body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    color: #212529;
}

input[type="text"],
input[type="email"],
input[type="password"],
textarea,
select {
    border-radius: 0.375rem;
    border: 1px solid #ced4da;
    padding: 0.5rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input:focus,
textarea:focus,
select:focus {
    border-color: #80bdff;
    box-shadow: 0 0 0 0.2rem rgba(0,123,255,.25);
    outline: none;
}

.card-custom {
    border: none;
    border-radius: 0.75rem;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

h1, h2, h3, h4, h5 {
    font-weight: 600;
}

.form-label {
    color: #212529;
}

.form-control-lg {
    border-radius: 0.5rem;
    border: 1.5px solid #ced4da;
    padding: 0.75rem 1rem;
    font-size: 1.125rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control-lg:focus {
    border-color: #0056b3;
    box-shadow: 0 0 8px rgba(0, 86, 179, 0.25);
    outline: none;
}

.form-control-lg::placeholder {
    color: #6c757d;
    opacity: 1;
}

.btn-primary {
    background-color: #0056b3;
    border-color: #004085;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: #004085;
    border-color: #002752;
    box-shadow: 0 0 12px rgba(0, 64, 133, 0.6);
}

@media (max-width: 575.98px) {
    main {
        padding: 1rem;
    }
}