:root {
  --bg: #edf2ff;
  --bg-soft: #f8faff;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --ok: #059669;
  --border: #dbe4ff;
  --shadow: 0 10px 30px rgba(37, 99, 235, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 0 0, #dbe9ff 0, var(--bg) 45%, #eaf0ff 100%);
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 20px 16px 28px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.title {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 1px;
  color: #1e40af;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}

.menu-group h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.menu-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

button {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.18s ease;
}

button:hover {
  transform: translateY(-1px);
  border-color: #bfd1ff;
}

button.primary {
  background: linear-gradient(135deg, var(--primary), #3b82f6);
  color: #fff;
  border-color: var(--primary);
}

button.primary:hover {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
}

button.danger {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 10px;
}

.row.space-between {
  justify-content: space-between;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  font-size: 15px;
  background: #fff;
  font-family: inherit;
  color: var(--text);
}

input[type="checkbox"] {
  width: auto;
  margin-right: 4px;
}

textarea {
  min-height: 110px;
  resize: vertical;
}

.small-input {
  width: 88px;
}

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

.question-title {
  font-size: 18px;
  margin: 6px 0 12px;
  line-height: 1.6;
  white-space: pre-wrap;
}

.answer {
  margin-top: 12px;
  padding: 12px 14px;
  border: 1px solid #bfdbfe;
  border-left: 4px solid #3b82f6;
  border-radius: 10px;
  background: linear-gradient(135deg, #eff6ff, #f8fbff);
  color: #111827;
  white-space: pre-wrap;
}

.answer-title {
  margin-bottom: 6px;
  font-size: 13px;
  font-weight: 700;
  color: #1e3a8a;
  letter-spacing: 0.5px;
}

.answer-content {
  font-size: 15px;
  line-height: 1.7;
}

.exam-wrap {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 12px;
}

.palette {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.palette button {
  padding: 8px 0;
  font-size: 13px;
}

.palette .done {
  background: #dcfce7;
  border-color: #86efac;
  color: #14532d;
}

.palette .current {
  border-color: var(--primary);
  box-shadow: inset 0 0 0 1px var(--primary);
}

.timer {
  font-size: 22px;
  font-weight: 700;
  color: #b91c1c;
}

.result {
  font-size: 20px;
  font-weight: 700;
  color: var(--ok);
}

.panel-title {
  margin: 0 0 8px;
}

.section-title {
  margin: 0;
}

.hidden {
  display: none !important;
}

@media (max-width: 800px) {
  .exam-wrap {
    grid-template-columns: 1fr;
  }

  .title {
    font-size: 22px;
  }

  .question-title {
    font-size: 16px;
  }
}