* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f6f7f9;
  color: #1f2937;
  line-height: 1.45;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 18px 14px 28px;
}

.title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
}

.muted {
  margin: 6px 0 0;
  color: #6b7280;
  font-size: 0.92rem;
}

.label {
  margin: 0 0 8px;
  font-size: 0.94rem;
  font-weight: 700;
}

.panel {
  margin-top: 12px;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 12px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 10px;
}

.card {
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 10px;
  background: #ffffff;
}

.block-card {
  position: relative;
  padding-bottom: 42px;
}

.block-card.started {
  background-color: #fff3cd;
}

.block-card.completed {
  background-color: #d4edda;
}

.card h3 {
  margin: 0 0 6px;
  font-size: 0.98rem;
}

.card p {
  margin: 0 0 8px;
  color: #6b7280;
  font-size: 0.9rem;
}

.block-card-stats {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0 0 8px;
}

.block-card-stars {
  font-size: 0.82rem;
  line-height: 1.3;
  font-weight: 600;
  color: #b45309;
  letter-spacing: 0.02em;
}

.block-card-errors {
  font-size: 0.78rem;
  color: #9ca3af;
  font-weight: 500;
}

.reset-block-btn {
  position: absolute;
  bottom: 10px;
  right: 10px;
  font-size: 12px;
  padding: 4px 8px;
  background: #eee;
  border: none;
  cursor: pointer;
}

.reset-block-btn:hover {
  background: #ddd;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.btn {
  border: 1px solid #d1d5db;
  border-radius: 8px;
  background: #ffffff;
  color: #1f2937;
  padding: 8px 10px;
  font-size: 0.92rem;
  cursor: pointer;
}

.btn-primary {
  background: #2563eb;
  border-color: #2563eb;
  color: #ffffff;
}

.message {
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 10px;
  background: #fafafa;
  font-size: 0.94rem;
}

.hidden {
  display: none !important;
}

.question {
  margin: 0 0 8px;
  font-size: 0.95rem;
  font-weight: 700;
}

.input {
  width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.92rem;
}

.options {
  display: grid;
  gap: 6px;
}

.option {
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 8px;
}

.option-correct {
  border-color: #16a34a;
  background: #f0fdf4;
}

.option-wrong {
  border-color: #dc2626;
  background: #fef2f2;
}

.result-item {
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 8px;
  margin-top: 8px;
  font-size: 0.92rem;
  background: #ffffff;
}

.ok {
  color: #166534;
  font-weight: 700;
}

.bad {
  color: #b91c1c;
  font-weight: 700;
}

.question-image {
  display: block;
  max-width: 100%;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  margin: 0 0 8px;
}

.is-locked {
  pointer-events: none;
}

.feedback-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(17, 24, 39, 0.45);
  padding: 16px;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.feedback-overlay.show {
  opacity: 1;
}

.feedback-overlay-box {
  width: min(440px, 100%);
  border-radius: 10px;
  padding: 14px;
  border: 2px solid transparent;
  background: #ffffff;
}

.feedback-box {
  width: min(440px, 100%);
  border-radius: 10px;
  padding: 14px;
  border: 2px solid transparent;
  background: #ffffff;
}

.feedback-overlay-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
}

.feedback-overlay-answer {
  margin: 8px 0 0;
  font-size: 0.94rem;
}

.overlay-correct-answer {
  margin-top: 6px;
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.2;
  word-break: break-word;
}

.feedback-correct {
  border-color: #16a34a;
  background: #f0fdf4;
  color: #166534;
}

.feedback-wrong {
  border-color: #dc2626;
  background: #fef2f2;
  color: #991b1b;
}

.feedback-box.correct {
  border-color: #16a34a;
  background: #f0fdf4;
  color: #166534;
}

.feedback-box.wrong {
  border-color: #dc2626;
  background: #fef2f2;
  color: #991b1b;
}

.intro-content h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
}

.intro-content p {
  margin: 0 0 8px;
  font-size: 0.94rem;
}

.intro-content strong {
  font-weight: 700;
}