:root {
  --font-family: 'Cairo', system-ui, -apple-system, sans-serif;
  --bg-primary: #090D16;
  --bg-surface: #131D31;
  --bg-surface-elevated: #1A2640;
  --bg-input: #0D1525;
  --border-color: #24324D;
  --border-focus: #0D9488;
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --color-teal: #0D9488;
  --color-teal-glow: rgba(13, 148, 136, 0.25);
  --color-blue: #0284C7;
  --color-purple: #8B5CF6;
  --color-amber: #F59E0B;
  --color-emerald: #10B981;
  --color-rose: #F43F5E;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.35);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
}

body.light-theme {
  --bg-primary: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #F1F5F9;
  --bg-input: #FFFFFF;
  --border-color: #E2E8F0;
  --border-focus: #0D9488;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --shadow-card: 0 4px 16px rgba(100, 116, 139, 0.08);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* TOP NAV */
.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 28px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-teal), var(--color-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 20px;
  box-shadow: 0 0 16px var(--color-teal-glow);
}

.brand-title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.3px;
}

.brand-title span {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--color-teal);
  background: var(--color-teal-glow);
  padding: 2px 8px;
  border-radius: 6px;
  margin-right: 6px;
}

.brand-subtitle {
  font-size: 11.5px;
  color: var(--text-secondary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.status-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 30px;
  font-size: 12px;
  font-weight: 600;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
}

.status-pill.online .status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-emerald);
  box-shadow: 0 0 8px var(--color-emerald);
}

/* APP LAYOUT */
.app-layout {
  display: flex;
  flex: 1;
}

.sidebar {
  width: 270px;
  background-color: var(--bg-surface);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 16px 10px;
}

.nav-menu {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-family);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.18s ease;
  text-align: right;
}

.nav-item:hover {
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
}

.nav-item.active {
  background: linear-gradient(90deg, rgba(13, 148, 136, 0.18), transparent);
  color: var(--color-teal);
  border-right: 3px solid var(--color-teal);
}

.sidebar-footer {
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}

.db-stats-compact {
  background-color: var(--bg-input);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-size: 11.5px;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  padding: 2.5px 0;
  color: var(--text-secondary);
}

.stat-row strong {
  color: var(--color-teal);
}

/* MAIN CONTENT */
.main-content {
  flex: 1;
  padding: 26px;
  overflow-y: auto;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.2s ease;
}

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

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.panel-title {
  font-size: 19px;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 10px;
}

.panel-desc {
  font-size: 12.5px;
  color: var(--text-secondary);
  margin-top: 3px;
}

.panel-header-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

/* CARDS */
.card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.card-header h3 {
  font-size: 14.5px;
  font-weight: 700;
}

.info-card {
  background: linear-gradient(135deg, rgba(13, 148, 136, 0.08), rgba(2, 132, 199, 0.05));
  border-color: rgba(13, 148, 136, 0.25);
  margin-bottom: 18px;
}

.info-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-teal);
  font-size: 13px;
  margin-bottom: 8px;
}

.columns-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.col-badge {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-family: monospace;
  direction: ltr;
}

.col-badge.required {
  border-color: var(--color-teal);
  color: var(--color-teal);
  font-weight: bold;
}

/* DROP ZONE */
.drop-zone-card {
  border: 2px dashed var(--border-color);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 20px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.drop-zone-card:hover, .drop-zone-card.drag-over {
  border-color: var(--color-teal);
  background-color: rgba(13, 148, 136, 0.04);
}

.drop-icon {
  font-size: 38px;
  color: var(--color-teal);
  margin-bottom: 10px;
}

.drop-zone-card h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.drop-zone-card p {
  font-size: 11.5px;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.file-info-pill {
  margin-top: 12px;
  background-color: var(--color-teal-glow);
  color: var(--color-teal);
  border: 1px solid var(--color-teal);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 11.5px;
  font-weight: 600;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 16px;
  border-radius: var(--radius-md);
  border: none;
  font-family: var(--font-family);
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.16s ease;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, #14B8A6, #0D9488);
  color: white;
  box-shadow: 0 4px 14px var(--color-teal-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px var(--color-teal-glow);
}

.btn-secondary {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--border-color);
}

.btn-success {
  background: linear-gradient(135deg, #10B981, #059669);
  color: white;
}

.btn-danger {
  background-color: rgba(244, 63, 94, 0.15);
  border: 1px solid var(--color-rose);
  color: var(--color-rose);
}

.btn-lg {
  padding: 11px 22px;
  font-size: 14px;
}

.btn-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.btn-icon:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
}

.btn-small {
  padding: 5px 11px;
  font-size: 11.5px;
  border-radius: 6px;
  cursor: pointer;
}

/* GRIDS & FORMS */
.grid {
  display: grid;
  gap: 14px;
}

.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.grid-4 { grid-template-columns: 1fr 1fr 1fr 1fr; }

.form-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 10px;
}

.form-group label {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--text-secondary);
}

.form-control {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 12.5px;
  outline: none;
  transition: border-color 0.2s ease;
}

.form-control:focus {
  border-color: var(--color-teal);
}

.code-textarea {
  width: 100%;
  height: 160px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px;
  color: var(--text-primary);
  font-family: monospace;
  font-size: 11.5px;
  line-height: 1.5;
  resize: vertical;
  direction: ltr;
}

.code-box {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  padding: 12px;
  border-radius: var(--radius-sm);
  font-family: monospace;
  direction: ltr;
  color: var(--color-teal);
  font-size: 12px;
}

.actions-bar {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* TABLES */
.table-responsive {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.data-table th {
  background-color: var(--bg-surface-elevated);
  padding: 10px 12px;
  text-align: right;
  font-weight: 700;
  color: var(--text-secondary);
  border-bottom: 2px solid var(--border-color);
}

.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.data-table tr:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

/* PILLS & BADGES */
.pill {
  padding: 2.5px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.pill-success { background-color: rgba(16, 185, 129, 0.16); color: var(--color-emerald); }
.pill-teal { background-color: var(--color-teal-glow); color: var(--color-teal); }
.pill-purple { background-color: rgba(139, 92, 246, 0.16); color: var(--color-purple); }
.pill-amber { background-color: rgba(245, 158, 11, 0.16); color: var(--color-amber); }
.pill-rose { background-color: rgba(244, 63, 94, 0.16); color: var(--color-rose); }
.pill-blue { background-color: rgba(2, 132, 199, 0.16); color: var(--color-blue); }

.pill-free { background-color: rgba(16, 185, 129, 0.15); color: var(--color-emerald); border: 1px solid rgba(16, 185, 129, 0.3); }
.pill-pro { background-color: rgba(139, 92, 246, 0.15); color: var(--color-purple); border: 1px solid rgba(139, 92, 246, 0.3); }

/* TOASTS */
.toast-container {
  position: fixed;
  bottom: 20px;
  left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 9999;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
  animation: slideIn 0.25s ease;
  font-size: 12.5px;
  font-weight: 700;
}

.toast.success { border-color: var(--color-emerald); color: var(--color-emerald); }
.toast.error { border-color: var(--color-rose); color: var(--color-rose); }

@keyframes slideIn {
  from { transform: translateX(-30px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* MODALS */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
  backdrop-filter: blur(4px);
}

.modal-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 620px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0,0,0,0.65);
}

.modal-lg { max-width: 820px; }
.modal-xl { max-width: 960px; }

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  font-size: 15px;
  font-weight: 700;
}

.modal-body {
  padding: 18px;
  overflow-y: auto;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 18px;
  border-top: 1px solid var(--border-color);
}

/* TRACK STEPS BUILDER STYLES (NEW) */
.track-step-card {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: all 0.15s ease;
}

.track-step-card:hover {
  border-color: var(--color-teal);
}

.step-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.step-index-badge {
  background-color: var(--color-teal);
  color: white;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 12px;
  margin-left: 8px;
}

.step-type-pill {
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 700;
}

.step-actions {
  display: flex;
  gap: 4px;
}

.step-fields-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 8px;
}

.step-custom-box {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  padding: 10px;
  border-radius: var(--radius-sm);
  margin-top: 6px;
}

/* SUBJECTS HIERARCHY ACCORDION (NEW) */
.subject-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 18px;
  margin-bottom: 14px;
}

.subject-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.subject-title-area {
  display: flex;
  align-items: center;
  gap: 10px;
}

.subject-color-tag {
  width: 12px;
  height: 38px;
  border-radius: 4px;
}

.topics-tags-container {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.topic-chip {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.topic-chip:hover {
  border-color: var(--color-teal);
}

.text-teal { color: var(--color-teal); }
.text-rose { color: var(--color-rose); }
.text-blue { color: var(--color-blue); }
.text-purple { color: var(--color-purple); }
.text-amber { color: var(--color-amber); }
.text-emerald { color: var(--color-emerald); }
.text-center { text-align: center; }

/* SIDEBAR SECTION HEADERS */
.nav-section-header {
  font-size: 11px;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 10px 14px 4px 14px;
  margin-top: 6px;
}

/* FREE & PAID PILLS */
.badge-free {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 700;
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-paid {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 700;
  background: rgba(245, 158, 11, 0.15);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* 3-PILLAR ACCORDION & CONTAINER CARDS */
.course-card, .folder-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 18px;
  margin-bottom: 18px;
  transition: border-color 0.2s ease;
}

.course-card:hover, .folder-card:hover {
  border-color: var(--border-focus);
}

.module-box {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  margin-top: 10px;
}

.lesson-row, .lecture-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  margin-top: 6px;
  font-size: 13px;
}

.lesson-row:hover, .lecture-row:hover {
  border-color: var(--color-teal);
}

.scope-checkbox-card {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 12.5px;
  transition: all 0.15s ease;
}

.scope-checkbox-card:hover {
  border-color: var(--color-teal);
}

.scope-checkbox-card input[type="checkbox"] {
  cursor: pointer;
  accent-color: var(--color-teal);
}