:root {
  --primary: #2563eb;
  --surface: #ffffff;
  --background: #f3f4f6;
  --text: #1f2937;
  --border: #e5e7eb;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--background);
  color: var(--text);
  margin: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.navbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand {
  font-weight: bold;
  font-size: 1.25rem;
  color: var(--primary);
  text-decoration: none;
}
.nav-links a {
  margin-left: 1.5rem;
  text-decoration: none;
  color: var(--text);
}
.nav-links a:hover {
  color: var(--primary);
}

.container {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
  flex: 1;
}

.auth-box {
  background: var(--surface);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  max-width: 400px;
  width: 100%;
  margin: 3rem auto;
}

.auth-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.form-group {
  margin-bottom: 1rem;
}
label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}
input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  box-sizing: border-box;
}
input:focus {
  outline: 2px solid var(--primary);
  border-color: transparent;
}

.btn {
  display: block;
  width: 100%;
  padding: 0.75rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
}
.btn:hover {
  background-color: #1d4ed8;
}

.footer {
  text-align: center;
  padding: 1.5rem;
  color: #6b7280;
  font-size: 0.875rem;
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: 4px;
  margin-bottom: 1rem;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.alert-error {
  background-color: #fee2e2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

.alert-success {
  background-color: #dcfce7;
  color: #16a34a;
  border: 1px solid #bbf7d0;
}

.alert-warning {
  background-color: #fef3c7;
  color: #d97706;
  border: 1px solid #fde68a;
}

.alert-info {
  background-color: #dbeafe;
  color: #2563eb;
  border: 1px solid #bfdbfe;
}