:root {
  color-scheme: dark;
  --bg: #0f172a;
  --panel: #111827;
  --panel-soft: #1f2937;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #38bdf8;
  --border: #334155;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #172554, var(--bg) 42%);
  color: var(--text);
}
.shell { max-width: 1180px; margin: 0 auto; padding: 32px; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.eyebrow { color: var(--accent); text-transform: uppercase; letter-spacing: .12em; font-size: 12px; margin: 0 0 6px; }
h1, h2 { margin: 0 0 16px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { background: rgba(17, 24, 39, .86); border: 1px solid var(--border); border-radius: 18px; padding: 20px; box-shadow: 0 20px 60px rgba(0,0,0,.22); }
.span-2 { grid-column: span 2; }
.stack { display: flex; flex-direction: column; gap: 10px; }
.row { display: grid; grid-template-columns: 1fr 1fr 140px; gap: 12px; }
label { color: var(--muted); font-size: 13px; }
input, textarea, select { width: 100%; background: var(--panel-soft); color: var(--text); border: 1px solid var(--border); border-radius: 12px; padding: 12px; font: inherit; }
button, .pill { background: var(--accent); color: #082f49; border: 0; border-radius: 999px; padding: 10px 16px; font-weight: 700; text-decoration: none; cursor: pointer; }
button.secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.list { padding-left: 18px; }
.list li { margin-bottom: 14px; }
.list span { color: var(--muted); }
.output { white-space: pre-wrap; background: #020617; border: 1px solid var(--border); border-radius: 14px; padding: 18px; overflow-x: auto; }
.back { color: var(--accent); display: inline-block; margin-bottom: 16px; }
@media (max-width: 900px) { .grid, .row { grid-template-columns: 1fr; } .span-2 { grid-column: auto; } .shell { padding: 18px; } }