:root {
  --bg: #0f1220;
  --card: #1a1f36;
  --ink: #eef1ff;
  --muted: #9aa3c7;
  --go: #2ecc71;
  --stop: #e74c3c;
  --line: #2a2f4a;
  --accent: #6c8cff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #232a4d, var(--bg));
  color: var(--ink);
  padding: 24px;
}
.card {
  width: 100%;
  max-width: 560px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
}
h1 { margin: 0 0 4px; font-size: 1.6rem; }
h2 { margin: 0 0 8px; font-size: 1.1rem; }
.sub { margin: 0 0 20px; color: var(--muted); }
.status {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px;
  background: #141830; margin-bottom: 18px;
}
.dot { width: 12px; height: 12px; border-radius: 50%; background: var(--muted); }
.dot.up { background: var(--go); box-shadow: 0 0 12px var(--go); }
.dot.down { background: var(--stop); }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  appearance: none; border: 1px solid var(--line); border-radius: 10px;
  padding: 11px 16px; font-size: .98rem; font-weight: 600; cursor: pointer;
  color: var(--ink); background: #232a4d; transition: transform .05s, filter .15s;
}
.btn:hover { filter: brightness(1.12); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-go { background: var(--go); color: #052012; border-color: transparent; }
.btn-stop { background: var(--stop); color: #2a0906; border-color: transparent; }
.btn-ghost { background: transparent; }
.btn.small { padding: 7px 12px; font-size: .85rem; }
.sign {
  margin-top: 20px; padding: 18px; border: 1px dashed var(--accent);
  border-radius: 12px; background: #131834;
}
.sign.hidden { display: none; }
.cmd {
  background: #0b0e1c; border: 1px solid var(--line); border-radius: 8px;
  padding: 12px; overflow-x: auto; font-size: .82rem; white-space: pre-wrap; word-break: break-all;
}
.lbl { color: var(--muted); margin: 14px 0 6px; }
textarea {
  width: 100%; background: #0b0e1c; color: var(--ink); border: 1px solid var(--line);
  border-radius: 8px; padding: 12px; font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: .82rem; resize: vertical;
}
.msg { min-height: 1.4em; margin-top: 16px; }
.msg.ok { color: var(--go); }
.msg.err { color: var(--stop); }
.msg.info { color: var(--muted); }
.help { margin-top: 22px; color: var(--muted); font-size: .9rem; }
.help code { background: #0b0e1c; padding: 2px 6px; border-radius: 5px; }
a { color: var(--accent); }