:root {
    --bg-gradient-start: #4e73df;
    --bg-gradient-end: #1cc88a;
    --card-bg: #ffffff;
    --primary-color: #4e73df;
    --primary-hover: #2e59d9;
    --text-muted: #6c757d;
    --input-border: #dee2e6;
}

body {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.login-card {
    background: var(--card-bg);
    border: none;
    border-radius: 1rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.login-card .card-body {
    padding: 2.5rem;
}

.form-control {
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    border: 1px solid var(--input-border);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(78, 115, 223, 0.15);
}

.btn-primary {
    background-color: var(--primary-color);
    border: none;
    border-radius: 0.75rem;
    padding: 0.75rem;
    font-weight: 600;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.login-title {
    font-weight: 700;
}

.login-subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
}

@media (max-width: 576px) {
    .login-card .card-body {
        padding: 1.75rem;
    }
}