*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: system-ui, sans-serif;
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem;
  color: #1a1a1a;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid #e0e0e0;
  margin-bottom: 2rem;
}

.brand { font-weight: bold; text-decoration: none; color: inherit; }
.nav-links { display: flex; gap: 1rem; align-items: center; }
.nav-user { color: #555; font-size: 0.9rem; }

.btn-link {
  background: none;
  border: none;
  cursor: pointer;
  color: #0066cc;
  font-size: inherit;
  padding: 0;
  text-decoration: underline;
}

table { width: 100%; border-collapse: collapse; }
th, td { padding: 0.5rem 0.75rem; text-align: left; border-bottom: 1px solid #e0e0e0; }
th { font-weight: 600; }

.form-narrow { max-width: 360px; }
.form-narrow label { display: block; margin-top: 1rem; font-weight: 600; }
.form-narrow input, .form-narrow select {
  display: block; width: 100%; padding: 0.4rem 0.6rem;
  margin-top: 0.25rem; border: 1px solid #ccc; border-radius: 4px;
}
.form-narrow button, .btn-primary {
  margin-top: 1rem; padding: 0.5rem 1.5rem;
  background: #0066cc; color: white;
  border: none; border-radius: 4px; cursor: pointer;
}
.error { color: #c00; background: #fff0f0; padding: 0.5rem; border-radius: 4px; margin-bottom: 1rem; }