:root {
  --bg: #0e1116;
  --card: #171b22;
  --text: #e6ecf1;
  --muted: #8892a0;
  --accent: #4c8bf5;
  --danger: #f75c68;
  --border: #262d38;
  --radius: 10px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  line-height: 1.55;
  display: flex;
  justify-content: center;
  padding: 5vh 20px;
}
main#app {
  width: 100%;
  max-width: 560px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 32px 40px;
}
.brand { margin-bottom: 28px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.brand-mark { font-weight: 700; letter-spacing: 0.5px; font-size: 20px; }
.brand-sub  { color: var(--muted); font-size: 13px; margin-top: 4px; }
.view { animation: fade 200ms ease-out; }
.view.hidden { display: none; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
h1 { font-size: 22px; margin: 0 0 12px; }
p { margin: 8px 0 14px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.preview {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin: 16px 0 20px;
  display: grid;
  gap: 8px;
}
.preview label {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 2px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.preview code {
  background: transparent;
  color: var(--text);
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 13px;
}
button.primary {
  background: var(--accent);
  color: white;
  border: 0;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  margin: 12px 0 4px;
}
button.primary:hover { filter: brightness(1.1); }
button.primary:disabled { opacity: 0.55; cursor: default; }
ol { padding-left: 20px; }
li { margin: 6px 0; }
code {
  background: rgba(255,255,255,0.04);
  padding: 2px 5px;
  border-radius: 4px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 13px;
}