* {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
        }

        body {
            background-color: #f3f4f6;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }

        .login-container {
            background-color: #ffffff;
            padding: 40px;
            border-radius: 12px;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
            width: 100%;
            max-width: 400px;
        }

        .login-container h2 {
            text-align: center;
            color: #1f2937;
            margin-bottom: 30px;
            font-weight: 600;
        }

        .input-group {
            margin-bottom: 20px;
        }

        .input-group label {
            display: block;
            margin-bottom: 8px;
            color: #4b5563;
            font-size: 14px;
        }

        .input-group input {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid #d1d5db;
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.3s, box-shadow 0.3s;
        }

        .input-group input:focus {
            outline: none;
            border-color: #3b82f6;
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
        }

        .btn-submit {
            width: 100%;
            background-color: #3b82f6;
            color: white;
            padding: 14px;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.3s;
        }

        .btn-submit:hover {
            background-color: #2563eb;
        }

        .btn-submit:disabled {
            background-color: #9ca3af;
            cursor: not-allowed;
        }

        .error-message {
            display: none;
            background-color: #fef2f2;
            color: #b91c1c;
            padding: 12px;
            border-radius: 8px;
            border: 1px solid #f87171;
            margin-bottom: 20px;
            font-size: 14px;
            text-align: center;
        }