body {
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background: linear-gradient(135deg, #3e1f0f, #a97458);
            font-family: 'Segoe UI', sans-serif;
        }

        .login-card {
            width: 100%;
            max-width: 380px;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.3);
            padding: 2rem;
            animation: fadeIn 0.8s ease-in-out;
            color: #fff;
        }

        .login-card img {
            border-radius: 50%;
            background: #fff;
            padding: 8px;
        }

        .login-card h4 {
            font-weight: bold;
            color: #fff;
        }

        .form-label {
            font-weight: 600;
            color: #eee;
        }

        .form-control {
            background: rgba(255,255,255,0.2);
            border: none;
            color: #fff;
        }

        .form-control:focus {
            background: rgba(255,255,255,0.3);
            color: #fff;
            box-shadow: none;
            border: 1px solid #fff;
        }

        .input-group-text {
            background: rgba(255,255,255,0.2);
            border: none;
            color: #fff;
            cursor: pointer;
        }

        .btn-coffee {
            background: #fff;
            color: #3e1f0f;
            font-weight: bold;
            border-radius: 12px;
            padding: 0.6rem;
            transition: 0.3s;
        }

        .btn-coffee:hover {
            background: #f1f1f1;
            color: #2a140a;
        }

        .alert {
            border-radius: 12px;
            font-size: 0.9rem;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-20px); }
            to { opacity: 1; transform: translateY(0); }
        }