/* =====================================================
   MockPrep - Main CSS Design System
   ===================================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Outfit:wght@400;600;700;800&display=swap');

/* ---- CSS Custom Properties (Design Tokens) ---- */
:root {
  /* Brand Colors */
  --brand-primary: #6366f1;
  --brand-secondary: #8b5cf6;
  --brand-accent: #06b6d4;
  --brand-success: #10b981;
  --brand-warning: #f59e0b;
  --brand-danger: #ef4444;
  --brand-info: #3b82f6;

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --grad-accent: linear-gradient(135deg, #06b6d4 0%, #6366f1 100%);
  --grad-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --grad-warm: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
  --grad-glass: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);

  /* Dark Theme (Default) */
  --bg-primary: #0a0a14;
  --bg-secondary: #111124;
  --bg-card: #16162a;
  --bg-card-hover: #1e1e38;
  --bg-glass: rgba(22,22,42,0.8);
  --bg-input: #1c1c34;
  --bg-sidebar: #0e0e20;
  --bg-navbar: rgba(10,10,20,0.95);

  /* Text Colors */
  --text-primary: #f0f0ff;
  --text-secondary: #a0a0c0;
  --text-muted: #6060a0;
  --text-white: #ffffff;

  /* Borders */
  --border-subtle: rgba(255,255,255,0.06);
  --border-medium: rgba(255,255,255,0.12);
  --border-strong: rgba(99,102,241,0.4);
  --border-focus: #6366f1;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(99,102,241,0.3);
  --shadow-glow-sm: 0 0 10px rgba(99,102,241,0.2);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-med: 0.25s ease;
  --transition-slow: 0.4s ease;

  /* Spacing */
  --sidebar-width: 260px;
  --navbar-height: 64px;
}

/* ---- Reset & Base ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select, textarea { font-family: inherit; }
ul, ol { list-style: none; }

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', 'Inter', sans-serif;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-white);
}

h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.4rem, 3vw, 1.8rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.3rem); }

.gradient-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---- Utility Classes ---- */
.hidden { display: none !important; }
.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.w-full { width: 100%; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-muted { color: var(--text-secondary); }
.text-success { color: var(--brand-success); }
.text-danger { color: var(--brand-danger); }
.text-warning { color: var(--brand-warning); }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

/* ---- Buttons ---- */
.btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.875rem 1.5rem;
  background: var(--grad-primary);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-med);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--transition-fast);
}

.btn-primary:hover::before { background: rgba(255,255,255,0.12); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  background: transparent;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
  background: rgba(99,102,241,0.08);
  transform: translateY(-1px);
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-medium);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.btn-icon:hover {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
  background: rgba(99,102,241,0.1);
  transform: translateY(-2px);
}

.btn-danger {
  background: var(--brand-danger);
  color: white;
}
.btn-success {
  background: var(--brand-success);
  color: white;
}


/* ---- Cards ---- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all var(--transition-med);
}

.card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-md);
}

.card-glass {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

/* ---- Alerts ---- */
.alert {
  padding: 0.875rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 1rem;
  border: 1px solid transparent;
}

.alert-error {
  background: rgba(239,68,68,0.1);
  border-color: rgba(239,68,68,0.3);
  color: #fca5a5;
}

.alert-success {
  background: rgba(16,185,129,0.1);
  border-color: rgba(16,185,129,0.3);
  color: #6ee7b7;
}

.alert-info {
  background: rgba(59,130,246,0.1);
  border-color: rgba(59,130,246,0.3);
  color: #93c5fd;
}

.alert-warning {
  background: rgba(245,158,11,0.1);
  border-color: rgba(245,158,11,0.3);
  color: #fcd34d;
}

/* ---- Form Elements ---- */
.form-group {
  margin-bottom: 1.125rem;
}

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

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 0.875rem;
  font-size: 1rem;
  pointer-events: none;
  z-index: 1;
}

.input-wrapper input,
.input-wrapper select,
.input-wrapper textarea {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.75rem;
  background: var(--bg-input);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  outline: none;
}

.input-wrapper input:focus,
.input-wrapper select:focus,
.input-wrapper textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}

.input-wrapper input::placeholder { color: var(--text-muted); }

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; }

/* ---- 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-primary { background: rgba(99,102,241,0.2); color: #a5b4fc; }
.badge-success { background: rgba(16,185,129,0.2); color: #6ee7b7; }
.badge-warning { background: rgba(245,158,11,0.2); color: #fcd34d; }
.badge-danger  { background: rgba(239,68,68,0.2);  color: #fca5a5; }
.badge-info    { background: rgba(6,182,212,0.2);  color: #67e8f9; }

/* ---- Progress Bar ---- */
.progress-bar {
  height: 6px;
  background: var(--border-subtle);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--grad-primary);
  border-radius: var(--radius-full);
  transition: width 0.6s ease;
}

/* ---- Skeleton Loader ---- */
.skeleton {
  background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-card-hover) 50%, var(--bg-card) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

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

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border-medium); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--brand-primary); }

/* ---- Toast Notifications ---- */
#toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  font-weight: 500;
  min-width: 280px;
  max-width: 380px;
  pointer-events: all;
  animation: slideInRight 0.3s ease forwards;
  backdrop-filter: blur(20px);
}

.toast.toast-success { border-left: 3px solid var(--brand-success); }
.toast.toast-error   { border-left: 3px solid var(--brand-danger); }
.toast.toast-info    { border-left: 3px solid var(--brand-info); }
.toast.toast-warning { border-left: 3px solid var(--brand-warning); }
.toast.fade-out { animation: fadeOut 0.3s ease forwards; }

@keyframes slideInRight {
  from { transform: translateX(120%); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

@keyframes fadeOut {
  from { opacity: 1; transform: translateX(0); }
  to   { opacity: 0; transform: translateX(120%); }
}

/* ---- Spinner ---- */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255,255,255,0.2);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---- Modal ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fadeIn 0.2s ease;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  padding: 2rem;
  max-width: 560px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  animation: scaleIn 0.25s ease;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.modal-close:hover { background: var(--bg-card-hover); color: var(--text-primary); }

@keyframes fadeIn  { from { opacity: 0; } to { opacity: 1; } }
@keyframes scaleIn { from { transform: scale(0.9); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* ---- Chip / Tags ---- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-medium);
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--bg-input);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.chip:hover, .chip.active {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
  background: rgba(99,102,241,0.1);
}

/* ---- Table ---- */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.data-table th {
  padding: 0.875rem 1rem;
  background: var(--bg-card-hover);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  text-align: left;
  white-space: nowrap;
}

.data-table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-primary);
  vertical-align: middle;
}

.data-table tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover td { background: rgba(255,255,255,0.02); }

/* ---- Avatar ---- */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  background: var(--grad-primary);
  color: white;
  flex-shrink: 0;
}
.avatar-sm { width: 32px; height: 32px; font-size: 0.75rem; }
.avatar-lg { width: 56px; height: 56px; font-size: 1.1rem; }
.avatar-xl { width: 72px; height: 72px; font-size: 1.4rem; }

/* ---- Divider ---- */
.divider {
  height: 1px;
  background: var(--border-subtle);
  margin: 1.5rem 0;
}

/* ---- Stat Card ---- */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: all var(--transition-med);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--grad-primary);
}

.stat-card:hover {
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-card .stat-icon {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.stat-card .stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  font-family: 'Outfit', sans-serif;
  color: var(--text-white);
}

.stat-card .stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.stat-card .stat-change {
  font-size: 0.8rem;
  font-weight: 600;
}
.stat-change.up { color: var(--brand-success); }
.stat-change.down { color: var(--brand-danger); }

/* ---- Empty State ---- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
  text-align: center;
  gap: 1rem;
}

.empty-icon {
  font-size: 3rem;
  opacity: 0.5;
}

.empty-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.empty-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  max-width: 280px;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
    --navbar-height: 56px;
  }
}

/* ---- Dashboard Styles ---- */
.dashboard {
  min-height: 100vh;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
}

.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-subtle);
}

.dashboard-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin: 0;
}

.dashboard-content {
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.quick-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.quick-actions button {
  padding: 0.75rem 1.5rem;
  background: var(--grad-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-actions button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

#content-area {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

#content-area h2 {
  margin-top: 0;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  font-weight: 600;
}

.exam-card, .tier-card, .test-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin-bottom: 1rem;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.exam-card:hover, .tier-card:hover, .test-card:hover {
  border-color: var(--brand-primary);
  transform: translateY(-2px);
}

.exam-card h3, .tier-card h3, .test-card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
  font-weight: 600;
}

.exam-card p, .tier-card p, .test-card p {
  margin: 0.5rem 0;
  color: var(--text-secondary);
}

.exam-card button, .tier-card button, .test-card button {
  padding: 0.5rem 1rem;
  background: var(--brand-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.exam-card button:hover, .tier-card button:hover, .test-card button:hover {
  background: var(--brand-secondary);
}