:root {
  --bg: #0f1419;
  --panel: #1a222c;
  --text: #e7eef7;
  --muted: #9aa8b8;
  --accent: #3d9cf0;
  --ok: #3ecf8e;
  --err: #f07178;
  --border: #2a3542;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  background: radial-gradient(1200px 600px at 10% -10%, #1b2a3a, var(--bg));
  color: var(--text);
  min-height: 100vh;
  padding: 1.5rem 2rem 2rem;
}
h1 { font-weight: 600; letter-spacing: -0.02em; margin: 0 0 0.25rem; }
h2 { font-size: 1.05rem; margin: 0 0 0.75rem; }
.sub { color: var(--muted); margin-bottom: 1rem; }
nav.shell {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 1rem 0 1.25rem;
  padding: 0.5rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
}
nav.shell button {
  margin: 0;
  background: transparent;
  color: var(--muted);
  border: 1px solid transparent;
}
nav.shell button.active {
  color: var(--text);
  border-color: var(--accent);
  background: #121820;
}
nav.shell button:disabled { opacity: 0.35; }
#main {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  max-width: 960px;
}
label { display: block; font-size: 0.85rem; color: var(--muted); margin: 0.75rem 0 0.35rem; }
input, textarea {
  width: 100%;
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #121820;
  color: var(--text);
}
button {
  margin-top: 0.85rem;
  margin-right: 0.5rem;
  background: var(--accent);
  color: #041018;
  border: 0;
  border-radius: 8px;
  padding: 0.55rem 0.9rem;
  font-weight: 600;
  cursor: pointer;
}
button.secondary { background: #2a3542; color: var(--text); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
.repeater-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-top: 0.4rem;
}
.repeater-row input { flex: 1; margin: 0; }
.repeater-row button { margin: 0; padding: 0.45rem 0.65rem; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; margin-top: 0.75rem; }
th, td { text-align: left; padding: 0.45rem 0.35rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 500; }
pre {
  margin-top: 1rem;
  background: #0c1015;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  overflow: auto;
  max-height: 28vh;
  font-size: 0.8rem;
  white-space: pre-wrap;
}
.ok { color: var(--ok); }
.err { color: var(--err); }
.hidden { display: none !important; }
code { font-family: "IBM Plex Mono", ui-monospace, monospace; }