:root {
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --border: #d7dae0;
  --accent: #2f6fed;
  --error: #d64545;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 40px 16px;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "PingFang TC", "Microsoft JhengHei", sans-serif;
  display: flex;
  justify-content: center;
}

.card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 32px;
  max-width: 560px;
  width: 100%;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

h1 {
  font-size: 20px;
  margin: 0 0 24px;
}

fieldset {
  border: none;
  padding: 0;
  margin: 0 0 24px;
}

legend {
  font-weight: 600;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 12px;
  padding: 0;
}

.field {
  margin-bottom: 16px;
}

label {
  display: block;
  font-size: 14px;
  margin-bottom: 6px;
}

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

input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: #fff;
  color: var(--text);
  font-family: inherit;
  resize: vertical;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.hint {
  margin: 6px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.field.error label {
  color: var(--error);
}

.field.error .req {
  color: var(--error);
}

.field.error input,
.field.error select,
.field.error textarea {
  border-color: var(--error);
}

button[type="submit"] {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

button[type="submit"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.result {
  margin-top: 16px;
  padding: 12px;
  border-radius: 8px;
  font-size: 14px;
}

.result.success {
  background: #e6f4ea;
  color: #1e7c3c;
}

.result.failure {
  background: #fbe8e8;
  color: var(--error);
}

.warning {
  background: #fff4e5;
  color: #92600a;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 20px;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

.req-block {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 16px;
  overflow: hidden;
}

.req-block-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: #f8f9fb;
  cursor: pointer;
  user-select: none;
}

.req-toggle {
  border: none;
  background: none;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
  padding: 0;
  width: 16px;
}

.req-label-group {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 14px;
  flex: 1;
}

.req-type-select {
  width: auto;
  padding: 2px 6px;
  font-size: 12px;
  font-weight: 400;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
}

.req-delete {
  border: none;
  background: none;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 6px;
}

.req-delete:hover {
  color: var(--error);
  background: #fbe8e8;
}

.req-block-body {
  padding: 16px;
}

.req-block.collapsed .req-block-body {
  display: none;
}

.req-collapsed-actions {
  display: none;
  gap: 8px;
  padding: 0 14px 12px;
}

.req-block.collapsed .req-collapsed-actions {
  display: flex;
}

.req-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.req-actions button,
.req-collapsed-actions button {
  flex: 1;
  padding: 8px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: #fff;
  color: var(--accent);
  font-size: 13px;
  cursor: pointer;
}

.req-actions button:hover,
.req-collapsed-actions button:hover {
  background: #eef3ff;
}