:root {
            --sidebar-bg: #0f172a;
            --card-border-radius: 12px;
        }

        body {
            font-family: 'Inter', sans-serif;
            background-color: #ffffff;
            color: #334155;
            margin: 0;
        }

        /* Full-Width Layout Container */
        .app-container {
            width: 100%;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: #ffffff;
            padding: 1.5rem;
        }

        /* Login Card Styling */
        .login-card {
            width: 100%;
            max-width: 400px;
            border-radius: var(--card-border-radius);
            border: 1px solid #e2e8f0;
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
            background-color: #ffffff;
        }

        .brand-logo {
            background-color: var(--sidebar-bg);
            width: 48px;
            height: 48px;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto;
        }

        .form-control:focus {
            border-color: #2563eb;
            box-shadow: 0 0 0 0.25rem rgba(37, 99, 235, 0.15);
        }

        .btn-primary {
            background-color: #2563eb;
            border-color: #2563eb;
            padding: 0.6rem;
            font-weight: 500;
        }

        .btn-primary:hover {
            background-color: #1d4ed8;
            border-color: #1d4ed8;
        }