:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --panel-2: #f2f4f7;
  --border: #e5e8ec;
  --text: #1f2329;
  --text-dim: #7c8494;
  --primary: #3b82f6;
  --primary-hover: #2f6fe0;
  --green: #16a34a;
  --mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.6;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #fff;
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--primary);
}

.brand h1 {
  font-size: 17px;
  margin: 0;
  font-weight: 600;
}

.badge {
  font-size: 12px;
  padding: 2px 9px;
  border-radius: 20px;
  background: var(--panel-2);
  color: var(--text-dim);
  border: 1px solid var(--border);
}

.btn {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}

.btn:hover { border-color: var(--primary); color: var(--primary); }

.btn:disabled { opacity: 0.55; cursor: not-allowed; }

.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); color: #fff; }

.layout {
  max-width: 900px;
  margin: 20px auto;
  padding: 0 20px;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.toolbar input[type="text"] {
  flex: 1;
  min-width: 220px;
  padding: 9px 12px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.toolbar input[type="text"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

.toolbar select {
  padding: 9px 10px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 14px;
  outline: none;
  color: var(--text);
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-dim);
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
}

.toggle input { accent-color: var(--primary); cursor: pointer; }

.count {
  font-size: 13px;
  color: var(--text-dim);
  white-space: nowrap;
}

.list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.03);
}

.card-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.card-no {
  flex: none;
  min-width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--panel-2);
  border: 1px solid var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--text-dim);
  font-family: var(--mono);
}

.card-type {
  flex: none;
  font-size: 11px;
  padding: 2px 9px;
  border-radius: 12px;
  background: #eff6ff;
  color: var(--primary);
}

.card-question {
  font-size: 15px;
  margin: 0;
  line-height: 1.7;
  color: var(--text);
}

.card-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 20px;
  margin-top: 12px;
  font-size: 14px;
  color: var(--text-dim);
}

.card-options .opt {
  font-family: var(--mono);
  padding: 4px 10px;
  border-radius: 7px;
  border: 1px solid transparent;
}

.card-options .opt.opt-answer {
  background: #ecfdf3;
  border-color: #bbf7d0;
  color: var(--green);
  font-weight: 600;
}

.empty {
  text-align: center;
  color: var(--text-dim);
  padding: 50px 0;
  font-size: 14px;
}

.footer {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 20px 40px;
  text-align: center;
  font-size: 13px;
  color: var(--text-dim);
}

.pager {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.pager button {
  min-width: 34px;
  padding: 6px 11px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.12s;
}

.pager button:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }

.pager button:disabled { opacity: 0.4; cursor: not-allowed; }

.pager button.current {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  font-weight: 600;
}

.pager .pager-info {
  font-size: 12px;
  color: var(--text-dim);
  margin: 0 6px;
}

@media (max-width: 640px) {
  .card-options { grid-template-columns: 1fr; }
}