:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --bg: #f7f8fa;
  --card: #ffffff;
  --border: #e2e5ea;
  --text: #1f2430;
  --muted: #6b7280;
  --success: #15803d;
  --error: #b91c1c;
  --warning: #b45309;
}
* { box-sizing: border-box; }
body {
  font-family: -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 0;
}
.container { max-width: 1100px; margin: 0 auto; padding: 24px; }
header.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
header.topbar h1 { font-size: 18px; margin: 0; }
nav a {
  margin-left: 16px;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}
nav a.active, nav a:hover { color: var(--primary); }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}
.card h2 { font-size: 16px; margin-top: 0; }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; margin-top: 12px; }
input[type=text], input[type=number], input[type=date], input[type=email], select, textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
}
.checkbox-row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 6px; }
.checkbox-row label { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text); margin: 0; }
.checkbox-row input { width: auto; }
button, .btn {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 9px 16px;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  margin-top: 14px;
  margin-right: 8px;
  display: inline-block;
  text-decoration: none;
}
button:hover, .btn:hover { background: var(--primary-dark); }
button.secondary { background: #fff; color: var(--primary); border: 1px solid var(--primary); }
.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; font-size: 14px; }
.flash.success { background: #ecfdf3; color: var(--success); border: 1px solid #bbf7d0; }
.flash.error { background: #fef2f2; color: var(--error); border: 1px solid #fecaca; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; }
tr.day-start td { border-top: 2px solid var(--border); }
.warning-cell { color: var(--warning); font-size: 12px; }
.muted { color: var(--muted); font-size: 12px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
#pushResults, #inviteResults { margin-top: 14px; font-size: 13px; }
.tag { display: inline-block; background: #eef2ff; color: var(--primary); padding: 2px 8px; border-radius: 999px; font-size: 11px; }