* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  background: #f5f7fb;
  color: #1f2937;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.header h1 {
  margin: 0 0 8px;
  font-size: 28px;
}

.subtitle {
  margin: 0 0 24px;
  color: #6b7280;
}

.panel {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.panel label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
}

.row {
  display: flex;
  gap: 12px;
}

input[type="text"] {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 15px;
  outline: none;
}

input[type="text"]:focus {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

button {
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  background: #2563eb;
  color: #ffffff;
  font-size: 15px;
  cursor: pointer;
  transition: background 0.2s;
}

button:hover:not(:disabled) {
  background: #1d4ed8;
}

button:disabled {
  background: #9ca3af;
  cursor: not-allowed;
}

button.secondary {
  background: #ffffff;
  color: #2563eb;
  border: 1px solid #2563eb;
}

button.secondary:hover:not(:disabled) {
  background: #eff6ff;
}

.status {
  margin: 12px 0 0;
  min-height: 20px;
  color: #6b7280;
  font-size: 14px;
}

.status.error {
  color: #dc2626;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.panel-head h2 {
  margin: 0;
  font-size: 18px;
}

.output {
  margin: 0;
  padding: 16px;
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 520px;
  overflow: auto;
}