* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  background: #f0f2f5;
  color: #333;
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 12px 0;
}

header h1 { font-size: 22px; }

.token-row { display: flex; align-items: center; gap: 8px; }
.token-row input { width: 260px; }

.tabs {
  display: flex;
  gap: 4px;
  margin: 12px 0;
  border-bottom: 2px solid #d9d9d9;
}

.tab {
  border: none;
  background: transparent;
  padding: 10px 20px;
  font-size: 15px;
  cursor: pointer;
  color: #666;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
}

.tab.active { color: #1677ff; border-bottom-color: #1677ff; font-weight: 600; }

.panel { display: none; }
.panel.active { display: block; }

.card {
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.card h2 { font-size: 16px; margin-bottom: 12px; }

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

.row label { min-width: 70px; color: #666; font-size: 14px; }
.row .radio { min-width: auto; cursor: pointer; }

input, select {
  padding: 6px 10px;
  border: 1px solid #d9d9d9;
  border-radius: 6px;
  font-size: 14px;
  background: #fff;
}

input:focus, select:focus { outline: 2px solid #1677ff33; border-color: #1677ff; }

button {
  padding: 8px 16px;
  border-radius: 6px;
  border: 1px solid #d9d9d9;
  background: #fff;
  cursor: pointer;
  font-size: 14px;
}

button.primary { background: #1677ff; color: #fff; border-color: #1677ff; }
button.primary:disabled { background: #a0c4ff; cursor: not-allowed; }
button.ghost { color: #1677ff; }

pre {
  background: #f6f8fa;
  border-radius: 6px;
  padding: 10px;
  font-size: 12px;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.user-info { font-size: 14px; line-height: 1.8; color: #444; }

.q-item {
  border: 1px solid #eee;
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 10px;
}

.q-stem { font-size: 15px; margin-bottom: 8px; line-height: 1.6; }
.q-stem img, .opt img { vertical-align: middle; max-height: 44px; }

.opt {
  padding: 6px 10px;
  border-radius: 6px;
  margin-bottom: 4px;
  font-size: 14px;
  background: #fafafa;
}

.opt.correct {
  background: #f6ffed;
  border: 1px solid #95de64;
  color: #237804;
  font-weight: 600;
}

.opt .mark { color: #52c41a; font-weight: 700; }

.q-explain {
  margin-top: 8px;
  padding: 8px 10px;
  background: #fffbe6;
  border-radius: 6px;
  font-size: 13px;
  color: #874d00;
  line-height: 1.6;
}

.q-count { color: #999; font-size: 13px; margin-bottom: 8px; }

.levels { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.levels label {
  border: 1px solid #d9d9d9;
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 13px;
  cursor: pointer;
}
.levels label.on { background: #1677ff; color: #fff; border-color: #1677ff; }

.preview { background: #f6f8fa; border-radius: 6px; padding: 10px; font-size: 12px; margin-bottom: 10px; }

#up-result { margin-top: 10px; }

.batch { border: 1px solid #eee; border-radius: 6px; padding: 8px 10px; margin-bottom: 6px; font-size: 13px; }
.batch.ok { background: #f6ffed; }
.batch.fail { background: #fff2f0; }

.logout-link { color: #999; cursor: pointer; font-size: 13px; margin-left: 12px; }