/* ==========================================================================
   EDUPORTAL NIGERIAN SECONDARY SCHOOL CBT ENGINE - UX DESIGN SYSTEM
   Standardized, High-Contrast, Ergonomic Light Theme (JAMB/WAEC Class Standard)
   ========================================================================== */

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

:root {
  /* Institutional Palette */
  --cbt-navy-900: #0f2a4a;
  --cbt-navy-800: #1e3a8a;
  --cbt-navy-700: #1d4ed8;
  --cbt-blue-600: #2563eb;
  --cbt-blue-500: #3b82f6;
  --cbt-blue-50:  #eff6ff;

  --cbt-bg-main: #f8fafc;
  --cbt-card-bg: #ffffff;
  --cbt-border:  #cbd5e1;
  --cbt-border-dark: #94a3b8;

  --cbt-text-dark: #0f172a;
  --cbt-text-body: #1e293b;
  --cbt-text-muted: #475569;

  /* Status Colors */
  --cbt-success: #15803d;
  --cbt-success-bg: #f0fdf4;
  --cbt-warning: #b45309;
  --cbt-warning-bg: #fef3c7;
  --cbt-danger: #b91c1c;
  --cbt-danger-bg: #fef2f2;
  --cbt-flagged: #7c3aed;
  --cbt-flagged-bg: #f3e8ff;

  /* Typography */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Public Sans', var(--font-main);

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--cbt-bg-main);
  color: var(--cbt-text-body);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

.cbt-navbar {
  background-color: var(--cbt-navy-900);
  color: #ffffff;
  padding: 0.85rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 4px solid var(--cbt-navy-700);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.cbt-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #ffffff;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
}

.cbt-brand-crest {
  width: 40px;
  height: 40px;
  background: #ffffff;
  color: var(--cbt-navy-900);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 900;
  overflow: hidden;
}

.cbt-brand-crest img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.cbt-nav-menu { display: flex; align-items: center; gap: 0.5rem; }

.cbt-nav-link {
  color: #93c5fd;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.cbt-nav-link:hover, .cbt-nav-link.active {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.15);
}

.btn-nav-logout {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #ffffff !important;
  font-size: 0.85rem;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-nav-logout:hover {
  background: #dc2626;
  border-color: #dc2626;
  color: #ffffff !important;
}

.cbt-container { max-width: 1320px; margin: 0 auto; padding: 2rem 1.5rem; }

.page-header {
  margin-bottom: 1.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--cbt-border);
  padding-bottom: 1rem;
}

.page-title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--cbt-navy-900);
}

.page-subtitle { color: var(--cbt-text-muted); font-size: 0.95rem; margin-top: 2px; }

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.metric-card {
  background: var(--cbt-card-bg);
  border: 1px solid var(--cbt-border);
  border-left: 5px solid var(--cbt-navy-700);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.metric-value {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--cbt-navy-900);
}

.metric-label { font-size: 0.88rem; font-weight: 600; color: var(--cbt-text-muted); }

.cbt-card {
  background: var(--cbt-card-bg);
  border: 1px solid var(--cbt-border);
  border-radius: var(--radius-md);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  margin-bottom: 1.5rem;
}

.cbt-card-header {
  padding: 1rem 1.5rem;
  background: var(--cbt-blue-50);
  border-bottom: 1px solid var(--cbt-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cbt-card-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--cbt-navy-900);
}

.cbt-card-body { padding: 1.5rem; }

.cbt-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }

.cbt-table th {
  background: var(--cbt-navy-900);
  color: #ffffff;
  font-weight: 700;
  padding: 12px 16px;
  text-align: left;
}

.cbt-table td { padding: 12px 16px; border-bottom: 1px solid var(--cbt-border); }

.cbt-table tr:nth-child(even) { background-color: var(--cbt-bg-main); }

.badge { display: inline-block; padding: 4px 10px; border-radius: var(--radius-sm); font-size: 0.8rem; font-weight: 700; }
.badge-active { background: var(--cbt-success-bg); color: var(--cbt-success); border: 1px solid #bbf7d0; }
.badge-upcoming { background: var(--cbt-warning-bg); color: var(--cbt-warning); border: 1px solid #fde68a; }
.badge-completed { background: var(--cbt-blue-50); color: var(--cbt-navy-700); border: 1px solid #bfdbfe; }
.badge-past { background: #f1f5f9; color: var(--cbt-text-muted); border: 1px solid var(--cbt-border); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  font-family: var(--font-main);
}

.btn-primary { background: var(--cbt-navy-800); color: #ffffff; }
.btn-primary:hover { background: var(--cbt-navy-900); }

.btn-success { background: var(--cbt-success); color: #ffffff; }
.btn-success:hover { background: #166534; }

.btn-outline { background: #ffffff; border-color: var(--cbt-border-dark); color: var(--cbt-text-dark); }
.btn-outline:hover { background: var(--cbt-bg-main); }

.btn-danger { background: var(--cbt-danger); color: #ffffff; }

.form-group { margin-bottom: 1.25rem; }
.form-label { display: block; font-size: 0.9rem; font-weight: 700; color: var(--cbt-navy-900); margin-bottom: 6px; }
.form-control { width: 100%; padding: 10px 14px; font-size: 0.95rem; border: 1px solid var(--cbt-border-dark); border-radius: var(--radius-sm); background: #ffffff; color: var(--cbt-text-dark); }
.form-control:focus { outline: none; border-color: var(--cbt-blue-600); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2); }

/* Student Header & Test Runner */
.student-exam-header {
  background: var(--cbt-navy-900);
  color: #ffffff;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 4px solid var(--cbt-navy-700);
}

.student-info-strip {
  background: #ffffff;
  border-bottom: 2px solid var(--cbt-border);
  padding: 12px 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.95rem;
}

.cbt-timer-badge {
  background: var(--cbt-danger);
  color: #ffffff;
  font-family: monospace;
  font-size: 1.6rem;
  font-weight: 800;
  padding: 6px 18px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
}

.question-box {
  background: #ffffff;
  border: 2px solid var(--cbt-border-dark);
  border-radius: var(--radius-md);
  padding: 2rem;
  margin-bottom: 1.5rem;
  min-height: 420px;
}

.question-text-content {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--cbt-text-dark);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.student-option-btn {
  display: flex;
  align-items: center;
  gap: 16px;
  background: #ffffff;
  border: 2px solid var(--cbt-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
  font-size: 1.05rem;
  font-weight: 500;
}

.student-option-btn:hover {
  background: var(--cbt-blue-50);
  border-color: var(--cbt-blue-500);
}

.student-option-btn.selected {
  background: #dbeafe;
  border-color: var(--cbt-navy-700);
  border-width: 3px;
  font-weight: 700;
}

.option-badge {
  width: 34px;
  height: 34px;
  background: var(--cbt-navy-900);
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  flex-shrink: 0;
}

.student-option-btn.selected .option-badge { background: var(--cbt-blue-600); }

.palette-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; }

.palette-num-btn {
  aspect-ratio: 1;
  font-weight: 700;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--cbt-border-dark);
  background: #ffffff;
  color: var(--cbt-text-dark);
  cursor: pointer;
}

.palette-num-btn.active-q { border: 3px solid var(--cbt-navy-900); background: #ffffff; color: var(--cbt-navy-900); font-weight: 900; }
.palette-num-btn.answered-q { background: var(--cbt-navy-700); color: #ffffff; border-color: var(--cbt-navy-900); }
.palette-num-btn.flagged-q { background: var(--cbt-flagged); color: #ffffff; }

.keyboard-hints-bar {
  background: var(--cbt-navy-900);
  color: #ffffff;
  padding: 10px 2rem;
  font-size: 0.85rem;
  display: flex;
  justify-content: center;
  gap: 24px;
  font-weight: 600;
}

.key-cap {
  background: #ffffff;
  color: var(--cbt-navy-900);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: monospace;
  font-weight: 800;
}

/* Print Overrides */
.slip-card-wrapper {
  background: #ffffff;
  color: #0f2a4a;
  border: 2px solid #0f2a4a;
  border-radius: var(--radius-md);
  padding: 2rem;
  margin-bottom: 1.5rem;
}

@media print {
  body { background: #ffffff !important; color: #000000 !important; }
  .cbt-navbar, .no-print, .btn, .keyboard-hints-bar { display: none !important; }
  .slip-card-wrapper { border: 2px solid #000000 !important; box-shadow: none !important; margin: 0 !important; padding: 1rem !important; page-break-inside: avoid; }
}