:root {
  color-scheme: dark;
  --bg: #0b1220;
  --card: #121a2b;
  --line: #243049;
  --text: #e8eefc;
  --muted: #9aa8c7;
  --accent: #3ee0c5;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", ui-sans-serif, system-ui, sans-serif;
  background:
    radial-gradient(1200px 500px at 10% -10%, #16324d 0%, transparent 55%),
    var(--bg);
  color: var(--text);
}
header, main { max-width: 860px; margin: 0 auto; padding: 2rem 1.25rem 0; }
header { display: flex; justify-content: space-between; gap: 1rem; align-items: end; }
.eyebrow { margin: 0; letter-spacing: 0.16em; text-transform: uppercase; font-size: 0.7rem; color: var(--accent); }
h1 { margin: 0.2rem 0 0; font-size: 2.2rem; letter-spacing: -0.04em; }
.status { color: var(--muted); font-size: 0.9rem; }
.lede { color: var(--muted); line-height: 1.5; }
nav { display: flex; gap: 0.5rem; margin: 1.5rem 0 1rem; }
nav button, .primary {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  cursor: pointer;
}
nav button.active, .primary { background: var(--accent); color: #04251f; font-weight: 650; }
.panel { display: none; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 1.1rem; }
.panel.active { display: grid; gap: 0.8rem; }
label { display: grid; gap: 0.35rem; color: var(--muted); font-size: 0.9rem; }
input, textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: #0c1424;
  color: var(--text);
  border-radius: 10px;
  padding: 0.7rem 0.8rem;
  font: inherit;
}
.check { display: flex; align-items: center; gap: 0.5rem; }
.out {
  margin: 1rem 0 3rem;
  background: #070c16;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1rem;
  min-height: 12rem;
  white-space: pre-wrap;
  overflow: auto;
}