:root {
  color-scheme: light;
  font-family: Arial, Helvetica, sans-serif;
  --bg: #f5f5f7;
  --text: #222;
  --muted: #4b5563;
  --card-bg: #ffffff;
  --card-border: #e5e7eb;
  --control-bg: #ffffff;
  --control-border: #d1d5db;
  --tab-border: #ccc;
  --tab-active: #2563eb;
  --secondary-bg: #f9fafb;
  --status: #374151;
  --history-border: #e5e7eb;
  --answer-correct-border: #16a34a;
  --answer-correct-bg: #ecfdf3;
  --answer-correct-text: #14532d;
  --answer-wrong-border: #dc2626;
  --answer-wrong-bg: #fef2f2;
  --answer-wrong-text: #7f1d1d;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1115;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --card-bg: #171a21;
  --card-border: #2a2f3a;
  --control-bg: #111827;
  --control-border: #374151;
  --tab-border: #4b5563;
  --tab-active: #60a5fa;
  --secondary-bg: #1f2937;
  --status: #cbd5e1;
  --history-border: #374151;
  --answer-correct-border: #22c55e;
  --answer-correct-bg: #14532d;
  --answer-correct-text: #dcfce7;
  --answer-wrong-border: #ef4444;
  --answer-wrong-bg: #7f1d1d;
  --answer-wrong-text: #fee2e2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

.container {
  max-width: 760px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.tabs {
  display: flex;
  gap: 0.5rem;
}

.tab,
button {
  border: 1px solid var(--tab-border);
  background: var(--control-bg);
  color: var(--text);
  border-radius: 8px;
  padding: 0.55rem 0.85rem;
  cursor: pointer;
}

.tab.active {
  border-color: var(--tab-active);
  color: var(--tab-active);
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 1rem;
}

.hidden {
  display: none;
}

.form {
  display: grid;
  gap: 0.6rem;
}

input,
select {
  border: 1px solid var(--control-border);
  background: var(--control-bg);
  color: var(--text);
  border-radius: 8px;
  padding: 0.6rem;
  font-size: 1rem;
}

.quiz-meta {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.answers {
  display: grid;
  gap: 0.6rem;
  margin-top: 1rem;
}

.answer-btn {
  text-align: left;
  width: 100%;
  padding: 0.75rem;
}

.answer-btn.correct {
  border-color: var(--answer-correct-border);
  background: var(--answer-correct-bg);
  color: var(--answer-correct-text);
}

.answer-btn.wrong {
  border-color: var(--answer-wrong-border);
  background: var(--answer-wrong-bg);
  color: var(--answer-wrong-text);
}

.quiz-footer {
  margin-top: 1rem;
  display: flex;
  gap: 0.5rem;
}

.secondary {
  background: var(--secondary-bg);
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.history-list {
  margin-top: 1rem;
  display: grid;
  gap: 0.75rem;
}

.history-filters {
  margin-top: 0.8rem;
  display: grid;
  grid-template-columns: 1fr 1fr auto auto;
  gap: 0.5rem;
}

@media (max-width: 700px) {
  .history-filters {
    grid-template-columns: 1fr;
  }
}

.history-item {
  border: 1px solid var(--history-border);
  border-radius: 8px;
  padding: 0.75rem;
}

.history-item h3 {
  margin: 0 0 0.3rem 0;
  font-size: 1rem;
}

.history-item p {
  margin: 0.2rem 0;
}

.status {
  min-height: 1.2rem;
  margin: 0.8rem 0 0;
  color: var(--status);
}