:root {
  --bg: #f6f7f9; --card: #ffffff; --text: #1d2330; --muted: #667085; --line: #e4e7ec;
  --primary: #1f6feb; --primary-text: #ffffff; --ok: #12805c; --warn: #b54708; --error: #b42318;
  --error-bg: #fef3f2; --ok-bg: #ecfdf3;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111418; --card: #1a1f26; --text: #e6e8eb; --muted: #98a2b3; --line: #2b323c;
    --primary: #4c8dff; --ok: #4ade80; --warn: #fbbf24; --error: #f87171; --error-bg: #2a1616; --ok-bg: #12261b; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Tahoma, "Noto Sans Arabic", sans-serif; }
.top { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px;
  background: var(--card); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; }
.top-actions { display: flex; gap: 8px; align-items: center; }
.inline { display: inline; margin: 0; }
.wrap { max-width: 920px; margin: 0 auto; padding: 16px; }
.hello { font-size: 18px; margin: 4px 0 16px; }
.grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 720px) { .grid { grid-template-columns: 2fr 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; margin-bottom: 16px; }
.card.narrow { max-width: 420px; margin: 40px auto; }
.card h1, .card h2 { margin-top: 0; }
.card h2 { font-size: 18px; }
.join-card.state-open { border-color: var(--primary); }
.big { font-size: 18px; font-weight: 600; }
.ok { color: var(--ok); font-weight: 600; }
.warn { color: var(--warn); font-weight: 600; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.form label { display: block; margin-bottom: 12px; font-weight: 600; }
.form input { display: block; width: 100%; margin-top: 4px; padding: 10px 12px; font-size: 16px;
  border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--text); }
select { padding: 6px 8px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--text); }
.btn { border: 0; border-radius: 8px; padding: 10px 18px; font-size: 16px; cursor: pointer; }
.btn-primary { background: var(--primary); color: var(--primary-text); font-weight: 600; }
.btn-big { padding: 14px 28px; font-size: 18px; margin: 8px 0; }
.btn-link { background: none; color: var(--primary); padding: 6px; }
.notice { border-radius: 8px; padding: 12px 14px; margin-bottom: 16px; }
.notice-error { background: var(--error-bg); color: var(--error); }
.notice-success { background: var(--ok-bg); color: var(--ok); }
.notice p { margin: 4px 0; }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: start; padding: 8px 6px; border-bottom: 1px solid var(--line); }
.table th { color: var(--muted); font-weight: 600; font-size: 14px; }
.group h3 { margin: 12px 0 4px; font-size: 16px; }
.names { margin: 0; padding-inline-start: 20px; }