:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-card-inner: #0f172a;
  --bg-hover: #334155;
  --border-color: #334155;
  --border-focus: #6366f1;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-primary: #6366f1;
  --accent-hover: #4f46e5;
  --accent-glow: rgba(99, 102, 241, 0.2);

  --btn-difficult: #ef4444;
  --btn-difficult-bg: rgba(239, 68, 68, 0.15);
  --btn-difficult-border: #dc2626;

  --btn-hard: #f59e0b;
  --btn-hard-bg: rgba(245, 158, 11, 0.15);
  --btn-hard-border: #d97706;

  --btn-good: #10b981;
  --btn-good-bg: rgba(16, 185, 129, 0.15);
  --btn-good-border: #059669;

  --btn-easy: #0ea5e9;
  --btn-easy-bg: rgba(14, 165, 233, 0.15);
  --btn-easy-border: #0284c7;

  --level-beginner: #34d399;
  --level-intermediate: #fbbf24;
  --level-advanced: #f87171;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
  --shadow-modal: 0 25px 50px -12px rgba(0, 0, 0, 0.75);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

/* Header & Top Bar */
.app-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 40;
  padding: 0.75rem 1.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  font-size: 1.75rem;
  background: linear-gradient(135deg, #6366f1, #a855f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-text h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

.brand-text p {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

select, input[type="text"], input[type="number"] {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.15s ease;
}

select:focus, input:focus {
  border-color: var(--border-focus);
}

.btn-header {
  background-color: var(--bg-hover);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s ease;
}

.btn-header:hover {
  background-color: #475569;
  border-color: #64748b;
}

.btn-open-cat-modal {
  font-weight: 600;
  gap: 0.55rem;
}

.btn-open-cat-modal.is-filtered {
  background: rgba(99, 102, 241, 0.22);
  border-color: rgba(99, 102, 241, 0.65);
  color: #e0e7ff;
}

.btn-open-cat-modal.is-filtered:hover {
  background: rgba(99, 102, 241, 0.35);
  border-color: #818cf8;
}

/* Secondary Toolbar: Filters & Progress */
.toolbar-bar {
  background-color: rgba(30, 41, 59, 0.7);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.6rem 1.5rem;
}

.toolbar-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.deck-tabs {
  display: flex;
  gap: 0.4rem;
}

.deck-tab {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.deck-tab:hover {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.05);
}

.deck-tab.active {
  background-color: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
}

.stats-summary {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.825rem;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.stat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}
.stat-dot.due { background-color: #ef4444; box-shadow: 0 0 6px rgba(239, 68, 68, 0.6); }
.stat-dot.learning { background-color: #f59e0b; }
.stat-dot.mastered { background-color: #10b981; }
.stat-dot.total { background-color: #6366f1; }

.stat-val {
  font-weight: 700;
  color: var(--text-primary);
}

/* Main Flashcard Stage */
.main-stage {
  flex: 1;
  max-width: 900px;
  width: 100%;
  margin: 1.5rem auto;
  padding: 0 1rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.card-viewport {
  position: relative;
  width: 100%;
}

.flashcard {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card-header {
  padding: 1rem 1.5rem;
  background-color: rgba(15, 23, 42, 0.5);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.card-badges {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.badge-category {
  background-color: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.badge-beginner {
  background-color: rgba(52, 211, 153, 0.15);
  color: var(--level-beginner);
  border: 1px solid rgba(52, 211, 153, 0.3);
}

.badge-intermediate {
  background-color: rgba(251, 191, 36, 0.15);
  color: var(--level-intermediate);
  border: 1px solid rgba(251, 191, 36, 0.3);
}

.badge-advanced {
  background-color: rgba(248, 113, 113, 0.15);
  color: var(--level-advanced);
  border: 1px solid rgba(248, 113, 113, 0.3);
}

.card-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.card-body {
  padding: 2rem 2rem 1.5rem 2rem;
  min-height: 220px;
}

.question-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.question-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.question-text {
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-primary);
}

/* Front Reveal Action */
.reveal-action-container {
  padding: 1.5rem 2rem 2rem 2rem;
  display: flex;
  justify-content: center;
}

.btn-reveal {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: white;
  border: none;
  font-size: 1.05rem;
  font-weight: 600;
  padding: 0.85rem 2.5rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  box-shadow: 0 4px 14px var(--accent-glow);
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn-reveal:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.btn-reveal:active {
  transform: translateY(0);
}

.kbd-badge {
  background: rgba(255, 255, 255, 0.2);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-family: monospace;
}

/* Back Answer Section */
.answer-section {
  display: none;
  border-top: 1px dashed var(--border-color);
  background-color: var(--bg-card-inner);
  padding: 1.75rem 2rem 2rem 2rem;
  animation: fadeIn 0.25s ease-out;
}

.answer-section.revealed {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.answer-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.answer-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: #38bdf8;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.answer-text {
  font-size: 1.05rem;
  color: #e2e8f0;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

/* Explanation Button */
.explanation-btn-wrapper {
  margin-bottom: 1.75rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-explanation {
  background-color: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.4);
  color: #a5b4fc;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.btn-explanation:hover {
  background-color: rgba(99, 102, 241, 0.28);
  border-color: #818cf8;
  color: #ffffff;
  transform: translateY(-1px);
}

/* Rating Controls */
.rating-container {
  border-top: 1px solid var(--border-color);
  padding-top: 1.25rem;
}

.rating-header {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.85rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.rating-buttons-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.btn-rate {
  border-radius: var(--radius-md);
  padding: 0.75rem 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  cursor: pointer;
  transition: all 0.15s ease;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-rate:hover {
  transform: translateY(-2px);
}

.btn-rate .rate-title {
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.btn-rate .rate-interval {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.15rem 0.5rem;
  border-radius: 12px;
}

.btn-rate .rate-key {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: monospace;
}

.btn-rate.difficult {
  border-color: var(--btn-difficult-border);
  background: var(--btn-difficult-bg);
}
.btn-rate.difficult:hover { background-color: rgba(239, 68, 68, 0.3); }
.btn-rate.difficult .rate-title { color: var(--btn-difficult); }
.btn-rate.difficult .rate-interval { background: rgba(239, 68, 68, 0.25); color: #fca5a5; }

.btn-rate.hard {
  border-color: var(--btn-hard-border);
  background: var(--btn-hard-bg);
}
.btn-rate.hard:hover { background-color: rgba(245, 158, 11, 0.3); }
.btn-rate.hard .rate-title { color: var(--btn-hard); }
.btn-rate.hard .rate-interval { background: rgba(245, 158, 11, 0.25); color: #fde68a; }

.btn-rate.good {
  border-color: var(--btn-good-border);
  background: var(--btn-good-bg);
}
.btn-rate.good:hover { background-color: rgba(16, 185, 129, 0.3); }
.btn-rate.good .rate-title { color: var(--btn-good); }
.btn-rate.good .rate-interval { background: rgba(16, 185, 129, 0.25); color: #a7f3d0; }

.btn-rate.easy {
  border-color: var(--btn-easy-border);
  background: var(--btn-easy-bg);
}
.btn-rate.easy:hover { background-color: rgba(14, 165, 233, 0.3); }
.btn-rate.easy .rate-title { color: var(--btn-easy); }
.btn-rate.easy .rate-interval { background: rgba(14, 165, 233, 0.25); color: #bae6fd; }

/* Sub Navigation */
.card-subnav {
  margin-top: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.btn-subnav {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.btn-subnav:hover {
  color: var(--text-primary);
  background-color: var(--bg-secondary);
}

/* Modal Styling */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.modal-overlay.open,
#category-modal.open {
  display: flex !important;
  opacity: 1 !important;
  visibility: visible !important;
  pointer-events: auto !important;
}

.modal-content {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-modal);
  width: 100%;
  max-width: 760px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: modalScaleUp 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalScaleUp {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: rgba(15, 23, 42, 0.5);
}

.modal-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.modal-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.btn-close-modal {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.btn-close-modal:hover {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.1);
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
  flex: 1;
  font-size: 1rem;
  line-height: 1.7;
}

.modal-q-context {
  background-color: var(--bg-card-inner);
  border-left: 3px solid var(--accent-primary);
  padding: 0.75rem 1rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.explanation-body-text {
  color: #e2e8f0;
}

.explanation-body-text code {
  background-color: rgba(15, 23, 42, 0.8);
  color: #f43f5e;
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: monospace;
}

.explanation-body-text pre code {
  display: block;
  background-color: #0b1120;
  color: #38bdf8;
  padding: 1rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 1rem 0;
  border: 1px solid var(--border-color);
}

.modal-footer {
  padding: 0.9rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  background-color: rgba(15, 23, 42, 0.5);
}

/* Empty State / Session Complete */
.empty-state {
  display: none;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  box-shadow: var(--shadow-card);
}

.empty-state.visible {
  display: block;
}

.empty-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

.empty-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.empty-subtitle {
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto 1.5rem auto;
}

/* Footer: Reschedule Settings */
.app-footer {
  margin-top: auto;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 1.5rem 2rem 1.5rem;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.footer-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  background-color: var(--bg-card-inner);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  border-radius: var(--radius-md);
}

.setting-card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.setting-label {
  font-size: 0.8rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.setting-label.difficult { color: var(--btn-difficult); }
.setting-label.hard { color: var(--btn-hard); }
.setting-label.good { color: var(--btn-good); }
.setting-label.easy { color: var(--btn-easy); }

.setting-inputs {
  display: flex;
  gap: 0.5rem;
}

.setting-inputs input[type="number"] {
  width: 80px;
}

.setting-inputs select {
  flex: 1;
}

.footer-bottom-row {
  margin-top: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-sync-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
}

.sync-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #10b981;
}

.footer-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn-ghost {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-ghost:hover {
  color: var(--text-primary);
  background-color: var(--bg-hover);
}

.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: #10b981;
  color: white;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
  font-size: 0.9rem;
  font-weight: 600;
  display: none;
  z-index: 200;
  animation: slideInUp 0.2s ease-out;
}

@keyframes slideInUp {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Card Browser Drawer */
.browser-drawer {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 100;
  justify-content: flex-end;
}

.browser-drawer.open {
  display: flex;
}

.drawer-panel {
  width: 100%;
  max-width: 650px;
  height: 100%;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  animation: slideDrawer 0.25s ease-out;
}

@keyframes slideDrawer {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

.drawer-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-body {
  padding: 1.25rem 1.5rem;
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.drawer-card-item {
  background-color: var(--bg-card-inner);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.drawer-card-item:hover {
  border-color: var(--accent-primary);
  transform: translateX(3px);
}

.drawer-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.drawer-item-q {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Collections & Presets Modal (2-Column Desktop, Stacked Mobile) */
#category-modal .modal-content {
  max-width: 960px;
  height: 88vh;
  max-height: 88vh;
}

.cat-modal-split-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
  height: 100%;
}

.cat-modal-sidebar {
  width: 290px;
  background-color: rgba(15, 23, 42, 0.5);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
}

.cat-sidebar-header {
  padding: 1rem 1.25rem 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.cat-sidebar-title {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-new-preset-sm {
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.4);
  color: #c7d2fe;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}
.btn-new-preset-sm:hover {
  background-color: var(--accent-primary);
  color: white;
}

/* Inline New Preset Creator in Sidebar */
.inline-preset-creator {
  display: none;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.85rem 1.25rem;
  background-color: rgba(30, 41, 59, 0.85);
  border-bottom: 1px solid var(--border-color);
  animation: fadeIn 0.15s ease-out;
}
.inline-preset-creator.visible {
  display: flex;
}
.inline-preset-creator input {
  width: 100%;
  font-size: 0.85rem;
  padding: 0.35rem 0.6rem;
}

.cat-presets-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.6rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.preset-nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  user-select: none;
}
.preset-nav-item:hover {
  background-color: var(--bg-hover);
}
.preset-nav-item.active {
  background-color: rgba(99, 102, 241, 0.18);
  border-color: rgba(99, 102, 241, 0.5);
  color: #ffffff;
}

.preset-nav-left {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  overflow: hidden;
  font-size: 0.85rem;
  font-weight: 500;
}
.preset-nav-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.preset-nav-right {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.btn-delete-preset-row {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.1rem 0.3rem;
  font-size: 0.85rem;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease;
}
.preset-nav-item:hover .btn-delete-preset-row {
  opacity: 1;
}
.btn-delete-preset-row:hover {
  color: #ef4444;
}

/* Main Collections Area (Right) */
.cat-modal-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: var(--bg-card-inner);
}

.cat-main-search-bar {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-card-inner);
}

.cat-search-box-modal {
  display: flex;
  align-items: center;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.75rem;
  gap: 0.5rem;
}
.cat-search-box-modal:focus-within {
  border-color: var(--border-focus);
}
.cat-search-box-modal input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
}

.cat-main-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1.25rem;
  background-color: rgba(15, 23, 42, 0.4);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.8rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.cat-main-list-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.cat-item-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.12s ease;
  user-select: none;
  gap: 0.6rem;
}
.cat-item-card:hover {
  border-color: #475569;
  background-color: #243048;
}
.cat-item-card.selected {
  background-color: rgba(99, 102, 241, 0.12);
  border-color: rgba(99, 102, 241, 0.45);
}

.cat-item-card-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  overflow: hidden;
  flex: 1;
}
.cat-item-card-left input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent-primary);
  cursor: pointer;
  flex-shrink: 0;
}

.cat-item-card-name {
  font-size: 0.85rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 500;
}
.cat-item-card-name mark {
  background-color: rgba(234, 179, 8, 0.35);
  color: #fef08a;
  padding: 0 2px;
  border-radius: 2px;
}

.cat-item-card-right {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.cat-action-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}
.cat-action-btn:hover {
  background-color: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

.cat-badge-count {
  font-size: 0.7rem;
  color: var(--text-muted);
  background-color: rgba(15, 23, 42, 0.6);
  padding: 0.1rem 0.4rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
}

.cat-badge-due {
  font-size: 0.7rem;
  color: #fca5a5;
  background-color: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  padding: 0.1rem 0.4rem;
  border-radius: 10px;
}

.cat-btn-only {
  font-size: 0.68rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  opacity: 0;
  transition: all 0.15s ease;
}
.cat-item-card:hover .cat-btn-only {
  opacity: 1;
}
.cat-btn-only:hover {
  background-color: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

.cat-empty-search {
  padding: 2.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Active Category Chip */
.active-category-chip {
  display: none;
  align-items: center;
  gap: 0.4rem;
  background-color: rgba(99, 102, 241, 0.18);
  border: 1px solid rgba(99, 102, 241, 0.38);
  color: #c7d2fe;
  font-size: 0.78rem;
  padding: 0.25rem 0.65rem;
  border-radius: 20px;
  max-width: 320px;
}

.active-category-chip.visible {
  display: inline-flex;
}

.active-category-chip .chip-icon {
  font-size: 0.85rem;
}

.active-category-chip #active-category-chip-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 500;
  cursor: pointer;
}

.active-category-chip button {
  background: transparent;
  border: none;
  color: #a5b4fc;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0 0.15rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.active-category-chip button:hover {
  color: #ef4444;
}

@media (max-width: 768px) {
  .cat-modal-split-layout {
    flex-direction: column;
  }
  .cat-modal-sidebar {
    width: 100%;
    max-height: 220px;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
  }
}

/* Responsive */
@media (max-width: 768px) {
  .header-container { flex-direction: column; align-items: stretch; }
  .toolbar-container { flex-direction: column; align-items: stretch; }
  .rating-buttons-grid { grid-template-columns: repeat(2, 1fr); }
  .card-body { padding: 1.5rem 1.25rem; }
  .answer-section { padding: 1.5rem 1.25rem; }
  .settings-grid { grid-template-columns: 1fr; }
}

/* ==========================================================================
   AI Flashcard Tutor Chat Modal & Buttons
   ========================================================================== */

/* Buttons on Card */
.btn-card-ai-header {
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.45);
  color: #c7d2fe;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all 0.2s ease;
  margin-right: 0.4rem;
}

.btn-card-ai-header:hover {
  background: rgba(99, 102, 241, 0.25);
  border-color: #818cf8;
  color: #ffffff;
  transform: translateY(-1px);
}

.btn-card-delete-header {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.4);
  color: #fca5a5;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all 0.2s ease;
  margin-right: 0.5rem;
}

.btn-card-delete-header:hover {
  background: rgba(239, 68, 68, 0.25);
  border-color: #ef4444;
  color: #ffffff;
  transform: translateY(-1px);
}

.btn-ai-chat {
  background-color: rgba(139, 92, 246, 0.16) !important;
  border: 1px solid rgba(139, 92, 246, 0.45) !important;
  color: #c4b5fd !important;
}

.btn-ai-chat:hover {
  background-color: rgba(139, 92, 246, 0.3) !important;
  border-color: #a78bfa !important;
  color: #ffffff !important;
}

/* Modal Content Size */
.ai-chat-modal-content {
  max-width: 860px;
  height: 88vh;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: var(--bg-card);
}

.ai-chat-modal-header {
  padding: 1rem 1.4rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}

.ai-avatar-badge {
  font-size: 1.5rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.35);
  border-radius: var(--radius-md);
}

.ai-title-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.ai-key-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.55rem;
  border-radius: 9999px;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #6ee7b7;
  cursor: pointer;
  transition: all 0.15s ease;
}

.ai-key-pill:hover {
  background: rgba(16, 185, 129, 0.28);
}

.ai-key-pill.warning {
  background: rgba(245, 158, 11, 0.15);
  border-color: rgba(245, 158, 11, 0.4);
  color: #fcd34d;
}

.ai-key-pill.danger {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.4);
  color: #fca5a5;
}

.ai-model-badge {
  font-family: monospace;
  font-size: 0.72rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  background: rgba(99, 102, 241, 0.14);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
}

.ai-chat-subtitle {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
  max-width: 520px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ai-header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-icon-subtle {
  background: var(--bg-card-inner);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-icon-subtle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

/* Multi-Key Management Panel */
.ai-key-panel {
  background: rgba(15, 23, 42, 0.95);
  border-bottom: 1px solid var(--border-color);
  padding: 1.1rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  animation: modalScaleUp 0.15s ease;
}

.ai-key-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.ai-key-subtext {
  font-size: 0.75rem;
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.1);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.ai-key-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.ai-key-desc a {
  color: #818cf8;
  text-decoration: underline;
}

.ai-keys-textarea {
  width: 100%;
  font-family: monospace;
  font-size: 0.8rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
  resize: vertical;
}

.ai-keys-textarea:focus {
  outline: none;
  border-color: var(--border-focus);
}

.ai-key-actions-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.ai-keys-summary {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.ai-keys-list-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  max-height: 100px;
  overflow-y: auto;
}

.key-preview-pill {
  font-size: 0.72rem;
  font-family: monospace;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.key-preview-pill.active {
  border-color: #10b981;
  background: rgba(16, 185, 129, 0.15);
  color: #6ee7b7;
}

.key-preview-pill.rate-limited {
  border-color: #f59e0b;
  background: rgba(245, 158, 11, 0.15);
  color: #fcd34d;
}

/* Context Banner & Accordion */
.ai-context-banner {
  background: rgba(30, 41, 59, 0.7);
  border-bottom: 1px solid var(--border-color);
  padding: 0.55rem 1.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.ai-context-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.context-indicator-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.8);
}

.btn-context-toggle {
  background: transparent;
  border: none;
  color: #818cf8;
  font-size: 0.75rem;
  cursor: pointer;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

.btn-context-toggle:hover {
  background: rgba(99, 102, 241, 0.15);
  color: #c7d2fe;
}

.ai-context-preview-body {
  background: var(--bg-card-inner);
  border-bottom: 1px solid var(--border-color);
  padding: 0.9rem 1.4rem;
  max-height: 180px;
  overflow-y: auto;
  font-size: 0.82rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.context-preview-section {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.context-preview-label {
  font-weight: 700;
  color: #a5b4fc;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.context-preview-content {
  color: var(--text-primary);
  line-height: 1.4;
  white-space: pre-wrap;
  font-family: inherit;
}

/* Live Chat Messages Area */
.ai-chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.25rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  background-color: var(--bg-card);
}

.ai-message {
  display: flex;
  gap: 0.75rem;
  max-width: 90%;
  animation: fadeIn 0.15s ease-out;
}

.ai-message.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.ai-message.assistant {
  align-self: flex-start;
  max-width: 94%;
}

.ai-msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.ai-message.user .ai-msg-avatar {
  background: rgba(99, 102, 241, 0.2);
  border: 1px solid rgba(99, 102, 241, 0.4);
}

.ai-message.assistant .ai-msg-avatar {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.35);
}

.ai-msg-body {
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  line-height: 1.6;
  word-break: break-word;
}

.ai-message.user .ai-msg-body {
  background: rgba(99, 102, 241, 0.22);
  border: 1px solid rgba(99, 102, 241, 0.5);
  color: #f1f5f9;
  border-bottom-right-radius: 3px;
}

.ai-message.assistant .ai-msg-body {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-bottom-left-radius: 3px;
}

/* Assistant Markdown Styling */
.ai-msg-body pre {
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  overflow-x: auto;
  margin: 0.6rem 0;
  font-family: 'Consolas', 'Fira Code', monospace;
  font-size: 0.85rem;
  line-height: 1.45;
  color: #e2e8f0;
}

.ai-msg-body code {
  font-family: 'Consolas', 'Fira Code', monospace;
  background: rgba(15, 23, 42, 0.6);
  padding: 0.15rem 0.35rem;
  border-radius: 3px;
  font-size: 0.85rem;
  color: #38bdf8;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.ai-msg-body pre code {
  background: transparent;
  padding: 0;
  border: none;
  color: inherit;
}

.ai-msg-body strong {
  color: #ffffff;
}

/* Typing Indicator Animation */
.ai-typing-indicator {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 0.75rem 1rem;
}

.ai-typing-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #818cf8;
  animation: typingPulse 1.4s infinite ease-in-out both;
}

.ai-typing-dot:nth-child(1) { animation-delay: -0.32s; }
.ai-typing-dot:nth-child(2) { animation-delay: -0.16s; }
.ai-typing-dot:nth-child(3) { animation-delay: 0s; }

@keyframes typingPulse {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40% { transform: scale(1); opacity: 1; }
}

/* Suggestion Chips */
.ai-prompt-chips {
  padding: 0.5rem 1.4rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
  background: rgba(15, 23, 42, 0.4);
  border-top: 1px solid var(--border-color);
}

.chips-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.ai-chip {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: #cbd5e1;
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.ai-chip:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: #818cf8;
  color: #ffffff;
  transform: translateY(-1px);
}

/* Rotation Toast Banner */
.ai-rotation-banner {
  background: rgba(245, 158, 11, 0.15);
  border-top: 1px solid rgba(245, 158, 11, 0.4);
  border-bottom: 1px solid rgba(245, 158, 11, 0.4);
  color: #fde68a;
  padding: 0.45rem 1.4rem;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: fadeIn 0.2s ease;
}

/* Input Area */
.ai-chat-input-container {
  padding: 0.85rem 1.4rem 1rem 1.4rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.ai-input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 0.6rem;
  background-color: var(--bg-card-inner);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.75rem;
  transition: border-color 0.2s ease;
}

.ai-input-wrapper:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 1px var(--border-focus);
}

.ai-chat-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.92rem;
  line-height: 1.5;
  resize: none;
  max-height: 140px;
  outline: none;
}

.btn-ai-send {
  background: var(--btn-good-border);
  border: none;
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.15s ease;
  flex-shrink: 0;
}

.btn-ai-send:hover:not(:disabled) {
  background: #059669;
  transform: translateY(-1px);
}

.btn-ai-send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.ai-input-footnote {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-secondary);
  padding: 0 0.25rem;
}

/* ==========================================================================
   Create New Card Modal & AI Workflow Styles
   ========================================================================== */

.btn-create-card {
  background: rgba(16, 185, 129, 0.15) !important;
  border: 1px solid rgba(16, 185, 129, 0.45) !important;
  color: #6ee7b7 !important;
  font-weight: 600 !important;
}

.btn-create-card:hover {
  background: rgba(16, 185, 129, 0.28) !important;
  border-color: #34d399 !important;
  color: #ffffff !important;
  transform: translateY(-1px);
}

.create-card-modal-content {
  max-width: 900px;
  height: 90vh;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: var(--bg-card);
}

.create-card-title-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.create-card-subtitle {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

.create-card-modal-body {
  overflow-y: auto;
  padding: 1.4rem 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.create-card-grid-row {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

@media (max-width: 640px) {
  .create-card-grid-row {
    flex-direction: column;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-group.flex-1 {
  flex: 1;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.form-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.label-hint {
  font-size: 0.75rem;
  font-weight: normal;
  color: var(--text-secondary);
}

.label-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
  font-family: inherit;
  font-size: 0.92rem;
  line-height: 1.5;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 1px var(--border-focus);
}

.form-textarea {
  resize: vertical;
  min-height: 70px;
}

.question-input-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.btn-generate-ai {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  color: #ffffff;
  border: none;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  transition: all 0.15s ease;
  box-shadow: 0 2px 6px rgba(79, 70, 229, 0.3);
}

.btn-generate-ai:hover:not(:disabled) {
  opacity: 0.95;
  transform: translateY(-1px);
  box-shadow: 0 4px 10px rgba(79, 70, 229, 0.45);
}

.btn-generate-ai:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.create-card-loading-state {
  background: rgba(99, 102, 241, 0.12);
  border: 1px dashed rgba(99, 102, 241, 0.5);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: #c7d2fe;
  font-size: 0.85rem;
  animation: fadeIn 0.15s ease;
}

.markdown-preview-box {
  background: var(--bg-card-inner);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.15rem;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-primary);
  max-height: 280px;
  overflow-y: auto;
  word-break: break-word;
}

.markdown-preview-box pre {
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  overflow-x: auto;
  margin: 0.6rem 0;
  font-family: monospace;
  font-size: 0.85rem;
  color: #e2e8f0;
}

.markdown-preview-box code {
  font-family: monospace;
  background: rgba(15, 23, 42, 0.6);
  padding: 0.15rem 0.35rem;
  border-radius: 3px;
  font-size: 0.85rem;
  color: #38bdf8;
}

.btn-subtle-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-subtle-toggle:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.btn-subtle-toggle.active {
  background: rgba(99, 102, 241, 0.2);
  border-color: #818cf8;
  color: #c7d2fe;
}

/* Refinement Panel */
.refinement-panel {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(139, 92, 246, 0.35);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.refinement-header {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.refinement-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: #c4b5fd;
}

.refinement-subtitle {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.refinement-input-row {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

.btn-refine-ai {
  background: rgba(139, 92, 246, 0.22);
  border: 1px solid rgba(139, 92, 246, 0.55);
  color: #c4b5fd;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.15s ease;
}

.btn-refine-ai:hover:not(:disabled) {
  background: rgba(139, 92, 246, 0.38);
  color: #ffffff;
  border-color: #a78bfa;
  transform: translateY(-1px);
}

.btn-refine-ai:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.refinement-chips {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.refine-chip {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: #cbd5e1;
  font-size: 0.73rem;
  padding: 0.22rem 0.6rem;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.refine-chip:hover {
  background: rgba(139, 92, 246, 0.22);
  border-color: #a78bfa;
  color: #ffffff;
  transform: translateY(-1px);
}

/* Post-Save Success Banner */
.create-card-success-banner {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.4);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  color: #6ee7b7;
  animation: fadeIn 0.15s ease;
}

.success-message {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.success-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.create-card-footer {
  padding: 1rem 1.6rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  background-color: var(--bg-secondary);
}