:root[data-theme="dark"] {
  --bg: #0b0f14;
  --card: #121926;
  --text: #e6edf3;
  --muted: #9aa4af;
  --border: #243042;
  --good: #2ea043;
  --bad: #f85149;
  --accent: #58a6ff;
}

:root[data-theme="light"] {
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1c1c1c;
  --muted: #6a737d;
  --border: #d0d7de;
  --good: #2da44e;
  --bad: #cf222e;
  --accent: #0969da;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(32px);
  border-bottom: 1px solid var(--border);
  padding: 12px 16px;
  z-index: 10;
}

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 16px;
}

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

.pill {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
}

button {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
}

button:hover {
  border-color: var(--accent);
}

input[type="search"] {
  flex: 1;
  min-width: 220px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  color: var(--text);
  outline: none;
}

input[type="search"]:focus {
  border-color: var(--accent);
}

.q-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px 14px 10px;
  margin: 12px 0;
}

.q-head {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: flex-start;
}

.q-title {
  margin: 0;
  font-size: 16px;
  line-height: 1.35;
}

.q-meta {
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
  padding-top: 2px;
}

.options {
  margin-top: 10px;
  display: grid;
  gap: 8px;
}

.opt {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  transition: border-color 0.15s ease;
}

.opt input {
  margin-top: 2px;
  transform: scale(1.1);
}

.opt .text {
  flex: 1;
}

.opt .mark {
  font-weight: 700;
  width: 18px;
  text-align: center;
  opacity: 0.9;
}

.opt.correct {
  border-color: rgba(46, 160, 67, 0.8);
  box-shadow: 0 0 0 1px rgba(46, 160, 67, 0.18) inset;
}

.opt.wrong {
  border-color: rgba(248, 81, 73, 0.85);
  box-shadow: 0 0 0 1px rgba(248, 81, 73, 0.18) inset;
}

.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 10px;
  align-items: center;
}

.desc {
  margin-top: 10px;
  border-left: 3px solid var(--border);
  padding: 10px 12px;
  color: var(--muted);
  white-space: pre-wrap;
  display: none;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
}

.desc.open {
  display: block;
}

.score {
  color: var(--muted);
  font-size: 13px;
}

.small {
  font-size: 12px;
  color: var(--muted);
}