:root {
  --bg: #f3f5f7;
  --panel: #ffffff;
  --line: #d8dde4;
  --text: #1f2937;
  --muted: #516071;
  --accent: #1f6feb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top right, #dbe9ff, var(--bg) 45%);
}

.container {
  max-width: 960px;
  margin: 24px auto;
  padding: 0 16px 24px;
  display: grid;
  gap: 16px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
}

h1,
h2 {
  margin: 0 0 8px;
}

.muted {
  margin: 0 0 16px;
  color: var(--muted);
}

.form-grid {
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  gap: 6px;
  font-size: 14px;
}

input,
select,
button {
  font: inherit;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
}

button {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  background: #0d1117;
  color: #d4e6ff;
  border-radius: 8px;
  padding: 12px;
  min-height: 72px;
}