:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text-dark: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --radius: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 20px -2px rgba(0,0,0,0.05);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Plus Jakarta Sans', -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg);
  color: var(--text-dark);
  padding-bottom: 60px;
}

.top-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
}

.top-bar-content {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.progress-info {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
}

.progress-bar-bg {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 99px;
  margin-top: 8px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--primary);
  transition: width 0.3s ease;
  border-radius: 99px;
}

.container {
  max-width: 760px;
  margin: 32px auto 0;
  padding: 0 20px;
}

.header-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  margin-bottom: 24px;
}

.badge {
  display: inline-block;
  padding: 6px 12px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.result-badge {
  background: var(--success-bg);
  color: var(--success);
}

h1 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-dark);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

p.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.input-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.input-card label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 8px;
  color: var(--text-dark);
}

.input-card input {
  width: 100%;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1.5px solid var(--border);
  font-size: 0.95rem;
  outline: none;
  transition: all 0.2s;
  background: var(--bg);
}

.input-card input:focus {
  border-color: var(--primary);
  background: var(--surface);
  box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.input-card input:disabled {
  background-color: #f1f5f9;
  color: var(--text-muted);
  cursor: not-allowed;
}

.question-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
  transition: border-color 0.2s;
}

.question-number {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 6px;
  display: block;
}

.question-text {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-dark);
  line-height: 1.5;
  margin-bottom: 20px;
}

.options-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.option-label {
  display: flex;
  align-items: center;
  padding: 14px 18px;
  border-radius: 12px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  user-select: none;
}

.option-label:hover {
  border-color: #cbd5e1;
  background: #f1f5f9;
  transform: translateY(-1px);
}

.option-label input[type="radio"] {
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid #cbd5e1;
  border-radius: 50%;
  margin-right: 14px;
  outline: none;
  transition: all 0.2s ease;
  position: relative;
  flex-shrink: 0;
}

.option-label input[type="radio"]:checked {
  border-color: var(--primary);
  background-color: var(--primary);
  box-shadow: inset 0 0 0 3px #fff;
}

.option-label:has(input[type="radio"]:checked) {
  border-color: var(--primary);
  background: var(--primary-light);
  font-weight: 600;
}

.option-text {
  font-size: 0.95rem;
  color: var(--text-dark);
}

.option-label.locked {
  pointer-events: none;
  cursor: default;
}

.option-label.locked:hover {
  transform: none;
  background: var(--surface);
}

.btn-submit {
  width: 100%;
  background: var(--primary);
  color: white;
  border: none;
  padding: 16px;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
  margin-top: 10px;
}

.btn-submit:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
}

.btn-submit:disabled {
  background: var(--text-muted);
  cursor: not-allowed;
  box-shadow: none;
  transform: none !important;
  opacity: 0.7;
}

#resultDashboard {
  display: none;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  margin-bottom: 24px;
  text-align: center;
  animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

#resultName {
  margin-top: 8px;
  font-size: 1.5rem;
}

.score-circle {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 20px auto;
  border: 4px solid #c7d2fe;
}

.score-number {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1;
}

.score-total {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-top: 2px;
}

#resultStatus {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.option-label.is-correct {
  background-color: var(--success-bg) !important;
  border-color: var(--success-border) !important;
  color: #065f46 !important;
}

.option-label.is-correct input[type="radio"] {
  border-color: var(--success) !important;
  background-color: var(--success) !important;
}

.option-label.is-wrong {
  background-color: var(--danger-bg) !important;
  border-color: var(--danger-border) !important;
  color: #991b1b !important;
}

.option-label.is-wrong input[type="radio"] {
  border-color: var(--danger) !important;
  background-color: var(--danger) !important;
}

@media (max-width: 640px) {
  .container {
    margin-top: 16px;
  }

  .header-card,
  .question-card,
  #resultDashboard {
    padding: 20px;
  }

  h1 {
    font-size: 1.4rem;
  }
}