:root {
  --bg: #0d1117;
  --panel: #161b22;
  --accent: #58a6ff;
  --danger: #ff6b6b;
  --success: #7ee787;
  --text: #f0f6fc;
  --muted: #8b949e;
  --border: #30363d;
}

* {
  box-sizing: border-box;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

h1, h2, h3 {
  margin: 0 0 8px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 14px;
}

input, select, button {
  width: 100%;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0b0f16;
  color: var(--text);
  font-size: 16px;
}

button {
  cursor: pointer;
  background: var(--accent);
  color: #0c1320;
  font-weight: 700;
  transition: transform 0.05s ease, box-shadow 0.2s ease;
  box-shadow: 0 8px 16px rgba(88, 166, 255, 0.25);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #0f1622;
  color: var(--muted);
  font-size: 13px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.answers {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.answer-btn {
  text-align: left;
  background: #0f1622;
  border: 1px solid var(--border);
  color: var(--text);
}

.answer-btn.correct {
  border-color: var(--success);
  color: var(--success);
}

.answer-btn.wrong {
  border-color: var(--danger);
  color: var(--danger);
}

.status-line {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.meter {
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: #0b0f16;
  border: 1px solid var(--border);
  overflow: hidden;
}

.meter > div {
  height: 100%;
  background: var(--accent);
  transition: width 0.2s linear;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th, .table td {
  border-bottom: 1px solid var(--border);
  padding: 8px;
  text-align: left;
  color: var(--text);
}

.table th {
  color: var(--muted);
}

.tag {
  padding: 6px 8px;
  background: #0f1622;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  color: var(--muted);
}

.stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.stats .card {
  flex: 1;
  min-width: 180px;
}

.highlight {
  color: var(--accent);
}

.notice {
  font-size: 14px;
  color: var(--muted);
}