:root {
  --bg: #0e151c;
  --panel: #16202a;
  --fg: #e8eef4;
  --muted: #8fa0b3;
  --acc: #3d8bfd;
  --ok: #3ecf8e;
  --err: #ff6b6b;
  --line: rgba(255,255,255,.08);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "Trebuchet MS", sans-serif;
  background:
    radial-gradient(1200px 600px at 10% -10%, #1e3a5f 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #243b2e 0%, transparent 50%),
    var(--bg);
  color: var(--fg);
  min-height: 100vh;
}
.top {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1rem 1.25rem; border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; letter-spacing: .02em; font-size: 1.1rem; }
.chip { font-size: .85rem; color: var(--muted); }
.panel { max-width: 720px; margin: 0 auto; padding: 1.25rem; }
h1 { margin: 0 0 .75rem; font-size: 1.6rem; }
.muted { color: var(--muted); }
.tabs { display: flex; gap: .5rem; margin: 1rem 0; }
.tab, button {
  background: var(--acc); color: #fff; border: 0; border-radius: 8px;
  padding: .65rem 1rem; cursor: pointer; font-weight: 600;
}
.tab { background: transparent; border: 1px solid var(--line); color: var(--fg); }
.tab.active { border-color: var(--acc); color: var(--acc); }
button.ghost { background: transparent; border: 1px solid var(--line); color: var(--fg); }
.form { display: grid; gap: .75rem; }
label { display: grid; gap: .35rem; font-size: .9rem; color: var(--muted); }
input, textarea, select {
  background: var(--panel); border: 1px solid var(--line); color: var(--fg);
  border-radius: 8px; padding: .65rem .75rem; font: inherit;
}
.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 12px; padding: 1rem; margin: 1rem 0;
}
.actions { display: flex; flex-wrap: wrap; gap: .5rem; margin: 1rem 0; }
.error { color: var(--err); }
.ok { color: var(--ok); }
.hidden { display: none !important; }
pre, code {
  white-space: pre-wrap; word-break: break-all;
  background: #0b1016; padding: .75rem; border-radius: 8px; display: block;
}
.list { display: grid; gap: .75rem; }
.tg-box { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--line); }
@media (max-width: 600px) {
  .actions button { flex: 1 1 auto; }
}