body {
  font-family: -apple-system, Segoe UI, Arial, sans-serif;
  background: #fff;
  color: #111;
  margin: 0;
}
.topbar {
  background: #111;
  color: #fff;
  padding: 16px 24px;
}
.muted { color: #888; font-size: 0.85em; }
.card {
  max-width: 420px;
  margin: 60px auto;
  padding: 24px;
  border: 1px solid #eee;
  border-radius: 8px;
}
.tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.tab {
  flex: 1;
  padding: 10px;
  border: 1px solid #ddd;
  background: #f5f5f5;
  cursor: pointer;
  border-radius: 4px;
}
.tab.active { background: #111; color: #fff; }
label { display: block; margin: 12px 0 4px; font-size: 0.9em; }
input {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  box-sizing: border-box;
}
button[type="submit"], #btn-logout {
  width: 100%;
  margin-top: 20px;
  padding: 12px;
  background: #111;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
.link {
  background: none;
  border: none;
  text-decoration: underline;
  cursor: pointer;
  margin-top: 10px;
}
.msg {
  padding: 10px;
  margin-bottom: 16px;
  border-radius: 4px;
  font-size: 0.9em;
}
.msg.error { background: #fdecea; color: #b3261e; }
.msg.success { background: #eaf7ea; color: #1e6b1e; }