:root {
  --bg: #f7f8fa;
  --card-bg: #ffffff;
  --border: #d7dbe0;
  --text: #1f2430;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  padding: 16px 24px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
}

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

main { max-width: 860px; margin: 0 auto; padding: 20px; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 16px;
}

label { display: block; margin: 10px 0 4px; font-size: 14px; color: var(--muted); }

input[type="text"], input:not([type]) {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 15px;
  width: 100%;
  max-width: 320px;
}

.radio-row { display: flex; gap: 18px; margin: 10px 0; }
.radio-row label { display: flex; align-items: center; gap: 6px; margin: 0; color: var(--text); }

button {
  cursor: pointer;
  font-size: 15px;
  border-radius: 6px;
  border: 1px solid transparent;
  padding: 9px 18px;
}

button:disabled { cursor: not-allowed; opacity: 0.5; }

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover:not(:disabled) { background: var(--primary-dark); }
.btn-danger { background: var(--danger); color: white; }

.endpoint-item { display: flex; align-items: center; gap: 8px; padding: 6px 0; font-size: 15px; color: var(--text); }

.warning-banner {
  padding: 10px 14px;
  border-radius: 6px;
  background: #fef3c7;
  color: #92400e;
  margin-bottom: 14px;
  font-size: 14px;
}

.error-banner {
  padding: 10px 14px;
  border-radius: 6px;
  background: #fee2e2;
  color: #991b1b;
  margin: 10px 0;
  font-size: 14px;
}

.banner {
  padding: 10px 14px;
  border-radius: 6px;
  background: #eef2ff;
  color: #3730a3;
  margin-bottom: 14px;
  font-size: 14px;
}

.hidden { display: none; }

.fine-print { color: var(--muted); font-size: 13px; }

.run-header { display: flex; align-items: center; gap: 16px; justify-content: space-between; }

.readouts { display: flex; gap: 14px; margin: 14px 0; flex-wrap: wrap; }

.readout {
  flex: 1;
  min-width: 120px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  text-align: center;
}

.readout-value { display: block; font-size: 26px; font-weight: 600; }
.readout-label { display: block; font-size: 12px; color: var(--muted); margin-top: 2px; }

canvas#live-chart { width: 100%; background: white; border: 1px solid var(--border); border-radius: 8px; }

table { width: 100%; border-collapse: collapse; margin: 10px 0; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border); font-size: 14px; }
th { color: var(--muted); font-weight: 600; }