:root { --bg: #0f1221; --fg: #e9ecf5; --accent: #5b8cff; --muted: #9aa3bd; }
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
  padding: 24px;
}
header h1 { margin: 0 0 4px; font-size: 22px; }
nav, footer { color: var(--muted); font-size: 14px; }
a { color: var(--accent); }
code { background: rgba(255,255,255,0.08); padding: 1px 5px; border-radius: 4px; }
main { margin: 20px 0; max-width: 760px; }
form { display: grid; gap: 10px; max-width: 360px; }
label { display: grid; gap: 4px; font-size: 14px; }
input { padding: 8px; border-radius: 6px; border: 1px solid #333a57; background: #171a2e; color: var(--fg); }
button { padding: 9px 14px; border: 0; border-radius: 6px; background: var(--accent); color: #fff; cursor: pointer; }
ul#board { padding-left: 18px; }
li.msg { margin: 6px 0; }