:root {
  --hpe-green: #01a982;
  --hpe-green-dark: #017a5e;
  --bg: #f5f7f8;
  --card-bg: #ffffff;
  --text: #1f2933;
  --muted: #6b7780;
  --border: #d8dde1;
  --danger: #c83232;
  --success: #2a8f3a;
  --warning: #d08c1d;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

header {
  background: var(--card-bg);
  border-bottom: 3px solid var(--hpe-green);
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand .bar {
  display: inline-block;
  width: 28px;
  height: 4px;
  background: var(--hpe-green);
}

.brand h1 {
  font-size: 1.15rem;
  margin: 0;
  font-weight: 600;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

#score-display {
  font-weight: 600;
  color: var(--hpe-green-dark);
}

main {
  max-width: 880px;
  margin: 28px auto;
  padding: 0 20px;
}

.card {
  background: var(--card-bg);
  border-radius: 8px;
  padding: 26px 28px;
  margin-bottom: 22px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card h2 {
  margin-top: 0;
  border-bottom: 2px solid var(--hpe-green);
  padding-bottom: 8px;
  display: inline-block;
}

.form-row {
  margin-bottom: 18px;
}

.form-row > label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}

select, input[type="text"] {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 1rem;
  width: 100%;
  max-width: 320px;
  background: white;
}

.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #fafbfc;
  cursor: pointer;
  font-size: 0.92rem;
}

.checkbox-group label:hover {
  border-color: var(--hpe-green);
}

.checkbox-group input[type="checkbox"] {
  accent-color: var(--hpe-green);
}

button {
  font-family: inherit;
  font-size: 1rem;
  padding: 10px 20px;
  border-radius: 4px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 500;
}

button.primary {
  background: var(--hpe-green);
  color: white;
  border-color: var(--hpe-green);
}

button.primary:hover {
  background: var(--hpe-green-dark);
  border-color: var(--hpe-green-dark);
}

button.ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

button.ghost:hover {
  border-color: var(--hpe-green);
  color: var(--hpe-green-dark);
}

button.link {
  background: transparent;
  color: var(--hpe-green-dark);
  padding: 4px 8px;
  border: none;
  text-decoration: underline;
  font-size: 0.9rem;
}

.quick-actions {
  margin-top: 6px;
}

.hidden {
  display: none !important;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 14px;
}

.progress {
  margin-bottom: 22px;
}

.progress-bar {
  height: 8px;
  background: #e9ecef;
  border-radius: 6px;
  overflow: hidden;
}

#progress-fill {
  height: 100%;
  background: var(--hpe-green);
  transition: width 0.25s;
}

#progress-text {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 6px 0 0;
}

#question-container .question {
  font-size: 1.12rem;
  font-weight: 600;
  margin-bottom: 8px;
}

#question-container .question-hint {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
}

#question-container .module-tag {
  display: inline-block;
  background: var(--hpe-green);
  color: white;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 12px;
}

#question-container .difficulty-tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 0.75rem;
  margin-left: 6px;
  background: #eef1f3;
  color: var(--muted);
}

.option {
  display: block;
  padding: 12px 16px;
  margin-bottom: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fbfcfd;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.option:hover {
  border-color: var(--hpe-green);
  background: #f1faf6;
}

.option input {
  margin-right: 10px;
  accent-color: var(--hpe-green);
}

.option.selected {
  border-color: var(--hpe-green);
  background: #e6f6f0;
}

.option.correct {
  border-color: var(--success);
  background: #e7f5e9;
}

.option.incorrect {
  border-color: var(--danger);
  background: #fae6e6;
}

.option.was-correct {
  border-color: var(--success);
  background: #f0faf2;
}

.quiz-controls {
  margin-top: 18px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.explanation {
  margin-top: 20px;
  padding: 14px 18px;
  border-left: 4px solid var(--hpe-green);
  background: #f1faf6;
  border-radius: 4px;
}

.explanation strong {
  display: block;
  margin-bottom: 6px;
}

.result-summary {
  display: flex;
  gap: 28px;
  margin: 22px 0;
  flex-wrap: wrap;
}

.result-stat {
  text-align: center;
  flex: 1 1 120px;
}

.result-stat .big {
  display: block;
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--hpe-green-dark);
}

.result-stat .small {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
}

#result-message {
  font-size: 1rem;
  background: #f1faf6;
  border-radius: 6px;
  padding: 12px 16px;
  border-left: 4px solid var(--hpe-green);
}

.review-item {
  border-top: 1px solid var(--border);
  padding: 16px 0;
}

.review-item:first-child {
  border-top: none;
}

.review-item .q-num {
  font-weight: 700;
  color: var(--hpe-green-dark);
}

.review-item .verdict {
  font-weight: 600;
}

.verdict.right { color: var(--success); }
.verdict.wrong { color: var(--danger); }

.review-item .small-explain {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.92rem;
}

.result-actions {
  margin-top: 18px;
  display: flex;
  gap: 10px;
}

footer {
  text-align: center;
  padding: 20px;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 600px) {
  header { padding: 12px 16px; }
  .brand h1 { font-size: 1rem; }
  main { padding: 0 12px; margin: 16px auto; }
  .card { padding: 18px; }
  .quiz-controls { flex-direction: column; }
  .quiz-controls button { width: 100%; }
}