:root {
  --bg: #0b0f12;
  --panel: #0f1419;
  --text: #cbd5e1;
  --muted: #94a3b8;
  --accent: #535396; /* #39ff14; */ /* terminal green */
  --link: #7dd3fc;
  --danger: #ef4444;
  --border: #1f2937;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

.brand {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px;
  background: linear-gradient(180deg, #0f1720 0%, #0c1116 100%);
  border-bottom: 1px solid var(--border);
  color: var(--accent);
  letter-spacing: 0.06em;
}

.topnav {
  background: #0c1218;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.topnav .burger {
  display: none;
  background: transparent; color: var(--text);
  border: 1px solid var(--border); padding: 6px 10px; margin: 8px;
}
.topnav ul {
  display: flex; gap: 10px; list-style: none;
  margin: 0; padding: 8px 12px; overflow-x: auto;
}
.topnav li a {
  display: inline-flex; gap: 6px; align-items:center;
  padding: 6px 10px; border: 1px solid var(--border);
  color: var(--link); text-decoration: none; background: var(--panel);
}
.topnav li.active a { border-color: var(--accent); color: var(--accent); }

.container { max-width: 980px; margin: 14px auto; padding: 0 12px; }
.notice { text-align:center; color: var(--muted); margin: 6px 0 12px; }

.sysbox {
  background: #0b1218; border: 1px dashed var(--border);
  padding: 10px; color: var(--muted); margin: 10px 0 16px;
}
.sysbox code { color: var(--text); }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 12px;
  margin: 12px 0;
  display: block;
  max-width: 100%;        /* never overflow container */
  white-space: pre;
  overflow-x: auto;       /* allows horizontal scroll */
  overflow-y: hidden;     /* no vertical scroll bar unless you want it */
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  padding: 16px 12px; text-align: center; margin-top: 24px;
}
.footer a { color: var(--link); }
.tiny { margin-top: 6px; font-size: 12px; color: #6b7280; }

/* Mobile tweaks */
@media (max-width: 760px) {
  .topnav .burger { display: inline-block; }
  .topnav ul { display: none; flex-direction: column; padding: 8px; }
  .topnav ul.open { display: flex; }
  .container { max-width: 100%; }
  .brand { font-size: 16px; }
}