/* ==========================================================================
   1. BASE & VARIABLES (CBT System v1.3.0)
   ========================================================================== */

:root {
  /* Background & Surface Light Theme */
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-panel: #f1f5f9;
  
  /* Text Colors */
  --text-dark: #0f172a;
  --text-muted: #64748b;
  
  /* Brand & Accents (Dominan Biru) */
  --brand-primary: #1e40af;
  --brand-sky: #0284c7;
  --brand-cyan: #09090b;
  --accent-blue: #2563eb;
  
  /* Status Warna Bulatan CBT */
  --color-unanswered: #ef4444;
  --color-answered: #0284c7;
  --color-active: #16a34a;
  
  /* Status Hasil Ujian & Alert */
  --color-success: #16a34a;
  --color-danger: #dc2626;
  --color-warning: #d97706;
  --color-info: #2563eb;

  /* Shadows & Borders */
  --shadow-card: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
  --shadow-glow-blue: 0 0 12px rgba(37, 99, 235, 0.25);
  --border-light: 1px solid #e2e8f0;
  --border-radius: 12px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
}

body {
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(37, 99, 235, 0.04), transparent 25%),
    radial-gradient(circle at 85% 30%, rgba(2, 132, 199, 0.04), transparent 25%);
  color: var(--text-dark);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.hidden {
  display: none !important;
}

/* ==========================================
   BUTTONS & ALERTS
   ========================================== */
.btn-primary {
  width: 100%;
  padding: 13px;
  background: linear-gradient(135deg, var(--brand-primary), var(--accent-blue));
  color: #ffffff;
  border: none;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
  margin-top: 10px;
  text-transform: uppercase;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.35);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-warning {
  width: 100%;
  padding: 12px;
  background: #d97706;
  color: #ffffff;
  border: none;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  text-transform: uppercase;
}

.btn-warning:hover:not(:disabled) {
  background: #b45309;
}

.btn-secondary {
  padding: 13px 20px;
  background: #ffffff;
  color: var(--brand-primary);
  border: 1px solid var(--brand-primary);
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: #eff6ff;
}

.alert {
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 0.88rem;
  margin-top: 12px;
  line-height: 1.5;
}

.alert-danger {
  background-color: #fef2f2;
  border: 1px solid #fca5a5;
  color: var(--color-danger);
}

.alert-success {
  background-color: #f0fdf4;
  border: 1px solid #86efac;
  color: var(--color-success);
}

.alert-info {
  background-color: #eff6ff;
  border: 1px solid #93c5fd;
  color: var(--color-info);
}

.error-msg {
  color: var(--color-danger);
  font-size: 0.88rem;
  text-align: center;
  margin-top: 14px;
  font-weight: 600;
}