* { box-sizing: border-box; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  margin: 0;
  background: #f5f6fa;
  color: #1c2330;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 24px;
  background: #111827;
  color: #fff;
}
header h1 { margin: 0; font-size: 1.2rem; }
.header-right { display: flex; align-items: center; gap: 12px; }
main { max-width: 760px; margin: 24px auto; padding: 0 16px; }
.card { background: #fff; border-radius: 10px; padding: 20px; margin-bottom: 16px; box-shadow: 0 1px 3px rgba(0,0,0,.1); }
.card h2 { margin-top: 0; font-size: 1rem; }
.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tab { background: #e2e8f0; color: #0f172a; }
.tab.active { background: #2563eb; color: #fff; }
label { display: block; margin-bottom: 10px; font-size: .9rem; }
input { width: 100%; padding: 9px; border: 1px solid #cbd5e1; border-radius: 6px; margin-top: 4px; }
button { cursor: pointer; border: 0; border-radius: 6px; padding: 9px 14px; background: #2563eb; color: #fff; font-size: .9rem; }
button.danger { background: #dc2626; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px; border-bottom: 1px solid #eee; vertical-align: middle; }
td button { margin-right: 6px; padding: 5px 10px; font-size: .8rem; }
.msg { color: #b91c1c; min-height: 1.2em; font-size: .85rem; margin: 6px 0; }