* { box-sizing: border-box; }
body {
  font-family: -apple-system, Segoe UI, Roboto, sans-serif;
  margin: 0;
  background: #f5f6f8;
  color: #1a1a1a;
}
.topnav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 24px;
  background: #1f2937;
  color: #fff;
}
.topnav a { color: #cbd5e1; text-decoration: none; margin-left: 12px; }
.topnav a:hover { color: #fff; }
main { padding: 24px; max-width: 960px; margin: 0 auto; }
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.auth-form {
  background: #fff;
  padding: 32px;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
  width: 320px;
}
.auth-form label { display: block; margin-bottom: 12px; font-size: 14px; }
.auth-form input {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
  border: 1px solid #ccc;
  border-radius: 4px;
}
.auth-form button, form button {
  background: #2563eb;
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
}
.error { color: #b91c1c; font-size: 14px; }
table { border-collapse: collapse; width: 100%; margin-bottom: 24px; }
th, td { text-align: left; padding: 8px 12px; border-bottom: 1px solid #e5e7eb; }