/* ==========================================================================
   TESTBANK — Refined Academic Design System
   ========================================================================== */

:root {
  /* Core Palette */
  --navy:       #1a2332;
  --navy-light: #2a3a4e;
  --navy-fade:  #3d526b;
  --gold:       #d4a843;
  --gold-light: #f0d78c;
  --gold-pale:  #faf3e0;
  --warm-bg:    #f7f5f2;
  --warm-card:  #ffffff;
  --warm-border:#e8e4de;
  --text-primary:  #1a2332;
  --text-secondary:#6b7a8d;
  --text-muted:    #9ba8b7;
  --success:    #2d8a56;
  --success-bg: #e8f5ee;
  --danger:     #c94444;
  --danger-bg:  #fce8e8;
  --warning:    #d4a843;
  --warning-bg: #faf3e0;

  /* Typography */
  --font-display: 'DM Serif Display', 'Georgia', serif;
  --font-body:    'DM Sans', 'Segoe UI', sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(26,35,50,0.06), 0 1px 2px rgba(26,35,50,0.04);
  --shadow-md:  0 4px 12px rgba(26,35,50,0.08), 0 2px 4px rgba(26,35,50,0.04);
  --shadow-lg:  0 10px 30px rgba(26,35,50,0.10), 0 4px 8px rgba(26,35,50,0.04);
  --shadow-gold:0 4px 20px rgba(212,168,67,0.15);

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

/* ==========================================================================
   BASE
   ========================================================================== */
body {
  font-family: var(--font-body);
  background: var(--warm-bg);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, .display-title {
  font-family: var(--font-display);
  color: var(--navy);
  letter-spacing: -0.01em;
}

h2 { font-size: 1.75rem; margin-bottom: 1.25rem; }

a { color: var(--navy); transition: color 0.2s; }
a:hover { color: var(--gold); }

/* ==========================================================================
   NAVBAR
   ========================================================================== */
.navbar-testbank {
  background: var(--navy) !important;
  box-shadow: 0 2px 16px rgba(26,35,50,0.18);
  padding: 0.5rem 0;
  border-bottom: 3px solid var(--gold);
}
.navbar-testbank .navbar-brand {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: #fff !important;
  letter-spacing: 0.02em;
}
.navbar-testbank .navbar-brand span {
  color: var(--gold);
}
.navbar-testbank .nav-link {
  color: rgba(255,255,255,0.75) !important;
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.65rem 1rem !important;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  margin: 0 2px;
}
.navbar-testbank .nav-link:hover,
.navbar-testbank .nav-link.active {
  color: #fff !important;
  background: rgba(255,255,255,0.1);
}
.navbar-testbank .dropdown-toggle::after { opacity: 0.6; }
.navbar-testbank .dropdown-menu {
  border: 1px solid var(--warm-border);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-md);
  padding: 0.5rem;
}
.navbar-testbank .dropdown-item {
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.75rem;
  font-size: 0.9rem;
}
.navbar-testbank .dropdown-item:hover { background: var(--warm-bg); }

/* ==========================================================================
   CARDS
   ========================================================================== */
.card {
  border: 1px solid var(--warm-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  background: var(--warm-card);
  transition: box-shadow 0.25s, transform 0.25s;
}
.card:hover {
  box-shadow: var(--shadow-md);
}
.card-header {
  background: transparent;
  border-bottom: 1px solid var(--warm-border);
  font-weight: 600;
  padding: 0.9rem 1.25rem;
}

/* Stat Cards */
.stat-card {
  text-align: center;
  padding: 1.5rem 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--warm-border);
  background: var(--warm-card);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s;
}
.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.stat-card .stat-value {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--navy);
  line-height: 1.2;
}
.stat-card .stat-label {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 0.25rem;
  font-weight: 500;
}
.stat-card.accent {
  border-color: var(--gold);
  background: linear-gradient(135deg, #fefcf7 0%, #faf3e0 100%);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn-primary {
  background: var(--navy);
  border-color: var(--navy);
  border-radius: var(--radius-sm);
  font-weight: 600;
  padding: 0.5rem 1.25rem;
  transition: all 0.2s;
}
.btn-primary:hover {
  background: var(--navy-light);
  border-color: var(--navy-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.btn-gold {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--navy);
  font-weight: 700;
  border-radius: var(--radius-sm);
  padding: 0.5rem 1.25rem;
  transition: all 0.2s;
}
.btn-gold:hover {
  background: #c49a38;
  border-color: #c49a38;
  color: var(--navy);
  transform: translateY(-1px);
  box-shadow: var(--shadow-gold);
}
.btn-outline-secondary {
  border-color: var(--warm-border);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
}
.btn-outline-secondary:hover {
  background: var(--warm-bg);
  border-color: var(--navy-fade);
  color: var(--navy);
}
.btn-success {
  background: var(--success);
  border-color: var(--success);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

/* ==========================================================================
   BADGES
   ========================================================================== */
.badge {
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  padding: 0.35em 0.65em;
  border-radius: 4px;
}
.badge-difficulty-1 { background: var(--success-bg); color: var(--success); }
.badge-difficulty-2 { background: var(--warning-bg); color: #9a7a20; }
.badge-difficulty-3 { background: var(--danger-bg); color: var(--danger); }
.badge-type { background: #e8f0fe; color: #2c5aa0; }
.badge-skill { background: #f0e8fe; color: #6b3fa0; }
.badge-section { background: var(--warm-bg); color: var(--text-secondary); }

/* ==========================================================================
   QUESTION TAKING — Choice Options
   ========================================================================== */
.choice-option {
  padding: 0.85rem 1.15rem;
  margin: 0.5rem 0;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 2px solid var(--warm-border);
  transition: all 0.2s ease;
  position: relative;
  background: var(--warm-card);
}
.choice-option:hover {
  border-color: var(--navy-fade);
  background: #f8f9fa;
  transform: translateX(4px);
}
.choice-option.selected {
  background: linear-gradient(135deg, #e8f0fe 0%, #dbe7fd 100%);
  border-color: var(--navy);
  box-shadow: 0 0 0 1px var(--navy);
}
.choice-option.selected::after {
  content: '\2713';
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--navy);
  font-weight: 700;
  font-size: 1.1rem;
}
.choice-option.correct {
  background: var(--success-bg);
  border-color: var(--success);
}
.choice-option.incorrect {
  background: var(--danger-bg);
  border-color: var(--danger);
}

/* ==========================================================================
   QUESTION NAVIGATION SIDEBAR
   ========================================================================== */
.question-nav-btn {
  width: 40px;
  height: 40px;
  padding: 0;
  font-weight: 700;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--warm-border);
  background: var(--warm-card);
  color: var(--text-secondary);
  transition: all 0.2s;
}
.question-nav-btn:hover {
  border-color: var(--navy-fade);
  color: var(--navy);
}
.question-nav-btn.answered {
  background: var(--success) !important;
  border-color: var(--success) !important;
  color: #fff !important;
}
.question-nav-btn.current {
  border-color: var(--gold) !important;
  box-shadow: 0 0 0 2px var(--gold-light);
  color: var(--navy);
  font-weight: 800;
}

/* Timer */
.timer-card {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  color: #fff;
  border: none;
}
.timer-card .timer-display {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gold-light);
}
.timer-card .timer-label {
  font-size: 0.75rem;
  opacity: 0.7;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ==========================================================================
   TABLES
   ========================================================================== */
.table {
  --bs-table-hover-bg: var(--gold-pale);
  font-size: 0.9rem;
}
.table thead th {
  background: var(--navy);
  color: #fff;
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: none;
  padding: 0.75rem 1rem;
}
.table tbody td {
  padding: 0.75rem 1rem;
  vertical-align: middle;
  border-color: var(--warm-border);
}

/* ==========================================================================
   ALERTS & CONTEXT BLOCKS
   ========================================================================== */
.context-block {
  background: linear-gradient(135deg, #fefcf7 0%, #f8f4ed 100%);
  border: 1px solid #e5ddd0;
  border-left: 4px solid var(--gold);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  font-size: 0.92rem;
  line-height: 1.65;
}
.context-block .context-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gold);
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.alert-success { background: var(--success-bg); border-color: #b8dfc8; color: #1a6b3a; }
.alert-danger  { background: var(--danger-bg);  border-color: #f0c0c0; color: #993333; }
.alert-info    { background: #e8f0fe; border-color: #b8d0f0; color: #2c5aa0; }
.alert-warning { background: var(--warning-bg); border-color: #e5d5a0; color: #7a6020; }

/* ==========================================================================
   ASSIGNMENT CARDS (Dashboard)
   ========================================================================== */
.assignment-card {
  border-radius: var(--radius-md);
  border: 1px solid var(--warm-border);
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
  background: var(--warm-card);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}
.assignment-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.assignment-card .assignment-title {
  font-weight: 600;
  color: var(--navy);
  font-size: 1rem;
}
.assignment-card .assignment-meta {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* ==========================================================================
   FORMS
   ========================================================================== */
.form-control, .form-select {
  border: 1.5px solid var(--warm-border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.85rem;
  font-size: 0.9rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-control:focus, .form-select:focus {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(212,168,67,0.15);
}
.form-label {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}

/* Login Card */
.login-card {
  max-width: 420px;
  margin: 3rem auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: none;
  overflow: hidden;
}
.login-card .login-header {
  background: var(--navy);
  color: #fff;
  padding: 2rem;
  text-align: center;
}
.login-card .login-header h3 {
  font-family: var(--font-display);
  color: #fff;
  margin: 0;
  font-size: 1.5rem;
}
.login-card .login-header .login-subtitle {
  color: var(--gold-light);
  font-size: 0.85rem;
  margin-top: 0.25rem;
}
.login-card .card-body { padding: 2rem; }

/* ==========================================================================
   ANALYTICS CHARTS
   ========================================================================== */
.chart-card {
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  background: var(--warm-card);
  border: 1px solid var(--warm-border);
  box-shadow: var(--shadow-sm);
}
.chart-card h5 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--navy);
}

/* ==========================================================================
   QUESTION TEXT
   ========================================================================== */
.question-text {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

/* MathJax overrides for consistent sizing */
.MathJax { font-size: 1em !important; }

/* ==========================================================================
   SCORE DISPLAY
   ========================================================================== */
.score-display {
  display: inline-flex;
  align-items: baseline;
  gap: 0.15rem;
}
.score-display .score-value {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--navy);
}
.score-display .score-max {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.4s ease-out both; }
.fade-in-1 { animation-delay: 0.05s; }
.fade-in-2 { animation-delay: 0.10s; }
.fade-in-3 { animation-delay: 0.15s; }
.fade-in-4 { animation-delay: 0.20s; }

/* Page header */
.page-header {
  margin-bottom: 1.75rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--warm-border);
}
.page-header h2 {
  margin-bottom: 0.25rem;
}
.page-header .page-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 768px) {
  .choice-option {
    padding: 0.9rem 1rem;
    font-size: 1rem;
  }
  .choice-option:hover { transform: none; }
  .stat-card .stat-value { font-size: 1.5rem; }
  h2 { font-size: 1.4rem; }
}