@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

:root {
  /* Theme: Dark Mode (Default) */
  --bg-space: #0b0f19;
  --bg-gradient: radial-gradient(circle at 50% 50%, #111827 0%, #030712 100%);
  --panel-glass: rgba(17, 24, 39, 0.55);
  --panel-border: rgba(255, 255, 255, 0.06);
  --input-glass: rgba(255, 255, 255, 0.03);
  --input-border: rgba(255, 255, 255, 0.08);
  
  --accent-primary: #6366f1; /* Indigo */
  --accent-secondary: #a855f7; /* Purple */
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  --accent-glow: rgba(99, 102, 241, 0.25);
  
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dark: #111827;
  
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.35);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --sidebar-width: 260px;
}

[data-theme="light"] {
  /* Theme: Light Mode */
  --bg-space: #f8fafc;
  --bg-gradient: radial-gradient(circle at 50% 50%, #f1f5f9 0%, #cbd5e1 100%);
  --panel-glass: rgba(255, 255, 255, 0.7);
  --panel-border: rgba(0, 0, 0, 0.08);
  --input-glass: rgba(0, 0, 0, 0.02);
  --input-border: rgba(0, 0, 0, 0.1);
  
  --accent-primary: #4f46e5;
  --accent-secondary: #9333ea;
  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #9333ea 100%);
  --accent-glow: rgba(79, 70, 229, 0.15);
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-dark: #f8fafc;
  
  --glass-shadow: 0 8px 32px 0 rgba(148, 163, 184, 0.15);
}

[data-theme="reading"] {
  /* Theme: Reading Mode (Warm Sepia) */
  --bg-space: #fbf0d9;
  --bg-gradient: radial-gradient(circle at 50% 50%, #fefcf7 0%, #f4ecd8 100%);
  --panel-glass: rgba(253, 251, 247, 0.95);
  --panel-border: rgba(45, 35, 21, 0.1);
  --input-glass: rgba(45, 35, 21, 0.03);
  --input-border: rgba(45, 35, 21, 0.15);
  
  --accent-primary: #855325;
  --accent-secondary: #a3703d;
  --accent-gradient: linear-gradient(135deg, #855325 0%, #a3703d 100%);
  --accent-glow: rgba(133, 83, 37, 0.1);
  
  --text-main: #2d2315;
  --text-muted: #6e5c4a;
  --text-dark: #fbf0d9;
  
  --glass-shadow: 0 8px 32px 0 rgba(45, 35, 21, 0.08);
}

.text-muted {
  color: var(--text-muted) !important;
}

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

body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: hidden;
  transition: var(--transition-smooth);
}

/* Scrollbar Styles */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.1);
}
::-webkit-scrollbar-thumb {
  background: var(--accent-primary);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-secondary);
}

/* Glassmorphism Classes */
.glass-panel {
  background: var(--panel-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--panel-border);
  box-shadow: var(--glass-shadow);
  border-radius: 16px;
  transition: var(--transition-smooth);
}

.glass-panel:hover {
  border-color: rgba(99, 102, 241, 0.2);
}

.glass-input {
  background: var(--input-glass);
  border: 1px solid var(--input-border);
  color: var(--text-main) !important;
  border-radius: 8px;
  padding: 10px 14px;
  transition: var(--transition-smooth);
}

.glass-input:focus {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--accent-primary);
  box-shadow: 0 0 10px var(--accent-glow);
  outline: none;
}

/* Buttons */
.btn-premium {
  background: var(--accent-gradient);
  color: #fff !important;
  border: none;
  font-weight: 600;
  border-radius: 8px;
  padding: 10px 20px;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-premium:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(168, 85, 247, 0.4);
}

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

.btn-glass {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  color: var(--text-main) !important;
  border-radius: 8px;
  font-weight: 500;
  transition: var(--transition-smooth);
}

.btn-glass:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-primary);
}

/* Landing Page Hero Header */
.hero-gradient {
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Navigation Layout */
#app-container {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  position: fixed;
  z-index: 100;
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
}

.main-content {
  margin-left: var(--sidebar-width);
  flex-grow: 1;
  padding: 24px;
  transition: var(--transition-smooth);
}

/* Sidebar Collapsed Sliding States */
#app-container.collapsed {
  --sidebar-width: 78px;
}

#app-container.collapsed .sidebar .brand-name,
#app-container.collapsed .sidebar-link span,
#app-container.collapsed .sidebar button span {
  display: none;
}

#app-container.collapsed .sidebar-link {
  justify-content: center;
  padding: 12px 0;
  margin: 4px 8px;
}

#app-container.collapsed .sidebar-link i {
  margin-right: 0;
}

#app-container.collapsed .sidebar .p-4 {
  padding: 1.5rem 0.5rem !important;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  justify-content: center;
}

#app-container.collapsed .sidebar .brand-text {
  justify-content: center;
}

#app-container.collapsed .sidebar .brand-text i {
  margin-right: 0 !important;
}

#app-container.collapsed #sidebar-collapse-btn {
  margin-top: 4px;
}

.sidebar .overflow-y-auto::-webkit-scrollbar {
  width: 4px;
}

.sidebar .overflow-y-auto::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar .overflow-y-auto::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
}

.sidebar .overflow-y-auto:hover::-webkit-scrollbar-thumb {
  background: rgba(99, 102, 241, 0.4);
}

@media (max-width: 991.98px) {
  .sidebar {
    margin-left: calc(-1 * var(--sidebar-width));
  }
  .sidebar.active {
    margin-left: 0;
  }
  .main-content {
    margin-left: 0;
  }
}

/* Active links in sidebar */
.sidebar-link {
  display: flex;
  align-items: center;
  padding: 12px 18px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 8px;
  margin: 4px 12px;
  font-weight: 500;
  transition: var(--transition-smooth);
}

.sidebar-link i {
  width: 20px;
  margin-right: 12px;
  font-size: 1.1rem;
}

.sidebar-link:hover, .sidebar-link.active {
  color: #fff !important;
  background: rgba(99, 102, 241, 0.15);
  border-left: 3px solid var(--accent-primary);
}

/* Kanban Board Column Styling */
.kanban-col {
  min-height: 500px;
  background: rgba(0, 0, 0, 0.15);
  border-radius: 12px;
  padding: 12px;
  border: 1px dashed var(--panel-border);
}

.kanban-card {
  cursor: grab;
  margin-bottom: 12px;
  padding: 14px;
  background: var(--panel-glass);
}

.kanban-card:active {
  cursor: grabbing;
}

/* Skeleton Loading Screens */
.skeleton {
  background: linear-gradient(90deg, rgba(255,255,255,0.03) 25%, rgba(255,255,255,0.08) 50%, rgba(255,255,255,0.03) 75%);
  background-size: 200% 100%;
  animation: loading-pulse 1.5s infinite;
  border-radius: 8px;
}

@keyframes loading-pulse {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Toast Container */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1050;
}

.glass-toast {
  background: rgba(17, 24, 39, 0.9);
  backdrop-filter: blur(8px);
  border: 1px solid var(--panel-border);
  color: #fff;
  border-radius: 8px;
  box-shadow: var(--glass-shadow);
  padding: 12px 20px;
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 250px;
  animation: slide-in-toast 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slide-in-toast {
  from { transform: translateY(50px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Dashboard XP/Streak Badge Floating styles */
.xp-badge {
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  color: #1e1b4b;
  font-weight: 700;
  border-radius: 30px;
  padding: 4px 12px;
  font-size: 0.85rem;
  box-shadow: 0 4px 10px rgba(245, 158, 11, 0.3);
}

.streak-badge {
  background: linear-gradient(135deg, #f43f5e 0%, #e11d48 100%);
  color: #fff;
  font-weight: 700;
  border-radius: 30px;
  padding: 4px 12px;
  font-size: 0.85rem;
  box-shadow: 0 4px 10px rgba(225, 29, 72, 0.3);
}

/* Interactive Readiness Score Gauge radial representation */
.readiness-ring {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto;
}

.readiness-value {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-secondary);
}

/* Pomodoro Timer Styling */
.timer-display {
  font-size: 3.5rem;
  font-weight: 800;
  font-family: monospace;
  letter-spacing: 2px;
  color: #fff;
}

/* Course catalog layout badges */
.course-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--accent-gradient);
  color: white;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  z-index: 10;
  box-shadow: 0 4px 10px rgba(99, 102, 241, 0.4);
}

/* Interactive Roadmap node hover animations */
.roadmap-node-card {
  transition: var(--transition-smooth);
}
.roadmap-node-card:hover {
  transform: translateX(5px);
  border-color: var(--accent-primary) !important;
  background: rgba(99, 102, 241, 0.08);
}

/* Active Mock Timer clock warning state */
#mock-timer-display {
  font-family: monospace;
  letter-spacing: 3px;
  text-shadow: 0 0 15px rgba(239, 68, 68, 0.4);
  animation: pulse-timer 1.5s infinite;
}

@keyframes pulse-timer {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

/* Spaced Repetition Flashcard Flip visual container style */
.flashcard-card-inner {
  transition: transform 0.6s;
  transform-style: preserve-3d;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.15);
}
.flashcard-card-inner:hover {
  border-color: var(--accent-secondary) !important;
  box-shadow: 0 8px 30px rgba(168, 85, 247, 0.25);
}
.border-indigo {
  border-color: var(--accent-primary) !important;
}

/* Markdown Notes Preview highlights */
.note-preview-card {
  transition: var(--transition-smooth);
}
.note-preview-card:hover {
  border-color: var(--accent-primary) !important;
  background: rgba(255,255,255,0.03);
}
.note-preview-card.active {
  border-color: var(--accent-secondary) !important;
  background: rgba(168, 85, 247, 0.08);
}