:root {
  --bg: #0e1116;
  --fg: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --card: #161b22;
  --border: #30363d;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  display: flex;
  justify-content: center;
}

main {
  width: 100%;
  max-width: 720px;
  padding: 48px 24px;
}

h1 {
  margin: 0 0 4px;
  font-size: 28px;
  letter-spacing: -0.01em;
}

.subtitle {
  margin: 0 0 24px;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0d1117;
  color: var(--fg);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
}

.hint {
  margin: 6px 0 16px;
  font-size: 12px;
  color: var(--muted);
}

.hint code {
  background: #0d1117;
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.actions input { flex: 1 1 160px; }

button {
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--accent);
  color: #0d1117;
  font-weight: 600;
  cursor: pointer;
}

button:hover { filter: brightness(1.1); }

pre {
  background: #0d1117;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  font-size: 13px;
  max-height: 360px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

footer {
  margin-top: 24px;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}