel {
  background: var(--bg-app);
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 30px;
  height: 30px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition);
}
.btn-close-panel:hover { color: var(--text); border-color: var(--text-muted); }

.butter-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Butter / AI message bubbles */
.ai-message { }
.ai-message.user { text-align: right; }
.ai-message .message-content {
  display: inline-block;
  max-width: 88%;
  padding: 10px 14px;
  border-radius: var(--radius-lg);
  font-size: 0.88rem;
  line-height: 1.6;
  text-align: left;
  word-break: break-word;
}
.ai-message.bot .message-content {
  background: var(--bg-app);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}
.ai-message.user .message-content {
  background: var(--primary);
  color: white;
  border-bottom-right-radius: 4px;
}
.ai-message .message-content p { margin-bottom: 0; }
.ai-message .message-content b { font-weight: 700; }
.ai-message .message-content code {
  background: rgba(99,102,241,0.15);
  color: var(--primary);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: monospace;
  font-size: 0.82em;
}

/* Typing indicator */
.typing-indicator {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 2px;
}
.typing-dot {
  width: 8px; height: 8px;
  background: var(--text-light);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite ease-in-out;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-7px); opacity: 1; }
}

.butter-quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.quick-action {
  padding: 5px 10px;
  font-size: 0.73rem;
  font-weight: 600;
  background: rgba(99,102,241,0.1);
  color: var(--primary);
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: 20px;
  cursor: pointer;
  transition: all var(--transition);
}
.quick-action:hover { background: var(--primary); color: white; }

.butter-input-row {
  display: flex;
  gap: 8px;
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  padding-bottom: calc(14px + env(safe-area-inset-bottom, 0px));
}
.butter-input-row input {
  flex: 1;
  padding: 9px 12px;
}
.btn-send {
  padding: 9px 12px;
  background: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  cursor: pointer;
  transition: background var(--transition);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn-send:hover { background: var(--primary-dark); }

/* ══════════════════════════════════════════════════════════════════
   MODALS
   ══════════════════════════════════════════════════════════════════ */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay.show { display: flex; }

.modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 100%;
  max-width: 420px;
  position: relative;
  max-height: 85vh;
  overflow-y: auto;
}
.modal-box.modal-wide { max-width: 600px; }
.modal-box h3 { font-size: 1rem; font-weight: 700; margin-bottom: 14px; }
.modal-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  justify-content: flex-end;
}
.modal-close-x {
  position: absolute;
  top: 14px; right: 14px;
  background: var(--bg-app);
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 28px; height: 28px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
}

/* Citation modal content */
.citation-detail-section { margin-bottom: 20px; }
.citation-detail-section h4 {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.citation-formatted { font-size: 0.9rem; line-height: 1.7; }
.abstract-text { font-size: 0.88rem; line-height: 1.7; color: var(--text-muted); }

/* ══════════════════════════════════════════════════════════════════
   TOAST
   ══════════════════════════════════════════════════════════════════ */
.toast {
  position: fixed;
  bottom: calc(var(--bottomnav-h) + 12px);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #1e2d3d;
  color: var(--text);
  padding: 10px 20px;
  border-radius: 24px;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--border);
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 500;
  pointer-events: none;
  white-space: nowrap;
  max-width: 90vw;
  text-align: center;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ══════════════════════════════════════════════════════════════════
   TABLET / DESKTOP
   ══════════════════════════════════════════════════════════════════ */
@media (min-width: 768px) {
  :root { --bottomnav-h: 0px; }

  .bottom-nav { display: none; }

  .sidebar {
    display: flex;
    position: fixed;
  }

  .app-layout {
    padding-left: var(--sidebar-w);
    padding-bottom: 0;
  }

  .main-content { padding: 24px 32px; }

  .panel { display: block !important; max-width: none; }
  .panel.hidden { display: none !important; }

  /* On desktop show form + citations side by side */
  .desktop-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: start;
  }

  .toast { bottom: 24px; }

  .author-entry { grid-template-columns: 2.5fr 2fr 1fr auto; }
}

@media (min-width: 1024px) {
  .main-content { padding: 28px 40px; }
}

@media (min-width: 1200px) {
  :root { --sidebar-w: 240px; }
}

/* ── Safe area for notch phones ─────────────────────────────────── */
@supports (padding-top: env(safe-area-inset-top)) {
  .topbar { padding-top: env(safe-area-inset-top, 0px); height: calc(var(--topbar-h) + env(safe-area-inset-top, 0px)); }
  .app-layout { padding-top: calc(var(--topbar-h) + env(safe-area-inset-top, 0px)); }
  .sidebar { top: calc(var(--topbar-h) + env(safe-area-inset-top, 0px)); }
}