* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background-color: #f5f5f5;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background-color: #111827;
    color: white;
}

.brand {
    font-weight: 600;
}

.user-email {
    margin-right: 1rem;
    font-size: 0.9rem;
}

.container {
    max-width: 640px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.card {
    background-color: white;
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.card h1 {
    margin-top: 0;
    margin-bottom: 0.5rem;
}

.button {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 999px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
}

.button.primary {
    background-color: #2563eb;
    color: white;
}

.button.secondary {
    background-color: #e5e7eb;
    color: #111827;
}

.button + .button {
    margin-left: 0.5rem;
}

.form-inline {
    margin-top: 1rem;
}

.messages {
    margin-bottom: 1rem;
}

.alert {
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.alert-success {
    background-color: #ecfdf3;
    color: #166534;
}

.alert-error {
    background-color: #fef2f2;
    color: #b91c1c;
}