* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f5f7fb;
  color: #172033;
}

.page {
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 48px 16px;
}

.card {
  width: 100%;
  max-width: 980px;
  background: #ffffff;
  border: 1px solid #d8deea;
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 20px 45px rgba(23, 32, 51, 0.08);
}

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

.header p {
  margin: 0 0 24px;
  color: #65708a;
  line-height: 1.5;
}

.status-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: #4b5875;
  font-size: 14px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: #aab3c5;
}

.dot.ok {
  background: #16a34a;
}

.dot.fail {
  background: #dc2626;
}

label {
  display: block;
  margin: 18px 0 8px;
  font-weight: 700;
}

textarea {
  width: 100%;
  resize: vertical;
  border: 1px solid #cbd5e1;
  border-radius: 12px;
  padding: 14px;
  font: inherit;
  line-height: 1.5;
  outline: none;
}

textarea:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.controls {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}

button {
  border: 0;
  border-radius: 12px;
  padding: 12px 18px;
  cursor: pointer;
  font-weight: 700;
}

#sendButton {
  background: #2563eb;
  color: white;
}

#sendButton:disabled {
  background: #9db7f4;
  cursor: not-allowed;
}

#clearButton {
  background: #eef2f7;
  color: #26324a;
}

.meta {
  margin-top: 12px;
  color: #65708a;
  font-size: 14px;
}

.response {
  min-height: 260px;
  white-space: pre-wrap;
  overflow-x: auto;
  background: #0f172a;
  color: #e5e7eb;
  padding: 18px;
  border-radius: 12px;
  line-height: 1.55;
}