/* ==========================================================================
   DevPilot-AI - DSA Roadmap Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. DSA Layout & Container
   -------------------------------------------------------------------------- */
.dsa-page-container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   2. Global Progress Dashboard Hero Card
   -------------------------------------------------------------------------- */
.dsa-hero-card {
  background: var(--color-surface);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.dsa-hero-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #4F46E5 0%, #7C3AED 50%, #10B981 100%);
}

.dsa-hero-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.dsa-hero-title-group {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.dsa-hero-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.dsa-hero-stats-count {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-on-surface);
  line-height: 1.1;
  font-family: 'Plus Jakarta Sans', sans-serif;
}

.dsa-hero-stats-label {
  font-size: 0.8125rem;
  color: var(--color-on-surface-variant);
  font-weight: 500;
  margin-top: 2px;
}

.dsa-hero-pct-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.4rem 0.875rem;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.9375rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(79, 70, 229, 0.15);
}

/* Master Progress Bar */
.dsa-progress-track {
  width: 100%;
  height: 10px;
  background: var(--color-surface-container);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
  margin-bottom: 1.5rem;
}

.dsa-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #4F46E5 0%, #7C3AED 50%, #10B981 100%);
  border-radius: var(--radius-full);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0%;
}

/* Difficulty Chips Grid */
.dsa-diff-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.dsa-diff-card {
  padding: 0.875rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.dsa-diff-card.diff-easy {
  background: #f0fdf4;
  border-color: #bbf7d0;
}

.dsa-diff-card.diff-medium {
  background: #fffbeb;
  border-color: #fef08a;
}

.dsa-diff-card.diff-hard {
  background: #fef2f2;
  border-color: #fecaca;
}

.dsa-diff-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.dsa-diff-label {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.diff-easy .dsa-diff-label { color: #15803d; }
.diff-medium .dsa-diff-label { color: #b45309; }
.diff-hard .dsa-diff-label { color: #b91c1c; }

.dsa-diff-count {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-on-surface);
}

.dsa-diff-mini-track {
  width: 100%;
  height: 5px;
  background: rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.dsa-diff-mini-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.35s ease;
  width: 0%;
}

.diff-easy .dsa-diff-mini-fill { background-color: #16a34a; }
.diff-medium .dsa-diff-mini-fill { background-color: #d97706; }
.diff-hard .dsa-diff-mini-fill { background-color: #dc2626; }

/* --------------------------------------------------------------------------
   3. Workspace Layout (Sticky Index Sidebar + Main Question Feed)
   -------------------------------------------------------------------------- */
.dsa-workspace {
  display: grid;
  grid-template-columns: 290px 1fr;
  gap: 2rem;
  align-items: start;
}

/* Sidebar Index */
.dsa-nav-sidebar {
  position: sticky;
  top: 96px;
  background: var(--color-surface);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1rem;
  box-shadow: var(--shadow-subtle);
  max-height: calc(100vh - 120px);
  display: flex;
  flex-direction: column;
}

.dsa-nav-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.5rem 0.875rem 0.5rem;
  border-bottom: 1px solid var(--color-outline-variant);
  margin-bottom: 0.75rem;
}

.dsa-nav-sidebar-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-on-surface);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dsa-nav-sidebar-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  background: var(--color-surface-container);
  color: var(--color-on-surface-variant);
  border-radius: var(--radius-full);
}

.dsa-nav-slider-wrapper {
  display: contents;
}

.dsa-nav-arrow {
  display: none !important;
}

.dsa-nav-list {
  overflow-y: auto;
  scroll-behavior: smooth;
  padding-right: 4px;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1;
  min-height: 0;
}

.dsa-nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-md);
  color: var(--color-on-surface-variant);
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
  border-left: 2px solid transparent;
}

.dsa-nav-item:hover {
  background: var(--color-surface-container);
  color: var(--color-primary);
}

.dsa-nav-item.is-active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
  border-left-color: var(--color-primary);
}

.dsa-nav-item-left {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

.dsa-nav-num {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-outline);
  width: 18px;
  text-align: right;
  flex-shrink: 0;
}

.dsa-nav-item.is-active .dsa-nav-num {
  color: var(--color-primary);
}

.dsa-nav-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
  color: var(--color-on-surface);
}

.dsa-nav-item:hover .dsa-nav-name,
.dsa-nav-item.is-active .dsa-nav-name {
  color: var(--color-primary);
}

.dsa-nav-count {
  font-size: 0.725rem;
  font-weight: 600;
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-full);
  background: var(--color-surface-container);
  color: var(--color-on-surface-variant);
  flex-shrink: 0;
}

.dsa-nav-item.is-active .dsa-nav-count {
  background: rgba(79, 70, 229, 0.15);
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   4. Controls Toolbar (Pro Search, Quick Chips, Filters, Reset)
   -------------------------------------------------------------------------- */
.dsa-toolbar {
  background: var(--color-surface);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-lg);
  padding: 1.125rem 1.25rem;
  box-shadow: var(--shadow-subtle);
  margin-bottom: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  transition: all var(--transition-normal);
  overflow: hidden;
  min-width: 0;
  max-width: 100%;
  width: 100%;
  box-sizing: border-box;
}

.dsa-toolbar-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.875rem;
}

/* Smart Command-Bar Search Box */
.dsa-search-wrap {
  position: relative;
  flex: 1;
  min-width: 260px;
  max-width: 480px;
  display: flex;
  align-items: center;
}

.dsa-search-icon {
  position: absolute;
  left: 0.95rem;
  top: 50%;
  transform: translateY(-50%);
  color: #94a3b8;
  font-size: 20px;
  pointer-events: none;
  transition: color var(--transition-fast);
  z-index: 2;
}

.dsa-search-wrap input.dsa-search-input {
  width: 100% !important;
  padding-left: 2.75rem !important;
  padding-right: 4.5rem !important;
  padding-top: 0.6rem !important;
  padding-bottom: 0.6rem !important;
  background: #ffffff !important;
  border: 1.5px solid var(--color-outline-variant) !important;
  border-radius: 12px !important;
  font-size: 0.875rem !important;
  line-height: 1.4 !important;
  color: var(--color-on-surface) !important;
  outline: none !important;
  box-shadow: none !important;
  transition: all var(--transition-fast) !important;
}

.dsa-search-wrap input.dsa-search-input::placeholder {
  color: #94a3b8;
  font-weight: 400;
}

.dsa-search-wrap input.dsa-search-input:focus {
  border-color: #4F46E5 !important;
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15), 0 2px 8px rgba(79, 70, 229, 0.08) !important;
}

.dsa-search-wrap:focus-within .dsa-search-icon {
  color: #4F46E5;
}

.dsa-search-right-actions {
  position: absolute;
  right: 0.65rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  z-index: 2;
}

.dsa-search-kbd {
  display: inline-flex;
  align-items: center;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.6875rem;
  font-weight: 700;
  color: #94a3b8;
  background: #f1f5f9;
  border: 1px solid #e2e8f0;
  padding: 0.15rem 0.45rem;
  border-radius: 6px;
  pointer-events: none;
  user-select: none;
  transition: all var(--transition-fast);
}

.dsa-search-clear {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #f1f5f9;
  border: none;
  color: #64748b;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dsa-search-clear.visible {
  display: inline-flex;
}

.dsa-search-clear:hover {
  background: #fee2e2;
  color: #ef4444;
}

/* Segmented Filter Pills */
.dsa-segmented-group {
  display: inline-flex;
  background: var(--color-surface-container);
  padding: 3px;
  border-radius: var(--radius-md);
  gap: 2px;
}

.dsa-segment-btn {
  border: none;
  background: transparent;
  padding: 0.35rem 0.75rem;
  border-radius: calc(var(--radius-md) - 2px);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-on-surface-variant);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.dsa-segment-btn:hover {
  color: var(--color-on-surface);
}

.dsa-segment-btn.active {
  background: var(--color-surface);
  color: var(--color-primary);
  font-weight: 600;
  box-shadow: var(--shadow-subtle);
}

.dsa-toolbar-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Quick Suggestions Bar */
.dsa-toolbar-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--color-outline-variant);
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow: hidden;
  box-sizing: border-box;
}

.dsa-quick-chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  min-width: 0;
  max-width: 100%;
  box-sizing: border-box;
}

.dsa-quick-chips-label {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: #94a3b8;
  margin-right: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.dsa-chip-btn {
  border: 1px solid #e2e8f0;
  background: #f8fafc;
  color: #475569;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dsa-chip-btn:hover {
  background: #eef2ff;
  border-color: #c7d2fe;
  color: #4338ca;
  transform: translateY(-1px);
}

.dsa-chip-btn.active {
  background: #4f46e5;
  border-color: #4f46e5;
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(79, 70, 229, 0.25);
}

.dsa-results-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: #4f46e5;
  background: #eef2ff;
  border: 1px solid #e0e7ff;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

/* Matching Text Highlight */
.dsa-search-highlight {
  background: #fef08a;
  color: #854d0e;
  padding: 0 2px;
  border-radius: 2px;
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   5. Category Card & Pattern Sections
   -------------------------------------------------------------------------- */
.dsa-category-card {
  background: var(--color-surface);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  margin-bottom: 2rem;
  overflow: hidden;
  scroll-margin-top: 100px;
  transition: border-color var(--transition-normal);
}

.dsa-category-card:hover {
  border-color: rgba(79, 70, 229, 0.25);
}

.dsa-category-header {
  padding: 1.5rem 1.5rem 1.25rem 1.5rem;
  background: linear-gradient(180deg, var(--color-surface-container-low) 0%, var(--color-surface) 100%);
  border-bottom: 1px solid var(--color-outline-variant);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.dsa-category-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.dsa-category-index-badge {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 800;
  font-size: 0.9375rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Plus Jakarta Sans', sans-serif;
  flex-shrink: 0;
}

.dsa-category-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-on-surface);
  font-family: 'Plus Jakarta Sans', sans-serif;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dsa-category-desc {
  font-size: 0.8125rem;
  color: var(--color-on-surface-variant);
  margin-top: 0.2rem;
}

.dsa-category-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.875rem;
  background: var(--color-surface-container);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-on-surface);
}

.dsa-category-meta-badge.all-solved {
  background: #ecfdf5;
  color: #059669;
  border: 1px solid #a7f3d0;
}

/* Subpattern Group */
.dsa-pattern-group {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-outline-variant);
}

.dsa-pattern-group:last-child {
  border-bottom: none;
}

.dsa-pattern-group-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.dsa-pattern-title-area {
  display: flex;
  align-items: baseline;
  gap: 0.625rem;
}

.dsa-pattern-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-on-surface);
}

.dsa-pattern-tip {
  font-size: 0.8125rem;
  color: var(--color-on-surface-variant);
}

.dsa-pattern-count-badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  background: var(--color-surface-container);
  color: var(--color-on-surface-variant);
}

/* --------------------------------------------------------------------------
   6. Question Row Styles
   -------------------------------------------------------------------------- */
.dsa-question-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.dsa-question-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.dsa-question-row:hover {
  background: var(--color-surface-container-low);
  border-color: #cbd5e1;
  transform: translateY(-1px);
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.04);
}

/* Solved State */
.dsa-question-row.is-solved {
  background: #f8fafc;
  border-color: #e2e8f0;
}

.dsa-question-row.is-solved .dsa-question-title {
  color: #64748b;
}

/* Left part of row */
.dsa-question-left {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  min-width: 0;
  flex: 1;
}

/* Custom Checkbox */
.dsa-checkbox-container {
  position: relative;
  display: flex;
  align-items: center;
  cursor: pointer;
  flex-shrink: 0;
  user-select: none;
}

.dsa-checkbox-input {
  opacity: 0;
  position: absolute;
  width: 0;
  height: 0;
  pointer-events: none;
}

.dsa-checkbox-custom {
  width: 20px;
  height: 20px;
  border-radius: 6px;
  border: 2px solid var(--color-outline);
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.dsa-checkbox-container:hover .dsa-checkbox-custom {
  border-color: var(--color-primary);
}

.dsa-checkbox-input:checked ~ .dsa-checkbox-custom,
.dsa-checkbox-custom.dsa-checkbox-checked {
  background: #10B981;
  border-color: #10B981;
}

.dsa-checkbox-custom.dsa-checkbox-cross {
  background: #fef2f2;
  border-color: #f87171;
}

.dsa-checkbox-custom::after {
  content: '';
  display: none;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translate(-1px, -1px);
}

.dsa-checkbox-input:checked ~ .dsa-checkbox-custom::after,
.dsa-checkbox-custom.dsa-checkbox-checked::after {
  display: block;
}

/* Problem Number Badge */
.dsa-lc-num {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-outline);
  background: var(--color-surface-container);
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  min-width: 44px;
  text-align: center;
  flex-shrink: 0;
}

/* Problem Content & Meta */
.dsa-question-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 0;
  flex: 1;
}

.dsa-question-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.dsa-question-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-on-surface);
  line-height: 1.35;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dsa-question-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem;
}

.dsa-tag-ds,
.dsa-tag-pattern {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: 0.725rem;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.dsa-tag-ds {
  background: #EEF2FF;
  color: #4338CA;
  border: 1px solid #E0E7FF;
}

.dsa-tag-pattern {
  background: #F1F5F9;
  color: #475569;
  border: 1px solid #E2E8F0;
}

.dsa-question-row.is-solved .dsa-tag-ds {
  background: #F8FAFC;
  color: #64748B;
  border-color: #E2E8F0;
}

.dsa-question-row.is-solved .dsa-tag-pattern {
  background: #F8FAFC;
  color: #94A3B8;
  border-color: #E2E8F0;
}

/* Right part of row */
.dsa-question-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

/* Difficulty Badges */
.dsa-badge-diff {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
  text-transform: capitalize;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.dsa-badge-easy {
  background: #dcfce7;
  color: #15803d;
}

.dsa-badge-medium {
  background: #fef3c7;
  color: #b45309;
}

.dsa-badge-hard {
  background: #fee2e2;
  color: #b91c1c;
}

/* Question Explain Button (Opens Clean 15-Point Code Explanation) */
.dsa-btn-explain {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.38rem 0.85rem;
  background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: var(--radius-md);
  color: #ffffff;
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(79, 70, 229, 0.15);
}

.dsa-btn-explain:hover {
  background: linear-gradient(135deg, #4338ca 0%, #4f46e5 100%);
  box-shadow: 0 3px 8px rgba(79, 70, 229, 0.28);
  transform: translateY(-1px);
}

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

.dsa-btn-explain .material-symbols-outlined {
  font-size: 15px;
  transition: transform var(--transition-fast);
}

.dsa-btn-explain:hover .material-symbols-outlined {
  transform: scale(1.1);
}

/* Primary Internal Solve Button */
.dsa-btn-solve {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.38rem 0.85rem;
  background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
  border: 1px solid rgba(79, 70, 229, 0.2);
  border-radius: var(--radius-md);
  color: #ffffff;
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(79, 70, 229, 0.15);
}

.dsa-btn-solve:hover {
  background: linear-gradient(135deg, #4338ca 0%, #4f46e5 100%);
  box-shadow: 0 3px 8px rgba(79, 70, 229, 0.28);
  transform: translateY(-1px);
}

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

.dsa-btn-solve .material-symbols-outlined {
  font-size: 15px;
  transition: transform var(--transition-fast);
}

.dsa-btn-solve:hover .material-symbols-outlined {
  transform: translateX(2px);
}

/* Secondary direct LeetCode icon button */
.dsa-btn-lc-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-outline-variant);
  background: var(--color-surface-container);
  color: var(--color-on-surface-variant);
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.dsa-btn-lc-icon:hover {
  background: #fff7ed;
  border-color: #fed7aa;
  color: #ea580c;
  transform: translateY(-1px);
}

.dsa-btn-lc-icon .material-symbols-outlined {
  font-size: 15px;
}

/* External LeetCode Action Button */
.dsa-btn-leetcode {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  background: var(--color-surface-container);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-md);
  color: var(--color-on-surface-variant);
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.dsa-btn-leetcode:hover {
  background: #fff7ed;
  border-color: #fed7aa;
  color: #ea580c;
  transform: translateY(-1px);
}

.dsa-btn-leetcode .material-symbols-outlined {
  font-size: 16px;
}

/* --------------------------------------------------------------------------
   7. Empty States & Search Results Info
   -------------------------------------------------------------------------- */
.dsa-empty-state {
  padding: 3.5rem 1.5rem;
  text-align: center;
  background: var(--color-surface);
  border: 1px dashed var(--color-outline-variant);
  border-radius: var(--radius-lg);
  margin-bottom: 2rem;
}

.dsa-empty-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1rem;
  background: var(--color-surface-container);
  color: var(--color-outline);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

.dsa-empty-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-on-surface);
  margin-bottom: 0.35rem;
}

.dsa-empty-desc {
  font-size: 0.875rem;
  color: var(--color-on-surface-variant);
  max-width: 400px;
  margin: 0 auto 1.25rem;
}

/* --------------------------------------------------------------------------
   9. Responsive Breakpoints
   -------------------------------------------------------------------------- */
/* Large Tablet / Small Desktop */
@media (max-width: 1099px) {
  .dsa-workspace {
    grid-template-columns: 100%;
    gap: 1.25rem;
    min-width: 0;
    max-width: 100%;
    overflow: hidden;
  }

  .dsa-nav-sidebar {
    position: sticky;
    top: 0;
    z-index: 30;
    background: var(--color-surface);
    border: 1px solid var(--color-outline-variant);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.05);
    max-height: none;
    padding: 0.625rem 0.875rem;
    overflow: hidden;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    box-sizing: border-box;
  }

  .dsa-nav-sidebar-header {
    padding: 0 0.25rem 0.35rem 0.25rem;
    margin-bottom: 0.35rem;
  }

  .dsa-nav-slider-wrapper {
    display: flex;
    align-items: center;
    position: relative;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    overflow: hidden;
    gap: 0.35rem;
  }

  .dsa-nav-arrow {
    display: flex !important;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    min-width: 32px;
    border-radius: var(--radius-full);
    background: #ffffff;
    border: 1px solid var(--color-outline-variant);
    color: var(--color-on-surface);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
    z-index: 5;
  }

  .dsa-nav-arrow:hover {
    background: #eef2ff;
    color: var(--color-primary);
    border-color: var(--color-primary);
    transform: scale(1.05);
  }

  .dsa-nav-arrow:active {
    transform: scale(0.95);
  }

  .dsa-nav-arrow .material-symbols-outlined {
    font-size: 18px;
  }

  .dsa-nav-list,
  .dsa-nav-list.dsa-nav-slider {
    display: flex !important;
    flex-direction: row !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
    flex-wrap: nowrap !important;
    gap: 0.5rem;
    padding: 0.25rem 0.25rem 0.35rem 0.25rem;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    flex: 1 1 0% !important;
    min-width: 0 !important;
    width: auto !important;
    scrollbar-width: none;
  }

  .dsa-nav-list::-webkit-scrollbar,
  .dsa-nav-list.dsa-nav-slider::-webkit-scrollbar {
    display: none;
  }

  .dsa-nav-item {
    flex-shrink: 0;
    white-space: nowrap;
  }

  .dsa-toolbar {
    overflow: hidden;
    min-width: 0;
    max-width: 100%;
    width: 100%;
    box-sizing: border-box;
  }

  .dsa-toolbar-bottom {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.625rem;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    overflow: hidden;
    box-sizing: border-box;
  }

  .dsa-quick-chips {
    display: flex;
    overflow-x: auto;
    overflow-y: hidden;
    flex-wrap: nowrap;
    gap: 0.35rem;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    box-sizing: border-box;
  }

  .dsa-quick-chips::-webkit-scrollbar {
    display: none;
  }

  .dsa-chip-btn {
    flex-shrink: 0;
    white-space: nowrap;
  }

  .dsa-quick-chips-label {
    flex-shrink: 0;
    white-space: nowrap;
  }

  .dsa-search-counter {
    display: flex;
    justify-content: flex-end;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    box-sizing: border-box;
  }
}

/* Tablet & Mobile Screens */
@media (max-width: 768px) {
  #main-content {
    padding: 1rem 0.875rem !important;
  }

  .page-title {
    font-size: 1.5rem !important;
    line-height: 1.25 !important;
  }

  .page-subtitle {
    font-size: 0.8125rem !important;
  }

  .dsa-view-switcher {
    width: 100%;
    display: flex;
    justify-content: stretch;
  }

  .dsa-tab-pill {
    flex: 1;
    justify-content: center;
    padding: 0.45rem 0.65rem;
    font-size: 0.75rem;
  }

  /* Progress Dashboard Card */
  .dsa-hero-card {
    padding: 1.125rem 1rem;
    margin-bottom: 1.25rem;
  }

  .dsa-hero-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.875rem;
  }

  .dsa-hero-title-group {
    gap: 0.625rem;
  }

  .dsa-hero-icon {
    width: 38px;
    height: 38px;
    font-size: 20px;
  }

  .dsa-hero-stats-count {
    font-size: 1.35rem;
  }

  .dsa-hero-stats-label {
    font-size: 0.75rem;
  }

  .dsa-hero-pct-badge {
    padding: 0.3rem 0.65rem;
    font-size: 0.8125rem;
    gap: 0.25rem;
  }

  .dsa-progress-track {
    margin-bottom: 1rem;
    height: 8px;
  }

  /* 3-Column Difficulty Stats (Preserves horizontal grid instead of 3 giant rows) */
  .dsa-diff-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr)) !important;
    gap: 0.4rem !important;
  }

  .dsa-diff-card {
    padding: 0.55rem 0.45rem !important;
    gap: 0.35rem !important;
    border-radius: var(--radius-sm);
  }

  .dsa-diff-top {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 0.15rem !important;
  }

  .dsa-diff-label {
    font-size: 0.65rem !important;
    letter-spacing: 0.02em;
  }

  .dsa-diff-count {
    font-size: 0.75rem !important;
  }

  .dsa-diff-mini-track {
    height: 4px !important;
  }

  .pl-breakdown-chip {
    font-size: 0.6875rem !important;
    padding: 0.2rem 0.45rem !important;
  }

  /* Toolbar */
  .dsa-toolbar {
    padding: 0.875rem;
    gap: 0.65rem;
    margin-bottom: 1.25rem;
    overflow: hidden !important;
    min-width: 0 !important;
    max-width: 100% !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  .dsa-toolbar-top {
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
  }

  .dsa-search-wrap {
    max-width: 100% !important;
    width: 100% !important;
    min-width: 0 !important;
  }

  .dsa-search-kbd {
    display: none !important;
  }

  .dsa-search-wrap input.dsa-search-input {
    padding-right: 2.25rem !important;
    font-size: 0.8125rem !important;
  }

  .dsa-segmented-group {
    width: 100% !important;
    display: flex !important;
    overflow-x: auto !important;
    justify-content: space-between !important;
    margin-left: 0 !important;
    box-sizing: border-box !important;
  }

  .dsa-segment-btn {
    flex: 1 !important;
    text-align: center !important;
    padding: 0.35rem 0.35rem !important;
    font-size: 0.75rem !important;
  }

  .dsa-toolbar-actions {
    width: 100% !important;
    justify-content: flex-end !important;
  }

  .dsa-reset-btn {
    font-size: 0.75rem !important;
    padding: 0.3rem 0.65rem !important;
  }

  .dsa-toolbar-bottom {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 0.5rem !important;
    padding-top: 0.5rem !important;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
    overflow: hidden !important;
    box-sizing: border-box !important;
  }

  .dsa-quick-chips {
    display: flex !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
    flex-wrap: nowrap !important;
    gap: 0.35rem !important;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
    padding-bottom: 4px !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important;
    box-sizing: border-box !important;
  }

  .dsa-quick-chips::-webkit-scrollbar {
    display: none !important;
  }

  .dsa-search-counter {
    display: flex !important;
    justify-content: flex-end !important;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0 !important;
  }

  .dsa-results-badge {
    font-size: 0.6875rem;
    padding: 0.2rem 0.55rem;
  }

  /* Question Rows Responsive Design */
  .dsa-category-card {
    margin-bottom: 1.25rem;
    border-radius: var(--radius-md);
  }

  .dsa-category-header {
    padding: 0.875rem;
    gap: 0.625rem;
  }

  .dsa-category-index-badge {
    width: 30px;
    height: 30px;
    font-size: 0.8125rem;
  }

  .dsa-category-name {
    font-size: 1.05rem;
  }

  .dsa-category-desc {
    font-size: 0.75rem;
  }

  .dsa-category-meta-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
  }

  .dsa-pattern-group {
    padding: 0.875rem;
  }

  .dsa-pattern-title {
    font-size: 0.875rem;
  }

  .dsa-pattern-tip {
    font-size: 0.75rem;
  }

  .dsa-question-row {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 0.625rem !important;
    padding: 0.75rem 0.85rem !important;
    width: 100% !important;
    box-sizing: border-box !important;
  }

  .dsa-question-left {
    width: 100% !important;
    min-width: 0 !important;
    display: flex !important;
    align-items: flex-start !important;
    gap: 0.65rem !important;
  }

  .dsa-lc-num {
    min-width: 36px !important;
    padding: 0.15rem 0.35rem !important;
    font-size: 0.6875rem !important;
  }

  .dsa-question-title-wrap {
    flex-wrap: wrap !important;
    gap: 0.25rem !important;
  }

  .dsa-question-title {
    font-size: 0.875rem !important;
    white-space: normal !important;
    word-break: break-word !important;
    line-height: 1.35 !important;
  }

  .dsa-tag-ds,
  .dsa-tag-pattern {
    font-size: 0.6875rem !important;
    padding: 0.1rem 0.45rem !important;
  }

  .dsa-question-right {
    width: 100% !important;
    min-width: 0 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    flex-wrap: wrap !important;
    gap: 0.45rem !important;
    padding-top: 0.5rem !important;
    border-top: 1px solid var(--color-surface-container) !important;
  }

  .pl-eval-pill {
    font-size: 0.6875rem !important;
    padding: 0.2rem 0.5rem !important;
  }

  .dsa-badge-diff {
    font-size: 0.6875rem !important;
    padding: 0.2rem 0.5rem !important;
  }

  .dsa-btn-leetcode {
    font-size: 0.75rem !important;
    padding: 0.25rem 0.6rem !important;
  }
}

/* Mobile Small (< 480px) */
@media (max-width: 480px) {
  .dsa-nav-list,
  .dsa-nav-list.dsa-nav-slider {
    display: flex !important;
    flex-direction: row !important;
    overflow-x: auto !important;
    overflow-y: hidden !important;
    flex-wrap: nowrap !important;
    gap: 0.35rem !important;
    flex: 1 1 0% !important;
    min-width: 0 !important;
    scrollbar-width: none !important;
  }

  #main-content {
    padding: 0.75rem 0.5rem !important;
  }

  .dsa-hero-card {
    padding: 0.875rem 0.65rem !important;
  }

  .dsa-diff-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr)) !important;
    gap: 0.35rem !important;
  }

  .dsa-hero-stats-count {
    font-size: 1.25rem !important;
  }

  .dsa-category-header {
    padding: 0.75rem 0.65rem !important;
  }

  .dsa-pattern-group {
    padding: 0.75rem 0.65rem !important;
  }

  .dsa-nav-sidebar {
    padding: 0.5rem 0.5rem !important;
    max-height: none;
  }

  .dsa-nav-slider-wrapper {
    gap: 0.25rem !important;
  }

  .dsa-nav-arrow {
    width: 28px !important;
    height: 28px !important;
    min-width: 28px !important;
  }

  .dsa-nav-arrow .material-symbols-outlined {
    font-size: 16px !important;
  }

  .dsa-nav-item {
    font-size: 0.725rem !important;
    padding: 0.3rem 0.55rem !important;
  }
}

/* ==========================================================================
   10. Pattern Learning & Training Arena Styles
   ========================================================================== */

/* View Switcher Dual Pill Tabs */
.dsa-view-switcher {
  display: inline-flex;
  align-items: center;
  background: #f1f5f9;
  border: 1px solid #e2e8f0;
  padding: 0.25rem;
  border-radius: var(--radius-full);
  gap: 0.25rem;
}

.dsa-tab-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #64748b;
  border-radius: var(--radius-full);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.dsa-tab-pill:hover {
  color: #1e293b;
  background: rgba(255, 255, 255, 0.6);
}

.dsa-tab-pill.active {
  color: #4338ca;
  background: #ffffff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
}

.pl-tab-glow-badge {
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #ffffff;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.025em;
  box-shadow: 0 0 8px rgba(99, 102, 241, 0.4);
}

/* Hero Intro Section */
.pl-hero-intro {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.pl-flow-step {
  padding: 0.25rem 0.6rem;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  color: #475569;
}

.pl-flow-step.active {
  background: #eef2ff;
  border-color: #c7d2fe;
  color: #4338ca;
  font-weight: 700;
}

.pl-btn-arena-hero {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-lg);
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
  transition: all var(--transition-fast);
}

.pl-btn-arena-hero:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
}

/* 4 Summary Metrics Cards */
.pl-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.pl-stat-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  transition: transform var(--transition-fast);
}

.pl-stat-card:hover {
  transform: translateY(-2px);
}

.pl-stat-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  shrink: 0;
}

.pl-stat-number {
  font-size: 1.35rem;
  font-weight: 800;
  color: #0f172a;
  line-height: 1.2;
}

.pl-stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 0.025em;
  margin-top: 0.2rem;
}

/* Today's Recommended Pattern Card */
.pl-feature-row {
  display: grid;
  grid-template-columns: 1fr;
}

.pl-today-card {
  background: linear-gradient(135deg, #ffffff 0%, #fbfcfe 100%);
  border: 1px solid #e0e7ff;
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.08);
  position: relative;
  overflow: hidden;
}

.pl-today-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, #4f46e5, #8b5cf6);
}

.pl-today-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: #4338ca;
  background: #eef2ff;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
}

.pl-today-cat-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: #64748b;
  background: #f1f5f9;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-full);
}

.pl-today-title {
  font-size: 1.375rem;
  font-weight: 800;
  color: #0f172a;
  margin-top: 0.5rem;
  margin-bottom: 0.35rem;
}

.pl-today-oneliner {
  font-size: 0.875rem;
  color: #475569;
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.pl-tag-signal {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: #334155;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-md);
}

/* Weak Patterns Notice Section */
.pl-weak-section {
  background: #fffbeb;
  border: 1px solid #fef3c7;
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
}

.pl-weak-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: #ffffff;
  border: 1px solid #fde68a;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: #92400e;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pl-weak-chip:hover {
  background: #fef3c7;
  border-color: #f59e0b;
}

/* Catalog Toolbar & Category Chips */
.pl-catalog-toolbar {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-xl);
  padding: 1.25rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.pl-category-chips-track {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.pl-category-chip {
  white-space: nowrap;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-full);
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  color: #64748b;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pl-category-chip:hover {
  background: #f1f5f9;
  color: #1e293b;
}

.pl-category-chip.active {
  background: #4f46e5;
  border-color: #4f46e5;
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(79, 70, 229, 0.25);
}

/* Pattern Cards Grid */
.pl-pattern-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.pl-pattern-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-xl);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: all var(--transition-fast);
}

.pl-pattern-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  border-color: #c7d2fe;
}

.pl-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.pl-cat-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #64748b;
  background: #f8fafc;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.25rem;
}

.pl-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #0f172a;
}

.pl-mastery-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.025em;
  white-space: nowrap;
}

.mastery-not-started {
  background: #f1f5f9;
  color: #64748b;
}

.mastery-learning {
  background: #eff6ff;
  color: #2563eb;
  border: 1px solid #bfdbfe;
}

.mastery-practicing {
  background: #f5f3ff;
  color: #7c3aed;
  border: 1px solid #ddd6fe;
}

.mastery-mastered {
  background: #ecfdf5;
  color: #059669;
  border: 1px solid #a7f3d0;
}

.mastery-weak {
  background: #fffbeb;
  color: #d97706;
  border: 1px solid #fde68a;
}

.pl-card-oneliner {
  font-size: 0.8125rem;
  color: #475569;
  line-height: 1.45;
  margin-bottom: 0.875rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.pl-card-meta-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.875rem;
}

.pl-pill-complexity, .pl-pill-qcount {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.6875rem;
  font-weight: 600;
  color: #475569;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-md);
}

.pl-signals-preview {
  margin-bottom: 1rem;
}

.pl-signals-label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 600;
  color: #94a3b8;
  margin-bottom: 0.3rem;
}

.pl-signals-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.pl-signal-chip {
  font-size: 0.6875rem;
  color: #334155;
  background: #f1f5f9;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
}

.pl-card-footer {
  margin-top: auto;
  padding-top: 0.875rem;
  border-top: 1px solid #f1f5f9;
}

.pl-progress-mini-bar {
  height: 4px;
  background: #e2e8f0;
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.pl-progress-mini-fill {
  height: 100%;
  background: #4f46e5;
  border-radius: var(--radius-full);
  transition: width var(--transition-normal);
}

.pl-footer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.pl-solved-ratio {
  font-size: 0.75rem;
  font-weight: 600;
  color: #64748b;
}

.pl-btn-study {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: #4f46e5;
  background: #eef2ff;
  border: 1px solid #e0e7ff;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pl-btn-study:hover {
  background: #4f46e5;
  color: #ffffff;
  border-color: #4f46e5;
}

/* Dedicated Pattern Study View */
.pl-study-view-section {
  max-width: 1000px;
  margin: 0 auto;
}

.pl-btn-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #475569;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pl-btn-back:hover {
  background: #f8fafc;
  color: #1e293b;
  border-color: #cbd5e1;
}

.pl-study-hero {
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
  color: #ffffff;
  border-radius: var(--radius-xl);
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 20px rgba(49, 46, 129, 0.25);
}

.pl-study-cat-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: #c7d2fe;
  background: rgba(255, 255, 255, 0.1);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.5rem;
}

.pl-study-title {
  font-size: 1.875rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.pl-study-oneliner {
  font-size: 0.9375rem;
  color: #e0e7ff;
  margin-top: 0.5rem;
  line-height: 1.5;
  max-width: 600px;
}

.pl-study-mastery-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  backdrop-filter: blur(8px);
}

.pl-study-mastery-label {
  font-size: 0.6875rem;
  font-weight: 600;
  color: #c7d2fe;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

/* Anchor Navigation Bar */
.pl-study-anchor-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  overflow-x: auto;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
  position: sticky;
  top: 1rem;
  z-index: 20;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
  scroll-behavior: smooth;
}

.pl-anchor-link {
  white-space: nowrap;
  font-size: 0.75rem;
  font-weight: 600;
  color: #64748b;
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  user-select: none;
}

.pl-anchor-link:hover, .pl-anchor-link.active {
  color: #4f46e5;
  background: #eef2ff;
}

/* Study Card Sections */
.pl-study-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
  scroll-margin-top: 5rem;
}

.pl-study-section-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: #0f172a;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}

.pl-prose-text {
  font-size: 0.875rem;
  color: #334155;
  line-height: 1.65;
}

.pl-alert-box {
  display: flex;
  gap: 0.875rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid;
}

.pl-alert-info {
  background: #f8fafc;
  border-color: #e2e8f0;
  color: #1e293b;
}

.pl-signals-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.pl-signal-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
}

.pl-mental-model-box {
  display: flex;
  gap: 1rem;
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.pl-variations-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.pl-variation-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.pl-var-badge {
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #4f46e5;
  background: #e0e7ff;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
}

.pl-var-title {
  font-size: 0.875rem;
  font-weight: 700;
  color: #0f172a;
  margin-top: 0.35rem;
  margin-bottom: 0.35rem;
}

.pl-var-desc {
  font-size: 0.75rem;
  color: #475569;
  line-height: 1.5;
}

.pl-complexity-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.pl-comp-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  text-align: center;
}

.pl-comp-label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 600;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.pl-comp-val {
  font-family: monospace;
  font-size: 1.5rem;
  font-weight: 800;
}

.pl-comp-note {
  display: block;
  font-size: 0.75rem;
  color: #64748b;
  margin-top: 0.25rem;
}

.pl-pitfalls-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
}

.pl-pitfall-item {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  background: #fef2f2;
  border: 1px solid #fee2e2;
  border-radius: var(--radius-md);
  padding: 0.65rem 0.875rem;
}

/* C++ Code Block Container */
.pl-code-block-container {
  background: #0f172a;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid #1e293b;
}

.pl-code-pre {
  margin: 0;
  padding: 1.25rem;
  font-family: 'JetBrains Mono', Consolas, Monaco, monospace;
  font-size: 0.8125rem;
  color: #e2e8f0;
  line-height: 1.6;
  overflow-x: auto;
}

.pl-btn-copy-code {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: #475569;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pl-btn-copy-code:hover {
  background: #eef2ff;
  color: #4338ca;
  border-color: #c7d2fe;
}

/* Walkthrough Trace Steps */
.pl-trace-steps-container {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.pl-trace-step-item {
  display: flex;
  gap: 1rem;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 1rem;
}

.pl-trace-step-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: #4f46e5;
  background: #eef2ff;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-md);
  height: fit-content;
  white-space: nowrap;
}

/* Quizzes */
.pl-quiz-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.pl-quiz-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.pl-quiz-question-text {
  font-size: 0.875rem;
  color: #1e293b;
  line-height: 1.5;
  margin-bottom: 1rem;
}

.pl-quiz-options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.6rem;
}

.pl-quiz-opt-btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-md);
  padding: 0.65rem 0.875rem;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.pl-quiz-opt-btn:hover:not(:disabled) {
  border-color: #6366f1;
  background: #f5f3ff;
}

.pl-quiz-opt-btn.correct {
  background: #ecfdf5 !important;
  border-color: #10b981 !important;
  color: #065f46 !important;
}

.pl-quiz-opt-btn.wrong {
  background: #fef2f2 !important;
  border-color: #ef4444 !important;
  color: #991b1b !important;
}

.pl-opt-letter {
  font-size: 0.75rem;
  font-weight: 800;
  color: #64748b;
  background: #f1f5f9;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  shrink: 0;
}

.pl-opt-text {
  font-size: 0.8125rem;
  font-weight: 600;
}

.pl-quiz-feedback {
  margin-top: 1rem;
  padding: 0.875rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid;
}

.pl-quiz-feedback.is-correct {
  background: #f0fdf4;
  border-color: #bbf7d0;
}

.pl-quiz-feedback.is-wrong {
  background: #fef2f2;
  border-color: #fecaca;
}

/* Training Arena Modal & Drill UI */
.pl-arena-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid #e2e8f0;
  margin-bottom: 1.25rem;
}

.pl-arena-counter {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 700;
  color: #1e293b;
}

.pl-arena-score-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.8125rem;
  font-weight: 600;
}

.pl-arena-streak {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  color: #d97706;
}

.pl-arena-acc {
  color: #059669;
}

.pl-arena-question-box {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.pl-arena-qtitle {
  font-size: 1.15rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 0.4rem;
}

.pl-arena-qsnippet {
  font-size: 0.875rem;
  color: #334155;
  line-height: 1.55;
  margin-bottom: 0.75rem;
}

.pl-arena-constraints {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-family: monospace;
  color: #64748b;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-md);
}

.pl-arena-prompt {
  font-size: 0.8125rem;
  font-weight: 700;
  color: #475569;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.pl-arena-options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.pl-arena-opt-btn {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  background: #ffffff;
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 0.875rem 1rem;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition-fast);
}

.pl-arena-opt-btn:hover:not(:disabled) {
  border-color: #6366f1;
  background: #f5f3ff;
  transform: translateY(-1px);
}

.pl-arena-opt-btn.correct {
  background: #ecfdf5 !important;
  border-color: #10b981 !important;
}

.pl-arena-opt-btn.wrong {
  background: #fef2f2 !important;
  border-color: #ef4444 !important;
}

.pl-arena-opt-key {
  font-size: 0.8125rem;
  font-weight: 800;
  background: #f1f5f9;
  color: #475569;
  width: 26px;
  height: 26px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  shrink: 0;
}

.pl-arena-opt-name {
  font-size: 0.875rem;
  font-weight: 700;
  color: #0f172a;
}

.pl-arena-feedback-box {
  background: #f8fafc;
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  border: 1px solid;
  margin-top: 1rem;
}

.pl-arena-feedback-box.correct {
  background: #f0fdf4;
  border-color: #bbf7d0;
}

.pl-arena-feedback-box.wrong {
  background: #fef2f2;
  border-color: #fecaca;
}

.pl-arena-fb-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 800;
  margin-bottom: 0.4rem;
}

.pl-arena-fb-expl {
  font-size: 0.8125rem;
  color: #334155;
  line-height: 1.5;
  margin-bottom: 0.75rem;
}

.pl-arena-fb-hint {
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.7);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  color: #1e293b;
  margin-bottom: 1rem;
}

.pl-btn-arena-next {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 700;
  color: #ffffff;
  background: #4f46e5;
  border: none;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pl-btn-arena-next:hover {
  background: #4338ca;
}

/* Arena Summary */
.pl-arena-summary-card {
  text-align: center;
  padding: 1.5rem;
}

.pl-arena-summary-trophy {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  background: #fef3c7;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}

.pl-arena-summary-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.pl-summary-stat-box {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  padding: 1rem;
  display: flex;
  flex-direction: column;
}

/* Responsive Media Queries for Pattern Learning */
@media (max-width: 1024px) {
  .pl-pattern-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pl-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pl-variations-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .pl-pattern-cards-grid {
    grid-template-columns: 1fr;
  }
  .pl-stats-grid {
    grid-template-columns: 1fr;
  }
  .pl-study-hero {
    flex-direction: column;
    align-items: flex-start;
  }
  .pl-signals-grid {
    grid-template-columns: 1fr;
  }
  .pl-complexity-row {
    grid-template-columns: 1fr;
  }
  .pl-quiz-options-grid {
    grid-template-columns: 1fr;
  }
  .pl-arena-options-grid {
    grid-template-columns: 1fr;
  }
}

/* ================================================== */
/* Modal Dialog & Backdrop System                     */
/* ================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 9999;
  display: none !important;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-backdrop.open {
  display: flex !important;
}

.modal-backdrop.hidden,
.modal-backdrop:not(.open) {
  display: none !important;
  visibility: hidden !important;
  pointer-events: none !important;
}

.modal-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 680px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  border: 1px solid var(--color-outline-variant);
  overflow: hidden;
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.dsa-reset-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-md);
  color: var(--color-on-surface-variant);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.dsa-reset-btn:hover {
  background: #fef2f2;
  border-color: #fecaca;
  color: #dc2626;
  box-shadow: 0 1px 2px rgba(220, 38, 38, 0.08);
}

.dsa-modal-warning-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background: #fee2e2;
  color: #ef4444;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin: 0 auto 1.25rem;
  box-shadow: 0 0 0 8px #fef2f2;
}

/* ==========================================================================
   Pattern Learning Modals (Clean Light SaaS Theme matching Resume Modal)
   ========================================================================== */
.modal-card.pl-modal-card,
.pl-modal-card {
  background: #ffffff !important;
  border: 1px solid #e2e8f0 !important;
  border-radius: 1.25rem !important;
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.18), 0 0 1px rgba(15, 23, 42, 0.12) !important;
  color: #0f172a !important;
  position: relative !important;
  overflow: hidden !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  animation: plModalFadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes plModalFadeIn {
  from {
    opacity: 0;
    transform: scale(0.96) translateY(-8px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.pl-modal-card::before {
  display: none !important;
}

.pl-modal-title {
  font-family: 'Plus Jakarta Sans', system-ui, sans-serif !important;
  font-size: 1.125rem !important;
  font-weight: 700 !important;
  letter-spacing: -0.02em !important;
  color: #0f172a !important;
}

.pl-modal-subtitle {
  font-family: 'Inter', system-ui, sans-serif !important;
  color: #64748b !important;
  line-height: 1.55 !important;
  font-size: 0.8125rem !important;
}

.pl-modal-lcnum {
  font-family: var(--font-mono, monospace) !important;
  color: #4f46e5 !important;
  background: #eef2ff !important;
  border: 1px solid #e0e7ff !important;
  font-weight: 700 !important;
  letter-spacing: 0.04em !important;
  font-size: 0.6875rem !important;
  padding: 0.15rem 0.5rem !important;
  border-radius: 0.375rem !important;
  display: inline-block !important;
  margin-bottom: 0.25rem !important;
}

.pl-modal-close-btn {
  color: #64748b !important;
  background: #ffffff !important;
  border: 1px solid #e2e8f0 !important;
  border-radius: 0.625rem !important;
  padding: 0.35rem !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  transition: all 0.15s ease !important;
  cursor: pointer !important;
}

.pl-modal-close-btn:hover {
  color: #0f172a !important;
  background: #f8fafc !important;
  border-color: #cbd5e1 !important;
}

/* Question Solve Honesty Evaluation Options */
.pl-solve-opt-btn {
  display: flex !important;
  align-items: center !important;
  gap: 0.875rem !important;
  width: 100% !important;
  padding: 0.875rem 1rem !important;
  background: #ffffff !important;
  border: 1.5px solid #e2e8f0 !important;
  border-radius: 0.875rem !important;
  text-align: left !important;
  cursor: pointer !important;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1) !important;
  position: relative !important;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.03) !important;
}

.pl-solve-opt-btn:hover {
  background: #fafafa !important;
  border-color: #6366f1 !important;
  transform: translateY(-1px) !important;
  box-shadow: 0 6px 18px -3px rgba(99, 102, 241, 0.12), 0 2px 4px -2px rgba(99, 102, 241, 0.08) !important;
}

.pl-solve-opt-btn:active {
  transform: translateY(0) !important;
}

.pl-solve-opt-title {
  font-family: 'Plus Jakarta Sans', system-ui, sans-serif !important;
  font-size: 0.875rem !important;
  font-weight: 700 !important;
  color: #0f172a !important;
  display: block !important;
}

.pl-solve-opt-desc {
  font-family: 'Inter', system-ui, sans-serif !important;
  font-size: 0.75rem !important;
  color: #64748b !important;
  margin-top: 0.2rem !important;
  line-height: 1.45 !important;
}

.pl-solve-opt-badge {
  font-family: 'Plus Jakarta Sans', system-ui, sans-serif !important;
  font-size: 0.6875rem !important;
  font-weight: 700 !important;
  letter-spacing: 0.02em !important;
  padding: 0.2rem 0.6rem !important;
  border-radius: 9999px !important;
  flex-shrink: 0 !important;
}

.pl-badge-self {
  background: #ecfdf5 !important;
  color: #059669 !important;
  border: 1px solid #a7f3d0 !important;
}

.pl-badge-help30 {
  background: #fffbeb !important;
  color: #d97706 !important;
  border: 1px solid #fde68a !important;
}

.pl-badge-help50 {
  background: #fff7ed !important;
  color: #ea580c !important;
  border: 1px solid #fed7aa !important;
}

.pl-badge-cross {
  background: #fef2f2 !important;
  color: #e11d48 !important;
  border: 1px solid #fecdd3 !important;
}

.pl-solve-opt-icon {
  width: 42px !important;
  height: 42px !important;
  border-radius: 0.65rem !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  flex-shrink: 0 !important;
  transition: transform 0.2s ease !important;
}

.pl-solve-opt-btn:hover .pl-solve-opt-icon {
  transform: scale(1.06);
}

.pl-icon-self {
  background: #ecfdf5 !important;
  color: #059669 !important;
  border: 1px solid #a7f3d0 !important;
}

.pl-icon-help30 {
  background: #fffbeb !important;
  color: #d97706 !important;
  border: 1px solid #fde68a !important;
}

.pl-icon-help50 {
  background: #fff7ed !important;
  color: #ea580c !important;
  border: 1px solid #fed7aa !important;
}

.pl-icon-cross {
  background: #fef2f2 !important;
  color: #e11d48 !important;
  border: 1px solid #fecdd3 !important;
}

/* Modal Footer & Action Buttons */
#pl-solve-modal-clear {
  color: #64748b !important;
  font-family: 'Inter', system-ui, sans-serif !important;
  font-size: 0.75rem !important;
  font-weight: 600 !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: 0.35rem !important;
  transition: color 0.15s ease !important;
  cursor: pointer !important;
}

#pl-solve-modal-clear:hover {
  color: #ef4444 !important;
}

.pl-btn-modal-cancel {
  background: #ffffff !important;
  border: 1px solid #cbd5e1 !important;
  color: #334155 !important;
  font-family: 'Inter', system-ui, sans-serif !important;
  font-size: 0.75rem !important;
  font-weight: 600 !important;
  padding: 0.45rem 1.15rem !important;
  border-radius: 0.5rem !important;
  transition: all 0.15s ease !important;
  cursor: pointer !important;
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05) !important;
}

.pl-btn-modal-cancel:hover {
  background: #f8fafc !important;
  border-color: #94a3b8 !important;
  color: #0f172a !important;
}

.pl-modal-card .btn-primary {
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%) !important;
  color: #ffffff !important;
  border: none !important;
  box-shadow: 0 4px 14px 0 rgba(99, 102, 241, 0.35) !important;
  border-radius: 0.5rem !important;
  font-family: 'Plus Jakarta Sans', system-ui, sans-serif !important;
  font-weight: 600 !important;
  transition: all 0.15s ease !important;
}

.pl-modal-card .btn-primary:hover {
  background: linear-gradient(135deg, #4f46e5 0%, #4338ca 100%) !important;
  box-shadow: 0 6px 20px 0 rgba(99, 102, 241, 0.55) !important;
  transform: translateY(-1px) !important;
}

.pl-modal-card .btn-secondary {
  background: #ffffff !important;
  border: 1px solid #cbd5e1 !important;
  color: #334155 !important;
  border-radius: 0.5rem !important;
  font-family: 'Plus Jakarta Sans', system-ui, sans-serif !important;
  font-weight: 600 !important;
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05) !important;
  transition: all 0.15s ease !important;
}

.pl-modal-card .btn-secondary:hover {
  background: #f8fafc !important;
  border-color: #94a3b8 !important;
  color: #0f172a !important;
}

/* Responsive adjustments for Pattern Learning & Solve Honesty Modals */
@media (max-width: 640px) {
  .modal-backdrop {
    padding: 0.75rem !important;
  }

  .modal-card.pl-modal-card,
  .pl-modal-card {
    max-width: min(94vw, 440px) !important;
    padding: 1.125rem 1rem !important;
    border-radius: 1rem !important;
    margin: 0 auto !important;
  }

  .pl-modal-title {
    font-size: 1rem !important;
  }

  .pl-modal-subtitle {
    font-size: 0.75rem !important;
    margin-bottom: 0.875rem !important;
  }

  .pl-solve-opt-btn {
    padding: 0.65rem 0.75rem !important;
    gap: 0.65rem !important;
    border-radius: 0.75rem !important;
  }

  .pl-solve-opt-icon {
    width: 36px !important;
    height: 36px !important;
    border-radius: 0.5rem !important;
  }

  .pl-solve-opt-icon svg {
    font-size: 16px !important;
  }

  .pl-solve-opt-header {
    flex-wrap: wrap !important;
    gap: 0.25rem !important;
  }

  .pl-solve-opt-title {
    font-size: 0.8125rem !important;
  }

  .pl-solve-opt-badge {
    font-size: 0.625rem !important;
    padding: 0.12rem 0.45rem !important;
  }

  .pl-solve-opt-desc {
    font-size: 0.6875rem !important;
    line-height: 1.35 !important;
  }

  #pl-solve-modal-clear {
    font-size: 0.6875rem !important;
  }

  .pl-btn-modal-cancel {
    font-size: 0.6875rem !important;
    padding: 0.35rem 0.85rem !important;
  }
}

/* Question Row Evaluation Pill */
.pl-eval-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.65rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.pl-eval-pill-unattempted {
  background: #f1f5f9;
  border-color: #e2e8f0;
  color: #64748b;
}

.pl-eval-pill-unattempted:hover {
  background: #e2e8f0;
  color: #334155;
  border-color: #cbd5e1;
}

.dark .pl-eval-pill-unattempted {
  background: #1e293b;
  border-color: #334155;
  color: #94a3b8;
}

.dark .pl-eval-pill-unattempted:hover {
  background: #334155;
  color: #f1f5f9;
}

.pl-eval-pill-self {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.3);
  color: #059669;
}

.pl-eval-pill-self:hover {
  background: rgba(16, 185, 129, 0.18);
}

.pl-eval-pill-help,
.pl-eval-pill-help30 {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.3);
  color: #d97706;
}

.pl-eval-pill-help:hover,
.pl-eval-pill-help30:hover {
  background: rgba(245, 158, 11, 0.18);
}

.pl-eval-pill-help50 {
  background: rgba(249, 115, 22, 0.1);
  border-color: rgba(249, 115, 22, 0.3);
  color: #ea580c;
}

.pl-eval-pill-help50:hover {
  background: rgba(249, 115, 22, 0.18);
}

.pl-eval-pill-cross {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  color: #dc2626;
}

.pl-eval-pill-cross:hover {
  background: rgba(239, 68, 68, 0.18);
}

/* Locked Sequential Question Rows */
.dsa-question-row.is-locked {
  opacity: 0.65;
  background: #f8fafc;
  border-color: #e2e8f0;
  border-style: dashed;
  cursor: pointer;
  position: relative;
  transition: all 0.2s ease;
}

.dsa-question-row.is-locked:hover {
  opacity: 0.85;
  background: #f1f5f9;
  border-color: #cbd5e1;
  transform: none;
  box-shadow: none;
}

.dark .dsa-question-row.is-locked {
  opacity: 0.55;
  background: rgba(15, 23, 42, 0.4);
  border-color: #334155;
}

.dark .dsa-question-row.is-locked:hover {
  opacity: 0.75;
  background: rgba(30, 41, 59, 0.5);
  border-color: #475569;
}

.dsa-checkbox-custom.dsa-checkbox-locked {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #94a3b8;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dark .dsa-checkbox-custom.dsa-checkbox-locked {
  background: #1e293b;
  border-color: #334155;
  color: #64748b;
}

/* Pattern Learning Question Row Evaluation Boxes (Matching Modal Icons) */
.dsa-checkbox-custom.pl-eval-box::after,
.pl-eval-box::after {
  display: none !important;
  content: none !important;
}

.pl-eval-box {
  width: 24px !important;
  height: 24px !important;
  border-radius: 7px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  flex-shrink: 0 !important;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1) !important;
  box-sizing: border-box !important;
  position: relative !important;
}

/* Empty / Unattempted */
.pl-eval-box.pl-eval-box-empty {
  background: #ffffff !important;
  border: 2px solid #cbd5e1 !important;
  color: transparent !important;
}

.pl-eval-box.pl-eval-box-empty:hover {
  border-color: #6366f1 !important;
  background: #eef2ff !important;
}

.dark .pl-eval-box.pl-eval-box-empty {
  background: #1e293b !important;
  border-color: #475569 !important;
}

.dark .pl-eval-box.pl-eval-box-empty:hover {
  border-color: #818cf8 !important;
  background: #273549 !important;
}

/* 100% Solved on my own -> verified (Emerald) */
.pl-eval-box.pl-eval-box-self {
  background: #10b981 !important;
  border: 1.5px solid #059669 !important;
  color: #ffffff !important;
  box-shadow: 0 2px 6px -1px rgba(16, 185, 129, 0.35) !important;
}

.pl-eval-box.pl-eval-box-self:hover {
  background: #059669 !important;
  box-shadow: 0 4px 10px -1px rgba(16, 185, 129, 0.5) !important;
  transform: scale(1.06);
}

/* ~30% Help from AI / Hints -> psychology (Amber) */
.pl-eval-box.pl-eval-box-help30 {
  background: #f59e0b !important;
  border: 1.5px solid #d97706 !important;
  color: #ffffff !important;
  box-shadow: 0 2px 6px -1px rgba(245, 158, 11, 0.35) !important;
}

.pl-eval-box.pl-eval-box-help30:hover {
  background: #d97706 !important;
  box-shadow: 0 4px 10px -1px rgba(245, 158, 11, 0.5) !important;
  transform: scale(1.06);
}

/* ~50% Help from AI / Editorial -> smart_toy (Orange) */
.pl-eval-box.pl-eval-box-help50 {
  background: #f97316 !important;
  border: 1.5px solid #ea580c !important;
  color: #ffffff !important;
  box-shadow: 0 2px 6px -1px rgba(249, 115, 22, 0.35) !important;
}

.pl-eval-box.pl-eval-box-help50:hover {
  background: #ea580c !important;
  box-shadow: 0 4px 10px -1px rgba(249, 115, 22, 0.5) !important;
  transform: scale(1.06);
}

/* Copy / Paste / Direct Solution -> content_paste_off (Rose / Red) */
.pl-eval-box.pl-eval-box-cross {
  background: #ef4444 !important;
  border: 1.5px solid #dc2626 !important;
  color: #ffffff !important;
  box-shadow: 0 2px 6px -1px rgba(239, 68, 68, 0.35) !important;
}

.pl-eval-box.pl-eval-box-cross:hover {
  background: #dc2626 !important;
  box-shadow: 0 4px 10px -1px rgba(239, 68, 68, 0.5) !important;
  transform: scale(1.06);
}

/* Locked Question Box */
.pl-eval-box.pl-eval-box-locked {
  background: #f1f5f9 !important;
  border: 1.5px dashed #cbd5e1 !important;
  color: #94a3b8 !important;
  cursor: pointer !important;
}

.dark .pl-eval-box.pl-eval-box-locked {
  background: #1e293b !important;
  border-color: #334155 !important;
  color: #64748b !important;
}

.pl-eval-box.pl-eval-box-locked:hover {
  border-color: #94a3b8 !important;
  background: #e2e8f0 !important;
}

.pl-seq-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6875rem;
  font-weight: 700;
  font-family: var(--font-mono, monospace);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  background: rgba(99, 102, 241, 0.08);
  color: #6366f1;
  border: 1px solid rgba(99, 102, 241, 0.2);
  flex-shrink: 0;
}

.dark .pl-seq-badge {
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border-color: rgba(99, 102, 241, 0.3);
}

.pl-seq-badge-locked {
  background: #f1f5f9;
  color: #94a3b8;
  border-color: #e2e8f0;
}

.dark .pl-seq-badge-locked {
  background: #1e293b;
  color: #64748b;
  border-color: #334155;
}

.pl-locked-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.65rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: #f1f5f9;
  color: #94a3b8;
  border: 1px dashed #cbd5e1;
  cursor: pointer;
}

.dark .pl-locked-pill {
  background: #1e293b;
  color: #64748b;
  border-color: #334155;
}

.pl-locked-btn {
  pointer-events: none;
  opacity: 0.4;
  cursor: not-allowed !important;
}

@keyframes plPulseRow {
  0% {
    box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.6);
    border-color: #6366f1;
  }
  70% {
    box-shadow: 0 0 0 8px rgba(99, 102, 241, 0);
    border-color: #818cf8;
  }
  100% {
    box-shadow: 0 0 0 0 rgba(99, 102, 241, 0);
  }
}

.pl-row-highlight {
  animation: plPulseRow 1.2s ease-in-out 2;
}

.pl-breakdown-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.55rem;
  border-radius: 9999px;
  font-size: 0.7rem;
  font-weight: 600;
}

.pl-breakdown-chip.is-interactive {
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.pl-breakdown-chip.is-interactive:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
}

.pl-breakdown-chip.is-active {
  box-shadow: 0 0 0 2px #ffffff, 0 0 0 4px currentColor;
  font-weight: 700;
}

.pl-weak-alert-banner {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  background: #fffbeb;
  border: 1px solid #fef3c7;
  color: #92400e;
  font-size: 0.8125rem;
  margin-bottom: 1rem;
}

.dark .pl-weak-alert-banner {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.2);
  color: #fcd34d;
}

/* ==========================================================================
   11. Floating Jump-to-Section Up Button
   ========================================================================== */
.dsa-scroll-up-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.38), 0 2px 6px rgba(0, 0, 0, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 45;
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px) scale(0.9);
  transition: opacity 0.25s ease, transform 0.25s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.dsa-scroll-up-btn.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

/* Remove floating jump arrow in Pattern Learning view only */
#dsa-pattern-learning-view:not(.hidden) ~ #dsa-scroll-to-section-btn,
#dsa-roadmap-view.hidden ~ #dsa-scroll-to-section-btn,
body:has(#dsa-pattern-learning-view:not(.hidden)) #dsa-scroll-to-section-btn,
body:has(#dsa-roadmap-view.hidden) #dsa-scroll-to-section-btn {
  display: none !important;
  opacity: 0 !important;
  visibility: hidden !important;
  pointer-events: none !important;
}

.dsa-scroll-up-btn:hover {
  background: linear-gradient(135deg, #4338ca 0%, #4f46e5 100%);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.48), 0 2px 6px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px) scale(1.05);
}

.dsa-scroll-up-btn:active {
  transform: translateY(0) scale(0.95);
}

.dsa-scroll-up-btn .material-symbols-outlined {
  font-size: 22px;
  font-weight: 700;
  transition: transform var(--transition-fast);
}

.dsa-scroll-up-btn:hover .material-symbols-outlined {
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .dsa-scroll-up-btn {
    bottom: 1.25rem;
    right: 1.25rem;
    width: 40px;
    height: 40px;
  }

  .dsa-scroll-up-btn .material-symbols-outlined {
    font-size: 20px;
  }
}