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

:root {
  /* Colors - Light Mode (Default) */
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-hover: #f1f5f9;
  --bg-surface-glass: rgba(255, 255, 255, 0.7);
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  --border-light: #e2e8f0;
  --border-focus: #6366f1;
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #e0e7ff;
  
  --success: #10b981;
  --success-light: #d1fae5;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --info: #3b82f6;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-body: #0f172a;
  --bg-surface: #1e293b;
  --bg-surface-hover: #334155;
  --bg-surface-glass: rgba(30, 41, 59, 0.7);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  
  --border-light: #334155;
  --primary-light: #3730a3;
  --success-light: #064e3b;
  --warning-light: #78350f;
  --danger-light: #7f1d1d;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

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

body {
  font-family: 'Plus Jakarta Sans', sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.5;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-hover);
}

/* Glassmorphism Classes */
.glass {
  background: var(--bg-surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-glass);
}
[data-theme="dark"] .glass {
  border: 1px solid rgba(255, 255, 255, 0.05);
}

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

.sidebar {
  width: 260px;
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal);
  z-index: 40;
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  height: 70px;
  background-color: var(--bg-surface-glass);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  position: sticky;
  top: 0;
  z-index: 30;
}

.content-area {
  padding: 2rem;
  flex: 1;
  overflow-y: auto;
}

/* UI Components */
.card {
  background-color: var(--bg-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 1.5rem;
  border: 1px solid var(--border-light);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  font-family: inherit;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--primary);
  color: var(--text-inverse);
  box-shadow: 0 4px 14px 0 rgba(99, 102, 241, 0.39);
}

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

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--border-light);
  color: var(--text-main);
}

.btn-outline:hover {
  background-color: var(--bg-surface-hover);
  border-color: var(--primary);
}

/* Forms */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-main);
  font-size: 0.875rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  background-color: var(--bg-surface);
  color: var(--text-main);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* Auth Pages */
.auth-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-body) 0%, var(--primary-light) 100%);
  padding: 1rem;
}
[data-theme="dark"] .auth-wrapper {
  background: linear-gradient(135deg, var(--bg-body) 0%, #1e1b4b 100%);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  padding: 2.5rem;
  border-radius: var(--radius-xl);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success { background: var(--success-light); color: var(--success); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-danger { background: var(--danger-light); color: var(--danger); }
.badge-primary { background: var(--primary-light); color: var(--primary); }

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

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th, .table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

.table th {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.875rem;
  background-color: var(--bg-surface-hover);
}

.table tbody tr {
  transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
  background-color: var(--bg-surface-hover);
}

/* Utils */
.d-flex { display: flex; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }
.w-100 { width: 100%; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }

/* Grid */
.grid { display: grid; gap: 1.5rem; }
.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
  .grid-cols-3, .grid-cols-4 { grid-template-columns: repeat(1, 1fr); }
  .sidebar { transform: translateX(-100%); position: fixed; height: 100vh; }
  .sidebar.open { transform: translateX(0); }
}

/* Exam taking specific */
.exam-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 60px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-light);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
}

.exam-body {
  margin-top: 60px;
  padding: 2rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.question-number-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
}

.q-box {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  background: var(--bg-surface);
}

.q-box.answered {
  background: var(--success);
  color: white;
  border-color: var(--success);
}

.q-box.active {
  border: 2px solid var(--primary);
  box-shadow: 0 0 0 2px var(--primary-light);
}

/* Toast/Alerts */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border: 1px solid transparent;
}
.alert-success { background: var(--success-light); color: var(--success); border-color: var(--success); }
.alert-error, .alert-danger { background: var(--danger-light); color: var(--danger); border-color: var(--danger); }
.alert-info { background: var(--primary-light); color: var(--primary); border-color: var(--primary); }