:root {
  --bg: #f4f5f8;
  --card: #ffffff;
  --text: #1a1d26;
  --muted: #5c6370;
  --accent: #4a3cfa;
  --border: #e2e5ec;
  --ok: #0d7a4f;
  --err: #b42318;
  --radius: 12px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 10% -10%, #dfe4ff 0%, transparent 55%),
    radial-gradient(900px 400px at 100% 0%, #ece8ff 0%, transparent 50%),
    var(--bg);
  min-height: 100vh;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px 18px 64px;
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 0.35rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.1rem;
  margin: 0 0 0.75rem;
}

h3 {
  font-size: 0.95rem;
  margin: 1rem 0 0.4rem;
}

.muted,
.help {
  color: var(--muted);
  font-size: 0.9rem;
}

.mono,
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85em;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.15rem;
  margin: 1rem 0;
  box-shadow: 0 8px 24px rgba(26, 29, 38, 0.04);
}

label {
  display: block;
  margin: 0.65rem 0;
  font-size: 0.9rem;
  font-weight: 600;
}

input,
select {
  display: block;
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
  font-weight: 400;
  background: #fff;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin: 1rem 0;
  padding: 0.75rem 1rem 1rem;
}

legend {
  padding: 0 0.35rem;
  font-weight: 600;
}

.btn {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.6rem 1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.btn.secondary {
  background: #fff;
  color: var(--accent);
  border: 1px solid var(--accent);
  margin-left: 0.5rem;
}

pre {
  overflow: auto;
  background: #0f1220;
  color: #e8eaf2;
  padding: 0.85rem;
  border-radius: 8px;
  font-size: 0.78rem;
  line-height: 1.45;
}

.ok {
  color: var(--ok);
  font-weight: 600;
}

.error {
  color: var(--err);
  font-weight: 600;
}

ul {
  padding-left: 1.2rem;
  color: var(--muted);
}